Bump google.golang.org/grpc from 1.53.0 to 1.56.3

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.53.0 to 1.56.3.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](https://github.com/grpc/grpc-go/compare/v1.53.0...v1.56.3)

---
updated-dependencies:
- dependency-name: google.golang.org/grpc
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

go.mod

@@ -27,7 +27,7 @@ require (
 	github.com/sirupsen/logrus v1.8.1
 	github.com/spf13/cobra v1.6.1
 	golang.org/x/crypto v0.14.0
-	golang.org/x/oauth2 v0.6.0
+	golang.org/x/oauth2 v0.7.0
 	google.golang.org/api v0.114.0
 	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c
 	gopkg.in/yaml.v2 v2.4.0
@@ -35,9 +35,9 @@ require (
 
 require (
 	cloud.google.com/go v0.110.0 // indirect
-	cloud.google.com/go/compute v1.18.0 // indirect
+	cloud.google.com/go/compute v1.19.1 // indirect
 	cloud.google.com/go/compute/metadata v0.2.3 // indirect
-	cloud.google.com/go/iam v0.12.0 // indirect
+	cloud.google.com/go/iam v0.13.0 // indirect
 	github.com/Azure/azure-sdk-for-go/sdk/internal v1.3.0 // indirect
 	github.com/AzureAD/microsoft-authentication-library-for-go v1.0.0 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
@@ -49,7 +49,7 @@ require (
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/golang-jwt/jwt/v4 v4.5.0 // indirect
 	github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e // indirect
-	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
 	github.com/google/go-cmp v0.5.9 // indirect
 	github.com/google/uuid v1.3.0 // indirect
 	github.com/googleapis/enterprise-certificate-proxy v0.2.3 // indirect
@@ -77,7 +77,7 @@ require (
 	golang.org/x/text v0.13.0 // indirect
 	golang.org/x/xerrors v0.0.0-20220907171357-04be3eba64a2 // indirect
 	google.golang.org/appengine v1.6.7 // indirect
-	google.golang.org/genproto v0.0.0-20230320184635-7606e756e683 // indirect
+	google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1 // indirect
-	google.golang.org/grpc v1.53.0 // indirect
+	google.golang.org/grpc v1.56.3 // indirect
-	google.golang.org/protobuf v1.29.1 // indirect
+	google.golang.org/protobuf v1.30.0 // indirect
 )

go.sum

@@ -21,14 +21,14 @@ cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvf
 cloud.google.com/go/bigquery v1.5.0/go.mod h1:snEHRnqQbz117VIFhE8bmtwIDY80NLUZUMb4Nv6dBIg=
 cloud.google.com/go/bigquery v1.7.0/go.mod h1://okPTzCYNXSlb24MZs83e2Do+h+VXtc4gLoIoXIAPc=
 cloud.google.com/go/bigquery v1.8.0/go.mod h1:J5hqkt3O0uAFnINi6JXValWIb1v0goeZM77hZzJN/fQ=
-cloud.google.com/go/compute v1.18.0 h1:FEigFqoDbys2cvFkZ9Fjq4gnHBP55anJ0yQyau2f9oY=
+cloud.google.com/go/compute v1.19.1 h1:am86mquDUgjGNWxiGn+5PGLbmgiWXlE/yNWpIpNvuXY=
-cloud.google.com/go/compute v1.18.0/go.mod h1:1X7yHxec2Ga+Ss6jPyjxRxpu2uu7PLgsOVXvgU0yacs=
+cloud.google.com/go/compute v1.19.1/go.mod h1:6ylj3a05WF8leseCdIf77NK0g1ey+nj5IKd5/kvShxE=
 cloud.google.com/go/compute/metadata v0.2.3 h1:mg4jlk7mCAj6xXp9UJ4fjI9VUI5rubuGBW5aJ7UnBMY=
 cloud.google.com/go/compute/metadata v0.2.3/go.mod h1:VAV5nSsACxMJvgaAuX6Pk2AawlZn8kiOGuCv6gTkwuA=
 cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
 cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk=
-cloud.google.com/go/iam v0.12.0 h1:DRtTY29b75ciH6Ov1PHb4/iat2CLCvrOm40Q0a6DFpE=
+cloud.google.com/go/iam v0.13.0 h1:+CmB+K0J/33d0zSQ9SlFWUeCCEn5XJA0ZMZ3pHE9u8k=
-cloud.google.com/go/iam v0.12.0/go.mod h1:knyHGviacl11zrtZUoDuYpDgLjvr28sLQaG0YB2GYAY=
+cloud.google.com/go/iam v0.13.0/go.mod h1:ljOg+rcNfzZ5d6f1nAUJ8ZIxOaZUVoS14bKCtaLZ/D0=
 cloud.google.com/go/longrunning v0.4.1 h1:v+yFJOfKC3yZdY6ZUI933pIYdhyhV8S3NpWrXWmg7jM=
 cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
 cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw=
@@ -156,8 +156,9 @@ github.com/golang/protobuf v1.4.1/go.mod h1:U8fpvMrcmy5pZrNK1lt4xCsGvpyWQ/VVv6QD
 github.com/golang/protobuf v1.4.2/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
 github.com/golang/protobuf v1.4.3/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
 github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
-github.com/golang/protobuf v1.5.2 h1:ROPKBNFfQgOUMifHyP+KYbvpjbdoFNs+aK7DXlji0Tw=
 github.com/golang/protobuf v1.5.2/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
+github.com/golang/protobuf v1.5.3 h1:KhyjKVUg7Usr/dYsdSqoFveMYd5ko72D+zANwlG1mmg=
+github.com/golang/protobuf v1.5.3/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
 github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
 github.com/google/btree v1.0.0/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
 github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
@@ -414,8 +415,8 @@ golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45/go.mod h1:gOpvHmFTYa4Iltr
 golang.org/x/oauth2 v0.0.0-20191202225959-858c2ad4c8b6/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20210514164344-f6687ab2804c/go.mod h1:KelEdhl1UZF7XfJ4dDtk6s++YSgaE7mD/BuKKDLBl4A=
-golang.org/x/oauth2 v0.6.0 h1:Lh8GPgSKBfWSwFvtuWOfeI3aAAnbXTSutYxJiOJFgIw=
+golang.org/x/oauth2 v0.7.0 h1:qe6s0zUXlPX80/dITx3440hWZ7GwMwgDDyrSGTPJG/g=
-golang.org/x/oauth2 v0.6.0/go.mod h1:ycmewcwgD4Rpr3eZJLSB4Kyyljb3qDh40vJ8STE5HKw=
+golang.org/x/oauth2 v0.7.0/go.mod h1:hPLQkd9LyjfXTiRohC/41GhcFqxisoUQ99sCUOHO9x4=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
@@ -591,8 +592,8 @@ google.golang.org/genproto v0.0.0-20200618031413-b414f8b61790/go.mod h1:jDfRM7Fc
 google.golang.org/genproto v0.0.0-20200729003335-053ba62fc06f/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20200804131852-c06518451d9c/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20200825200019-8632dd797987/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
-google.golang.org/genproto v0.0.0-20230320184635-7606e756e683 h1:khxVcsk/FhnzxMKOyD+TDGwjbEOpcPuIpmafPGFmhMA=
+google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1 h1:KpwkzHKEF7B9Zxg18WzOa7djJ+Ha5DzthMyZYQfEn2A=
-google.golang.org/genproto v0.0.0-20230320184635-7606e756e683/go.mod h1:NWraEVixdDnqcqQ30jipen1STv2r/n24Wb7twVTGR4s=
+google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1/go.mod h1:nKE/iIaLqn2bQwXBg8f1g2Ylh6r5MN5CmZvuzZCgsCU=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
 google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
@@ -606,8 +607,8 @@ google.golang.org/grpc v1.29.1/go.mod h1:itym6AZVZYACWQqET3MqgPpjcuV5QH3BxFS3Iji
 google.golang.org/grpc v1.30.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
 google.golang.org/grpc v1.31.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
 google.golang.org/grpc v1.33.2/go.mod h1:JMHMWHQWaTccqQQlmk3MJZS+GWXOdAesneDmEnv2fbc=
-google.golang.org/grpc v1.53.0 h1:LAv2ds7cmFV/XTS3XG1NneeENYrXGmorPxsBbptIjNc=
+google.golang.org/grpc v1.56.3 h1:8I4C0Yq1EjstUzUJzpcRVbuYA2mODtEmpWiQoN/b2nc=
-google.golang.org/grpc v1.53.0/go.mod h1:OnIrk0ipVdj4N5d9IUoFUx72/VlD7+jUsHwZgwSMQpw=
+google.golang.org/grpc v1.56.3/go.mod h1:I9bI3vqKfayGqPUAwGdOSu7kt6oIJLixfffKrpXqQ9s=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
@@ -620,8 +621,8 @@ google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGj
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-google.golang.org/protobuf v1.29.1 h1:7QBf+IK2gx70Ap/hDsOmam3GE0v9HicjfEdAxE62UoM=
+google.golang.org/protobuf v1.30.0 h1:kPPoIgf3TsEvrm0PFe15JQ+570QVxYzEvvHqChK+cng=
-google.golang.org/protobuf v1.29.1/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
+google.golang.org/protobuf v1.30.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=

vendor/cloud.google.com/go/compute/internal/version.go

@@ -15,4 +15,4 @@
 package internal
 
 // Version is the current tagged release of the library.
-const Version = "1.18.0"
+const Version = "1.19.1"

vendor/cloud.google.com/go/iam/CHANGES.md

@@ -1,5 +1,12 @@
 # Changes
 
+## [0.13.0](https://github.com/googleapis/google-cloud-go/compare/iam/v0.12.0...iam/v0.13.0) (2023-03-15)
+
+
+### Features
+
+* **iam:** Update iam and longrunning deps ([91a1f78](https://github.com/googleapis/google-cloud-go/commit/91a1f784a109da70f63b96414bba8a9b4254cddd))
+
 ## [0.12.0](https://github.com/googleapis/google-cloud-go/compare/iam/v0.11.0...iam/v0.12.0) (2023-02-17)
 
 

vendor/cloud.google.com/go/iam/apiv1/iampb/iam_policy.pb.go

@@ -15,7 +15,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.26.0
-// 	protoc        v3.21.12
+// 	protoc        v3.21.9
 // source: google/iam/v1/iam_policy.proto
 
 package iampb

vendor/cloud.google.com/go/iam/apiv1/iampb/options.pb.go

@@ -15,7 +15,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.26.0
-// 	protoc        v3.21.12
+// 	protoc        v3.21.9
 // source: google/iam/v1/options.proto
 
 package iampb

vendor/cloud.google.com/go/iam/apiv1/iampb/policy.pb.go

@@ -15,7 +15,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.26.0
-// 	protoc        v3.21.12
+// 	protoc        v3.21.9
 // source: google/iam/v1/policy.proto
 
 package iampb

vendor/github.com/golang/protobuf/jsonpb/decode.go

@@ -386,8 +386,14 @@ func (u *Unmarshaler) unmarshalMessage(m protoreflect.Message, in []byte) error
 }
 
 func isSingularWellKnownValue(fd protoreflect.FieldDescriptor) bool {
+	if fd.Cardinality() == protoreflect.Repeated {
+		return false
+	}
 	if md := fd.Message(); md != nil {
-		return md.FullName() == "google.protobuf.Value" && fd.Cardinality() != protoreflect.Repeated
+		return md.FullName() == "google.protobuf.Value"
+	}
+	if ed := fd.Enum(); ed != nil {
+		return ed.FullName() == "google.protobuf.NullValue"
 	}
 	return false
 }

vendor/golang.org/x/oauth2/README.md

@@ -19,7 +19,7 @@ See pkg.go.dev for further documentation and examples.
 * [pkg.go.dev/golang.org/x/oauth2](https://pkg.go.dev/golang.org/x/oauth2)
 * [pkg.go.dev/golang.org/x/oauth2/google](https://pkg.go.dev/golang.org/x/oauth2/google)
 
-## Policy for new packages
+## Policy for new endpoints
 
 We no longer accept new provider-specific packages in this repo if all
 they do is add a single endpoint variable. If you just want to add a
@@ -29,8 +29,12 @@ package.
 
 ## Report Issues / Send Patches
 
-This repository uses Gerrit for code changes. To learn how to submit changes to
-this repository, see https://golang.org/doc/contribute.html.
-
 The main issue tracker for the oauth2 repository is located at
 https://github.com/golang/oauth2/issues.
+
+This repository uses Gerrit for code changes. To learn how to submit changes to
+this repository, see https://golang.org/doc/contribute.html. In particular:
+
+* Excluding trivial changes, all contributions should be connected to an existing issue.
+* API changes must go through the [change proposal process](https://go.dev/s/proposal-process) before they can be accepted.
+* The code owners are listed at [dev.golang.org/owners](https://dev.golang.org/owners#:~:text=x/oauth2).

vendor/golang.org/x/oauth2/google/default.go

@@ -13,12 +13,15 @@ import (
 	"os"
 	"path/filepath"
 	"runtime"
+	"time"
 
 	"cloud.google.com/go/compute/metadata"
 	"golang.org/x/oauth2"
 	"golang.org/x/oauth2/authhandler"
 )
 
+const adcSetupURL = "https://cloud.google.com/docs/authentication/external/set-up-adc"
+
 // Credentials holds Google credentials, including "Application Default Credentials".
 // For more details, see:
 // https://developers.google.com/accounts/docs/application-default-credentials
@@ -66,6 +69,14 @@ type CredentialsParams struct {
 	// The OAuth2 TokenURL default override. This value overrides the default TokenURL,
 	// unless explicitly specified by the credentials config file. Optional.
 	TokenURL string
+
+	// EarlyTokenRefresh is the amount of time before a token expires that a new
+	// token will be preemptively fetched. If unset the default value is 10
+	// seconds.
+	//
+	// Note: This option is currently only respected when using credentials
+	// fetched from the GCE metadata server.
+	EarlyTokenRefresh time.Duration
 }
 
 func (params CredentialsParams) deepCopy() CredentialsParams {
@@ -153,13 +164,12 @@ func FindDefaultCredentialsWithParams(ctx context.Context, params CredentialsPar
 		id, _ := metadata.ProjectID()
 		return &Credentials{
 			ProjectID:   id,
-			TokenSource: ComputeTokenSource("", params.Scopes...),
+			TokenSource: computeTokenSource("", params.EarlyTokenRefresh, params.Scopes...),
 		}, nil
 	}
 
 	// None are found; return helpful error.
-	const url = "https://developers.google.com/accounts/docs/application-default-credentials"
+	return nil, fmt.Errorf("google: could not find default credentials. See %v for more information", adcSetupURL)
-	return nil, fmt.Errorf("google: could not find default credentials. See %v for more information.", url)
 }
 
 // FindDefaultCredentials invokes FindDefaultCredentialsWithParams with the specified scopes.

vendor/golang.org/x/oauth2/google/doc.go

@@ -26,7 +26,7 @@
 //
 // Using workload identity federation, your application can access Google Cloud
 // resources from Amazon Web Services (AWS), Microsoft Azure or any identity
-// provider that supports OpenID Connect (OIDC).
+// provider that supports OpenID Connect (OIDC) or SAML 2.0.
 // Traditionally, applications running outside Google Cloud have used service
 // account keys to access Google Cloud resources. Using identity federation,
 // you can allow your workload to impersonate a service account.
@@ -36,26 +36,70 @@
 // Follow the detailed instructions on how to configure Workload Identity Federation
 // in various platforms:
 //
-//	Amazon Web Services (AWS): https://cloud.google.com/iam/docs/access-resources-aws
+//	Amazon Web Services (AWS): https://cloud.google.com/iam/docs/workload-identity-federation-with-other-clouds#aws
-//	Microsoft Azure: https://cloud.google.com/iam/docs/access-resources-azure
+//	Microsoft Azure: https://cloud.google.com/iam/docs/workload-identity-federation-with-other-clouds#azure
-//	OIDC identity provider: https://cloud.google.com/iam/docs/access-resources-oidc
+//	OIDC identity provider: https://cloud.google.com/iam/docs/workload-identity-federation-with-other-providers#oidc
+//	SAML 2.0 identity provider: https://cloud.google.com/iam/docs/workload-identity-federation-with-other-providers#saml
 //
 // For OIDC and SAML providers, the library can retrieve tokens in three ways:
 // from a local file location (file-sourced credentials), from a server
 // (URL-sourced credentials), or from a local executable (executable-sourced
 // credentials).
 // For file-sourced credentials, a background process needs to be continuously
-// refreshing the file location with a new OIDC token prior to expiration.
+// refreshing the file location with a new OIDC/SAML token prior to expiration.
 // For tokens with one hour lifetimes, the token needs to be updated in the file
 // every hour. The token can be stored directly as plain text or in JSON format.
 // For URL-sourced credentials, a local server needs to host a GET endpoint to
-// return the OIDC token. The response can be in plain text or JSON.
+// return the OIDC/SAML token. The response can be in plain text or JSON.
 // Additional required request headers can also be specified.
 // For executable-sourced credentials, an application needs to be available to
-// output the OIDC token and other information in a JSON format.
+// output the OIDC/SAML token and other information in a JSON format.
 // For more information on how these work (and how to implement
 // executable-sourced credentials), please check out:
-// https://cloud.google.com/iam/docs/using-workload-identity-federation#oidc
+// https://cloud.google.com/iam/docs/workload-identity-federation-with-other-providers#create_a_credential_configuration
+//
+// Note that this library does not perform any validation on the token_url, token_info_url,
+// or service_account_impersonation_url fields of the credential configuration.
+// It is not recommended to use a credential configuration that you did not generate with
+// the gcloud CLI unless you verify that the URL fields point to a googleapis.com domain.
+//
+// # Workforce Identity Federation
+//
+// Workforce identity federation lets you use an external identity provider (IdP) to
+// authenticate and authorize a workforce—a group of users, such as employees, partners,
+// and contractors—using IAM, so that the users can access Google Cloud services.
+// Workforce identity federation extends Google Cloud's identity capabilities to support
+// syncless, attribute-based single sign on.
+//
+// With workforce identity federation, your workforce can access Google Cloud resources
+// using an external identity provider (IdP) that supports OpenID Connect (OIDC) or
+// SAML 2.0 such as Azure Active Directory (Azure AD), Active Directory Federation
+// Services (AD FS), Okta, and others.
+//
+// Follow the detailed instructions on how to configure Workload Identity Federation
+// in various platforms:
+//
+//	Azure AD: https://cloud.google.com/iam/docs/workforce-sign-in-azure-ad
+//	Okta: https://cloud.google.com/iam/docs/workforce-sign-in-okta
+//	OIDC identity provider: https://cloud.google.com/iam/docs/configuring-workforce-identity-federation#oidc
+//	SAML 2.0 identity provider: https://cloud.google.com/iam/docs/configuring-workforce-identity-federation#saml
+//
+// For workforce identity federation, the library can retrieve tokens in three ways:
+// from a local file location (file-sourced credentials), from a server
+// (URL-sourced credentials), or from a local executable (executable-sourced
+// credentials).
+// For file-sourced credentials, a background process needs to be continuously
+// refreshing the file location with a new OIDC/SAML token prior to expiration.
+// For tokens with one hour lifetimes, the token needs to be updated in the file
+// every hour. The token can be stored directly as plain text or in JSON format.
+// For URL-sourced credentials, a local server needs to host a GET endpoint to
+// return the OIDC/SAML token. The response can be in plain text or JSON.
+// Additional required request headers can also be specified.
+// For executable-sourced credentials, an application needs to be available to
+// output the OIDC/SAML token and other information in a JSON format.
+// For more information on how these work (and how to implement
+// executable-sourced credentials), please check out:
+// https://cloud.google.com/iam/docs/workforce-obtaining-short-lived-credentials#generate_a_configuration_file_for_non-interactive_sign-in
 //
 // Note that this library does not perform any validation on the token_url, token_info_url,
 // or service_account_impersonation_url fields of the credential configuration.
@@ -86,5 +130,4 @@
 // same as the one obtained from the oauth2.Config returned from ConfigFromJSON or
 // JWTConfigFromJSON, but the Credentials may contain additional information
 // that is useful is some circumstances.
-//
 package google // import "golang.org/x/oauth2/google"

vendor/golang.org/x/oauth2/google/google.go

@@ -231,7 +231,11 @@ func (f *credentialsFile) tokenSource(ctx context.Context, params CredentialsPar
 // Further information about retrieving access tokens from the GCE metadata
 // server can be found at https://cloud.google.com/compute/docs/authentication.
 func ComputeTokenSource(account string, scope ...string) oauth2.TokenSource {
-	return oauth2.ReuseTokenSource(nil, computeSource{account: account, scopes: scope})
+	return computeTokenSource(account, 0, scope...)
+}
+
+func computeTokenSource(account string, earlyExpiry time.Duration, scope ...string) oauth2.TokenSource {
+	return oauth2.ReuseTokenSourceWithExpiry(nil, computeSource{account: account, scopes: scope}, earlyExpiry)
 }
 
 type computeSource struct {

vendor/golang.org/x/oauth2/oauth2.go

@@ -16,6 +16,7 @@ import (
 	"net/url"
 	"strings"
 	"sync"
+	"time"
 
 	"golang.org/x/oauth2/internal"
 )
@@ -140,7 +141,7 @@ func SetAuthURLParam(key, value string) AuthCodeOption {
 //
 // State is a token to protect the user from CSRF attacks. You must
 // always provide a non-empty string and validate that it matches the
-// the state query parameter on your redirect callback.
+// state query parameter on your redirect callback.
 // See http://tools.ietf.org/html/rfc6749#section-10.12 for more info.
 //
 // Opts may include AccessTypeOnline or AccessTypeOffline, as well
@@ -290,6 +291,8 @@ type reuseTokenSource struct {
 
 	mu sync.Mutex // guards t
 	t  *Token
+
+	expiryDelta time.Duration
 }
 
 // Token returns the current token if it's still valid, else will
@@ -305,6 +308,7 @@ func (s *reuseTokenSource) Token() (*Token, error) {
 	if err != nil {
 		return nil, err
 	}
+	t.expiryDelta = s.expiryDelta
 	s.t = t
 	return t, nil
 }
@@ -379,3 +383,30 @@ func ReuseTokenSource(t *Token, src TokenSource) TokenSource {
 		new: src,
 	}
 }
+
+// ReuseTokenSource returns a TokenSource that acts in the same manner as the
+// TokenSource returned by ReuseTokenSource, except the expiry buffer is
+// configurable. The expiration time of a token is calculated as
+// t.Expiry.Add(-earlyExpiry).
+func ReuseTokenSourceWithExpiry(t *Token, src TokenSource, earlyExpiry time.Duration) TokenSource {
+	// Don't wrap a reuseTokenSource in itself. That would work,
+	// but cause an unnecessary number of mutex operations.
+	// Just build the equivalent one.
+	if rt, ok := src.(*reuseTokenSource); ok {
+		if t == nil {
+			// Just use it directly, but set the expiryDelta to earlyExpiry,
+			// so the behavior matches what the user expects.
+			rt.expiryDelta = earlyExpiry
+			return rt
+		}
+		src = rt.new
+	}
+	if t != nil {
+		t.expiryDelta = earlyExpiry
+	}
+	return &reuseTokenSource{
+		t:           t,
+		new:         src,
+		expiryDelta: earlyExpiry,
+	}
+}

vendor/golang.org/x/oauth2/token.go

@@ -16,10 +16,10 @@ import (
 	"golang.org/x/oauth2/internal"
 )
 
-// expiryDelta determines how earlier a token should be considered
+// defaultExpiryDelta determines how earlier a token should be considered
 // expired than its actual expiration time. It is used to avoid late
 // expirations due to client-server time mismatches.
-const expiryDelta = 10 * time.Second
+const defaultExpiryDelta = 10 * time.Second
 
 // Token represents the credentials used to authorize
 // the requests to access protected resources on the OAuth 2.0
@@ -52,6 +52,11 @@ type Token struct {
 	// raw optionally contains extra metadata from the server
 	// when updating a token.
 	raw interface{}
+
+	// expiryDelta is used to calculate when a token is considered
+	// expired, by subtracting from Expiry. If zero, defaultExpiryDelta
+	// is used.
+	expiryDelta time.Duration
 }
 
 // Type returns t.TokenType if non-empty, else "Bearer".
@@ -127,6 +132,11 @@ func (t *Token) expired() bool {
 	if t.Expiry.IsZero() {
 		return false
 	}
+
+	expiryDelta := defaultExpiryDelta
+	if t.expiryDelta != 0 {
+		expiryDelta = t.expiryDelta
+	}
 	return t.Expiry.Round(0).Add(-expiryDelta).Before(timeNow())
 }
 

vendor/google.golang.org/genproto/googleapis/api/annotations/client.pb.go

@@ -795,6 +795,31 @@ type DotnetSettings struct {
 
 	// Some settings.
 	Common *CommonLanguageSettings `protobuf:"bytes,1,opt,name=common,proto3" json:"common,omitempty"`
+	// Map from original service names to renamed versions.
+	// This is used when the default generated types
+	// would cause a naming conflict. (Neither name is
+	// fully-qualified.)
+	// Example: Subscriber to SubscriberServiceApi.
+	RenamedServices map[string]string `protobuf:"bytes,2,rep,name=renamed_services,json=renamedServices,proto3" json:"renamed_services,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	// Map from full resource types to the effective short name
+	// for the resource. This is used when otherwise resource
+	// named from different services would cause naming collisions.
+	// Example entry:
+	// "datalabeling.googleapis.com/Dataset": "DataLabelingDataset"
+	RenamedResources map[string]string `protobuf:"bytes,3,rep,name=renamed_resources,json=renamedResources,proto3" json:"renamed_resources,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	// List of full resource types to ignore during generation.
+	// This is typically used for API-specific Location resources,
+	// which should be handled by the generator as if they were actually
+	// the common Location resources.
+	// Example entry: "documentai.googleapis.com/Location"
+	IgnoredResources []string `protobuf:"bytes,4,rep,name=ignored_resources,json=ignoredResources,proto3" json:"ignored_resources,omitempty"`
+	// Namespaces which must be aliased in snippets due to
+	// a known (but non-generator-predictable) naming collision
+	ForcedNamespaceAliases []string `protobuf:"bytes,5,rep,name=forced_namespace_aliases,json=forcedNamespaceAliases,proto3" json:"forced_namespace_aliases,omitempty"`
+	// Method signatures (in the form "service.method(signature)")
+	// which are provided separately, so shouldn't be generated.
+	// Snippets *calling* these methods are still generated, however.
+	HandwrittenSignatures []string `protobuf:"bytes,6,rep,name=handwritten_signatures,json=handwrittenSignatures,proto3" json:"handwritten_signatures,omitempty"`
 }
 
 func (x *DotnetSettings) Reset() {
@@ -836,6 +861,41 @@ func (x *DotnetSettings) GetCommon() *CommonLanguageSettings {
 	return nil
 }
 
+func (x *DotnetSettings) GetRenamedServices() map[string]string {
+	if x != nil {
+		return x.RenamedServices
+	}
+	return nil
+}
+
+func (x *DotnetSettings) GetRenamedResources() map[string]string {
+	if x != nil {
+		return x.RenamedResources
+	}
+	return nil
+}
+
+func (x *DotnetSettings) GetIgnoredResources() []string {
+	if x != nil {
+		return x.IgnoredResources
+	}
+	return nil
+}
+
+func (x *DotnetSettings) GetForcedNamespaceAliases() []string {
+	if x != nil {
+		return x.ForcedNamespaceAliases
+	}
+	return nil
+}
+
+func (x *DotnetSettings) GetHandwrittenSignatures() []string {
+	if x != nil {
+		return x.HandwrittenSignatures
+	}
+	return nil
+}
+
 // Settings for Ruby client libraries.
 type RubySettings struct {
 	state         protoimpl.MessageState
@@ -1037,7 +1097,7 @@ type MethodSettings_LongRunning struct {
 func (x *MethodSettings_LongRunning) Reset() {
 	*x = MethodSettings_LongRunning{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_google_api_client_proto_msgTypes[13]
+		mi := &file_google_api_client_proto_msgTypes[15]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1050,7 +1110,7 @@ func (x *MethodSettings_LongRunning) String() string {
 func (*MethodSettings_LongRunning) ProtoMessage() {}
 
 func (x *MethodSettings_LongRunning) ProtoReflect() protoreflect.Message {
-	mi := &file_google_api_client_proto_msgTypes[13]
+	mi := &file_google_api_client_proto_msgTypes[15]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1335,81 +1395,112 @@ var file_google_api_client_proto_rawDesc = []byte{
 	0x67, 0x73, 0x12, 0x3a, 0x0a, 0x06, 0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x18, 0x01, 0x20, 0x01,
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+	0x74, 0x5f, 0x68, 0x6f, 0x73, 0x74, 0x12, 0x1f, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e,
+	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x53, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65,
+	0x4f, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x18, 0x99, 0x08, 0x20, 0x01, 0x28, 0x09, 0x52, 0x0b,
+	0x64, 0x65, 0x66, 0x61, 0x75, 0x6c, 0x74, 0x48, 0x6f, 0x73, 0x74, 0x3a, 0x43, 0x0a, 0x0c, 0x6f,
+	0x61, 0x75, 0x74, 0x68, 0x5f, 0x73, 0x63, 0x6f, 0x70, 0x65, 0x73, 0x12, 0x1f, 0x2e, 0x67, 0x6f,
+	0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x62, 0x75, 0x66, 0x2e, 0x53, 0x65,
+	0x72, 0x76, 0x69, 0x63, 0x65, 0x4f, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x18, 0x9a, 0x08, 0x20,
+	0x01, 0x28, 0x09, 0x52, 0x0b, 0x6f, 0x61, 0x75, 0x74, 0x68, 0x53, 0x63, 0x6f, 0x70, 0x65, 0x73,
+	0x42, 0x69, 0x0a, 0x0e, 0x63, 0x6f, 0x6d, 0x2e, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x61,
+	0x70, 0x69, 0x42, 0x0b, 0x43, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x50, 0x72, 0x6f, 0x74, 0x6f, 0x50,
+	0x01, 0x5a, 0x41, 0x67, 0x6f, 0x6f, 0x67, 0x6c, 0x65, 0x2e, 0x67, 0x6f, 0x6c, 0x61, 0x6e, 0x67,
+	0x2e, 0x6f, 0x72, 0x67, 0x2f, 0x67, 0x65, 0x6e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2f, 0x67, 0x6f,
+	0x6f, 0x67, 0x6c, 0x65, 0x61, 0x70, 0x69, 0x73, 0x2f, 0x61, 0x70, 0x69, 0x2f, 0x61, 0x6e, 0x6e,
+	0x6f, 0x74, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x73, 0x3b, 0x61, 0x6e, 0x6e, 0x6f, 0x74, 0x61, 0x74,
+	0x69, 0x6f, 0x6e, 0x73, 0xa2, 0x02, 0x04, 0x47, 0x41, 0x50, 0x49, 0x62, 0x06, 0x70, 0x72, 0x6f,
+	0x74, 0x6f, 0x33,
 }
 
 var (
@@ -1425,7 +1516,7 @@ func file_google_api_client_proto_rawDescGZIP() []byte {
 }
 
 var file_google_api_client_proto_enumTypes = make([]protoimpl.EnumInfo, 2)
-var file_google_api_client_proto_msgTypes = make([]protoimpl.MessageInfo, 14)
+var file_google_api_client_proto_msgTypes = make([]protoimpl.MessageInfo, 16)
 var file_google_api_client_proto_goTypes = []interface{}{
 	(ClientLibraryOrganization)(0),      // 0: google.api.ClientLibraryOrganization
 	(ClientLibraryDestination)(0),       // 1: google.api.ClientLibraryDestination
@@ -1442,15 +1533,17 @@ var file_google_api_client_proto_goTypes = []interface{}{
 	(*GoSettings)(nil),                  // 12: google.api.GoSettings
 	(*MethodSettings)(nil),              // 13: google.api.MethodSettings
 	nil,                                 // 14: google.api.JavaSettings.ServiceClassNamesEntry
-	(*MethodSettings_LongRunning)(nil),  // 15: google.api.MethodSettings.LongRunning
+	nil,                                 // 15: google.api.DotnetSettings.RenamedServicesEntry
-	(api.LaunchStage)(0),                // 16: google.api.LaunchStage
+	nil,                                 // 16: google.api.DotnetSettings.RenamedResourcesEntry
-	(*durationpb.Duration)(nil),         // 17: google.protobuf.Duration
+	(*MethodSettings_LongRunning)(nil),  // 17: google.api.MethodSettings.LongRunning
-	(*descriptorpb.MethodOptions)(nil),  // 18: google.protobuf.MethodOptions
+	(api.LaunchStage)(0),                // 18: google.api.LaunchStage
-	(*descriptorpb.ServiceOptions)(nil), // 19: google.protobuf.ServiceOptions
+	(*durationpb.Duration)(nil),         // 19: google.protobuf.Duration
+	(*descriptorpb.MethodOptions)(nil),  // 20: google.protobuf.MethodOptions
+	(*descriptorpb.ServiceOptions)(nil), // 21: google.protobuf.ServiceOptions
 }
 var file_google_api_client_proto_depIdxs = []int32{
 	1,  // 0: google.api.CommonLanguageSettings.destinations:type_name -> google.api.ClientLibraryDestination
-	16, // 1: google.api.ClientLibrarySettings.launch_stage:type_name -> google.api.LaunchStage
+	18, // 1: google.api.ClientLibrarySettings.launch_stage:type_name -> google.api.LaunchStage
 	5,  // 2: google.api.ClientLibrarySettings.java_settings:type_name -> google.api.JavaSettings
 	6,  // 3: google.api.ClientLibrarySettings.cpp_settings:type_name -> google.api.CppSettings
 	7,  // 4: google.api.ClientLibrarySettings.php_settings:type_name -> google.api.PhpSettings
@@ -1469,20 +1562,22 @@ var file_google_api_client_proto_depIdxs = []int32{
 	2,  // 17: google.api.PythonSettings.common:type_name -> google.api.CommonLanguageSettings
 	2,  // 18: google.api.NodeSettings.common:type_name -> google.api.CommonLanguageSettings
 	2,  // 19: google.api.DotnetSettings.common:type_name -> google.api.CommonLanguageSettings
-	2,  // 20: google.api.RubySettings.common:type_name -> google.api.CommonLanguageSettings
+	15, // 20: google.api.DotnetSettings.renamed_services:type_name -> google.api.DotnetSettings.RenamedServicesEntry
-	2,  // 21: google.api.GoSettings.common:type_name -> google.api.CommonLanguageSettings
+	16, // 21: google.api.DotnetSettings.renamed_resources:type_name -> google.api.DotnetSettings.RenamedResourcesEntry
-	15, // 22: google.api.MethodSettings.long_running:type_name -> google.api.MethodSettings.LongRunning
+	2,  // 22: google.api.RubySettings.common:type_name -> google.api.CommonLanguageSettings
-	17, // 23: google.api.MethodSettings.LongRunning.initial_poll_delay:type_name -> google.protobuf.Duration
+	2,  // 23: google.api.GoSettings.common:type_name -> google.api.CommonLanguageSettings
-	17, // 24: google.api.MethodSettings.LongRunning.max_poll_delay:type_name -> google.protobuf.Duration
+	17, // 24: google.api.MethodSettings.long_running:type_name -> google.api.MethodSettings.LongRunning
-	17, // 25: google.api.MethodSettings.LongRunning.total_poll_timeout:type_name -> google.protobuf.Duration
+	19, // 25: google.api.MethodSettings.LongRunning.initial_poll_delay:type_name -> google.protobuf.Duration
-	18, // 26: google.api.method_signature:extendee -> google.protobuf.MethodOptions
+	19, // 26: google.api.MethodSettings.LongRunning.max_poll_delay:type_name -> google.protobuf.Duration
-	19, // 27: google.api.default_host:extendee -> google.protobuf.ServiceOptions
+	19, // 27: google.api.MethodSettings.LongRunning.total_poll_timeout:type_name -> google.protobuf.Duration
-	19, // 28: google.api.oauth_scopes:extendee -> google.protobuf.ServiceOptions
+	20, // 28: google.api.method_signature:extendee -> google.protobuf.MethodOptions
-	29, // [29:29] is the sub-list for method output_type
+	21, // 29: google.api.default_host:extendee -> google.protobuf.ServiceOptions
-	29, // [29:29] is the sub-list for method input_type
+	21, // 30: google.api.oauth_scopes:extendee -> google.protobuf.ServiceOptions
-	29, // [29:29] is the sub-list for extension type_name
+	31, // [31:31] is the sub-list for method output_type
-	26, // [26:29] is the sub-list for extension extendee
+	31, // [31:31] is the sub-list for method input_type
-	0,  // [0:26] is the sub-list for field type_name
+	31, // [31:31] is the sub-list for extension type_name
+	28, // [28:31] is the sub-list for extension extendee
+	0,  // [0:28] is the sub-list for field type_name
 }
 
 func init() { file_google_api_client_proto_init() }
@@ -1635,7 +1730,7 @@ func file_google_api_client_proto_init() {
 				return nil
 			}
 		}
-		file_google_api_client_proto_msgTypes[13].Exporter = func(v interface{}, i int) interface{} {
+		file_google_api_client_proto_msgTypes[15].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*MethodSettings_LongRunning); i {
 			case 0:
 				return &v.state
@@ -1654,7 +1749,7 @@ func file_google_api_client_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_google_api_client_proto_rawDesc,
 			NumEnums:      2,
-			NumMessages:   14,
+			NumMessages:   16,
 			NumExtensions: 3,
 			NumServices:   0,
 		},

vendor/google.golang.org/grpc/CONTRIBUTING.md

@@ -20,6 +20,15 @@ How to get your contributions merged smoothly and quickly.
   both author's & review's time is wasted. Create more PRs to address different
   concerns and everyone will be happy.
 
+- If you are searching for features to work on, issues labeled [Status: Help
+  Wanted](https://github.com/grpc/grpc-go/issues?q=is%3Aissue+is%3Aopen+sort%3Aupdated-desc+label%3A%22Status%3A+Help+Wanted%22)
+  is a great place to start. These issues are well-documented and usually can be
+  resolved with a single pull request.
+
+- If you are adding a new file, make sure it has the copyright message template 
+  at the top as a comment. You can copy over the message from an existing file 
+  and update the year.
+
 - The grpc package should only depend on standard Go packages and a small number
   of exceptions. If your contribution introduces new dependencies which are NOT
   in the [list](https://godoc.org/google.golang.org/grpc?imports), you need a
@@ -32,14 +41,18 @@ How to get your contributions merged smoothly and quickly.
 - Provide a good **PR description** as a record of **what** change is being made
   and **why** it was made. Link to a github issue if it exists.
 
-- Don't fix code style and formatting unless you are already changing that line
+- If you want to fix formatting or style, consider whether your changes are an 
-  to address an issue. PRs with irrelevant changes won't be merged. If you do
+  obvious improvement or might be considered a personal preference. If a style 
-  want to fix formatting or style, do that in a separate PR.
+  change is based on preference, it likely will not be accepted. If it corrects 
+  widely agreed-upon anti-patterns, then please do create a PR and explain the 
+  benefits of the change.
 
 - Unless your PR is trivial, you should expect there will be reviewer comments
-  that you'll need to address before merging. We expect you to be reasonably
+  that you'll need to address before merging. We'll mark it as `Status: Requires
-  responsive to those comments, otherwise the PR will be closed after 2-3 weeks
+  Reporter Clarification` if we expect you to respond to these comments in a
-  of inactivity.
+  timely manner. If the PR remains inactive for 6 days, it will be marked as
+  `stale` and automatically close 7 days after that if we don't hear back from
+  you.
 
 - Maintain **clean commit history** and use **meaningful commit messages**. PRs
   with messy commit history are difficult to review and won't be merged. Use

vendor/google.golang.org/grpc/attributes/attributes.go

@@ -25,6 +25,11 @@
 // later release.
 package attributes
 
+import (
+	"fmt"
+	"strings"
+)
+
 // Attributes is an immutable struct for storing and retrieving generic
 // key/value pairs.  Keys must be hashable, and users should define their own
 // types for keys.  Values should not be modified after they are added to an
@@ -99,3 +104,27 @@ func (a *Attributes) Equal(o *Attributes) bool {
 	}
 	return true
 }
+
+// String prints the attribute map. If any key or values throughout the map
+// implement fmt.Stringer, it calls that method and appends.
+func (a *Attributes) String() string {
+	var sb strings.Builder
+	sb.WriteString("{")
+	first := true
+	for k, v := range a.m {
+		var key, val string
+		if str, ok := k.(interface{ String() string }); ok {
+			key = str.String()
+		}
+		if str, ok := v.(interface{ String() string }); ok {
+			val = str.String()
+		}
+		if !first {
+			sb.WriteString(", ")
+		}
+		sb.WriteString(fmt.Sprintf("%q: %q, ", key, val))
+		first = false
+	}
+	sb.WriteString("}")
+	return sb.String()
+}

vendor/google.golang.org/grpc/balancer/balancer.go

@@ -286,7 +286,7 @@ type PickResult struct {
 	//
 	// LB policies with child policies are responsible for propagating metadata
 	// injected by their children to the ClientConn, as part of Pick().
-	Metatada metadata.MD
+	Metadata metadata.MD
 }
 
 // TransientFailureError returns e.  It exists for backward compatibility and

vendor/google.golang.org/grpc/balancer/grpclb/grpc_lb_v1/load_balancer.pb.go

@@ -19,8 +19,8 @@
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.28.1
+// 	protoc-gen-go v1.30.0
-// 	protoc        v3.14.0
+// 	protoc        v4.22.0
 // source: grpc/lb/v1/load_balancer.proto
 
 package grpc_lb_v1

vendor/google.golang.org/grpc/balancer/grpclb/grpc_lb_v1/load_balancer_grpc.pb.go

@@ -19,8 +19,8 @@
 
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
 // versions:
-// - protoc-gen-go-grpc v1.2.0
+// - protoc-gen-go-grpc v1.3.0
-// - protoc             v3.14.0
+// - protoc             v4.22.0
 // source: grpc/lb/v1/load_balancer.proto
 
 package grpc_lb_v1
@@ -37,6 +37,10 @@ import (
 // Requires gRPC-Go v1.32.0 or later.
 const _ = grpc.SupportPackageIsVersion7
 
+const (
+	LoadBalancer_BalanceLoad_FullMethodName = "/grpc.lb.v1.LoadBalancer/BalanceLoad"
+)
+
 // LoadBalancerClient is the client API for LoadBalancer service.
 //
 // For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
@@ -54,7 +58,7 @@ func NewLoadBalancerClient(cc grpc.ClientConnInterface) LoadBalancerClient {
 }
 
 func (c *loadBalancerClient) BalanceLoad(ctx context.Context, opts ...grpc.CallOption) (LoadBalancer_BalanceLoadClient, error) {
-	stream, err := c.cc.NewStream(ctx, &LoadBalancer_ServiceDesc.Streams[0], "/grpc.lb.v1.LoadBalancer/BalanceLoad", opts...)
+	stream, err := c.cc.NewStream(ctx, &LoadBalancer_ServiceDesc.Streams[0], LoadBalancer_BalanceLoad_FullMethodName, opts...)
 	if err != nil {
 		return nil, err
 	}

vendor/google.golang.org/grpc/balancer_conn_wrappers.go

@@ -25,14 +25,20 @@ import (
 	"sync"
 
 	"google.golang.org/grpc/balancer"
-	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/connectivity"
 	"google.golang.org/grpc/internal/balancer/gracefulswitch"
-	"google.golang.org/grpc/internal/buffer"
 	"google.golang.org/grpc/internal/channelz"
 	"google.golang.org/grpc/internal/grpcsync"
 	"google.golang.org/grpc/resolver"
-	"google.golang.org/grpc/status"
+)
+
+type ccbMode int
+
+const (
+	ccbModeActive = iota
+	ccbModeIdle
+	ccbModeClosed
+	ccbModeExitingIdle
 )
 
 // ccBalancerWrapper sits between the ClientConn and the Balancer.
@@ -49,192 +55,101 @@ import (
 // It uses the gracefulswitch.Balancer internally to ensure that balancer
 // switches happen in a graceful manner.
 type ccBalancerWrapper struct {
-	cc *ClientConn
+	// The following fields are initialized when the wrapper is created and are
+	// read-only afterwards, and therefore can be accessed without a mutex.
+	cc   *ClientConn
+	opts balancer.BuildOptions
 
-	// Since these fields are accessed only from handleXxx() methods which are
+	// Outgoing (gRPC --> balancer) calls are guaranteed to execute in a
-	// synchronized by the watcher goroutine, we do not need a mutex to protect
+	// mutually exclusive manner as they are scheduled in the serializer. Fields
-	// these fields.
+	// accessed *only* in these serializer callbacks, can therefore be accessed
+	// without a mutex.
 	balancer        *gracefulswitch.Balancer
 	curBalancerName string
 
-	updateCh *buffer.Unbounded // Updates written on this channel are processed by watcher().
+	// mu guards access to the below fields. Access to the serializer and its
-	resultCh *buffer.Unbounded // Results of calls to UpdateClientConnState() are pushed here.
+	// cancel function needs to be mutex protected because they are overwritten
-	closed   *grpcsync.Event   // Indicates if close has been called.
+	// when the wrapper exits idle mode.
-	done     *grpcsync.Event   // Indicates if close has completed its work.
+	mu               sync.Mutex
+	serializer       *grpcsync.CallbackSerializer // To serialize all outoing calls.
+	serializerCancel context.CancelFunc           // To close the seralizer at close/enterIdle time.
+	mode             ccbMode                      // Tracks the current mode of the wrapper.
 }
 
 // newCCBalancerWrapper creates a new balancer wrapper. The underlying balancer
 // is not created until the switchTo() method is invoked.
 func newCCBalancerWrapper(cc *ClientConn, bopts balancer.BuildOptions) *ccBalancerWrapper {
+	ctx, cancel := context.WithCancel(context.Background())
 	ccb := &ccBalancerWrapper{
-		cc:       cc,
+		cc:               cc,
-		updateCh: buffer.NewUnbounded(),
+		opts:             bopts,
-		resultCh: buffer.NewUnbounded(),
+		serializer:       grpcsync.NewCallbackSerializer(ctx),
-		closed:   grpcsync.NewEvent(),
+		serializerCancel: cancel,
-		done:     grpcsync.NewEvent(),
 	}
-	go ccb.watcher()
 	ccb.balancer = gracefulswitch.NewBalancer(ccb, bopts)
 	return ccb
 }
 
-// The following xxxUpdate structs wrap the arguments received as part of the
-// corresponding update. The watcher goroutine uses the 'type' of the update to
-// invoke the appropriate handler routine to handle the update.
-
-type ccStateUpdate struct {
-	ccs *balancer.ClientConnState
-}
-
-type scStateUpdate struct {
-	sc    balancer.SubConn
-	state connectivity.State
-	err   error
-}
-
-type exitIdleUpdate struct{}
-
-type resolverErrorUpdate struct {
-	err error
-}
-
-type switchToUpdate struct {
-	name string
-}
-
-type subConnUpdate struct {
-	acbw *acBalancerWrapper
-}
-
-// watcher is a long-running goroutine which reads updates from a channel and
-// invokes corresponding methods on the underlying balancer. It ensures that
-// these methods are invoked in a synchronous fashion. It also ensures that
-// these methods are invoked in the order in which the updates were received.
-func (ccb *ccBalancerWrapper) watcher() {
-	for {
-		select {
-		case u := <-ccb.updateCh.Get():
-			ccb.updateCh.Load()
-			if ccb.closed.HasFired() {
-				break
-			}
-			switch update := u.(type) {
-			case *ccStateUpdate:
-				ccb.handleClientConnStateChange(update.ccs)
-			case *scStateUpdate:
-				ccb.handleSubConnStateChange(update)
-			case *exitIdleUpdate:
-				ccb.handleExitIdle()
-			case *resolverErrorUpdate:
-				ccb.handleResolverError(update.err)
-			case *switchToUpdate:
-				ccb.handleSwitchTo(update.name)
-			case *subConnUpdate:
-				ccb.handleRemoveSubConn(update.acbw)
-			default:
-				logger.Errorf("ccBalancerWrapper.watcher: unknown update %+v, type %T", update, update)
-			}
-		case <-ccb.closed.Done():
-		}
-
-		if ccb.closed.HasFired() {
-			ccb.handleClose()
-			return
-		}
-	}
-}
-
 // updateClientConnState is invoked by grpc to push a ClientConnState update to
 // the underlying balancer.
-//
-// Unlike other methods invoked by grpc to push updates to the underlying
-// balancer, this method cannot simply push the update onto the update channel
-// and return. It needs to return the error returned by the underlying balancer
-// back to grpc which propagates that to the resolver.
 func (ccb *ccBalancerWrapper) updateClientConnState(ccs *balancer.ClientConnState) error {
-	ccb.updateCh.Put(&ccStateUpdate{ccs: ccs})
+	ccb.mu.Lock()
-
+	errCh := make(chan error, 1)
-	var res interface{}
+	// Here and everywhere else where Schedule() is called, it is done with the
-	select {
+	// lock held. But the lock guards only the scheduling part. The actual
-	case res = <-ccb.resultCh.Get():
+	// callback is called asynchronously without the lock being held.
-		ccb.resultCh.Load()
+	ok := ccb.serializer.Schedule(func(_ context.Context) {
-	case <-ccb.closed.Done():
+		// If the addresses specified in the update contain addresses of type
-		// Return early if the balancer wrapper is closed while we are waiting for
+		// "grpclb" and the selected LB policy is not "grpclb", these addresses
-		// the underlying balancer to process a ClientConnState update.
+		// will be filtered out and ccs will be modified with the updated
-		return nil
+		// address list.
-	}
+		if ccb.curBalancerName != grpclbName {
-	// If the returned error is nil, attempting to type assert to error leads to
+			var addrs []resolver.Address
-	// panic. So, this needs to handled separately.
+			for _, addr := range ccs.ResolverState.Addresses {
-	if res == nil {
+				if addr.Type == resolver.GRPCLB {
-		return nil
+					continue
-	}
+				}
-	return res.(error)
+				addrs = append(addrs, addr)
-}
-
-// handleClientConnStateChange handles a ClientConnState update from the update
-// channel and invokes the appropriate method on the underlying balancer.
-//
-// If the addresses specified in the update contain addresses of type "grpclb"
-// and the selected LB policy is not "grpclb", these addresses will be filtered
-// out and ccs will be modified with the updated address list.
-func (ccb *ccBalancerWrapper) handleClientConnStateChange(ccs *balancer.ClientConnState) {
-	if ccb.curBalancerName != grpclbName {
-		// Filter any grpclb addresses since we don't have the grpclb balancer.
-		var addrs []resolver.Address
-		for _, addr := range ccs.ResolverState.Addresses {
-			if addr.Type == resolver.GRPCLB {
-				continue
 			}
-			addrs = append(addrs, addr)
+			ccs.ResolverState.Addresses = addrs
 		}
-		ccs.ResolverState.Addresses = addrs
+		errCh <- ccb.balancer.UpdateClientConnState(*ccs)
+	})
+	if !ok {
+		// If we are unable to schedule a function with the serializer, it
+		// indicates that it has been closed. A serializer is only closed when
+		// the wrapper is closed or is in idle.
+		ccb.mu.Unlock()
+		return fmt.Errorf("grpc: cannot send state update to a closed or idle balancer")
 	}
-	ccb.resultCh.Put(ccb.balancer.UpdateClientConnState(*ccs))
+	ccb.mu.Unlock()
+
+	// We get here only if the above call to Schedule succeeds, in which case it
+	// is guaranteed that the scheduled function will run. Therefore it is safe
+	// to block on this channel.
+	err := <-errCh
+	if logger.V(2) && err != nil {
+		logger.Infof("error from balancer.UpdateClientConnState: %v", err)
+	}
+	return err
 }
 
 // updateSubConnState is invoked by grpc to push a subConn state update to the
 // underlying balancer.
 func (ccb *ccBalancerWrapper) updateSubConnState(sc balancer.SubConn, s connectivity.State, err error) {
-	// When updating addresses for a SubConn, if the address in use is not in
+	ccb.mu.Lock()
-	// the new addresses, the old ac will be tearDown() and a new ac will be
+	ccb.serializer.Schedule(func(_ context.Context) {
-	// created. tearDown() generates a state change with Shutdown state, we
+		ccb.balancer.UpdateSubConnState(sc, balancer.SubConnState{ConnectivityState: s, ConnectionError: err})
-	// don't want the balancer to receive this state change. So before
-	// tearDown() on the old ac, ac.acbw (acWrapper) will be set to nil, and
-	// this function will be called with (nil, Shutdown). We don't need to call
-	// balancer method in this case.
-	if sc == nil {
-		return
-	}
-	ccb.updateCh.Put(&scStateUpdate{
-		sc:    sc,
-		state: s,
-		err:   err,
 	})
-}
+	ccb.mu.Unlock()
-
-// handleSubConnStateChange handles a SubConnState update from the update
-// channel and invokes the appropriate method on the underlying balancer.
-func (ccb *ccBalancerWrapper) handleSubConnStateChange(update *scStateUpdate) {
-	ccb.balancer.UpdateSubConnState(update.sc, balancer.SubConnState{ConnectivityState: update.state, ConnectionError: update.err})
-}
-
-func (ccb *ccBalancerWrapper) exitIdle() {
-	ccb.updateCh.Put(&exitIdleUpdate{})
-}
-
-func (ccb *ccBalancerWrapper) handleExitIdle() {
-	if ccb.cc.GetState() != connectivity.Idle {
-		return
-	}
-	ccb.balancer.ExitIdle()
 }
 
 func (ccb *ccBalancerWrapper) resolverError(err error) {
-	ccb.updateCh.Put(&resolverErrorUpdate{err: err})
+	ccb.mu.Lock()
-}
+	ccb.serializer.Schedule(func(_ context.Context) {
-
+		ccb.balancer.ResolverError(err)
-func (ccb *ccBalancerWrapper) handleResolverError(err error) {
+	})
-	ccb.balancer.ResolverError(err)
+	ccb.mu.Unlock()
 }
 
 // switchTo is invoked by grpc to instruct the balancer wrapper to switch to the
@@ -248,24 +163,27 @@ func (ccb *ccBalancerWrapper) handleResolverError(err error) {
 // the ccBalancerWrapper keeps track of the current LB policy name, and skips
 // the graceful balancer switching process if the name does not change.
 func (ccb *ccBalancerWrapper) switchTo(name string) {
-	ccb.updateCh.Put(&switchToUpdate{name: name})
+	ccb.mu.Lock()
+	ccb.serializer.Schedule(func(_ context.Context) {
+		// TODO: Other languages use case-sensitive balancer registries. We should
+		// switch as well. See: https://github.com/grpc/grpc-go/issues/5288.
+		if strings.EqualFold(ccb.curBalancerName, name) {
+			return
+		}
+		ccb.buildLoadBalancingPolicy(name)
+	})
+	ccb.mu.Unlock()
 }
 
-// handleSwitchTo handles a balancer switch update from the update channel. It
+// buildLoadBalancingPolicy performs the following:
-// calls the SwitchTo() method on the gracefulswitch.Balancer with a
+//   - retrieve a balancer builder for the given name. Use the default LB
-// balancer.Builder corresponding to name. If no balancer.Builder is registered
+//     policy, pick_first, if no LB policy with name is found in the registry.
-// for the given name, it uses the default LB policy which is "pick_first".
+//   - instruct the gracefulswitch balancer to switch to the above builder. This
-func (ccb *ccBalancerWrapper) handleSwitchTo(name string) {
+//     will actually build the new balancer.
-	// TODO: Other languages use case-insensitive balancer registries. We should
+//   - update the `curBalancerName` field
-	// switch as well. See: https://github.com/grpc/grpc-go/issues/5288.
+//
-	if strings.EqualFold(ccb.curBalancerName, name) {
+// Must be called from a serializer callback.
-		return
+func (ccb *ccBalancerWrapper) buildLoadBalancingPolicy(name string) {
-	}
-
-	// TODO: Ensure that name is a registered LB policy when we get here.
-	// We currently only validate the `loadBalancingConfig` field. We need to do
-	// the same for the `loadBalancingPolicy` field and reject the service config
-	// if the specified policy is not registered.
 	builder := balancer.Get(name)
 	if builder == nil {
 		channelz.Warningf(logger, ccb.cc.channelzID, "Channel switches to new LB policy %q, since the specified LB policy %q was not registered", PickFirstBalancerName, name)
@@ -281,26 +199,114 @@ func (ccb *ccBalancerWrapper) handleSwitchTo(name string) {
 	ccb.curBalancerName = builder.Name()
 }
 
-// handleRemoveSucConn handles a request from the underlying balancer to remove
-// a subConn.
-//
-// See comments in RemoveSubConn() for more details.
-func (ccb *ccBalancerWrapper) handleRemoveSubConn(acbw *acBalancerWrapper) {
-	ccb.cc.removeAddrConn(acbw.getAddrConn(), errConnDrain)
-}
-
 func (ccb *ccBalancerWrapper) close() {
-	ccb.closed.Fire()
+	channelz.Info(logger, ccb.cc.channelzID, "ccBalancerWrapper: closing")
-	<-ccb.done.Done()
+	ccb.closeBalancer(ccbModeClosed)
 }
 
-func (ccb *ccBalancerWrapper) handleClose() {
+// enterIdleMode is invoked by grpc when the channel enters idle mode upon
-	ccb.balancer.Close()
+// expiry of idle_timeout. This call blocks until the balancer is closed.
-	ccb.done.Fire()
+func (ccb *ccBalancerWrapper) enterIdleMode() {
+	channelz.Info(logger, ccb.cc.channelzID, "ccBalancerWrapper: entering idle mode")
+	ccb.closeBalancer(ccbModeIdle)
+}
+
+// closeBalancer is invoked when the channel is being closed or when it enters
+// idle mode upon expiry of idle_timeout.
+func (ccb *ccBalancerWrapper) closeBalancer(m ccbMode) {
+	ccb.mu.Lock()
+	if ccb.mode == ccbModeClosed || ccb.mode == ccbModeIdle {
+		ccb.mu.Unlock()
+		return
+	}
+
+	ccb.mode = m
+	done := ccb.serializer.Done
+	b := ccb.balancer
+	ok := ccb.serializer.Schedule(func(_ context.Context) {
+		// Close the serializer to ensure that no more calls from gRPC are sent
+		// to the balancer.
+		ccb.serializerCancel()
+		// Empty the current balancer name because we don't have a balancer
+		// anymore and also so that we act on the next call to switchTo by
+		// creating a new balancer specified by the new resolver.
+		ccb.curBalancerName = ""
+	})
+	if !ok {
+		ccb.mu.Unlock()
+		return
+	}
+	ccb.mu.Unlock()
+
+	// Give enqueued callbacks a chance to finish.
+	<-done
+	// Spawn a goroutine to close the balancer (since it may block trying to
+	// cleanup all allocated resources) and return early.
+	go b.Close()
+}
+
+// exitIdleMode is invoked by grpc when the channel exits idle mode either
+// because of an RPC or because of an invocation of the Connect() API. This
+// recreates the balancer that was closed previously when entering idle mode.
+//
+// If the channel is not in idle mode, we know for a fact that we are here as a
+// result of the user calling the Connect() method on the ClientConn. In this
+// case, we can simply forward the call to the underlying balancer, instructing
+// it to reconnect to the backends.
+func (ccb *ccBalancerWrapper) exitIdleMode() {
+	ccb.mu.Lock()
+	if ccb.mode == ccbModeClosed {
+		// Request to exit idle is a no-op when wrapper is already closed.
+		ccb.mu.Unlock()
+		return
+	}
+
+	if ccb.mode == ccbModeIdle {
+		// Recreate the serializer which was closed when we entered idle.
+		ctx, cancel := context.WithCancel(context.Background())
+		ccb.serializer = grpcsync.NewCallbackSerializer(ctx)
+		ccb.serializerCancel = cancel
+	}
+
+	// The ClientConn guarantees that mutual exclusion between close() and
+	// exitIdleMode(), and since we just created a new serializer, we can be
+	// sure that the below function will be scheduled.
+	done := make(chan struct{})
+	ccb.serializer.Schedule(func(_ context.Context) {
+		defer close(done)
+
+		ccb.mu.Lock()
+		defer ccb.mu.Unlock()
+
+		if ccb.mode != ccbModeIdle {
+			ccb.balancer.ExitIdle()
+			return
+		}
+
+		// Gracefulswitch balancer does not support a switchTo operation after
+		// being closed. Hence we need to create a new one here.
+		ccb.balancer = gracefulswitch.NewBalancer(ccb, ccb.opts)
+		ccb.mode = ccbModeActive
+		channelz.Info(logger, ccb.cc.channelzID, "ccBalancerWrapper: exiting idle mode")
+
+	})
+	ccb.mu.Unlock()
+
+	<-done
+}
+
+func (ccb *ccBalancerWrapper) isIdleOrClosed() bool {
+	ccb.mu.Lock()
+	defer ccb.mu.Unlock()
+	return ccb.mode == ccbModeIdle || ccb.mode == ccbModeClosed
 }
 
 func (ccb *ccBalancerWrapper) NewSubConn(addrs []resolver.Address, opts balancer.NewSubConnOptions) (balancer.SubConn, error) {
-	if len(addrs) <= 0 {
+	if ccb.isIdleOrClosed() {
+		return nil, fmt.Errorf("grpc: cannot create SubConn when balancer is closed or idle")
+	}
+
+	if len(addrs) == 0 {
 		return nil, fmt.Errorf("grpc: cannot create SubConn with empty address list")
 	}
 	ac, err := ccb.cc.newAddrConn(addrs, opts)
@@ -309,31 +315,35 @@ func (ccb *ccBalancerWrapper) NewSubConn(addrs []resolver.Address, opts balancer
 		return nil, err
 	}
 	acbw := &acBalancerWrapper{ac: ac, producers: make(map[balancer.ProducerBuilder]*refCountedProducer)}
-	acbw.ac.mu.Lock()
 	ac.acbw = acbw
-	acbw.ac.mu.Unlock()
 	return acbw, nil
 }
 
 func (ccb *ccBalancerWrapper) RemoveSubConn(sc balancer.SubConn) {
-	// Before we switched the ccBalancerWrapper to use gracefulswitch.Balancer, it
+	if ccb.isIdleOrClosed() {
-	// was required to handle the RemoveSubConn() method asynchronously by pushing
+		// It it safe to ignore this call when the balancer is closed or in idle
-	// the update onto the update channel. This was done to avoid a deadlock as
+		// because the ClientConn takes care of closing the connections.
-	// switchBalancer() was holding cc.mu when calling Close() on the old
+		//
-	// balancer, which would in turn call RemoveSubConn().
+		// Not returning early from here when the balancer is closed or in idle
-	//
+		// leads to a deadlock though, because of the following sequence of
-	// With the use of gracefulswitch.Balancer in ccBalancerWrapper, handling this
+		// calls when holding cc.mu:
-	// asynchronously is probably not required anymore since the switchTo() method
+		// cc.exitIdleMode --> ccb.enterIdleMode --> gsw.Close -->
-	// handles the balancer switch by pushing the update onto the channel.
+		// ccb.RemoveAddrConn --> cc.removeAddrConn
-	// TODO(easwars): Handle this inline.
+		return
+	}
+
 	acbw, ok := sc.(*acBalancerWrapper)
 	if !ok {
 		return
 	}
-	ccb.updateCh.Put(&subConnUpdate{acbw: acbw})
+	ccb.cc.removeAddrConn(acbw.ac, errConnDrain)
 }
 
 func (ccb *ccBalancerWrapper) UpdateAddresses(sc balancer.SubConn, addrs []resolver.Address) {
+	if ccb.isIdleOrClosed() {
+		return
+	}
+
 	acbw, ok := sc.(*acBalancerWrapper)
 	if !ok {
 		return
@@ -342,6 +352,10 @@ func (ccb *ccBalancerWrapper) UpdateAddresses(sc balancer.SubConn, addrs []resol
 }
 
 func (ccb *ccBalancerWrapper) UpdateState(s balancer.State) {
+	if ccb.isIdleOrClosed() {
+		return
+	}
+
 	// Update picker before updating state.  Even though the ordering here does
 	// not matter, it can lead to multiple calls of Pick in the common start-up
 	// case where we wait for ready and then perform an RPC.  If the picker is
@@ -352,6 +366,10 @@ func (ccb *ccBalancerWrapper) UpdateState(s balancer.State) {
 }
 
 func (ccb *ccBalancerWrapper) ResolveNow(o resolver.ResolveNowOptions) {
+	if ccb.isIdleOrClosed() {
+		return
+	}
+
 	ccb.cc.resolveNow(o)
 }
 
@@ -362,71 +380,31 @@ func (ccb *ccBalancerWrapper) Target() string {
 // acBalancerWrapper is a wrapper on top of ac for balancers.
 // It implements balancer.SubConn interface.
 type acBalancerWrapper struct {
+	ac *addrConn // read-only
+
 	mu        sync.Mutex
-	ac        *addrConn
 	producers map[balancer.ProducerBuilder]*refCountedProducer
 }
 
+func (acbw *acBalancerWrapper) String() string {
+	return fmt.Sprintf("SubConn(id:%d)", acbw.ac.channelzID.Int())
+}
+
 func (acbw *acBalancerWrapper) UpdateAddresses(addrs []resolver.Address) {
-	acbw.mu.Lock()
+	acbw.ac.updateAddrs(addrs)
-	defer acbw.mu.Unlock()
-	if len(addrs) <= 0 {
-		acbw.ac.cc.removeAddrConn(acbw.ac, errConnDrain)
-		return
-	}
-	if !acbw.ac.tryUpdateAddrs(addrs) {
-		cc := acbw.ac.cc
-		opts := acbw.ac.scopts
-		acbw.ac.mu.Lock()
-		// Set old ac.acbw to nil so the Shutdown state update will be ignored
-		// by balancer.
-		//
-		// TODO(bar) the state transition could be wrong when tearDown() old ac
-		// and creating new ac, fix the transition.
-		acbw.ac.acbw = nil
-		acbw.ac.mu.Unlock()
-		acState := acbw.ac.getState()
-		acbw.ac.cc.removeAddrConn(acbw.ac, errConnDrain)
-
-		if acState == connectivity.Shutdown {
-			return
-		}
-
-		newAC, err := cc.newAddrConn(addrs, opts)
-		if err != nil {
-			channelz.Warningf(logger, acbw.ac.channelzID, "acBalancerWrapper: UpdateAddresses: failed to newAddrConn: %v", err)
-			return
-		}
-		acbw.ac = newAC
-		newAC.mu.Lock()
-		newAC.acbw = acbw
-		newAC.mu.Unlock()
-		if acState != connectivity.Idle {
-			go newAC.connect()
-		}
-	}
 }
 
 func (acbw *acBalancerWrapper) Connect() {
-	acbw.mu.Lock()
-	defer acbw.mu.Unlock()
 	go acbw.ac.connect()
 }
 
-func (acbw *acBalancerWrapper) getAddrConn() *addrConn {
-	acbw.mu.Lock()
-	defer acbw.mu.Unlock()
-	return acbw.ac
-}
-
-var errSubConnNotReady = status.Error(codes.Unavailable, "SubConn not currently connected")
-
 // NewStream begins a streaming RPC on the addrConn.  If the addrConn is not
-// ready, returns errSubConnNotReady.
+// ready, blocks until it is or ctx expires.  Returns an error when the context
+// expires or the addrConn is shut down.
 func (acbw *acBalancerWrapper) NewStream(ctx context.Context, desc *StreamDesc, method string, opts ...CallOption) (ClientStream, error) {
-	transport := acbw.ac.getReadyTransport()
+	transport, err := acbw.ac.getTransport(ctx)
-	if transport == nil {
+	if err != nil {
-		return nil, errSubConnNotReady
+		return nil, err
 	}
 	return newNonRetryClientStream(ctx, desc, method, transport, acbw.ac, opts...)
 }

vendor/google.golang.org/grpc/binarylog/grpc_binarylog_v1/binarylog.pb.go

@@ -18,8 +18,8 @@
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.28.1
+// 	protoc-gen-go v1.30.0
-// 	protoc        v3.14.0
+// 	protoc        v4.22.0
 // source: grpc/binlog/v1/binarylog.proto
 
 package grpc_binarylog_v1

vendor/google.golang.org/grpc/call.go

@@ -27,6 +27,11 @@ import (
 //
 // All errors returned by Invoke are compatible with the status package.
 func (cc *ClientConn) Invoke(ctx context.Context, method string, args, reply interface{}, opts ...CallOption) error {
+	if err := cc.idlenessMgr.onCallBegin(); err != nil {
+		return err
+	}
+	defer cc.idlenessMgr.onCallEnd()
+
 	// allow interceptor to see all applicable call options, which means those
 	// configured as defaults from dial option as well as per-call options
 	opts = combine(cc.dopts.callOptions, opts)

vendor/google.golang.org/grpc/clientconn.go

@@ -24,7 +24,6 @@ import (
 	"fmt"
 	"math"
 	"net/url"
-	"reflect"
 	"strings"
 	"sync"
 	"sync/atomic"
@@ -69,6 +68,9 @@ var (
 	errConnDrain = errors.New("grpc: the connection is drained")
 	// errConnClosing indicates that the connection is closing.
 	errConnClosing = errors.New("grpc: the connection is closing")
+	// errConnIdling indicates the the connection is being closed as the channel
+	// is moving to an idle mode due to inactivity.
+	errConnIdling = errors.New("grpc: the connection is closing due to channel idleness")
 	// invalidDefaultServiceConfigErrPrefix is used to prefix the json parsing error for the default
 	// service config.
 	invalidDefaultServiceConfigErrPrefix = "grpc: the provided default service config is invalid"
@@ -134,20 +136,42 @@ func (dcs *defaultConfigSelector) SelectConfig(rpcInfo iresolver.RPCInfo) (*ires
 // e.g. to use dns resolver, a "dns:///" prefix should be applied to the target.
 func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *ClientConn, err error) {
 	cc := &ClientConn{
-		target:            target,
+		target: target,
-		csMgr:             &connectivityStateManager{},
+		csMgr:  &connectivityStateManager{},
-		conns:             make(map[*addrConn]struct{}),
+		conns:  make(map[*addrConn]struct{}),
-		dopts:             defaultDialOptions(),
+		dopts:  defaultDialOptions(),
-		blockingpicker:    newPickerWrapper(),
+		czData: new(channelzData),
-		czData:            new(channelzData),
-		firstResolveEvent: grpcsync.NewEvent(),
 	}
+
+	// We start the channel off in idle mode, but kick it out of idle at the end
+	// of this method, instead of waiting for the first RPC. Other gRPC
+	// implementations do wait for the first RPC to kick the channel out of
+	// idle. But doing so would be a major behavior change for our users who are
+	// used to seeing the channel active after Dial.
+	//
+	// Taking this approach of kicking it out of idle at the end of this method
+	// allows us to share the code between channel creation and exiting idle
+	// mode. This will also make it easy for us to switch to starting the
+	// channel off in idle, if at all we ever get to do that.
+	cc.idlenessState = ccIdlenessStateIdle
+
 	cc.retryThrottler.Store((*retryThrottler)(nil))
 	cc.safeConfigSelector.UpdateConfigSelector(&defaultConfigSelector{nil})
 	cc.ctx, cc.cancel = context.WithCancel(context.Background())
+	cc.exitIdleCond = sync.NewCond(&cc.mu)
 
-	for _, opt := range extraDialOptions {
+	disableGlobalOpts := false
-		opt.apply(&cc.dopts)
+	for _, opt := range opts {
+		if _, ok := opt.(*disableGlobalDialOptions); ok {
+			disableGlobalOpts = true
+			break
+		}
+	}
+
+	if !disableGlobalOpts {
+		for _, opt := range globalDialOptions {
+			opt.apply(&cc.dopts)
+		}
 	}
 
 	for _, opt := range opts {
@@ -163,40 +187,11 @@ func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *
 		}
 	}()
 
-	pid := cc.dopts.channelzParentID
+	// Register ClientConn with channelz.
-	cc.channelzID = channelz.RegisterChannel(&channelzChannel{cc}, pid, target)
+	cc.channelzRegistration(target)
-	ted := &channelz.TraceEventDesc{
-		Desc:     "Channel created",
-		Severity: channelz.CtInfo,
-	}
-	if cc.dopts.channelzParentID != nil {
-		ted.Parent = &channelz.TraceEventDesc{
-			Desc:     fmt.Sprintf("Nested Channel(id:%d) created", cc.channelzID.Int()),
-			Severity: channelz.CtInfo,
-		}
-	}
-	channelz.AddTraceEvent(logger, cc.channelzID, 1, ted)
-	cc.csMgr.channelzID = cc.channelzID
 
-	if cc.dopts.copts.TransportCredentials == nil && cc.dopts.copts.CredsBundle == nil {
+	if err := cc.validateTransportCredentials(); err != nil {
-		return nil, errNoTransportSecurity
+		return nil, err
-	}
-	if cc.dopts.copts.TransportCredentials != nil && cc.dopts.copts.CredsBundle != nil {
-		return nil, errTransportCredsAndBundle
-	}
-	if cc.dopts.copts.CredsBundle != nil && cc.dopts.copts.CredsBundle.TransportCredentials() == nil {
-		return nil, errNoTransportCredsInBundle
-	}
-	transportCreds := cc.dopts.copts.TransportCredentials
-	if transportCreds == nil {
-		transportCreds = cc.dopts.copts.CredsBundle.TransportCredentials()
-	}
-	if transportCreds.Info().SecurityProtocol == "insecure" {
-		for _, cd := range cc.dopts.copts.PerRPCCredentials {
-			if cd.RequireTransportSecurity() {
-				return nil, errTransportCredentialsMissing
-			}
-		}
 	}
 
 	if cc.dopts.defaultServiceConfigRawJSON != nil {
@@ -234,35 +229,19 @@ func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *
 		}
 	}()
 
-	scSet := false
-	if cc.dopts.scChan != nil {
-		// Try to get an initial service config.
-		select {
-		case sc, ok := <-cc.dopts.scChan:
-			if ok {
-				cc.sc = &sc
-				cc.safeConfigSelector.UpdateConfigSelector(&defaultConfigSelector{&sc})
-				scSet = true
-			}
-		default:
-		}
-	}
 	if cc.dopts.bs == nil {
 		cc.dopts.bs = backoff.DefaultExponential
 	}
 
 	// Determine the resolver to use.
-	resolverBuilder, err := cc.parseTargetAndFindResolver()
+	if err := cc.parseTargetAndFindResolver(); err != nil {
-	if err != nil {
 		return nil, err
 	}
-	cc.authority, err = determineAuthority(cc.parsedTarget.Endpoint(), cc.target, cc.dopts)
+	if err = cc.determineAuthority(); err != nil {
-	if err != nil {
 		return nil, err
 	}
-	channelz.Infof(logger, cc.channelzID, "Channel authority set to %q", cc.authority)
 
-	if cc.dopts.scChan != nil && !scSet {
+	if cc.dopts.scChan != nil {
 		// Blocking wait for the initial service config.
 		select {
 		case sc, ok := <-cc.dopts.scChan:
@@ -278,57 +257,224 @@ func DialContext(ctx context.Context, target string, opts ...DialOption) (conn *
 		go cc.scWatcher()
 	}
 
+	// This creates the name resolver, load balancer, blocking picker etc.
+	if err := cc.exitIdleMode(); err != nil {
+		return nil, err
+	}
+
+	// Configure idleness support with configured idle timeout or default idle
+	// timeout duration. Idleness can be explicitly disabled by the user, by
+	// setting the dial option to 0.
+	cc.idlenessMgr = newIdlenessManager(cc, cc.dopts.idleTimeout)
+
+	// Return early for non-blocking dials.
+	if !cc.dopts.block {
+		return cc, nil
+	}
+
+	// A blocking dial blocks until the clientConn is ready.
+	for {
+		s := cc.GetState()
+		if s == connectivity.Idle {
+			cc.Connect()
+		}
+		if s == connectivity.Ready {
+			return cc, nil
+		} else if cc.dopts.copts.FailOnNonTempDialError && s == connectivity.TransientFailure {
+			if err = cc.connectionError(); err != nil {
+				terr, ok := err.(interface {
+					Temporary() bool
+				})
+				if ok && !terr.Temporary() {
+					return nil, err
+				}
+			}
+		}
+		if !cc.WaitForStateChange(ctx, s) {
+			// ctx got timeout or canceled.
+			if err = cc.connectionError(); err != nil && cc.dopts.returnLastError {
+				return nil, err
+			}
+			return nil, ctx.Err()
+		}
+	}
+}
+
+// addTraceEvent is a helper method to add a trace event on the channel. If the
+// channel is a nested one, the same event is also added on the parent channel.
+func (cc *ClientConn) addTraceEvent(msg string) {
+	ted := &channelz.TraceEventDesc{
+		Desc:     fmt.Sprintf("Channel %s", msg),
+		Severity: channelz.CtInfo,
+	}
+	if cc.dopts.channelzParentID != nil {
+		ted.Parent = &channelz.TraceEventDesc{
+			Desc:     fmt.Sprintf("Nested channel(id:%d) %s", cc.channelzID.Int(), msg),
+			Severity: channelz.CtInfo,
+		}
+	}
+	channelz.AddTraceEvent(logger, cc.channelzID, 0, ted)
+}
+
+// exitIdleMode moves the channel out of idle mode by recreating the name
+// resolver and load balancer.
+func (cc *ClientConn) exitIdleMode() error {
+	cc.mu.Lock()
+	if cc.conns == nil {
+		cc.mu.Unlock()
+		return errConnClosing
+	}
+	if cc.idlenessState != ccIdlenessStateIdle {
+		cc.mu.Unlock()
+		logger.Info("ClientConn asked to exit idle mode when not in idle mode")
+		return nil
+	}
+
+	defer func() {
+		// When Close() and exitIdleMode() race against each other, one of the
+		// following two can happen:
+		// - Close() wins the race and runs first. exitIdleMode() runs after, and
+		//   sees that the ClientConn is already closed and hence returns early.
+		// - exitIdleMode() wins the race and runs first and recreates the balancer
+		//   and releases the lock before recreating the resolver. If Close() runs
+		//   in this window, it will wait for exitIdleMode to complete.
+		//
+		// We achieve this synchronization using the below condition variable.
+		cc.mu.Lock()
+		cc.idlenessState = ccIdlenessStateActive
+		cc.exitIdleCond.Signal()
+		cc.mu.Unlock()
+	}()
+
+	cc.idlenessState = ccIdlenessStateExitingIdle
+	exitedIdle := false
+	if cc.blockingpicker == nil {
+		cc.blockingpicker = newPickerWrapper()
+	} else {
+		cc.blockingpicker.exitIdleMode()
+		exitedIdle = true
+	}
+
 	var credsClone credentials.TransportCredentials
 	if creds := cc.dopts.copts.TransportCredentials; creds != nil {
 		credsClone = creds.Clone()
 	}
-	cc.balancerWrapper = newCCBalancerWrapper(cc, balancer.BuildOptions{
+	if cc.balancerWrapper == nil {
-		DialCreds:        credsClone,
+		cc.balancerWrapper = newCCBalancerWrapper(cc, balancer.BuildOptions{
-		CredsBundle:      cc.dopts.copts.CredsBundle,
+			DialCreds:        credsClone,
-		Dialer:           cc.dopts.copts.Dialer,
+			CredsBundle:      cc.dopts.copts.CredsBundle,
-		Authority:        cc.authority,
+			Dialer:           cc.dopts.copts.Dialer,
-		CustomUserAgent:  cc.dopts.copts.UserAgent,
+			Authority:        cc.authority,
-		ChannelzParentID: cc.channelzID,
+			CustomUserAgent:  cc.dopts.copts.UserAgent,
-		Target:           cc.parsedTarget,
+			ChannelzParentID: cc.channelzID,
-	})
+			Target:           cc.parsedTarget,
-
+		})
-	// Build the resolver.
+	} else {
-	rWrapper, err := newCCResolverWrapper(cc, resolverBuilder)
+		cc.balancerWrapper.exitIdleMode()
-	if err != nil {
-		return nil, fmt.Errorf("failed to build resolver: %v", err)
 	}
-	cc.mu.Lock()
+	cc.firstResolveEvent = grpcsync.NewEvent()
-	cc.resolverWrapper = rWrapper
 	cc.mu.Unlock()
 
-	// A blocking dial blocks until the clientConn is ready.
+	// This needs to be called without cc.mu because this builds a new resolver
-	if cc.dopts.block {
+	// which might update state or report error inline which needs to be handled
-		for {
+	// by cc.updateResolverState() which also grabs cc.mu.
-			cc.Connect()
+	if err := cc.initResolverWrapper(credsClone); err != nil {
-			s := cc.GetState()
+		return err
-			if s == connectivity.Ready {
+	}
-				break
+
-			} else if cc.dopts.copts.FailOnNonTempDialError && s == connectivity.TransientFailure {
+	if exitedIdle {
-				if err = cc.connectionError(); err != nil {
+		cc.addTraceEvent("exiting idle mode")
-					terr, ok := err.(interface {
+	}
-						Temporary() bool
+	return nil
-					})
+}
-					if ok && !terr.Temporary() {
+
-						return nil, err
+// enterIdleMode puts the channel in idle mode, and as part of it shuts down the
-					}
+// name resolver, load balancer and any subchannels.
-				}
+func (cc *ClientConn) enterIdleMode() error {
-			}
+	cc.mu.Lock()
-			if !cc.WaitForStateChange(ctx, s) {
+	if cc.conns == nil {
-				// ctx got timeout or canceled.
+		cc.mu.Unlock()
-				if err = cc.connectionError(); err != nil && cc.dopts.returnLastError {
+		return ErrClientConnClosing
-					return nil, err
+	}
-				}
+	if cc.idlenessState != ccIdlenessStateActive {
-				return nil, ctx.Err()
+		logger.Error("ClientConn asked to enter idle mode when not active")
+		return nil
+	}
+
+	// cc.conns == nil is a proxy for the ClientConn being closed. So, instead
+	// of setting it to nil here, we recreate the map. This also means that we
+	// don't have to do this when exiting idle mode.
+	conns := cc.conns
+	cc.conns = make(map[*addrConn]struct{})
+
+	// TODO: Currently, we close the resolver wrapper upon entering idle mode
+	// and create a new one upon exiting idle mode. This means that the
+	// `cc.resolverWrapper` field would be overwritten everytime we exit idle
+	// mode. While this means that we need to hold `cc.mu` when accessing
+	// `cc.resolverWrapper`, it makes the code simpler in the wrapper. We should
+	// try to do the same for the balancer and picker wrappers too.
+	cc.resolverWrapper.close()
+	cc.blockingpicker.enterIdleMode()
+	cc.balancerWrapper.enterIdleMode()
+	cc.csMgr.updateState(connectivity.Idle)
+	cc.idlenessState = ccIdlenessStateIdle
+	cc.mu.Unlock()
+
+	go func() {
+		cc.addTraceEvent("entering idle mode")
+		for ac := range conns {
+			ac.tearDown(errConnIdling)
+		}
+	}()
+	return nil
+}
+
+// validateTransportCredentials performs a series of checks on the configured
+// transport credentials. It returns a non-nil error if any of these conditions
+// are met:
+//   - no transport creds and no creds bundle is configured
+//   - both transport creds and creds bundle are configured
+//   - creds bundle is configured, but it lacks a transport credentials
+//   - insecure transport creds configured alongside call creds that require
+//     transport level security
+//
+// If none of the above conditions are met, the configured credentials are
+// deemed valid and a nil error is returned.
+func (cc *ClientConn) validateTransportCredentials() error {
+	if cc.dopts.copts.TransportCredentials == nil && cc.dopts.copts.CredsBundle == nil {
+		return errNoTransportSecurity
+	}
+	if cc.dopts.copts.TransportCredentials != nil && cc.dopts.copts.CredsBundle != nil {
+		return errTransportCredsAndBundle
+	}
+	if cc.dopts.copts.CredsBundle != nil && cc.dopts.copts.CredsBundle.TransportCredentials() == nil {
+		return errNoTransportCredsInBundle
+	}
+	transportCreds := cc.dopts.copts.TransportCredentials
+	if transportCreds == nil {
+		transportCreds = cc.dopts.copts.CredsBundle.TransportCredentials()
+	}
+	if transportCreds.Info().SecurityProtocol == "insecure" {
+		for _, cd := range cc.dopts.copts.PerRPCCredentials {
+			if cd.RequireTransportSecurity() {
+				return errTransportCredentialsMissing
 			}
 		}
 	}
+	return nil
+}
 
-	return cc, nil
+// channelzRegistration registers the newly created ClientConn with channelz and
+// stores the returned identifier in `cc.channelzID` and `cc.csMgr.channelzID`.
+// A channelz trace event is emitted for ClientConn creation. If the newly
+// created ClientConn is a nested one, i.e a valid parent ClientConn ID is
+// specified via a dial option, the trace event is also added to the parent.
+//
+// Doesn't grab cc.mu as this method is expected to be called only at Dial time.
+func (cc *ClientConn) channelzRegistration(target string) {
+	cc.channelzID = channelz.RegisterChannel(&channelzChannel{cc}, cc.dopts.channelzParentID, target)
+	cc.addTraceEvent("created")
+	cc.csMgr.channelzID = cc.channelzID
 }
 
 // chainUnaryClientInterceptors chains all unary client interceptors into one.
@@ -474,7 +620,9 @@ type ClientConn struct {
 	authority       string               // See determineAuthority().
 	dopts           dialOptions          // Default and user specified dial options.
 	channelzID      *channelz.Identifier // Channelz identifier for the channel.
+	resolverBuilder resolver.Builder     // See parseTargetAndFindResolver().
 	balancerWrapper *ccBalancerWrapper   // Uses gracefulswitch.balancer underneath.
+	idlenessMgr     idlenessManager
 
 	// The following provide their own synchronization, and therefore don't
 	// require cc.mu to be held to access them.
@@ -495,11 +643,31 @@ type ClientConn struct {
 	sc              *ServiceConfig             // Latest service config received from the resolver.
 	conns           map[*addrConn]struct{}     // Set to nil on close.
 	mkp             keepalive.ClientParameters // May be updated upon receipt of a GoAway.
+	idlenessState   ccIdlenessState            // Tracks idleness state of the channel.
+	exitIdleCond    *sync.Cond                 // Signalled when channel exits idle.
 
 	lceMu               sync.Mutex // protects lastConnectionError
 	lastConnectionError error
 }
 
+// ccIdlenessState tracks the idleness state of the channel.
+//
+// Channels start off in `active` and move to `idle` after a period of
+// inactivity. When moving back to `active` upon an incoming RPC, they
+// transition through `exiting_idle`. This state is useful for synchronization
+// with Close().
+//
+// This state tracking is mostly for self-protection. The idlenessManager is
+// expected to keep track of the state as well, and is expected not to call into
+// the ClientConn unnecessarily.
+type ccIdlenessState int8
+
+const (
+	ccIdlenessStateActive ccIdlenessState = iota
+	ccIdlenessStateIdle
+	ccIdlenessStateExitingIdle
+)
+
 // WaitForStateChange waits until the connectivity.State of ClientConn changes from sourceState or
 // ctx expires. A true value is returned in former case and false in latter.
 //
@@ -539,7 +707,10 @@ func (cc *ClientConn) GetState() connectivity.State {
 // Notice: This API is EXPERIMENTAL and may be changed or removed in a later
 // release.
 func (cc *ClientConn) Connect() {
-	cc.balancerWrapper.exitIdle()
+	cc.exitIdleMode()
+	// If the ClientConn was not in idle mode, we need to call ExitIdle on the
+	// LB policy so that connections can be created.
+	cc.balancerWrapper.exitIdleMode()
 }
 
 func (cc *ClientConn) scWatcher() {
@@ -708,6 +879,7 @@ func (cc *ClientConn) newAddrConn(addrs []resolver.Address, opts balancer.NewSub
 		dopts:        cc.dopts,
 		czData:       new(channelzData),
 		resetBackoff: make(chan struct{}),
+		stateChan:    make(chan struct{}),
 	}
 	ac.ctx, ac.cancel = context.WithCancel(cc.ctx)
 	// Track ac in cc. This needs to be done before any getTransport(...) is called.
@@ -801,9 +973,6 @@ func (ac *addrConn) connect() error {
 		ac.mu.Unlock()
 		return nil
 	}
-	// Update connectivity state within the lock to prevent subsequent or
-	// concurrent calls from resetting the transport more than once.
-	ac.updateConnectivityState(connectivity.Connecting, nil)
 	ac.mu.Unlock()
 
 	ac.resetTransport()
@@ -822,58 +991,62 @@ func equalAddresses(a, b []resolver.Address) bool {
 	return true
 }
 
-// tryUpdateAddrs tries to update ac.addrs with the new addresses list.
+// updateAddrs updates ac.addrs with the new addresses list and handles active
-//
+// connections or connection attempts.
-// If ac is TransientFailure, it updates ac.addrs and returns true. The updated
+func (ac *addrConn) updateAddrs(addrs []resolver.Address) {
-// addresses will be picked up by retry in the next iteration after backoff.
-//
-// If ac is Shutdown or Idle, it updates ac.addrs and returns true.
-//
-// If the addresses is the same as the old list, it does nothing and returns
-// true.
-//
-// If ac is Connecting, it returns false. The caller should tear down the ac and
-// create a new one. Note that the backoff will be reset when this happens.
-//
-// If ac is Ready, it checks whether current connected address of ac is in the
-// new addrs list.
-//   - If true, it updates ac.addrs and returns true. The ac will keep using
-//     the existing connection.
-//   - If false, it does nothing and returns false.
-func (ac *addrConn) tryUpdateAddrs(addrs []resolver.Address) bool {
 	ac.mu.Lock()
-	defer ac.mu.Unlock()
+	channelz.Infof(logger, ac.channelzID, "addrConn: updateAddrs curAddr: %v, addrs: %v", ac.curAddr, addrs)
-	channelz.Infof(logger, ac.channelzID, "addrConn: tryUpdateAddrs curAddr: %v, addrs: %v", ac.curAddr, addrs)
+
+	if equalAddresses(ac.addrs, addrs) {
+		ac.mu.Unlock()
+		return
+	}
+
+	ac.addrs = addrs
+
 	if ac.state == connectivity.Shutdown ||
 		ac.state == connectivity.TransientFailure ||
 		ac.state == connectivity.Idle {
-		ac.addrs = addrs
+		// We were not connecting, so do nothing but update the addresses.
-		return true
+		ac.mu.Unlock()
+		return
 	}
 
-	if equalAddresses(ac.addrs, addrs) {
+	if ac.state == connectivity.Ready {
-		return true
+		// Try to find the connected address.
-	}
+		for _, a := range addrs {
-
+			a.ServerName = ac.cc.getServerName(a)
-	if ac.state == connectivity.Connecting {
+			if a.Equal(ac.curAddr) {
-		return false
+				// We are connected to a valid address, so do nothing but
-	}
+				// update the addresses.
-
+				ac.mu.Unlock()
-	// ac.state is Ready, try to find the connected address.
+				return
-	var curAddrFound bool
+			}
-	for _, a := range addrs {
-		a.ServerName = ac.cc.getServerName(a)
-		if reflect.DeepEqual(ac.curAddr, a) {
-			curAddrFound = true
-			break
 		}
 	}
-	channelz.Infof(logger, ac.channelzID, "addrConn: tryUpdateAddrs curAddrFound: %v", curAddrFound)
+
-	if curAddrFound {
+	// We are either connected to the wrong address or currently connecting.
-		ac.addrs = addrs
+	// Stop the current iteration and restart.
+
+	ac.cancel()
+	ac.ctx, ac.cancel = context.WithCancel(ac.cc.ctx)
+
+	// We have to defer here because GracefulClose => Close => onClose, which
+	// requires locking ac.mu.
+	if ac.transport != nil {
+		defer ac.transport.GracefulClose()
+		ac.transport = nil
 	}
 
-	return curAddrFound
+	if len(addrs) == 0 {
+		ac.updateConnectivityState(connectivity.Idle, nil)
+	}
+
+	ac.mu.Unlock()
+
+	// Since we were connecting/connected, we should start a new connection
+	// attempt.
+	go ac.resetTransport()
 }
 
 // getServerName determines the serverName to be used in the connection
@@ -1026,39 +1199,40 @@ func (cc *ClientConn) Close() error {
 		cc.mu.Unlock()
 		return ErrClientConnClosing
 	}
+
+	for cc.idlenessState == ccIdlenessStateExitingIdle {
+		cc.exitIdleCond.Wait()
+	}
+
 	conns := cc.conns
 	cc.conns = nil
 	cc.csMgr.updateState(connectivity.Shutdown)
 
+	pWrapper := cc.blockingpicker
 	rWrapper := cc.resolverWrapper
-	cc.resolverWrapper = nil
 	bWrapper := cc.balancerWrapper
+	idlenessMgr := cc.idlenessMgr
 	cc.mu.Unlock()
 
 	// The order of closing matters here since the balancer wrapper assumes the
 	// picker is closed before it is closed.
-	cc.blockingpicker.close()
+	if pWrapper != nil {
+		pWrapper.close()
+	}
 	if bWrapper != nil {
 		bWrapper.close()
 	}
 	if rWrapper != nil {
 		rWrapper.close()
 	}
+	if idlenessMgr != nil {
+		idlenessMgr.close()
+	}
 
 	for ac := range conns {
 		ac.tearDown(ErrClientConnClosing)
 	}
-	ted := &channelz.TraceEventDesc{
+	cc.addTraceEvent("deleted")
-		Desc:     "Channel deleted",
-		Severity: channelz.CtInfo,
-	}
-	if cc.dopts.channelzParentID != nil {
-		ted.Parent = &channelz.TraceEventDesc{
-			Desc:     fmt.Sprintf("Nested channel(id:%d) deleted", cc.channelzID.Int()),
-			Severity: channelz.CtInfo,
-		}
-	}
-	channelz.AddTraceEvent(logger, cc.channelzID, 0, ted)
 	// TraceEvent needs to be called before RemoveEntry, as TraceEvent may add
 	// trace reference to the entity being deleted, and thus prevent it from being
 	// deleted right away.
@@ -1088,7 +1262,8 @@ type addrConn struct {
 	addrs   []resolver.Address // All addresses that the resolver resolved to.
 
 	// Use updateConnectivityState for updating addrConn's connectivity state.
-	state connectivity.State
+	state     connectivity.State
+	stateChan chan struct{} // closed and recreated on every state change.
 
 	backoffIdx   int // Needs to be stateful for resetConnectBackoff.
 	resetBackoff chan struct{}
@@ -1102,8 +1277,15 @@ func (ac *addrConn) updateConnectivityState(s connectivity.State, lastErr error)
 	if ac.state == s {
 		return
 	}
+	// When changing states, reset the state change channel.
+	close(ac.stateChan)
+	ac.stateChan = make(chan struct{})
 	ac.state = s
-	channelz.Infof(logger, ac.channelzID, "Subchannel Connectivity change to %v", s)
+	if lastErr == nil {
+		channelz.Infof(logger, ac.channelzID, "Subchannel Connectivity change to %v", s)
+	} else {
+		channelz.Infof(logger, ac.channelzID, "Subchannel Connectivity change to %v, last error: %s", s, lastErr)
+	}
 	ac.cc.handleSubConnStateChange(ac.acbw, s, lastErr)
 }
 
@@ -1123,7 +1305,8 @@ func (ac *addrConn) adjustParams(r transport.GoAwayReason) {
 
 func (ac *addrConn) resetTransport() {
 	ac.mu.Lock()
-	if ac.state == connectivity.Shutdown {
+	acCtx := ac.ctx
+	if acCtx.Err() != nil {
 		ac.mu.Unlock()
 		return
 	}
@@ -1151,15 +1334,14 @@ func (ac *addrConn) resetTransport() {
 	ac.updateConnectivityState(connectivity.Connecting, nil)
 	ac.mu.Unlock()
 
-	if err := ac.tryAllAddrs(addrs, connectDeadline); err != nil {
+	if err := ac.tryAllAddrs(acCtx, addrs, connectDeadline); err != nil {
 		ac.cc.resolveNow(resolver.ResolveNowOptions{})
 		// After exhausting all addresses, the addrConn enters
 		// TRANSIENT_FAILURE.
-		ac.mu.Lock()
+		if acCtx.Err() != nil {
-		if ac.state == connectivity.Shutdown {
-			ac.mu.Unlock()
 			return
 		}
+		ac.mu.Lock()
 		ac.updateConnectivityState(connectivity.TransientFailure, err)
 
 		// Backoff.
@@ -1174,13 +1356,13 @@ func (ac *addrConn) resetTransport() {
 			ac.mu.Unlock()
 		case <-b:
 			timer.Stop()
-		case <-ac.ctx.Done():
+		case <-acCtx.Done():
 			timer.Stop()
 			return
 		}
 
 		ac.mu.Lock()
-		if ac.state != connectivity.Shutdown {
+		if acCtx.Err() == nil {
 			ac.updateConnectivityState(connectivity.Idle, err)
 		}
 		ac.mu.Unlock()
@@ -1195,14 +1377,13 @@ func (ac *addrConn) resetTransport() {
 // tryAllAddrs tries to creates a connection to the addresses, and stop when at
 // the first successful one. It returns an error if no address was successfully
 // connected, or updates ac appropriately with the new transport.
-func (ac *addrConn) tryAllAddrs(addrs []resolver.Address, connectDeadline time.Time) error {
+func (ac *addrConn) tryAllAddrs(ctx context.Context, addrs []resolver.Address, connectDeadline time.Time) error {
 	var firstConnErr error
 	for _, addr := range addrs {
-		ac.mu.Lock()
+		if ctx.Err() != nil {
-		if ac.state == connectivity.Shutdown {
-			ac.mu.Unlock()
 			return errConnClosing
 		}
+		ac.mu.Lock()
 
 		ac.cc.mu.RLock()
 		ac.dopts.copts.KeepaliveParams = ac.cc.mkp
@@ -1216,7 +1397,7 @@ func (ac *addrConn) tryAllAddrs(addrs []resolver.Address, connectDeadline time.T
 
 		channelz.Infof(logger, ac.channelzID, "Subchannel picks a new address %q to connect", addr.Addr)
 
-		err := ac.createTransport(addr, copts, connectDeadline)
+		err := ac.createTransport(ctx, addr, copts, connectDeadline)
 		if err == nil {
 			return nil
 		}
@@ -1233,19 +1414,20 @@ func (ac *addrConn) tryAllAddrs(addrs []resolver.Address, connectDeadline time.T
 // createTransport creates a connection to addr. It returns an error if the
 // address was not successfully connected, or updates ac appropriately with the
 // new transport.
-func (ac *addrConn) createTransport(addr resolver.Address, copts transport.ConnectOptions, connectDeadline time.Time) error {
+func (ac *addrConn) createTransport(ctx context.Context, addr resolver.Address, copts transport.ConnectOptions, connectDeadline time.Time) error {
 	addr.ServerName = ac.cc.getServerName(addr)
-	hctx, hcancel := context.WithCancel(ac.ctx)
+	hctx, hcancel := context.WithCancel(ctx)
 
 	onClose := func(r transport.GoAwayReason) {
 		ac.mu.Lock()
 		defer ac.mu.Unlock()
 		// adjust params based on GoAwayReason
 		ac.adjustParams(r)
-		if ac.state == connectivity.Shutdown {
+		if ctx.Err() != nil {
-			// Already shut down.  tearDown() already cleared the transport and
+			// Already shut down or connection attempt canceled.  tearDown() or
-			// canceled hctx via ac.ctx, and we expected this connection to be
+			// updateAddrs() already cleared the transport and canceled hctx
-			// closed, so do nothing here.
+			// via ac.ctx, and we expected this connection to be closed, so do
+			// nothing here.
 			return
 		}
 		hcancel()
@@ -1264,7 +1446,7 @@ func (ac *addrConn) createTransport(addr resolver.Address, copts transport.Conne
 		ac.updateConnectivityState(connectivity.Idle, nil)
 	}
 
-	connectCtx, cancel := context.WithDeadline(ac.ctx, connectDeadline)
+	connectCtx, cancel := context.WithDeadline(ctx, connectDeadline)
 	defer cancel()
 	copts.ChannelzParentID = ac.channelzID
 
@@ -1281,7 +1463,7 @@ func (ac *addrConn) createTransport(addr resolver.Address, copts transport.Conne
 
 	ac.mu.Lock()
 	defer ac.mu.Unlock()
-	if ac.state == connectivity.Shutdown {
+	if ctx.Err() != nil {
 		// This can happen if the subConn was removed while in `Connecting`
 		// state. tearDown() would have set the state to `Shutdown`, but
 		// would not have closed the transport since ac.transport would not
@@ -1293,6 +1475,9 @@ func (ac *addrConn) createTransport(addr resolver.Address, copts transport.Conne
 		// The error we pass to Close() is immaterial since there are no open
 		// streams at this point, so no trailers with error details will be sent
 		// out. We just need to pass a non-nil error.
+		//
+		// This can also happen when updateAddrs is called during a connection
+		// attempt.
 		go newTr.Close(transport.ErrConnClosing)
 		return nil
 	}
@@ -1400,6 +1585,29 @@ func (ac *addrConn) getReadyTransport() transport.ClientTransport {
 	return nil
 }
 
+// getTransport waits until the addrconn is ready and returns the transport.
+// If the context expires first, returns an appropriate status.  If the
+// addrConn is stopped first, returns an Unavailable status error.
+func (ac *addrConn) getTransport(ctx context.Context) (transport.ClientTransport, error) {
+	for ctx.Err() == nil {
+		ac.mu.Lock()
+		t, state, sc := ac.transport, ac.state, ac.stateChan
+		ac.mu.Unlock()
+		if state == connectivity.Ready {
+			return t, nil
+		}
+		if state == connectivity.Shutdown {
+			return nil, status.Errorf(codes.Unavailable, "SubConn shutting down")
+		}
+
+		select {
+		case <-ctx.Done():
+		case <-sc:
+		}
+	}
+	return nil, status.FromContextError(ctx.Err()).Err()
+}
+
 // tearDown starts to tear down the addrConn.
 //
 // Note that tearDown doesn't remove ac from ac.cc.conns, so the addrConn struct
@@ -1527,6 +1735,9 @@ func (c *channelzChannel) ChannelzMetric() *channelz.ChannelInternalMetric {
 // referenced by users.
 var ErrClientConnTimeout = errors.New("grpc: timed out when dialing")
 
+// getResolver finds the scheme in the cc's resolvers or the global registry.
+// scheme should always be lowercase (typically by virtue of url.Parse()
+// performing proper RFC3986 behavior).
 func (cc *ClientConn) getResolver(scheme string) resolver.Builder {
 	for _, rb := range cc.dopts.resolvers {
 		if scheme == rb.Scheme() {
@@ -1548,7 +1759,14 @@ func (cc *ClientConn) connectionError() error {
 	return cc.lastConnectionError
 }
 
-func (cc *ClientConn) parseTargetAndFindResolver() (resolver.Builder, error) {
+// parseTargetAndFindResolver parses the user's dial target and stores the
+// parsed target in `cc.parsedTarget`.
+//
+// The resolver to use is determined based on the scheme in the parsed target
+// and the same is stored in `cc.resolverBuilder`.
+//
+// Doesn't grab cc.mu as this method is expected to be called only at Dial time.
+func (cc *ClientConn) parseTargetAndFindResolver() error {
 	channelz.Infof(logger, cc.channelzID, "original dial target is: %q", cc.target)
 
 	var rb resolver.Builder
@@ -1560,7 +1778,8 @@ func (cc *ClientConn) parseTargetAndFindResolver() (resolver.Builder, error) {
 		rb = cc.getResolver(parsedTarget.URL.Scheme)
 		if rb != nil {
 			cc.parsedTarget = parsedTarget
-			return rb, nil
+			cc.resolverBuilder = rb
+			return nil
 		}
 	}
 
@@ -1575,15 +1794,16 @@ func (cc *ClientConn) parseTargetAndFindResolver() (resolver.Builder, error) {
 	parsedTarget, err = parseTarget(canonicalTarget)
 	if err != nil {
 		channelz.Infof(logger, cc.channelzID, "dial target %q parse failed: %v", canonicalTarget, err)
-		return nil, err
+		return err
 	}
 	channelz.Infof(logger, cc.channelzID, "parsed dial target is: %+v", parsedTarget)
 	rb = cc.getResolver(parsedTarget.URL.Scheme)
 	if rb == nil {
-		return nil, fmt.Errorf("could not get resolver for default scheme: %q", parsedTarget.URL.Scheme)
+		return fmt.Errorf("could not get resolver for default scheme: %q", parsedTarget.URL.Scheme)
 	}
 	cc.parsedTarget = parsedTarget
-	return rb, nil
+	cc.resolverBuilder = rb
+	return nil
 }
 
 // parseTarget uses RFC 3986 semantics to parse the given target into a
@@ -1606,7 +1826,15 @@ func parseTarget(target string) (resolver.Target, error) {
 // - user specified authority override using `WithAuthority` dial option
 // - creds' notion of server name for the authentication handshake
 // - endpoint from dial target of the form "scheme://[authority]/endpoint"
-func determineAuthority(endpoint, target string, dopts dialOptions) (string, error) {
+//
+// Stores the determined authority in `cc.authority`.
+//
+// Returns a non-nil error if the authority returned by the transport
+// credentials do not match the authority configured through the dial option.
+//
+// Doesn't grab cc.mu as this method is expected to be called only at Dial time.
+func (cc *ClientConn) determineAuthority() error {
+	dopts := cc.dopts
 	// Historically, we had two options for users to specify the serverName or
 	// authority for a channel. One was through the transport credentials
 	// (either in its constructor, or through the OverrideServerName() method).
@@ -1623,25 +1851,58 @@ func determineAuthority(endpoint, target string, dopts dialOptions) (string, err
 	}
 	authorityFromDialOption := dopts.authority
 	if (authorityFromCreds != "" && authorityFromDialOption != "") && authorityFromCreds != authorityFromDialOption {
-		return "", fmt.Errorf("ClientConn's authority from transport creds %q and dial option %q don't match", authorityFromCreds, authorityFromDialOption)
+		return fmt.Errorf("ClientConn's authority from transport creds %q and dial option %q don't match", authorityFromCreds, authorityFromDialOption)
 	}
 
+	endpoint := cc.parsedTarget.Endpoint()
+	target := cc.target
 	switch {
 	case authorityFromDialOption != "":
-		return authorityFromDialOption, nil
+		cc.authority = authorityFromDialOption
 	case authorityFromCreds != "":
-		return authorityFromCreds, nil
+		cc.authority = authorityFromCreds
 	case strings.HasPrefix(target, "unix:") || strings.HasPrefix(target, "unix-abstract:"):
 		// TODO: remove when the unix resolver implements optional interface to
 		// return channel authority.
-		return "localhost", nil
+		cc.authority = "localhost"
 	case strings.HasPrefix(endpoint, ":"):
-		return "localhost" + endpoint, nil
+		cc.authority = "localhost" + endpoint
 	default:
 		// TODO: Define an optional interface on the resolver builder to return
 		// the channel authority given the user's dial target. For resolvers
 		// which don't implement this interface, we will use the endpoint from
 		// "scheme://authority/endpoint" as the default authority.
-		return endpoint, nil
+		cc.authority = endpoint
 	}
+	channelz.Infof(logger, cc.channelzID, "Channel authority set to %q", cc.authority)
+	return nil
+}
+
+// initResolverWrapper creates a ccResolverWrapper, which builds the name
+// resolver. This method grabs the lock to assign the newly built resolver
+// wrapper to the cc.resolverWrapper field.
+func (cc *ClientConn) initResolverWrapper(creds credentials.TransportCredentials) error {
+	rw, err := newCCResolverWrapper(cc, ccResolverWrapperOpts{
+		target:  cc.parsedTarget,
+		builder: cc.resolverBuilder,
+		bOpts: resolver.BuildOptions{
+			DisableServiceConfig: cc.dopts.disableServiceConfig,
+			DialCreds:            creds,
+			CredsBundle:          cc.dopts.copts.CredsBundle,
+			Dialer:               cc.dopts.copts.Dialer,
+		},
+		channelzID: cc.channelzID,
+	})
+	if err != nil {
+		return fmt.Errorf("failed to build resolver: %v", err)
+	}
+	// Resolver implementations may report state update or error inline when
+	// built (or right after), and this is handled in cc.updateResolverState.
+	// Also, an error from the resolver might lead to a re-resolution request
+	// from the balancer, which is handled in resolveNow() where
+	// `cc.resolverWrapper` is accessed. Hence, we need to hold the lock here.
+	cc.mu.Lock()
+	cc.resolverWrapper = rw
+	cc.mu.Unlock()
+	return nil
 }

vendor/google.golang.org/grpc/codes/code_string.go

@@ -18,7 +18,15 @@
 
 package codes
 
-import "strconv"
+import (
+	"strconv"
+
+	"google.golang.org/grpc/internal"
+)
+
+func init() {
+	internal.CanonicalString = canonicalString
+}
 
 func (c Code) String() string {
 	switch c {
@@ -60,3 +68,44 @@ func (c Code) String() string {
 		return "Code(" + strconv.FormatInt(int64(c), 10) + ")"
 	}
 }
+
+func canonicalString(c Code) string {
+	switch c {
+	case OK:
+		return "OK"
+	case Canceled:
+		return "CANCELLED"
+	case Unknown:
+		return "UNKNOWN"
+	case InvalidArgument:
+		return "INVALID_ARGUMENT"
+	case DeadlineExceeded:
+		return "DEADLINE_EXCEEDED"
+	case NotFound:
+		return "NOT_FOUND"
+	case AlreadyExists:
+		return "ALREADY_EXISTS"
+	case PermissionDenied:
+		return "PERMISSION_DENIED"
+	case ResourceExhausted:
+		return "RESOURCE_EXHAUSTED"
+	case FailedPrecondition:
+		return "FAILED_PRECONDITION"
+	case Aborted:
+		return "ABORTED"
+	case OutOfRange:
+		return "OUT_OF_RANGE"
+	case Unimplemented:
+		return "UNIMPLEMENTED"
+	case Internal:
+		return "INTERNAL"
+	case Unavailable:
+		return "UNAVAILABLE"
+	case DataLoss:
+		return "DATA_LOSS"
+	case Unauthenticated:
+		return "UNAUTHENTICATED"
+	default:
+		return "CODE(" + strconv.FormatInt(int64(c), 10) + ")"
+	}
+}

vendor/google.golang.org/grpc/credentials/alts/internal/handshaker/handshaker.go

@@ -138,7 +138,7 @@ func DefaultServerHandshakerOptions() *ServerHandshakerOptions {
 //       and server options (server options struct does not exist now. When
 //       caller can provide endpoints, it should be created.
 
-// altsHandshaker is used to complete a ALTS handshaking between client and
+// altsHandshaker is used to complete an ALTS handshake between client and
 // server. This handshaker talks to the ALTS handshaker service in the metadata
 // server.
 type altsHandshaker struct {
@@ -146,6 +146,8 @@ type altsHandshaker struct {
 	stream altsgrpc.HandshakerService_DoHandshakeClient
 	// the connection to the peer.
 	conn net.Conn
+	// a virtual connection to the ALTS handshaker service.
+	clientConn *grpc.ClientConn
 	// client handshake options.
 	clientOpts *ClientHandshakerOptions
 	// server handshake options.
@@ -154,39 +156,33 @@ type altsHandshaker struct {
 	side core.Side
 }
 
-// NewClientHandshaker creates a ALTS handshaker for GCP which contains an RPC
+// NewClientHandshaker creates a core.Handshaker that performs a client-side
-// stub created using the passed conn and used to talk to the ALTS Handshaker
+// ALTS handshake by acting as a proxy between the peer and the ALTS handshaker
 // service in the metadata server.
 func NewClientHandshaker(ctx context.Context, conn *grpc.ClientConn, c net.Conn, opts *ClientHandshakerOptions) (core.Handshaker, error) {
-	stream, err := altsgrpc.NewHandshakerServiceClient(conn).DoHandshake(ctx)
-	if err != nil {
-		return nil, err
-	}
 	return &altsHandshaker{
-		stream:     stream,
+		stream:     nil,
 		conn:       c,
+		clientConn: conn,
 		clientOpts: opts,
 		side:       core.ClientSide,
 	}, nil
 }
 
-// NewServerHandshaker creates a ALTS handshaker for GCP which contains an RPC
+// NewServerHandshaker creates a core.Handshaker that performs a server-side
-// stub created using the passed conn and used to talk to the ALTS Handshaker
+// ALTS handshake by acting as a proxy between the peer and the ALTS handshaker
 // service in the metadata server.
 func NewServerHandshaker(ctx context.Context, conn *grpc.ClientConn, c net.Conn, opts *ServerHandshakerOptions) (core.Handshaker, error) {
-	stream, err := altsgrpc.NewHandshakerServiceClient(conn).DoHandshake(ctx)
-	if err != nil {
-		return nil, err
-	}
 	return &altsHandshaker{
-		stream:     stream,
+		stream:     nil,
 		conn:       c,
+		clientConn: conn,
 		serverOpts: opts,
 		side:       core.ServerSide,
 	}, nil
 }
 
-// ClientHandshake starts and completes a client ALTS handshaking for GCP. Once
+// ClientHandshake starts and completes a client ALTS handshake for GCP. Once
 // done, ClientHandshake returns a secure connection.
 func (h *altsHandshaker) ClientHandshake(ctx context.Context) (net.Conn, credentials.AuthInfo, error) {
 	if !acquire() {
@@ -198,6 +194,16 @@ func (h *altsHandshaker) ClientHandshake(ctx context.Context) (net.Conn, credent
 		return nil, nil, errors.New("only handshakers created using NewClientHandshaker can perform a client handshaker")
 	}
 
+	// TODO(matthewstevenson88): Change unit tests to use public APIs so
+	// that h.stream can unconditionally be set based on h.clientConn.
+	if h.stream == nil {
+		stream, err := altsgrpc.NewHandshakerServiceClient(h.clientConn).DoHandshake(ctx)
+		if err != nil {
+			return nil, nil, fmt.Errorf("failed to establish stream to ALTS handshaker service: %v", err)
+		}
+		h.stream = stream
+	}
+
 	// Create target identities from service account list.
 	targetIdentities := make([]*altspb.Identity, 0, len(h.clientOpts.TargetServiceAccounts))
 	for _, account := range h.clientOpts.TargetServiceAccounts {
@@ -229,7 +235,7 @@ func (h *altsHandshaker) ClientHandshake(ctx context.Context) (net.Conn, credent
 	return conn, authInfo, nil
 }
 
-// ServerHandshake starts and completes a server ALTS handshaking for GCP. Once
+// ServerHandshake starts and completes a server ALTS handshake for GCP. Once
 // done, ServerHandshake returns a secure connection.
 func (h *altsHandshaker) ServerHandshake(ctx context.Context) (net.Conn, credentials.AuthInfo, error) {
 	if !acquire() {
@@ -241,6 +247,16 @@ func (h *altsHandshaker) ServerHandshake(ctx context.Context) (net.Conn, credent
 		return nil, nil, errors.New("only handshakers created using NewServerHandshaker can perform a server handshaker")
 	}
 
+	// TODO(matthewstevenson88): Change unit tests to use public APIs so
+	// that h.stream can unconditionally be set based on h.clientConn.
+	if h.stream == nil {
+		stream, err := altsgrpc.NewHandshakerServiceClient(h.clientConn).DoHandshake(ctx)
+		if err != nil {
+			return nil, nil, fmt.Errorf("failed to establish stream to ALTS handshaker service: %v", err)
+		}
+		h.stream = stream
+	}
+
 	p := make([]byte, frameLimit)
 	n, err := h.conn.Read(p)
 	if err != nil {
@@ -371,5 +387,7 @@ func (h *altsHandshaker) processUntilDone(resp *altspb.HandshakerResp, extra []b
 // Close terminates the Handshaker. It should be called when the caller obtains
 // the secure connection.
 func (h *altsHandshaker) Close() {
-	h.stream.CloseSend()
+	if h.stream != nil {
+		h.stream.CloseSend()
+	}
 }

vendor/google.golang.org/grpc/credentials/alts/internal/handshaker/service/service.go

@@ -58,3 +58,21 @@ func Dial(hsAddress string) (*grpc.ClientConn, error) {
 	}
 	return hsConn, nil
 }
+
+// CloseForTesting closes all open connections to the handshaker service.
+//
+// For testing purposes only.
+func CloseForTesting() error {
+	for _, hsConn := range hsConnMap {
+		if hsConn == nil {
+			continue
+		}
+		if err := hsConn.Close(); err != nil {
+			return err
+		}
+	}
+
+	// Reset the connection map.
+	hsConnMap = make(map[string]*grpc.ClientConn)
+	return nil
+}

vendor/google.golang.org/grpc/credentials/alts/internal/proto/grpc_gcp/altscontext.pb.go

@@ -17,8 +17,8 @@
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.28.1
+// 	protoc-gen-go v1.30.0
-// 	protoc        v3.14.0
+// 	protoc        v4.22.0
 // source: grpc/gcp/altscontext.proto
 
 package grpc_gcp

vendor/google.golang.org/grpc/credentials/alts/internal/proto/grpc_gcp/handshaker.pb.go

@@ -17,8 +17,8 @@
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.28.1
+// 	protoc-gen-go v1.30.0
-// 	protoc        v3.14.0
+// 	protoc        v4.22.0
 // source: grpc/gcp/handshaker.proto
 
 package grpc_gcp

vendor/google.golang.org/grpc/credentials/alts/internal/proto/grpc_gcp/handshaker_grpc.pb.go

@@ -17,8 +17,8 @@
 
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
 // versions:
-// - protoc-gen-go-grpc v1.2.0
+// - protoc-gen-go-grpc v1.3.0
-// - protoc             v3.14.0
+// - protoc             v4.22.0
 // source: grpc/gcp/handshaker.proto
 
 package grpc_gcp
@@ -35,6 +35,10 @@ import (
 // Requires gRPC-Go v1.32.0 or later.
 const _ = grpc.SupportPackageIsVersion7
 
+const (
+	HandshakerService_DoHandshake_FullMethodName = "/grpc.gcp.HandshakerService/DoHandshake"
+)
+
 // HandshakerServiceClient is the client API for HandshakerService service.
 //
 // For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
@@ -57,7 +61,7 @@ func NewHandshakerServiceClient(cc grpc.ClientConnInterface) HandshakerServiceCl
 }
 
 func (c *handshakerServiceClient) DoHandshake(ctx context.Context, opts ...grpc.CallOption) (HandshakerService_DoHandshakeClient, error) {
-	stream, err := c.cc.NewStream(ctx, &HandshakerService_ServiceDesc.Streams[0], "/grpc.gcp.HandshakerService/DoHandshake", opts...)
+	stream, err := c.cc.NewStream(ctx, &HandshakerService_ServiceDesc.Streams[0], HandshakerService_DoHandshake_FullMethodName, opts...)
 	if err != nil {
 		return nil, err
 	}

vendor/google.golang.org/grpc/credentials/alts/internal/proto/grpc_gcp/transport_security_common.pb.go

@@ -17,8 +17,8 @@
 
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.28.1
+// 	protoc-gen-go v1.30.0
-// 	protoc        v3.14.0
+// 	protoc        v4.22.0
 // source: grpc/gcp/transport_security_common.proto
 
 package grpc_gcp

vendor/google.golang.org/grpc/dialoptions.go

@@ -38,13 +38,14 @@ import (
 
 func init() {
 	internal.AddGlobalDialOptions = func(opt ...DialOption) {
-		extraDialOptions = append(extraDialOptions, opt...)
+		globalDialOptions = append(globalDialOptions, opt...)
 	}
 	internal.ClearGlobalDialOptions = func() {
-		extraDialOptions = nil
+		globalDialOptions = nil
 	}
 	internal.WithBinaryLogger = withBinaryLogger
 	internal.JoinDialOptions = newJoinDialOption
+	internal.DisableGlobalDialOptions = newDisableGlobalDialOptions
 }
 
 // dialOptions configure a Dial call. dialOptions are set by the DialOption
@@ -76,6 +77,7 @@ type dialOptions struct {
 	defaultServiceConfig        *ServiceConfig // defaultServiceConfig is parsed from defaultServiceConfigRawJSON.
 	defaultServiceConfigRawJSON *string
 	resolvers                   []resolver.Builder
+	idleTimeout                 time.Duration
 }
 
 // DialOption configures how we set up the connection.
@@ -83,7 +85,7 @@ type DialOption interface {
 	apply(*dialOptions)
 }
 
-var extraDialOptions []DialOption
+var globalDialOptions []DialOption
 
 // EmptyDialOption does not alter the dial configuration. It can be embedded in
 // another structure to build custom dial options.
@@ -96,6 +98,16 @@ type EmptyDialOption struct{}
 
 func (EmptyDialOption) apply(*dialOptions) {}
 
+type disableGlobalDialOptions struct{}
+
+func (disableGlobalDialOptions) apply(*dialOptions) {}
+
+// newDisableGlobalDialOptions returns a DialOption that prevents the ClientConn
+// from applying the global DialOptions (set via AddGlobalDialOptions).
+func newDisableGlobalDialOptions() DialOption {
+	return &disableGlobalDialOptions{}
+}
+
 // funcDialOption wraps a function that modifies dialOptions into an
 // implementation of the DialOption interface.
 type funcDialOption struct {
@@ -284,6 +296,9 @@ func withBackoff(bs internalbackoff.Strategy) DialOption {
 // WithBlock returns a DialOption which makes callers of Dial block until the
 // underlying connection is up. Without this, Dial returns immediately and
 // connecting the server happens in background.
+//
+// Use of this feature is not recommended.  For more information, please see:
+// https://github.com/grpc/grpc-go/blob/master/Documentation/anti-patterns.md
 func WithBlock() DialOption {
 	return newFuncDialOption(func(o *dialOptions) {
 		o.block = true
@@ -295,6 +310,9 @@ func WithBlock() DialOption {
 // the context.DeadlineExceeded error.
 // Implies WithBlock()
 //
+// Use of this feature is not recommended.  For more information, please see:
+// https://github.com/grpc/grpc-go/blob/master/Documentation/anti-patterns.md
+//
 // # Experimental
 //
 // Notice: This API is EXPERIMENTAL and may be changed or removed in a
@@ -437,6 +455,9 @@ func withBinaryLogger(bl binarylog.Logger) DialOption {
 // FailOnNonTempDialError only affects the initial dial, and does not do
 // anything useful unless you are also using WithBlock().
 //
+// Use of this feature is not recommended.  For more information, please see:
+// https://github.com/grpc/grpc-go/blob/master/Documentation/anti-patterns.md
+//
 // # Experimental
 //
 // Notice: This API is EXPERIMENTAL and may be changed or removed in a
@@ -635,3 +656,23 @@ func WithResolvers(rs ...resolver.Builder) DialOption {
 		o.resolvers = append(o.resolvers, rs...)
 	})
 }
+
+// WithIdleTimeout returns a DialOption that configures an idle timeout for the
+// channel. If the channel is idle for the configured timeout, i.e there are no
+// ongoing RPCs and no new RPCs are initiated, the channel will enter idle mode
+// and as a result the name resolver and load balancer will be shut down. The
+// channel will exit idle mode when the Connect() method is called or when an
+// RPC is initiated.
+//
+// By default this feature is disabled, which can also be explicitly configured
+// by passing zero to this function.
+//
+// # Experimental
+//
+// Notice: This API is EXPERIMENTAL and may be changed or removed in a
+// later release.
+func WithIdleTimeout(d time.Duration) DialOption {
+	return newFuncDialOption(func(o *dialOptions) {
+		o.idleTimeout = d
+	})
+}

vendor/google.golang.org/grpc/idle.go

@@ -0,0 +1,287 @@
+/*
+ *
+ * Copyright 2023 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpc
+
+import (
+	"fmt"
+	"math"
+	"sync"
+	"sync/atomic"
+	"time"
+)
+
+// For overriding in unit tests.
+var timeAfterFunc = func(d time.Duration, f func()) *time.Timer {
+	return time.AfterFunc(d, f)
+}
+
+// idlenessEnforcer is the functionality provided by grpc.ClientConn to enter
+// and exit from idle mode.
+type idlenessEnforcer interface {
+	exitIdleMode() error
+	enterIdleMode() error
+}
+
+// idlenessManager defines the functionality required to track RPC activity on a
+// channel.
+type idlenessManager interface {
+	onCallBegin() error
+	onCallEnd()
+	close()
+}
+
+type noopIdlenessManager struct{}
+
+func (noopIdlenessManager) onCallBegin() error { return nil }
+func (noopIdlenessManager) onCallEnd()         {}
+func (noopIdlenessManager) close()             {}
+
+// idlenessManagerImpl implements the idlenessManager interface. It uses atomic
+// operations to synchronize access to shared state and a mutex to guarantee
+// mutual exclusion in a critical section.
+type idlenessManagerImpl struct {
+	// State accessed atomically.
+	lastCallEndTime           int64 // Unix timestamp in nanos; time when the most recent RPC completed.
+	activeCallsCount          int32 // Count of active RPCs; -math.MaxInt32 means channel is idle or is trying to get there.
+	activeSinceLastTimerCheck int32 // Boolean; True if there was an RPC since the last timer callback.
+	closed                    int32 // Boolean; True when the manager is closed.
+
+	// Can be accessed without atomics or mutex since these are set at creation
+	// time and read-only after that.
+	enforcer idlenessEnforcer // Functionality provided by grpc.ClientConn.
+	timeout  int64            // Idle timeout duration nanos stored as an int64.
+
+	// idleMu is used to guarantee mutual exclusion in two scenarios:
+	// - Opposing intentions:
+	//   - a: Idle timeout has fired and handleIdleTimeout() is trying to put
+	//     the channel in idle mode because the channel has been inactive.
+	//   - b: At the same time an RPC is made on the channel, and onCallBegin()
+	//     is trying to prevent the channel from going idle.
+	// - Competing intentions:
+	//   - The channel is in idle mode and there are multiple RPCs starting at
+	//     the same time, all trying to move the channel out of idle. Only one
+	//     of them should succeed in doing so, while the other RPCs should
+	//     piggyback on the first one and be successfully handled.
+	idleMu       sync.RWMutex
+	actuallyIdle bool
+	timer        *time.Timer
+}
+
+// newIdlenessManager creates a new idleness manager implementation for the
+// given idle timeout.
+func newIdlenessManager(enforcer idlenessEnforcer, idleTimeout time.Duration) idlenessManager {
+	if idleTimeout == 0 {
+		return noopIdlenessManager{}
+	}
+
+	i := &idlenessManagerImpl{
+		enforcer: enforcer,
+		timeout:  int64(idleTimeout),
+	}
+	i.timer = timeAfterFunc(idleTimeout, i.handleIdleTimeout)
+	return i
+}
+
+// resetIdleTimer resets the idle timer to the given duration. This method
+// should only be called from the timer callback.
+func (i *idlenessManagerImpl) resetIdleTimer(d time.Duration) {
+	i.idleMu.Lock()
+	defer i.idleMu.Unlock()
+
+	if i.timer == nil {
+		// Only close sets timer to nil. We are done.
+		return
+	}
+
+	// It is safe to ignore the return value from Reset() because this method is
+	// only ever called from the timer callback, which means the timer has
+	// already fired.
+	i.timer.Reset(d)
+}
+
+// handleIdleTimeout is the timer callback that is invoked upon expiry of the
+// configured idle timeout. The channel is considered inactive if there are no
+// ongoing calls and no RPC activity since the last time the timer fired.
+func (i *idlenessManagerImpl) handleIdleTimeout() {
+	if i.isClosed() {
+		return
+	}
+
+	if atomic.LoadInt32(&i.activeCallsCount) > 0 {
+		i.resetIdleTimer(time.Duration(i.timeout))
+		return
+	}
+
+	// There has been activity on the channel since we last got here. Reset the
+	// timer and return.
+	if atomic.LoadInt32(&i.activeSinceLastTimerCheck) == 1 {
+		// Set the timer to fire after a duration of idle timeout, calculated
+		// from the time the most recent RPC completed.
+		atomic.StoreInt32(&i.activeSinceLastTimerCheck, 0)
+		i.resetIdleTimer(time.Duration(atomic.LoadInt64(&i.lastCallEndTime) + i.timeout - time.Now().UnixNano()))
+		return
+	}
+
+	// This CAS operation is extremely likely to succeed given that there has
+	// been no activity since the last time we were here.  Setting the
+	// activeCallsCount to -math.MaxInt32 indicates to onCallBegin() that the
+	// channel is either in idle mode or is trying to get there.
+	if !atomic.CompareAndSwapInt32(&i.activeCallsCount, 0, -math.MaxInt32) {
+		// This CAS operation can fail if an RPC started after we checked for
+		// activity at the top of this method, or one was ongoing from before
+		// the last time we were here. In both case, reset the timer and return.
+		i.resetIdleTimer(time.Duration(i.timeout))
+		return
+	}
+
+	// Now that we've set the active calls count to -math.MaxInt32, it's time to
+	// actually move to idle mode.
+	if i.tryEnterIdleMode() {
+		// Successfully entered idle mode. No timer needed until we exit idle.
+		return
+	}
+
+	// Failed to enter idle mode due to a concurrent RPC that kept the channel
+	// active, or because of an error from the channel. Undo the attempt to
+	// enter idle, and reset the timer to try again later.
+	atomic.AddInt32(&i.activeCallsCount, math.MaxInt32)
+	i.resetIdleTimer(time.Duration(i.timeout))
+}
+
+// tryEnterIdleMode instructs the channel to enter idle mode. But before
+// that, it performs a last minute check to ensure that no new RPC has come in,
+// making the channel active.
+//
+// Return value indicates whether or not the channel moved to idle mode.
+//
+// Holds idleMu which ensures mutual exclusion with exitIdleMode.
+func (i *idlenessManagerImpl) tryEnterIdleMode() bool {
+	i.idleMu.Lock()
+	defer i.idleMu.Unlock()
+
+	if atomic.LoadInt32(&i.activeCallsCount) != -math.MaxInt32 {
+		// We raced and lost to a new RPC. Very rare, but stop entering idle.
+		return false
+	}
+	if atomic.LoadInt32(&i.activeSinceLastTimerCheck) == 1 {
+		// An very short RPC could have come in (and also finished) after we
+		// checked for calls count and activity in handleIdleTimeout(), but
+		// before the CAS operation. So, we need to check for activity again.
+		return false
+	}
+
+	// No new RPCs have come in since we last set the active calls count value
+	// -math.MaxInt32 in the timer callback. And since we have the lock, it is
+	// safe to enter idle mode now.
+	if err := i.enforcer.enterIdleMode(); err != nil {
+		logger.Errorf("Failed to enter idle mode: %v", err)
+		return false
+	}
+
+	// Successfully entered idle mode.
+	i.actuallyIdle = true
+	return true
+}
+
+// onCallBegin is invoked at the start of every RPC.
+func (i *idlenessManagerImpl) onCallBegin() error {
+	if i.isClosed() {
+		return nil
+	}
+
+	if atomic.AddInt32(&i.activeCallsCount, 1) > 0 {
+		// Channel is not idle now. Set the activity bit and allow the call.
+		atomic.StoreInt32(&i.activeSinceLastTimerCheck, 1)
+		return nil
+	}
+
+	// Channel is either in idle mode or is in the process of moving to idle
+	// mode. Attempt to exit idle mode to allow this RPC.
+	if err := i.exitIdleMode(); err != nil {
+		// Undo the increment to calls count, and return an error causing the
+		// RPC to fail.
+		atomic.AddInt32(&i.activeCallsCount, -1)
+		return err
+	}
+
+	atomic.StoreInt32(&i.activeSinceLastTimerCheck, 1)
+	return nil
+}
+
+// exitIdleMode instructs the channel to exit idle mode.
+//
+// Holds idleMu which ensures mutual exclusion with tryEnterIdleMode.
+func (i *idlenessManagerImpl) exitIdleMode() error {
+	i.idleMu.Lock()
+	defer i.idleMu.Unlock()
+
+	if !i.actuallyIdle {
+		// This can happen in two scenarios:
+		// - handleIdleTimeout() set the calls count to -math.MaxInt32 and called
+		//   tryEnterIdleMode(). But before the latter could grab the lock, an RPC
+		//   came in and onCallBegin() noticed that the calls count is negative.
+		// - Channel is in idle mode, and multiple new RPCs come in at the same
+		//   time, all of them notice a negative calls count in onCallBegin and get
+		//   here. The first one to get the lock would got the channel to exit idle.
+		//
+		// Either way, nothing to do here.
+		return nil
+	}
+
+	if err := i.enforcer.exitIdleMode(); err != nil {
+		return fmt.Errorf("channel failed to exit idle mode: %v", err)
+	}
+
+	// Undo the idle entry process. This also respects any new RPC attempts.
+	atomic.AddInt32(&i.activeCallsCount, math.MaxInt32)
+	i.actuallyIdle = false
+
+	// Start a new timer to fire after the configured idle timeout.
+	i.timer = timeAfterFunc(time.Duration(i.timeout), i.handleIdleTimeout)
+	return nil
+}
+
+// onCallEnd is invoked at the end of every RPC.
+func (i *idlenessManagerImpl) onCallEnd() {
+	if i.isClosed() {
+		return
+	}
+
+	// Record the time at which the most recent call finished.
+	atomic.StoreInt64(&i.lastCallEndTime, time.Now().UnixNano())
+
+	// Decrement the active calls count. This count can temporarily go negative
+	// when the timer callback is in the process of moving the channel to idle
+	// mode, but one or more RPCs come in and complete before the timer callback
+	// can get done with the process of moving to idle mode.
+	atomic.AddInt32(&i.activeCallsCount, -1)
+}
+
+func (i *idlenessManagerImpl) isClosed() bool {
+	return atomic.LoadInt32(&i.closed) == 1
+}
+
+func (i *idlenessManagerImpl) close() {
+	atomic.StoreInt32(&i.closed, 1)
+
+	i.idleMu.Lock()
+	i.timer.Stop()
+	i.timer = nil
+	i.idleMu.Unlock()
+}

vendor/google.golang.org/grpc/internal/binarylog/binarylog.go

@@ -28,8 +28,13 @@ import (
 	"google.golang.org/grpc/internal/grpcutil"
 )
 
-// Logger is the global binary logger. It can be used to get binary logger for
+var grpclogLogger = grpclog.Component("binarylog")
-// each method.
+
+// Logger specifies MethodLoggers for method names with a Log call that
+// takes a context.
+//
+// This is used in the 1.0 release of gcp/observability, and thus must not be
+// deleted or changed.
 type Logger interface {
 	GetMethodLogger(methodName string) MethodLogger
 }
@@ -40,8 +45,6 @@ type Logger interface {
 // It is used to get a MethodLogger for each individual method.
 var binLogger Logger
 
-var grpclogLogger = grpclog.Component("binarylog")
-
 // SetLogger sets the binary logger.
 //
 // Only call this at init time.

vendor/google.golang.org/grpc/internal/binarylog/method_logger.go

@@ -19,6 +19,7 @@
 package binarylog
 
 import (
+	"context"
 	"net"
 	"strings"
 	"sync/atomic"
@@ -48,8 +49,11 @@ func (g *callIDGenerator) reset() {
 var idGen callIDGenerator
 
 // MethodLogger is the sub-logger for each method.
+//
+// This is used in the 1.0 release of gcp/observability, and thus must not be
+// deleted or changed.
 type MethodLogger interface {
-	Log(LogEntryConfig)
+	Log(context.Context, LogEntryConfig)
 }
 
 // TruncatingMethodLogger is a method logger that truncates headers and messages
@@ -64,6 +68,9 @@ type TruncatingMethodLogger struct {
 }
 
 // NewTruncatingMethodLogger returns a new truncating method logger.
+//
+// This is used in the 1.0 release of gcp/observability, and thus must not be
+// deleted or changed.
 func NewTruncatingMethodLogger(h, m uint64) *TruncatingMethodLogger {
 	return &TruncatingMethodLogger{
 		headerMaxLen:  h,
@@ -98,7 +105,7 @@ func (ml *TruncatingMethodLogger) Build(c LogEntryConfig) *binlogpb.GrpcLogEntry
 }
 
 // Log creates a proto binary log entry, and logs it to the sink.
-func (ml *TruncatingMethodLogger) Log(c LogEntryConfig) {
+func (ml *TruncatingMethodLogger) Log(ctx context.Context, c LogEntryConfig) {
 	ml.sink.Write(ml.Build(c))
 }
 
@@ -144,6 +151,9 @@ func (ml *TruncatingMethodLogger) truncateMessage(msgPb *binlogpb.Message) (trun
 }
 
 // LogEntryConfig represents the configuration for binary log entry.
+//
+// This is used in the 1.0 release of gcp/observability, and thus must not be
+// deleted or changed.
 type LogEntryConfig interface {
 	toProto() *binlogpb.GrpcLogEntry
 }

vendor/google.golang.org/grpc/internal/buffer/unbounded.go

@@ -35,6 +35,7 @@ import "sync"
 // internal/transport/transport.go for an example of this.
 type Unbounded struct {
 	c       chan interface{}
+	closed  bool
 	mu      sync.Mutex
 	backlog []interface{}
 }
@@ -47,16 +48,18 @@ func NewUnbounded() *Unbounded {
 // Put adds t to the unbounded buffer.
 func (b *Unbounded) Put(t interface{}) {
 	b.mu.Lock()
+	defer b.mu.Unlock()
+	if b.closed {
+		return
+	}
 	if len(b.backlog) == 0 {
 		select {
 		case b.c <- t:
-			b.mu.Unlock()
 			return
 		default:
 		}
 	}
 	b.backlog = append(b.backlog, t)
-	b.mu.Unlock()
 }
 
 // Load sends the earliest buffered data, if any, onto the read channel
@@ -64,6 +67,10 @@ func (b *Unbounded) Put(t interface{}) {
 // value from the read channel.
 func (b *Unbounded) Load() {
 	b.mu.Lock()
+	defer b.mu.Unlock()
+	if b.closed {
+		return
+	}
 	if len(b.backlog) > 0 {
 		select {
 		case b.c <- b.backlog[0]:
@@ -72,7 +79,6 @@ func (b *Unbounded) Load() {
 		default:
 		}
 	}
-	b.mu.Unlock()
 }
 
 // Get returns a read channel on which values added to the buffer, via Put(),
@@ -80,6 +86,20 @@ func (b *Unbounded) Load() {
 //
 // Upon reading a value from this channel, users are expected to call Load() to
 // send the next buffered value onto the channel if there is any.
+//
+// If the unbounded buffer is closed, the read channel returned by this method
+// is closed.
 func (b *Unbounded) Get() <-chan interface{} {
 	return b.c
 }
+
+// Close closes the unbounded buffer.
+func (b *Unbounded) Close() {
+	b.mu.Lock()
+	defer b.mu.Unlock()
+	if b.closed {
+		return
+	}
+	b.closed = true
+	close(b.c)
+}

vendor/google.golang.org/grpc/internal/envconfig/envconfig.go

@@ -36,6 +36,10 @@ var (
 	// "GRPC_RING_HASH_CAP".  This does not override the default bounds
 	// checking which NACKs configs specifying ring sizes > 8*1024*1024 (~8M).
 	RingHashCap = uint64FromEnv("GRPC_RING_HASH_CAP", 4096, 1, 8*1024*1024)
+	// PickFirstLBConfig is set if we should support configuration of the
+	// pick_first LB policy, which can be enabled by setting the environment
+	// variable "GRPC_EXPERIMENTAL_PICKFIRST_LB_CONFIG" to "true".
+	PickFirstLBConfig = boolFromEnv("GRPC_EXPERIMENTAL_PICKFIRST_LB_CONFIG", false)
 )
 
 func boolFromEnv(envVar string, def bool) bool {

vendor/google.golang.org/grpc/internal/envconfig/observability.go

@@ -28,9 +28,15 @@ const (
 var (
 	// ObservabilityConfig is the json configuration for the gcp/observability
 	// package specified directly in the envObservabilityConfig env var.
+	//
+	// This is used in the 1.0 release of gcp/observability, and thus must not be
+	// deleted or changed.
 	ObservabilityConfig = os.Getenv(envObservabilityConfig)
 	// ObservabilityConfigFile is the json configuration for the
 	// gcp/observability specified in a file with the location specified in
 	// envObservabilityConfigFile env var.
+	//
+	// This is used in the 1.0 release of gcp/observability, and thus must not be
+	// deleted or changed.
 	ObservabilityConfigFile = os.Getenv(envObservabilityConfigFile)
 )

vendor/google.golang.org/grpc/internal/envconfig/xds.go

@@ -61,11 +61,10 @@ var (
 	// have a brand new API on the server-side and users explicitly need to use
 	// the new API to get security integration on the server.
 	XDSClientSideSecurity = boolFromEnv("GRPC_XDS_EXPERIMENTAL_SECURITY_SUPPORT", true)
-	// XDSAggregateAndDNS indicates whether processing of aggregated cluster
+	// XDSAggregateAndDNS indicates whether processing of aggregated cluster and
-	// and DNS cluster is enabled, which can be enabled by setting the
+	// DNS cluster is enabled, which can be disabled by setting the environment
-	// environment variable
+	// variable "GRPC_XDS_EXPERIMENTAL_ENABLE_AGGREGATE_AND_LOGICAL_DNS_CLUSTER"
-	// "GRPC_XDS_EXPERIMENTAL_ENABLE_AGGREGATE_AND_LOGICAL_DNS_CLUSTER" to
+	// to "false".
-	// "true".
 	XDSAggregateAndDNS = boolFromEnv("GRPC_XDS_EXPERIMENTAL_ENABLE_AGGREGATE_AND_LOGICAL_DNS_CLUSTER", true)
 
 	// XDSRBAC indicates whether xDS configured RBAC HTTP Filter is enabled,
@@ -79,14 +78,18 @@ var (
 	// XDSFederation indicates whether federation support is enabled, which can
 	// be enabled by setting the environment variable
 	// "GRPC_EXPERIMENTAL_XDS_FEDERATION" to "true".
-	XDSFederation = boolFromEnv("GRPC_EXPERIMENTAL_XDS_FEDERATION", false)
+	XDSFederation = boolFromEnv("GRPC_EXPERIMENTAL_XDS_FEDERATION", true)
 
 	// XDSRLS indicates whether processing of Cluster Specifier plugins and
-	// support for the RLS CLuster Specifier is enabled, which can be enabled by
+	// support for the RLS CLuster Specifier is enabled, which can be disabled by
 	// setting the environment variable "GRPC_EXPERIMENTAL_XDS_RLS_LB" to
-	// "true".
+	// "false".
-	XDSRLS = boolFromEnv("GRPC_EXPERIMENTAL_XDS_RLS_LB", false)
+	XDSRLS = boolFromEnv("GRPC_EXPERIMENTAL_XDS_RLS_LB", true)
 
 	// C2PResolverTestOnlyTrafficDirectorURI is the TD URI for testing.
 	C2PResolverTestOnlyTrafficDirectorURI = os.Getenv("GRPC_TEST_ONLY_GOOGLE_C2P_RESOLVER_TRAFFIC_DIRECTOR_URI")
+	// XDSCustomLBPolicy indicates whether Custom LB Policies are enabled, which
+	// can be disabled by setting the environment variable
+	// "GRPC_EXPERIMENTAL_XDS_CUSTOM_LB_CONFIG" to "false".
+	XDSCustomLBPolicy = boolFromEnv("GRPC_EXPERIMENTAL_XDS_CUSTOM_LB_CONFIG", true)
 )

vendor/google.golang.org/grpc/internal/grpclog/prefixLogger.go

@@ -63,6 +63,9 @@ func (pl *PrefixLogger) Errorf(format string, args ...interface{}) {
 
 // Debugf does info logging at verbose level 2.
 func (pl *PrefixLogger) Debugf(format string, args ...interface{}) {
+	// TODO(6044): Refactor interfaces LoggerV2 and DepthLogger, and maybe
+	// rewrite PrefixLogger a little to ensure that we don't use the global
+	// `Logger` here, and instead use the `logger` field.
 	if !Logger.V(2) {
 		return
 	}
@@ -73,6 +76,15 @@ func (pl *PrefixLogger) Debugf(format string, args ...interface{}) {
 		return
 	}
 	InfoDepth(1, fmt.Sprintf(format, args...))
+
+}
+
+// V reports whether verbosity level l is at least the requested verbose level.
+func (pl *PrefixLogger) V(l int) bool {
+	// TODO(6044): Refactor interfaces LoggerV2 and DepthLogger, and maybe
+	// rewrite PrefixLogger a little to ensure that we don't use the global
+	// `Logger` here, and instead use the `logger` field.
+	return Logger.V(l)
 }
 
 // NewPrefixLogger creates a prefix logger with the given prefix.

vendor/google.golang.org/grpc/internal/grpcrand/grpcrand.go

@@ -72,3 +72,17 @@ func Uint64() uint64 {
 	defer mu.Unlock()
 	return r.Uint64()
 }
+
+// Uint32 implements rand.Uint32 on the grpcrand global source.
+func Uint32() uint32 {
+	mu.Lock()
+	defer mu.Unlock()
+	return r.Uint32()
+}
+
+// Shuffle implements rand.Shuffle on the grpcrand global source.
+var Shuffle = func(n int, f func(int, int)) {
+	mu.Lock()
+	defer mu.Unlock()
+	r.Shuffle(n, f)
+}

vendor/google.golang.org/grpc/internal/grpcsync/callback_serializer.go

@@ -0,0 +1,119 @@
+/*
+ *
+ * Copyright 2022 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package grpcsync
+
+import (
+	"context"
+	"sync"
+
+	"google.golang.org/grpc/internal/buffer"
+)
+
+// CallbackSerializer provides a mechanism to schedule callbacks in a
+// synchronized manner. It provides a FIFO guarantee on the order of execution
+// of scheduled callbacks. New callbacks can be scheduled by invoking the
+// Schedule() method.
+//
+// This type is safe for concurrent access.
+type CallbackSerializer struct {
+	// Done is closed once the serializer is shut down completely, i.e all
+	// scheduled callbacks are executed and the serializer has deallocated all
+	// its resources.
+	Done chan struct{}
+
+	callbacks *buffer.Unbounded
+	closedMu  sync.Mutex
+	closed    bool
+}
+
+// NewCallbackSerializer returns a new CallbackSerializer instance. The provided
+// context will be passed to the scheduled callbacks. Users should cancel the
+// provided context to shutdown the CallbackSerializer. It is guaranteed that no
+// callbacks will be added once this context is canceled, and any pending un-run
+// callbacks will be executed before the serializer is shut down.
+func NewCallbackSerializer(ctx context.Context) *CallbackSerializer {
+	t := &CallbackSerializer{
+		Done:      make(chan struct{}),
+		callbacks: buffer.NewUnbounded(),
+	}
+	go t.run(ctx)
+	return t
+}
+
+// Schedule adds a callback to be scheduled after existing callbacks are run.
+//
+// Callbacks are expected to honor the context when performing any blocking
+// operations, and should return early when the context is canceled.
+//
+// Return value indicates if the callback was successfully added to the list of
+// callbacks to be executed by the serializer. It is not possible to add
+// callbacks once the context passed to NewCallbackSerializer is cancelled.
+func (t *CallbackSerializer) Schedule(f func(ctx context.Context)) bool {
+	t.closedMu.Lock()
+	defer t.closedMu.Unlock()
+
+	if t.closed {
+		return false
+	}
+	t.callbacks.Put(f)
+	return true
+}
+
+func (t *CallbackSerializer) run(ctx context.Context) {
+	var backlog []func(context.Context)
+
+	defer close(t.Done)
+	for ctx.Err() == nil {
+		select {
+		case <-ctx.Done():
+			// Do nothing here. Next iteration of the for loop will not happen,
+			// since ctx.Err() would be non-nil.
+		case callback, ok := <-t.callbacks.Get():
+			if !ok {
+				return
+			}
+			t.callbacks.Load()
+			callback.(func(ctx context.Context))(ctx)
+		}
+	}
+
+	// Fetch pending callbacks if any, and execute them before returning from
+	// this method and closing t.Done.
+	t.closedMu.Lock()
+	t.closed = true
+	backlog = t.fetchPendingCallbacks()
+	t.callbacks.Close()
+	t.closedMu.Unlock()
+	for _, b := range backlog {
+		b(ctx)
+	}
+}
+
+func (t *CallbackSerializer) fetchPendingCallbacks() []func(context.Context) {
+	var backlog []func(context.Context)
+	for {
+		select {
+		case b := <-t.callbacks.Get():
+			backlog = append(backlog, b.(func(context.Context)))
+			t.callbacks.Load()
+		default:
+			return backlog
+		}
+	}
+}

vendor/google.golang.org/grpc/internal/internal.go

@@ -58,6 +58,12 @@ var (
 	// gRPC server. An xDS-enabled server needs to know what type of credentials
 	// is configured on the underlying gRPC server. This is set by server.go.
 	GetServerCredentials interface{} // func (*grpc.Server) credentials.TransportCredentials
+	// CanonicalString returns the canonical string of the code defined here:
+	// https://github.com/grpc/grpc/blob/master/doc/statuscodes.md.
+	//
+	// This is used in the 1.0 release of gcp/observability, and thus must not be
+	// deleted or changed.
+	CanonicalString interface{} // func (codes.Code) string
 	// DrainServerTransports initiates a graceful close of existing connections
 	// on a gRPC server accepted on the provided listener address. An
 	// xDS-enabled server invokes this method on a grpc.Server when a particular
@@ -66,16 +72,35 @@ var (
 	// AddGlobalServerOptions adds an array of ServerOption that will be
 	// effective globally for newly created servers. The priority will be: 1.
 	// user-provided; 2. this method; 3. default values.
+	//
+	// This is used in the 1.0 release of gcp/observability, and thus must not be
+	// deleted or changed.
 	AddGlobalServerOptions interface{} // func(opt ...ServerOption)
 	// ClearGlobalServerOptions clears the array of extra ServerOption. This
 	// method is useful in testing and benchmarking.
+	//
+	// This is used in the 1.0 release of gcp/observability, and thus must not be
+	// deleted or changed.
 	ClearGlobalServerOptions func()
 	// AddGlobalDialOptions adds an array of DialOption that will be effective
 	// globally for newly created client channels. The priority will be: 1.
 	// user-provided; 2. this method; 3. default values.
+	//
+	// This is used in the 1.0 release of gcp/observability, and thus must not be
+	// deleted or changed.
 	AddGlobalDialOptions interface{} // func(opt ...DialOption)
+	// DisableGlobalDialOptions returns a DialOption that prevents the
+	// ClientConn from applying the global DialOptions (set via
+	// AddGlobalDialOptions).
+	//
+	// This is used in the 1.0 release of gcp/observability, and thus must not be
+	// deleted or changed.
+	DisableGlobalDialOptions interface{} // func() grpc.DialOption
 	// ClearGlobalDialOptions clears the array of extra DialOption. This
 	// method is useful in testing and benchmarking.
+	//
+	// This is used in the 1.0 release of gcp/observability, and thus must not be
+	// deleted or changed.
 	ClearGlobalDialOptions func()
 	// JoinDialOptions combines the dial options passed as arguments into a
 	// single dial option.
@@ -86,9 +111,15 @@ var (
 
 	// WithBinaryLogger returns a DialOption that specifies the binary logger
 	// for a ClientConn.
+	//
+	// This is used in the 1.0 release of gcp/observability, and thus must not be
+	// deleted or changed.
 	WithBinaryLogger interface{} // func(binarylog.Logger) grpc.DialOption
 	// BinaryLogger returns a ServerOption that can set the binary logger for a
 	// server.
+	//
+	// This is used in the 1.0 release of gcp/observability, and thus must not be
+	// deleted or changed.
 	BinaryLogger interface{} // func(binarylog.Logger) grpc.ServerOption
 
 	// NewXDSResolverWithConfigForTesting creates a new xds resolver builder using
@@ -130,6 +161,9 @@ var (
 	//
 	// TODO: Remove this function once the RBAC env var is removed.
 	UnregisterRBACHTTPFilterForTesting func()
+
+	// ORCAAllowAnyMinReportingInterval is for examples/orca use ONLY.
+	ORCAAllowAnyMinReportingInterval interface{} // func(so *orca.ServiceOptions)
 )
 
 // HealthChecker defines the signature of the client-side LB channel health checking function.

vendor/google.golang.org/grpc/internal/metadata/metadata.go

@@ -76,33 +76,11 @@ func Set(addr resolver.Address, md metadata.MD) resolver.Address {
 	return addr
 }
 
-// Validate returns an error if the input md contains invalid keys or values.
+// Validate validates every pair in md with ValidatePair.
-//
-// If the header is not a pseudo-header, the following items are checked:
-// - header names must contain one or more characters from this set [0-9 a-z _ - .].
-// - if the header-name ends with a "-bin" suffix, no validation of the header value is performed.
-// - otherwise, the header value must contain one or more characters from the set [%x20-%x7E].
 func Validate(md metadata.MD) error {
 	for k, vals := range md {
-		// pseudo-header will be ignored
+		if err := ValidatePair(k, vals...); err != nil {
-		if k[0] == ':' {
+			return err
-			continue
-		}
-		// check key, for i that saving a conversion if not using for range
-		for i := 0; i < len(k); i++ {
-			r := k[i]
-			if !(r >= 'a' && r <= 'z') && !(r >= '0' && r <= '9') && r != '.' && r != '-' && r != '_' {
-				return fmt.Errorf("header key %q contains illegal characters not in [0-9a-z-_.]", k)
-			}
-		}
-		if strings.HasSuffix(k, "-bin") {
-			continue
-		}
-		// check value
-		for _, val := range vals {
-			if hasNotPrintable(val) {
-				return fmt.Errorf("header key %q contains value with non-printable ASCII characters", k)
-			}
 		}
 	}
 	return nil
@@ -118,3 +96,37 @@ func hasNotPrintable(msg string) bool {
 	}
 	return false
 }
+
+// ValidatePair validate a key-value pair with the following rules (the pseudo-header will be skipped) :
+//
+// - key must contain one or more characters.
+// - the characters in the key must be contained in [0-9 a-z _ - .].
+// - if the key ends with a "-bin" suffix, no validation of the corresponding value is performed.
+// - the characters in the every value must be printable (in [%x20-%x7E]).
+func ValidatePair(key string, vals ...string) error {
+	// key should not be empty
+	if key == "" {
+		return fmt.Errorf("there is an empty key in the header")
+	}
+	// pseudo-header will be ignored
+	if key[0] == ':' {
+		return nil
+	}
+	// check key, for i that saving a conversion if not using for range
+	for i := 0; i < len(key); i++ {
+		r := key[i]
+		if !(r >= 'a' && r <= 'z') && !(r >= '0' && r <= '9') && r != '.' && r != '-' && r != '_' {
+			return fmt.Errorf("header key %q contains illegal characters not in [0-9a-z-_.]", key)
+		}
+	}
+	if strings.HasSuffix(key, "-bin") {
+		return nil
+	}
+	// check value
+	for _, val := range vals {
+		if hasNotPrintable(val) {
+			return fmt.Errorf("header key %q contains value with non-printable ASCII characters", key)
+		}
+	}
+	return nil
+}

vendor/google.golang.org/grpc/internal/serviceconfig/duration.go

@@ -0,0 +1,130 @@
+/*
+ *
+ * Copyright 2023 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package serviceconfig
+
+import (
+	"encoding/json"
+	"fmt"
+	"math"
+	"strconv"
+	"strings"
+	"time"
+)
+
+// Duration defines JSON marshal and unmarshal methods to conform to the
+// protobuf JSON spec defined [here].
+//
+// [here]: https://protobuf.dev/reference/protobuf/google.protobuf/#duration
+type Duration time.Duration
+
+func (d Duration) String() string {
+	return fmt.Sprint(time.Duration(d))
+}
+
+// MarshalJSON converts from d to a JSON string output.
+func (d Duration) MarshalJSON() ([]byte, error) {
+	ns := time.Duration(d).Nanoseconds()
+	sec := ns / int64(time.Second)
+	ns = ns % int64(time.Second)
+
+	var sign string
+	if sec < 0 || ns < 0 {
+		sign, sec, ns = "-", -1*sec, -1*ns
+	}
+
+	// Generated output always contains 0, 3, 6, or 9 fractional digits,
+	// depending on required precision.
+	str := fmt.Sprintf("%s%d.%09d", sign, sec, ns)
+	str = strings.TrimSuffix(str, "000")
+	str = strings.TrimSuffix(str, "000")
+	str = strings.TrimSuffix(str, ".000")
+	return []byte(fmt.Sprintf("\"%ss\"", str)), nil
+}
+
+// UnmarshalJSON unmarshals b as a duration JSON string into d.
+func (d *Duration) UnmarshalJSON(b []byte) error {
+	var s string
+	if err := json.Unmarshal(b, &s); err != nil {
+		return err
+	}
+	if !strings.HasSuffix(s, "s") {
+		return fmt.Errorf("malformed duration %q: missing seconds unit", s)
+	}
+	neg := false
+	if s[0] == '-' {
+		neg = true
+		s = s[1:]
+	}
+	ss := strings.SplitN(s[:len(s)-1], ".", 3)
+	if len(ss) > 2 {
+		return fmt.Errorf("malformed duration %q: too many decimals", s)
+	}
+	// hasDigits is set if either the whole or fractional part of the number is
+	// present, since both are optional but one is required.
+	hasDigits := false
+	var sec, ns int64
+	if len(ss[0]) > 0 {
+		var err error
+		if sec, err = strconv.ParseInt(ss[0], 10, 64); err != nil {
+			return fmt.Errorf("malformed duration %q: %v", s, err)
+		}
+		// Maximum seconds value per the durationpb spec.
+		const maxProtoSeconds = 315_576_000_000
+		if sec > maxProtoSeconds {
+			return fmt.Errorf("out of range: %q", s)
+		}
+		hasDigits = true
+	}
+	if len(ss) == 2 && len(ss[1]) > 0 {
+		if len(ss[1]) > 9 {
+			return fmt.Errorf("malformed duration %q: too many digits after decimal", s)
+		}
+		var err error
+		if ns, err = strconv.ParseInt(ss[1], 10, 64); err != nil {
+			return fmt.Errorf("malformed duration %q: %v", s, err)
+		}
+		for i := 9; i > len(ss[1]); i-- {
+			ns *= 10
+		}
+		hasDigits = true
+	}
+	if !hasDigits {
+		return fmt.Errorf("malformed duration %q: contains no numbers", s)
+	}
+
+	if neg {
+		sec *= -1
+		ns *= -1
+	}
+
+	// Maximum/minimum seconds/nanoseconds representable by Go's time.Duration.
+	const maxSeconds = math.MaxInt64 / int64(time.Second)
+	const maxNanosAtMaxSeconds = math.MaxInt64 % int64(time.Second)
+	const minSeconds = math.MinInt64 / int64(time.Second)
+	const minNanosAtMinSeconds = math.MinInt64 % int64(time.Second)
+
+	if sec > maxSeconds || (sec == maxSeconds && ns >= maxNanosAtMaxSeconds) {
+		*d = Duration(math.MaxInt64)
+	} else if sec < minSeconds || (sec == minSeconds && ns <= minNanosAtMinSeconds) {
+		*d = Duration(math.MinInt64)
+	} else {
+		*d = Duration(sec*int64(time.Second) + ns)
+	}
+	return nil
+}

vendor/google.golang.org/grpc/internal/transport/controlbuf.go

@@ -22,6 +22,7 @@ import (
 	"bytes"
 	"errors"
 	"fmt"
+	"net"
 	"runtime"
 	"strconv"
 	"sync"
@@ -29,6 +30,7 @@ import (
 
 	"golang.org/x/net/http2"
 	"golang.org/x/net/http2/hpack"
+	"google.golang.org/grpc/internal/grpclog"
 	"google.golang.org/grpc/internal/grpcutil"
 	"google.golang.org/grpc/status"
 )
@@ -486,12 +488,14 @@ type loopyWriter struct {
 	hEnc          *hpack.Encoder // HPACK encoder.
 	bdpEst        *bdpEstimator
 	draining      bool
+	conn          net.Conn
+	logger        *grpclog.PrefixLogger
 
 	// Side-specific handlers
 	ssGoAwayHandler func(*goAway) (bool, error)
 }
 
-func newLoopyWriter(s side, fr *framer, cbuf *controlBuffer, bdpEst *bdpEstimator) *loopyWriter {
+func newLoopyWriter(s side, fr *framer, cbuf *controlBuffer, bdpEst *bdpEstimator, conn net.Conn, logger *grpclog.PrefixLogger) *loopyWriter {
 	var buf bytes.Buffer
 	l := &loopyWriter{
 		side:          s,
@@ -504,6 +508,8 @@ func newLoopyWriter(s side, fr *framer, cbuf *controlBuffer, bdpEst *bdpEstimato
 		hBuf:          &buf,
 		hEnc:          hpack.NewEncoder(&buf),
 		bdpEst:        bdpEst,
+		conn:          conn,
+		logger:        logger,
 	}
 	return l
 }
@@ -521,15 +527,27 @@ const minBatchSize = 1000
 // 2. Stream level flow control quota available.
 //
 // In each iteration of run loop, other than processing the incoming control
-// frame, loopy calls processData, which processes one node from the activeStreams linked-list.
+// frame, loopy calls processData, which processes one node from the
-// This results in writing of HTTP2 frames into an underlying write buffer.
+// activeStreams linked-list.  This results in writing of HTTP2 frames into an
-// When there's no more control frames to read from controlBuf, loopy flushes the write buffer.
+// underlying write buffer.  When there's no more control frames to read from
-// As an optimization, to increase the batch size for each flush, loopy yields the processor, once
+// controlBuf, loopy flushes the write buffer.  As an optimization, to increase
-// if the batch size is too low to give stream goroutines a chance to fill it up.
+// the batch size for each flush, loopy yields the processor, once if the batch
+// size is too low to give stream goroutines a chance to fill it up.
+//
+// Upon exiting, if the error causing the exit is not an I/O error, run()
+// flushes and closes the underlying connection.  Otherwise, the connection is
+// left open to allow the I/O error to be encountered by the reader instead.
 func (l *loopyWriter) run() (err error) {
-	// Always flush the writer before exiting in case there are pending frames
+	defer func() {
-	// to be sent.
+		if l.logger.V(logLevel) {
-	defer l.framer.writer.Flush()
+			l.logger.Infof("loopyWriter exiting with error: %v", err)
+		}
+		if !isIOError(err) {
+			l.framer.writer.Flush()
+			l.conn.Close()
+		}
+		l.cbuf.finish()
+	}()
 	for {
 		it, err := l.cbuf.get(true)
 		if err != nil {
@@ -581,11 +599,11 @@ func (l *loopyWriter) outgoingWindowUpdateHandler(w *outgoingWindowUpdate) error
 	return l.framer.fr.WriteWindowUpdate(w.streamID, w.increment)
 }
 
-func (l *loopyWriter) incomingWindowUpdateHandler(w *incomingWindowUpdate) error {
+func (l *loopyWriter) incomingWindowUpdateHandler(w *incomingWindowUpdate) {
 	// Otherwise update the quota.
 	if w.streamID == 0 {
 		l.sendQuota += w.increment
-		return nil
+		return
 	}
 	// Find the stream and update it.
 	if str, ok := l.estdStreams[w.streamID]; ok {
@@ -593,10 +611,9 @@ func (l *loopyWriter) incomingWindowUpdateHandler(w *incomingWindowUpdate) error
 		if strQuota := int(l.oiws) - str.bytesOutStanding; strQuota > 0 && str.state == waitingOnStreamQuota {
 			str.state = active
 			l.activeStreams.enqueue(str)
-			return nil
+			return
 		}
 	}
-	return nil
 }
 
 func (l *loopyWriter) outgoingSettingsHandler(s *outgoingSettings) error {
@@ -604,13 +621,11 @@ func (l *loopyWriter) outgoingSettingsHandler(s *outgoingSettings) error {
 }
 
 func (l *loopyWriter) incomingSettingsHandler(s *incomingSettings) error {
-	if err := l.applySettings(s.ss); err != nil {
+	l.applySettings(s.ss)
-		return err
-	}
 	return l.framer.fr.WriteSettingsAck()
 }
 
-func (l *loopyWriter) registerStreamHandler(h *registerStream) error {
+func (l *loopyWriter) registerStreamHandler(h *registerStream) {
 	str := &outStream{
 		id:    h.streamID,
 		state: empty,
@@ -618,15 +633,14 @@ func (l *loopyWriter) registerStreamHandler(h *registerStream) error {
 		wq:    h.wq,
 	}
 	l.estdStreams[h.streamID] = str
-	return nil
 }
 
 func (l *loopyWriter) headerHandler(h *headerFrame) error {
 	if l.side == serverSide {
 		str, ok := l.estdStreams[h.streamID]
 		if !ok {
-			if logger.V(logLevel) {
+			if l.logger.V(logLevel) {
-				logger.Warningf("transport: loopy doesn't recognize the stream: %d", h.streamID)
+				l.logger.Infof("Unrecognized streamID %d in loopyWriter", h.streamID)
 			}
 			return nil
 		}
@@ -681,8 +695,8 @@ func (l *loopyWriter) writeHeader(streamID uint32, endStream bool, hf []hpack.He
 	l.hBuf.Reset()
 	for _, f := range hf {
 		if err := l.hEnc.WriteField(f); err != nil {
-			if logger.V(logLevel) {
+			if l.logger.V(logLevel) {
-				logger.Warningf("transport: loopyWriter.writeHeader encountered error while encoding headers: %v", err)
+				l.logger.Warningf("Encountered error while encoding headers: %v", err)
 			}
 		}
 	}
@@ -720,10 +734,10 @@ func (l *loopyWriter) writeHeader(streamID uint32, endStream bool, hf []hpack.He
 	return nil
 }
 
-func (l *loopyWriter) preprocessData(df *dataFrame) error {
+func (l *loopyWriter) preprocessData(df *dataFrame) {
 	str, ok := l.estdStreams[df.streamID]
 	if !ok {
-		return nil
+		return
 	}
 	// If we got data for a stream it means that
 	// stream was originated and the headers were sent out.
@@ -732,7 +746,6 @@ func (l *loopyWriter) preprocessData(df *dataFrame) error {
 		str.state = active
 		l.activeStreams.enqueue(str)
 	}
-	return nil
 }
 
 func (l *loopyWriter) pingHandler(p *ping) error {
@@ -743,9 +756,8 @@ func (l *loopyWriter) pingHandler(p *ping) error {
 
 }
 
-func (l *loopyWriter) outFlowControlSizeRequestHandler(o *outFlowControlSizeRequest) error {
+func (l *loopyWriter) outFlowControlSizeRequestHandler(o *outFlowControlSizeRequest) {
 	o.resp <- l.sendQuota
-	return nil
 }
 
 func (l *loopyWriter) cleanupStreamHandler(c *cleanupStream) error {
@@ -763,6 +775,7 @@ func (l *loopyWriter) cleanupStreamHandler(c *cleanupStream) error {
 		}
 	}
 	if l.draining && len(l.estdStreams) == 0 {
+		// Flush and close the connection; we are done with it.
 		return errors.New("finished processing active streams while in draining mode")
 	}
 	return nil
@@ -798,6 +811,7 @@ func (l *loopyWriter) incomingGoAwayHandler(*incomingGoAway) error {
 	if l.side == clientSide {
 		l.draining = true
 		if len(l.estdStreams) == 0 {
+			// Flush and close the connection; we are done with it.
 			return errors.New("received GOAWAY with no active streams")
 		}
 	}
@@ -816,17 +830,10 @@ func (l *loopyWriter) goAwayHandler(g *goAway) error {
 	return nil
 }
 
-func (l *loopyWriter) closeConnectionHandler() error {
-	// Exit loopyWriter entirely by returning an error here.  This will lead to
-	// the transport closing the connection, and, ultimately, transport
-	// closure.
-	return ErrConnClosing
-}
-
 func (l *loopyWriter) handle(i interface{}) error {
 	switch i := i.(type) {
 	case *incomingWindowUpdate:
-		return l.incomingWindowUpdateHandler(i)
+		l.incomingWindowUpdateHandler(i)
 	case *outgoingWindowUpdate:
 		return l.outgoingWindowUpdateHandler(i)
 	case *incomingSettings:
@@ -836,7 +843,7 @@ func (l *loopyWriter) handle(i interface{}) error {
 	case *headerFrame:
 		return l.headerHandler(i)
 	case *registerStream:
-		return l.registerStreamHandler(i)
+		l.registerStreamHandler(i)
 	case *cleanupStream:
 		return l.cleanupStreamHandler(i)
 	case *earlyAbortStream:
@@ -844,21 +851,24 @@ func (l *loopyWriter) handle(i interface{}) error {
 	case *incomingGoAway:
 		return l.incomingGoAwayHandler(i)
 	case *dataFrame:
-		return l.preprocessData(i)
+		l.preprocessData(i)
 	case *ping:
 		return l.pingHandler(i)
 	case *goAway:
 		return l.goAwayHandler(i)
 	case *outFlowControlSizeRequest:
-		return l.outFlowControlSizeRequestHandler(i)
+		l.outFlowControlSizeRequestHandler(i)
 	case closeConnection:
-		return l.closeConnectionHandler()
+		// Just return a non-I/O error and run() will flush and close the
+		// connection.
+		return ErrConnClosing
 	default:
 		return fmt.Errorf("transport: unknown control message type %T", i)
 	}
+	return nil
 }
 
-func (l *loopyWriter) applySettings(ss []http2.Setting) error {
+func (l *loopyWriter) applySettings(ss []http2.Setting) {
 	for _, s := range ss {
 		switch s.ID {
 		case http2.SettingInitialWindowSize:
@@ -877,7 +887,6 @@ func (l *loopyWriter) applySettings(ss []http2.Setting) error {
 			updateHeaderTblSize(l.hEnc, s.Val)
 		}
 	}
-	return nil
 }
 
 // processData removes the first stream from active streams, writes out at most 16KB
@@ -911,7 +920,7 @@ func (l *loopyWriter) processData() (bool, error) {
 				return false, err
 			}
 			if err := l.cleanupStreamHandler(trailer.cleanup); err != nil {
-				return false, nil
+				return false, err
 			}
 		} else {
 			l.activeStreams.enqueue(str)

vendor/google.golang.org/grpc/internal/transport/handler_server.go

@@ -39,6 +39,7 @@ import (
 	"golang.org/x/net/http2"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/credentials"
+	"google.golang.org/grpc/internal/grpclog"
 	"google.golang.org/grpc/internal/grpcutil"
 	"google.golang.org/grpc/metadata"
 	"google.golang.org/grpc/peer"
@@ -83,6 +84,7 @@ func NewServerHandlerTransport(w http.ResponseWriter, r *http.Request, stats []s
 		contentSubtype: contentSubtype,
 		stats:          stats,
 	}
+	st.logger = prefixLoggerForServerHandlerTransport(st)
 
 	if v := r.Header.Get("grpc-timeout"); v != "" {
 		to, err := decodeTimeout(v)
@@ -150,13 +152,14 @@ type serverHandlerTransport struct {
 	// TODO make sure this is consistent across handler_server and http2_server
 	contentSubtype string
 
-	stats []stats.Handler
+	stats  []stats.Handler
+	logger *grpclog.PrefixLogger
 }
 
 func (ht *serverHandlerTransport) Close(err error) {
 	ht.closeOnce.Do(func() {
-		if logger.V(logLevel) {
+		if ht.logger.V(logLevel) {
-			logger.Infof("Closing serverHandlerTransport: %v", err)
+			ht.logger.Infof("Closing: %v", err)
 		}
 		close(ht.closedCh)
 	})
@@ -450,7 +453,7 @@ func (ht *serverHandlerTransport) IncrMsgSent() {}
 
 func (ht *serverHandlerTransport) IncrMsgRecv() {}
 
-func (ht *serverHandlerTransport) Drain() {
+func (ht *serverHandlerTransport) Drain(debugData string) {
 	panic("Drain() is not implemented")
 }
 

vendor/google.golang.org/grpc/internal/transport/http2_client.go

@@ -38,6 +38,7 @@ import (
 	"google.golang.org/grpc/credentials"
 	"google.golang.org/grpc/internal/channelz"
 	icredentials "google.golang.org/grpc/internal/credentials"
+	"google.golang.org/grpc/internal/grpclog"
 	"google.golang.org/grpc/internal/grpcsync"
 	"google.golang.org/grpc/internal/grpcutil"
 	imetadata "google.golang.org/grpc/internal/metadata"
@@ -145,6 +146,7 @@ type http2Client struct {
 	bufferPool *bufferPool
 
 	connectionID uint64
+	logger       *grpclog.PrefixLogger
 }
 
 func dial(ctx context.Context, fn func(context.Context, string) (net.Conn, error), addr resolver.Address, useProxy bool, grpcUA string) (net.Conn, error) {
@@ -244,7 +246,7 @@ func newHTTP2Client(connectCtx, ctx context.Context, addr resolver.Address, opts
 		if err := connectCtx.Err(); err != nil {
 			// connectCtx expired before exiting the function.  Hard close the connection.
 			if logger.V(logLevel) {
-				logger.Infof("newClientTransport: aborting due to connectCtx: %v", err)
+				logger.Infof("Aborting due to connect deadline expiring: %v", err)
 			}
 			conn.Close()
 		}
@@ -346,6 +348,7 @@ func newHTTP2Client(connectCtx, ctx context.Context, addr resolver.Address, opts
 		bufferPool:            newBufferPool(),
 		onClose:               onClose,
 	}
+	t.logger = prefixLoggerForClientTransport(t)
 	// Add peer information to the http2client context.
 	t.ctx = peer.NewContext(t.ctx, t.getPeer())
 
@@ -444,15 +447,8 @@ func newHTTP2Client(connectCtx, ctx context.Context, addr resolver.Address, opts
 		return nil, err
 	}
 	go func() {
-		t.loopy = newLoopyWriter(clientSide, t.framer, t.controlBuf, t.bdpEst)
+		t.loopy = newLoopyWriter(clientSide, t.framer, t.controlBuf, t.bdpEst, t.conn, t.logger)
-		err := t.loopy.run()
+		t.loopy.run()
-		if logger.V(logLevel) {
-			logger.Infof("transport: loopyWriter exited. Closing connection. Err: %v", err)
-		}
-		// Do not close the transport.  Let reader goroutine handle it since
-		// there might be data in the buffers.
-		t.conn.Close()
-		t.controlBuf.finish()
 		close(t.writerDone)
 	}()
 	return t, nil
@@ -789,7 +785,7 @@ func (t *http2Client) NewStream(ctx context.Context, callHdr *CallHdr) (*Stream,
 		s.id = h.streamID
 		s.fc = &inFlow{limit: uint32(t.initialWindowSize)}
 		t.mu.Lock()
-		if t.activeStreams == nil { // Can be niled from Close().
+		if t.state == draining || t.activeStreams == nil { // Can be niled from Close().
 			t.mu.Unlock()
 			return false // Don't create a stream if the transport is already closed.
 		}
@@ -866,8 +862,8 @@ func (t *http2Client) NewStream(ctx context.Context, callHdr *CallHdr) (*Stream,
 		}
 	}
 	if transportDrainRequired {
-		if logger.V(logLevel) {
+		if t.logger.V(logLevel) {
-			logger.Infof("transport: t.nextID > MaxStreamID. Draining")
+			t.logger.Infof("Draining transport: t.nextID > MaxStreamID")
 		}
 		t.GracefulClose()
 	}
@@ -959,8 +955,8 @@ func (t *http2Client) Close(err error) {
 		t.mu.Unlock()
 		return
 	}
-	if logger.V(logLevel) {
+	if t.logger.V(logLevel) {
-		logger.Infof("transport: closing: %v", err)
+		t.logger.Infof("Closing: %v", err)
 	}
 	// Call t.onClose ASAP to prevent the client from attempting to create new
 	// streams.
@@ -1016,8 +1012,8 @@ func (t *http2Client) GracefulClose() {
 		t.mu.Unlock()
 		return
 	}
-	if logger.V(logLevel) {
+	if t.logger.V(logLevel) {
-		logger.Infof("transport: GracefulClose called")
+		t.logger.Infof("GracefulClose called")
 	}
 	t.onClose(GoAwayInvalid)
 	t.state = draining
@@ -1181,8 +1177,8 @@ func (t *http2Client) handleRSTStream(f *http2.RSTStreamFrame) {
 	}
 	statusCode, ok := http2ErrConvTab[f.ErrCode]
 	if !ok {
-		if logger.V(logLevel) {
+		if t.logger.V(logLevel) {
-			logger.Warningf("transport: http2Client.handleRSTStream found no mapped gRPC status for the received http2 error: %v", f.ErrCode)
+			t.logger.Infof("Received a RST_STREAM frame with code %q, but found no mapped gRPC status", f.ErrCode)
 		}
 		statusCode = codes.Unknown
 	}
@@ -1264,10 +1260,12 @@ func (t *http2Client) handleGoAway(f *http2.GoAwayFrame) {
 		t.mu.Unlock()
 		return
 	}
-	if f.ErrCode == http2.ErrCodeEnhanceYourCalm {
+	if f.ErrCode == http2.ErrCodeEnhanceYourCalm && string(f.DebugData()) == "too_many_pings" {
-		if logger.V(logLevel) {
+		// When a client receives a GOAWAY with error code ENHANCE_YOUR_CALM and debug
-			logger.Infof("Client received GoAway with http2.ErrCodeEnhanceYourCalm.")
+		// data equal to ASCII "too_many_pings", it should log the occurrence at a log level that is
-		}
+		// enabled by default and double the configure KEEPALIVE_TIME used for new connections
+		// on that channel.
+		logger.Errorf("Client received GoAway with error code ENHANCE_YOUR_CALM and debug data equal to ASCII \"too_many_pings\".")
 	}
 	id := f.LastStreamID
 	if id > 0 && id%2 == 0 {
@@ -1339,7 +1337,7 @@ func (t *http2Client) handleGoAway(f *http2.GoAwayFrame) {
 
 // setGoAwayReason sets the value of t.goAwayReason based
 // on the GoAway frame received.
-// It expects a lock on transport's mutext to be held by
+// It expects a lock on transport's mutex to be held by
 // the caller.
 func (t *http2Client) setGoAwayReason(f *http2.GoAwayFrame) {
 	t.goAwayReason = GoAwayNoReason

vendor/google.golang.org/grpc/internal/transport/http2_server.go

@@ -35,7 +35,9 @@ import (
 	"github.com/golang/protobuf/proto"
 	"golang.org/x/net/http2"
 	"golang.org/x/net/http2/hpack"
+	"google.golang.org/grpc/internal/grpclog"
 	"google.golang.org/grpc/internal/grpcutil"
+	"google.golang.org/grpc/internal/pretty"
 	"google.golang.org/grpc/internal/syscall"
 
 	"google.golang.org/grpc/codes"
@@ -129,6 +131,8 @@ type http2Server struct {
 	// This lock may not be taken if mu is already held.
 	maxStreamMu sync.Mutex
 	maxStreamID uint32 // max stream ID ever seen
+
+	logger *grpclog.PrefixLogger
 }
 
 // NewServerTransport creates a http2 transport with conn and configuration
@@ -167,15 +171,10 @@ func NewServerTransport(conn net.Conn, config *ServerConfig) (_ ServerTransport,
 		ID:  http2.SettingMaxFrameSize,
 		Val: http2MaxFrameLen,
 	}}
-	// TODO(zhaoq): Have a better way to signal "no limit" because 0 is
+	if config.MaxStreams != math.MaxUint32 {
-	// permitted in the HTTP2 spec.
-	maxStreams := config.MaxStreams
-	if maxStreams == 0 {
-		maxStreams = math.MaxUint32
-	} else {
 		isettings = append(isettings, http2.Setting{
 			ID:  http2.SettingMaxConcurrentStreams,
-			Val: maxStreams,
+			Val: config.MaxStreams,
 		})
 	}
 	dynamicWindow := true
@@ -254,7 +253,7 @@ func NewServerTransport(conn net.Conn, config *ServerConfig) (_ ServerTransport,
 		framer:            framer,
 		readerDone:        make(chan struct{}),
 		writerDone:        make(chan struct{}),
-		maxStreams:        maxStreams,
+		maxStreams:        config.MaxStreams,
 		inTapHandle:       config.InTapHandle,
 		fc:                &trInFlow{limit: uint32(icwz)},
 		state:             reachable,
@@ -267,6 +266,7 @@ func NewServerTransport(conn net.Conn, config *ServerConfig) (_ ServerTransport,
 		czData:            new(channelzData),
 		bufferPool:        newBufferPool(),
 	}
+	t.logger = prefixLoggerForServerTransport(t)
 	// Add peer information to the http2server context.
 	t.ctx = peer.NewContext(t.ctx, t.getPeer())
 
@@ -331,14 +331,9 @@ func NewServerTransport(conn net.Conn, config *ServerConfig) (_ ServerTransport,
 	t.handleSettings(sf)
 
 	go func() {
-		t.loopy = newLoopyWriter(serverSide, t.framer, t.controlBuf, t.bdpEst)
+		t.loopy = newLoopyWriter(serverSide, t.framer, t.controlBuf, t.bdpEst, t.conn, t.logger)
 		t.loopy.ssGoAwayHandler = t.outgoingGoAwayHandler
-		err := t.loopy.run()
+		t.loopy.run()
-		if logger.V(logLevel) {
-			logger.Infof("transport: loopyWriter exited. Closing connection. Err: %v", err)
-		}
-		t.conn.Close()
-		t.controlBuf.finish()
 		close(t.writerDone)
 	}()
 	go t.keepalive()
@@ -383,7 +378,7 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 		// if false, content-type was missing or invalid
 		isGRPC      = false
 		contentType = ""
-		mdata       = make(map[string][]string)
+		mdata       = make(metadata.MD, len(frame.Fields))
 		httpMethod  string
 		// these are set if an error is encountered while parsing the headers
 		protocolError bool
@@ -404,6 +399,17 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 			mdata[hf.Name] = append(mdata[hf.Name], hf.Value)
 			s.contentSubtype = contentSubtype
 			isGRPC = true
+
+		case "grpc-accept-encoding":
+			mdata[hf.Name] = append(mdata[hf.Name], hf.Value)
+			if hf.Value == "" {
+				continue
+			}
+			compressors := hf.Value
+			if s.clientAdvertisedCompressors != "" {
+				compressors = s.clientAdvertisedCompressors + "," + compressors
+			}
+			s.clientAdvertisedCompressors = compressors
 		case "grpc-encoding":
 			s.recvCompress = hf.Value
 		case ":method":
@@ -419,8 +425,8 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 		// "Transports must consider requests containing the Connection header
 		// as malformed." - A41
 		case "connection":
-			if logger.V(logLevel) {
+			if t.logger.V(logLevel) {
-				logger.Errorf("transport: http2Server.operateHeaders parsed a :connection header which makes a request malformed as per the HTTP/2 spec")
+				t.logger.Infof("Received a HEADERS frame with a :connection header which makes the request malformed, as per the HTTP/2 spec")
 			}
 			protocolError = true
 		default:
@@ -430,7 +436,7 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 			v, err := decodeMetadataHeader(hf.Name, hf.Value)
 			if err != nil {
 				headerError = status.Newf(codes.Internal, "malformed binary metadata %q in header %q: %v", hf.Value, hf.Name, err)
-				logger.Warningf("Failed to decode metadata header (%q, %q): %v", hf.Name, hf.Value, err)
+				t.logger.Warningf("Failed to decode metadata header (%q, %q): %v", hf.Name, hf.Value, err)
 				break
 			}
 			mdata[hf.Name] = append(mdata[hf.Name], v)
@@ -444,8 +450,8 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 	// error, this takes precedence over a client not speaking gRPC.
 	if len(mdata[":authority"]) > 1 || len(mdata["host"]) > 1 {
 		errMsg := fmt.Sprintf("num values of :authority: %v, num values of host: %v, both must only have 1 value as per HTTP/2 spec", len(mdata[":authority"]), len(mdata["host"]))
-		if logger.V(logLevel) {
+		if t.logger.V(logLevel) {
-			logger.Errorf("transport: %v", errMsg)
+			t.logger.Infof("Aborting the stream early: %v", errMsg)
 		}
 		t.controlBuf.put(&earlyAbortStream{
 			httpStatus:     http.StatusBadRequest,
@@ -539,9 +545,9 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 	}
 	if httpMethod != http.MethodPost {
 		t.mu.Unlock()
-		errMsg := fmt.Sprintf("http2Server.operateHeaders parsed a :method field: %v which should be POST", httpMethod)
+		errMsg := fmt.Sprintf("Received a HEADERS frame with :method %q which should be POST", httpMethod)
-		if logger.V(logLevel) {
+		if t.logger.V(logLevel) {
-			logger.Infof("transport: %v", errMsg)
+			t.logger.Infof("Aborting the stream early: %v", errMsg)
 		}
 		t.controlBuf.put(&earlyAbortStream{
 			httpStatus:     405,
@@ -557,8 +563,8 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 		var err error
 		if s.ctx, err = t.inTapHandle(s.ctx, &tap.Info{FullMethodName: s.method}); err != nil {
 			t.mu.Unlock()
-			if logger.V(logLevel) {
+			if t.logger.V(logLevel) {
-				logger.Infof("transport: http2Server.operateHeaders got an error from InTapHandle: %v", err)
+				t.logger.Infof("Aborting the stream early due to InTapHandle failure: %v", err)
 			}
 			stat, ok := status.FromError(err)
 			if !ok {
@@ -595,7 +601,7 @@ func (t *http2Server) operateHeaders(frame *http2.MetaHeadersFrame, handle func(
 			LocalAddr:   t.localAddr,
 			Compression: s.recvCompress,
 			WireLength:  int(frame.Header().Length),
-			Header:      metadata.MD(mdata).Copy(),
+			Header:      mdata.Copy(),
 		}
 		sh.HandleRPC(s.ctx, inHeader)
 	}
@@ -632,8 +638,8 @@ func (t *http2Server) HandleStreams(handle func(*Stream), traceCtx func(context.
 		atomic.StoreInt64(&t.lastRead, time.Now().UnixNano())
 		if err != nil {
 			if se, ok := err.(http2.StreamError); ok {
-				if logger.V(logLevel) {
+				if t.logger.V(logLevel) {
-					logger.Warningf("transport: http2Server.HandleStreams encountered http2.StreamError: %v", se)
+					t.logger.Warningf("Encountered http2.StreamError: %v", se)
 				}
 				t.mu.Lock()
 				s := t.activeStreams[se.StreamID]
@@ -676,8 +682,8 @@ func (t *http2Server) HandleStreams(handle func(*Stream), traceCtx func(context.
 		case *http2.GoAwayFrame:
 			// TODO: Handle GoAway from the client appropriately.
 		default:
-			if logger.V(logLevel) {
+			if t.logger.V(logLevel) {
-				logger.Errorf("transport: http2Server.HandleStreams found unhandled frame type %v.", frame)
+				t.logger.Infof("Received unsupported frame type %T", frame)
 			}
 		}
 	}
@@ -936,8 +942,8 @@ func (t *http2Server) checkForHeaderListSize(it interface{}) bool {
 	var sz int64
 	for _, f := range hdrFrame.hf {
 		if sz += int64(f.Size()); sz > int64(*t.maxSendHeaderListSize) {
-			if logger.V(logLevel) {
+			if t.logger.V(logLevel) {
-				logger.Errorf("header list size to send violates the maximum size (%d bytes) set by client", *t.maxSendHeaderListSize)
+				t.logger.Infof("Header list size to send violates the maximum size (%d bytes) set by client", *t.maxSendHeaderListSize)
 			}
 			return false
 		}
@@ -1050,7 +1056,7 @@ func (t *http2Server) WriteStatus(s *Stream, st *status.Status) error {
 		stBytes, err := proto.Marshal(p)
 		if err != nil {
 			// TODO: return error instead, when callers are able to handle it.
-			logger.Errorf("transport: failed to marshal rpc status: %v, error: %v", p, err)
+			t.logger.Errorf("Failed to marshal rpc status: %s, error: %v", pretty.ToJSON(p), err)
 		} else {
 			headerFields = append(headerFields, hpack.HeaderField{Name: "grpc-status-details-bin", Value: encodeBinHeader(stBytes)})
 		}
@@ -1155,18 +1161,18 @@ func (t *http2Server) keepalive() {
 			if val <= 0 {
 				// The connection has been idle for a duration of keepalive.MaxConnectionIdle or more.
 				// Gracefully close the connection.
-				t.Drain()
+				t.Drain("max_idle")
 				return
 			}
 			idleTimer.Reset(val)
 		case <-ageTimer.C:
-			t.Drain()
+			t.Drain("max_age")
 			ageTimer.Reset(t.kp.MaxConnectionAgeGrace)
 			select {
 			case <-ageTimer.C:
 				// Close the connection after grace period.
-				if logger.V(logLevel) {
+				if t.logger.V(logLevel) {
-					logger.Infof("transport: closing server transport due to maximum connection age.")
+					t.logger.Infof("Closing server transport due to maximum connection age")
 				}
 				t.controlBuf.put(closeConnection{})
 			case <-t.done:
@@ -1217,8 +1223,8 @@ func (t *http2Server) Close(err error) {
 		t.mu.Unlock()
 		return
 	}
-	if logger.V(logLevel) {
+	if t.logger.V(logLevel) {
-		logger.Infof("transport: closing: %v", err)
+		t.logger.Infof("Closing: %v", err)
 	}
 	t.state = closing
 	streams := t.activeStreams
@@ -1226,8 +1232,8 @@ func (t *http2Server) Close(err error) {
 	t.mu.Unlock()
 	t.controlBuf.finish()
 	close(t.done)
-	if err := t.conn.Close(); err != nil && logger.V(logLevel) {
+	if err := t.conn.Close(); err != nil && t.logger.V(logLevel) {
-		logger.Infof("transport: error closing conn during Close: %v", err)
+		t.logger.Infof("Error closing underlying net.Conn during Close: %v", err)
 	}
 	channelz.RemoveEntry(t.channelzID)
 	// Cancel all active streams.
@@ -1307,14 +1313,14 @@ func (t *http2Server) RemoteAddr() net.Addr {
 	return t.remoteAddr
 }
 
-func (t *http2Server) Drain() {
+func (t *http2Server) Drain(debugData string) {
 	t.mu.Lock()
 	defer t.mu.Unlock()
 	if t.drainEvent != nil {
 		return
 	}
 	t.drainEvent = grpcsync.NewEvent()
-	t.controlBuf.put(&goAway{code: http2.ErrCodeNo, debugData: []byte{}, headsUp: true})
+	t.controlBuf.put(&goAway{code: http2.ErrCodeNo, debugData: []byte(debugData), headsUp: true})
 }
 
 var goAwayPing = &ping{data: [8]byte{1, 6, 1, 8, 0, 3, 3, 9}}
@@ -1344,9 +1350,6 @@ func (t *http2Server) outgoingGoAwayHandler(g *goAway) (bool, error) {
 			return false, err
 		}
 		if retErr != nil {
-			// Abruptly close the connection following the GoAway (via
-			// loopywriter).  But flush out what's inside the buffer first.
-			t.framer.writer.Flush()
 			return false, retErr
 		}
 		return true, nil
@@ -1359,7 +1362,7 @@ func (t *http2Server) outgoingGoAwayHandler(g *goAway) (bool, error) {
 	// originated before the GoAway reaches the client.
 	// After getting the ack or timer expiration send out another GoAway this
 	// time with an ID of the max stream server intends to process.
-	if err := t.framer.fr.WriteGoAway(math.MaxUint32, http2.ErrCodeNo, []byte{}); err != nil {
+	if err := t.framer.fr.WriteGoAway(math.MaxUint32, http2.ErrCodeNo, g.debugData); err != nil {
 		return false, err
 	}
 	if err := t.framer.fr.WritePing(false, goAwayPing.data); err != nil {

vendor/google.golang.org/grpc/internal/transport/http_util.go

@@ -21,6 +21,7 @@ package transport
 import (
 	"bufio"
 	"encoding/base64"
+	"errors"
 	"fmt"
 	"io"
 	"math"
@@ -37,7 +38,6 @@ import (
 	"golang.org/x/net/http2/hpack"
 	spb "google.golang.org/genproto/googleapis/rpc/status"
 	"google.golang.org/grpc/codes"
-	"google.golang.org/grpc/grpclog"
 	"google.golang.org/grpc/status"
 )
 
@@ -85,7 +85,6 @@ var (
 		// 504 Gateway timeout - UNAVAILABLE.
 		http.StatusGatewayTimeout: codes.Unavailable,
 	}
-	logger = grpclog.Component("transport")
 )
 
 // isReservedHeader checks whether hdr belongs to HTTP2 headers
@@ -330,7 +329,8 @@ func (w *bufWriter) Write(b []byte) (n int, err error) {
 		return 0, w.err
 	}
 	if w.batchSize == 0 { // Buffer has been disabled.
-		return w.conn.Write(b)
+		n, err = w.conn.Write(b)
+		return n, toIOError(err)
 	}
 	for len(b) > 0 {
 		nn := copy(w.buf[w.offset:], b)
@@ -352,10 +352,30 @@ func (w *bufWriter) Flush() error {
 		return nil
 	}
 	_, w.err = w.conn.Write(w.buf[:w.offset])
+	w.err = toIOError(w.err)
 	w.offset = 0
 	return w.err
 }
 
+type ioError struct {
+	error
+}
+
+func (i ioError) Unwrap() error {
+	return i.error
+}
+
+func isIOError(err error) bool {
+	return errors.As(err, &ioError{})
+}
+
+func toIOError(err error) error {
+	if err == nil {
+		return nil
+	}
+	return ioError{error: err}
+}
+
 type framer struct {
 	writer *bufWriter
 	fr     *http2.Framer

vendor/google.golang.org/grpc/internal/transport/logging.go

@@ -0,0 +1,40 @@
+/*
+ *
+ * Copyright 2023 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+package transport
+
+import (
+	"fmt"
+
+	"google.golang.org/grpc/grpclog"
+	internalgrpclog "google.golang.org/grpc/internal/grpclog"
+)
+
+var logger = grpclog.Component("transport")
+
+func prefixLoggerForServerTransport(p *http2Server) *internalgrpclog.PrefixLogger {
+	return internalgrpclog.NewPrefixLogger(logger, fmt.Sprintf("[server-transport %p] ", p))
+}
+
+func prefixLoggerForServerHandlerTransport(p *serverHandlerTransport) *internalgrpclog.PrefixLogger {
+	return internalgrpclog.NewPrefixLogger(logger, fmt.Sprintf("[server-handler-transport %p] ", p))
+}
+
+func prefixLoggerForClientTransport(p *http2Client) *internalgrpclog.PrefixLogger {
+	return internalgrpclog.NewPrefixLogger(logger, fmt.Sprintf("[client-transport %p] ", p))
+}

vendor/google.golang.org/grpc/internal/transport/transport.go

@@ -257,6 +257,9 @@ type Stream struct {
 	fc           *inFlow
 	wq           *writeQuota
 
+	// Holds compressor names passed in grpc-accept-encoding metadata from the
+	// client. This is empty for the client side stream.
+	clientAdvertisedCompressors string
 	// Callback to state application's intentions to read data. This
 	// is used to adjust flow control, if needed.
 	requestRead func(int)
@@ -345,8 +348,24 @@ func (s *Stream) RecvCompress() string {
 }
 
 // SetSendCompress sets the compression algorithm to the stream.
-func (s *Stream) SetSendCompress(str string) {
+func (s *Stream) SetSendCompress(name string) error {
-	s.sendCompress = str
+	if s.isHeaderSent() || s.getState() == streamDone {
+		return errors.New("transport: set send compressor called after headers sent or stream done")
+	}
+
+	s.sendCompress = name
+	return nil
+}
+
+// SendCompress returns the send compressor name.
+func (s *Stream) SendCompress() string {
+	return s.sendCompress
+}
+
+// ClientAdvertisedCompressors returns the compressor names advertised by the
+// client via grpc-accept-encoding header.
+func (s *Stream) ClientAdvertisedCompressors() string {
+	return s.clientAdvertisedCompressors
 }
 
 // Done returns a channel which is closed when it receives the final status
@@ -707,7 +726,7 @@ type ServerTransport interface {
 	RemoteAddr() net.Addr
 
 	// Drain notifies the client this ServerTransport stops accepting new RPCs.
-	Drain()
+	Drain(debugData string)
 
 	// IncrMsgSent increments the number of message sent through this transport.
 	IncrMsgSent()

vendor/google.golang.org/grpc/metadata/metadata.go

@@ -91,7 +91,11 @@ func (md MD) Len() int {
 
 // Copy returns a copy of md.
 func (md MD) Copy() MD {
-	return Join(md)
+	out := make(MD, len(md))
+	for k, v := range md {
+		out[k] = copyOf(v)
+	}
+	return out
 }
 
 // Get obtains the values for a given key.
@@ -171,8 +175,11 @@ func AppendToOutgoingContext(ctx context.Context, kv ...string) context.Context
 	md, _ := ctx.Value(mdOutgoingKey{}).(rawMD)
 	added := make([][]string, len(md.added)+1)
 	copy(added, md.added)
-	added[len(added)-1] = make([]string, len(kv))
+	kvCopy := make([]string, 0, len(kv))
-	copy(added[len(added)-1], kv)
+	for i := 0; i < len(kv); i += 2 {
+		kvCopy = append(kvCopy, strings.ToLower(kv[i]), kv[i+1])
+	}
+	added[len(added)-1] = kvCopy
 	return context.WithValue(ctx, mdOutgoingKey{}, rawMD{md: md.md, added: added})
 }
 

vendor/google.golang.org/grpc/picker_wrapper.go

@@ -36,6 +36,7 @@ import (
 type pickerWrapper struct {
 	mu         sync.Mutex
 	done       bool
+	idle       bool
 	blockingCh chan struct{}
 	picker     balancer.Picker
 }
@@ -47,7 +48,11 @@ func newPickerWrapper() *pickerWrapper {
 // updatePicker is called by UpdateBalancerState. It unblocks all blocked pick.
 func (pw *pickerWrapper) updatePicker(p balancer.Picker) {
 	pw.mu.Lock()
-	if pw.done {
+	if pw.done || pw.idle {
+		// There is a small window where a picker update from the LB policy can
+		// race with the channel going to idle mode. If the picker is idle here,
+		// it is because the channel asked it to do so, and therefore it is sage
+		// to ignore the update from the LB policy.
 		pw.mu.Unlock()
 		return
 	}
@@ -63,10 +68,8 @@ func (pw *pickerWrapper) updatePicker(p balancer.Picker) {
 //   - wraps the done function in the passed in result to increment the calls
 //     failed or calls succeeded channelz counter before invoking the actual
 //     done function.
-func doneChannelzWrapper(acw *acBalancerWrapper, result *balancer.PickResult) {
+func doneChannelzWrapper(acbw *acBalancerWrapper, result *balancer.PickResult) {
-	acw.mu.Lock()
+	ac := acbw.ac
-	ac := acw.ac
-	acw.mu.Unlock()
 	ac.incrCallsStarted()
 	done := result.Done
 	result.Done = func(b balancer.DoneInfo) {
@@ -152,14 +155,14 @@ func (pw *pickerWrapper) pick(ctx context.Context, failfast bool, info balancer.
 			return nil, balancer.PickResult{}, status.Error(codes.Unavailable, err.Error())
 		}
 
-		acw, ok := pickResult.SubConn.(*acBalancerWrapper)
+		acbw, ok := pickResult.SubConn.(*acBalancerWrapper)
 		if !ok {
 			logger.Errorf("subconn returned from pick is type %T, not *acBalancerWrapper", pickResult.SubConn)
 			continue
 		}
-		if t := acw.getAddrConn().getReadyTransport(); t != nil {
+		if t := acbw.ac.getReadyTransport(); t != nil {
 			if channelz.IsOn() {
-				doneChannelzWrapper(acw, &pickResult)
+				doneChannelzWrapper(acbw, &pickResult)
 				return t, pickResult, nil
 			}
 			return t, pickResult, nil
@@ -187,6 +190,25 @@ func (pw *pickerWrapper) close() {
 	close(pw.blockingCh)
 }
 
+func (pw *pickerWrapper) enterIdleMode() {
+	pw.mu.Lock()
+	defer pw.mu.Unlock()
+	if pw.done {
+		return
+	}
+	pw.idle = true
+}
+
+func (pw *pickerWrapper) exitIdleMode() {
+	pw.mu.Lock()
+	defer pw.mu.Unlock()
+	if pw.done {
+		return
+	}
+	pw.blockingCh = make(chan struct{})
+	pw.idle = false
+}
+
 // dropError is a wrapper error that indicates the LB policy wishes to drop the
 // RPC and not retry it.
 type dropError struct {

vendor/google.golang.org/grpc/pickfirst.go

@@ -19,11 +19,15 @@
 package grpc
 
 import (
+	"encoding/json"
 	"errors"
 	"fmt"
 
 	"google.golang.org/grpc/balancer"
 	"google.golang.org/grpc/connectivity"
+	"google.golang.org/grpc/internal/envconfig"
+	"google.golang.org/grpc/internal/grpcrand"
+	"google.golang.org/grpc/serviceconfig"
 )
 
 // PickFirstBalancerName is the name of the pick_first balancer.
@@ -43,10 +47,28 @@ func (*pickfirstBuilder) Name() string {
 	return PickFirstBalancerName
 }
 
+type pfConfig struct {
+	serviceconfig.LoadBalancingConfig `json:"-"`
+
+	// If set to true, instructs the LB policy to shuffle the order of the list
+	// of addresses received from the name resolver before attempting to
+	// connect to them.
+	ShuffleAddressList bool `json:"shuffleAddressList"`
+}
+
+func (*pickfirstBuilder) ParseConfig(js json.RawMessage) (serviceconfig.LoadBalancingConfig, error) {
+	cfg := &pfConfig{}
+	if err := json.Unmarshal(js, cfg); err != nil {
+		return nil, fmt.Errorf("pickfirst: unable to unmarshal LB policy config: %s, error: %v", string(js), err)
+	}
+	return cfg, nil
+}
+
 type pickfirstBalancer struct {
 	state   connectivity.State
 	cc      balancer.ClientConn
 	subConn balancer.SubConn
+	cfg     *pfConfig
 }
 
 func (b *pickfirstBalancer) ResolverError(err error) {
@@ -69,7 +91,8 @@ func (b *pickfirstBalancer) ResolverError(err error) {
 }
 
 func (b *pickfirstBalancer) UpdateClientConnState(state balancer.ClientConnState) error {
-	if len(state.ResolverState.Addresses) == 0 {
+	addrs := state.ResolverState.Addresses
+	if len(addrs) == 0 {
 		// The resolver reported an empty address list. Treat it like an error by
 		// calling b.ResolverError.
 		if b.subConn != nil {
@@ -82,12 +105,23 @@ func (b *pickfirstBalancer) UpdateClientConnState(state balancer.ClientConnState
 		return balancer.ErrBadResolverState
 	}
 
+	if state.BalancerConfig != nil {
+		cfg, ok := state.BalancerConfig.(*pfConfig)
+		if !ok {
+			return fmt.Errorf("pickfirstBalancer: received nil or illegal BalancerConfig (type %T): %v", state.BalancerConfig, state.BalancerConfig)
+		}
+		b.cfg = cfg
+	}
+
+	if envconfig.PickFirstLBConfig && b.cfg != nil && b.cfg.ShuffleAddressList {
+		grpcrand.Shuffle(len(addrs), func(i, j int) { addrs[i], addrs[j] = addrs[j], addrs[i] })
+	}
 	if b.subConn != nil {
-		b.cc.UpdateAddresses(b.subConn, state.ResolverState.Addresses)
+		b.cc.UpdateAddresses(b.subConn, addrs)
 		return nil
 	}
 
-	subConn, err := b.cc.NewSubConn(state.ResolverState.Addresses, balancer.NewSubConnOptions{})
+	subConn, err := b.cc.NewSubConn(addrs, balancer.NewSubConnOptions{})
 	if err != nil {
 		if logger.V(2) {
 			logger.Errorf("pickfirstBalancer: failed to NewSubConn: %v", err)
@@ -119,7 +153,6 @@ func (b *pickfirstBalancer) UpdateSubConnState(subConn balancer.SubConn, state b
 		}
 		return
 	}
-	b.state = state.ConnectivityState
 	if state.ConnectivityState == connectivity.Shutdown {
 		b.subConn = nil
 		return
@@ -132,11 +165,21 @@ func (b *pickfirstBalancer) UpdateSubConnState(subConn balancer.SubConn, state b
 			Picker:            &picker{result: balancer.PickResult{SubConn: subConn}},
 		})
 	case connectivity.Connecting:
+		if b.state == connectivity.TransientFailure {
+			// We stay in TransientFailure until we are Ready. See A62.
+			return
+		}
 		b.cc.UpdateState(balancer.State{
 			ConnectivityState: state.ConnectivityState,
 			Picker:            &picker{err: balancer.ErrNoSubConnAvailable},
 		})
 	case connectivity.Idle:
+		if b.state == connectivity.TransientFailure {
+			// We stay in TransientFailure until we are Ready. Also kick the
+			// subConn out of Idle into Connecting. See A62.
+			b.subConn.Connect()
+			return
+		}
 		b.cc.UpdateState(balancer.State{
 			ConnectivityState: state.ConnectivityState,
 			Picker:            &idlePicker{subConn: subConn},
@@ -147,6 +190,7 @@ func (b *pickfirstBalancer) UpdateSubConnState(subConn balancer.SubConn, state b
 			Picker:            &picker{err: state.ConnectionError},
 		})
 	}
+	b.state = state.ConnectivityState
 }
 
 func (b *pickfirstBalancer) Close() {

vendor/google.golang.org/grpc/resolver/resolver.go

@@ -22,13 +22,13 @@ package resolver
 
 import (
 	"context"
+	"fmt"
 	"net"
 	"net/url"
 	"strings"
 
 	"google.golang.org/grpc/attributes"
 	"google.golang.org/grpc/credentials"
-	"google.golang.org/grpc/internal/pretty"
 	"google.golang.org/grpc/serviceconfig"
 )
 
@@ -41,8 +41,9 @@ var (
 
 // TODO(bar) install dns resolver in init(){}.
 
-// Register registers the resolver builder to the resolver map. b.Scheme will be
+// Register registers the resolver builder to the resolver map. b.Scheme will
-// used as the scheme registered with this builder.
+// be used as the scheme registered with this builder. The registry is case
+// sensitive, and schemes should not contain any uppercase characters.
 //
 // NOTE: this function must only be called during initialization time (i.e. in
 // an init() function), and is not thread-safe. If multiple Resolvers are
@@ -123,7 +124,7 @@ type Address struct {
 	Attributes *attributes.Attributes
 
 	// BalancerAttributes contains arbitrary data about this address intended
-	// for consumption by the LB policy.  These attribes do not affect SubConn
+	// for consumption by the LB policy.  These attributes do not affect SubConn
 	// creation, connection establishment, handshaking, etc.
 	BalancerAttributes *attributes.Attributes
 
@@ -150,7 +151,17 @@ func (a Address) Equal(o Address) bool {
 
 // String returns JSON formatted string representation of the address.
 func (a Address) String() string {
-	return pretty.ToJSON(a)
+	var sb strings.Builder
+	sb.WriteString(fmt.Sprintf("{Addr: %q, ", a.Addr))
+	sb.WriteString(fmt.Sprintf("ServerName: %q, ", a.ServerName))
+	if a.Attributes != nil {
+		sb.WriteString(fmt.Sprintf("Attributes: %v, ", a.Attributes.String()))
+	}
+	if a.BalancerAttributes != nil {
+		sb.WriteString(fmt.Sprintf("BalancerAttributes: %v", a.BalancerAttributes.String()))
+	}
+	sb.WriteString("}")
+	return sb.String()
 }
 
 // BuildOptions includes additional information for the builder to create
@@ -203,6 +214,15 @@ type State struct {
 // gRPC to add new methods to this interface.
 type ClientConn interface {
 	// UpdateState updates the state of the ClientConn appropriately.
+	//
+	// If an error is returned, the resolver should try to resolve the
+	// target again. The resolver should use a backoff timer to prevent
+	// overloading the server with requests. If a resolver is certain that
+	// reresolving will not change the result, e.g. because it is
+	// a watch-based resolver, returned errors can be ignored.
+	//
+	// If the resolved State is the same as the last reported one, calling
+	// UpdateState can be omitted.
 	UpdateState(State) error
 	// ReportError notifies the ClientConn that the Resolver encountered an
 	// error.  The ClientConn will notify the load balancer and begin calling
@@ -280,8 +300,10 @@ type Builder interface {
 	// gRPC dial calls Build synchronously, and fails if the returned error is
 	// not nil.
 	Build(target Target, cc ClientConn, opts BuildOptions) (Resolver, error)
-	// Scheme returns the scheme supported by this resolver.
+	// Scheme returns the scheme supported by this resolver.  Scheme is defined
-	// Scheme is defined at https://github.com/grpc/grpc/blob/master/doc/naming.md.
+	// at https://github.com/grpc/grpc/blob/master/doc/naming.md.  The returned
+	// string should not contain uppercase characters, as they will not match
+	// the parsed target's scheme as defined in RFC 3986.
 	Scheme() string
 }
 

vendor/google.golang.org/grpc/resolver_conn_wrapper.go

@@ -19,11 +19,11 @@
 package grpc
 
 import (
+	"context"
 	"strings"
 	"sync"
 
 	"google.golang.org/grpc/balancer"
-	"google.golang.org/grpc/credentials"
 	"google.golang.org/grpc/internal/channelz"
 	"google.golang.org/grpc/internal/grpcsync"
 	"google.golang.org/grpc/internal/pretty"
@@ -31,129 +31,192 @@ import (
 	"google.golang.org/grpc/serviceconfig"
 )
 
+// resolverStateUpdater wraps the single method used by ccResolverWrapper to
+// report a state update from the actual resolver implementation.
+type resolverStateUpdater interface {
+	updateResolverState(s resolver.State, err error) error
+}
+
 // ccResolverWrapper is a wrapper on top of cc for resolvers.
 // It implements resolver.ClientConn interface.
 type ccResolverWrapper struct {
-	cc         *ClientConn
+	// The following fields are initialized when the wrapper is created and are
-	resolverMu sync.Mutex
+	// read-only afterwards, and therefore can be accessed without a mutex.
-	resolver   resolver.Resolver
+	cc                  resolverStateUpdater
-	done       *grpcsync.Event
+	channelzID          *channelz.Identifier
-	curState   resolver.State
+	ignoreServiceConfig bool
+	opts                ccResolverWrapperOpts
+	serializer          *grpcsync.CallbackSerializer // To serialize all incoming calls.
+	serializerCancel    context.CancelFunc           // To close the serializer, accessed only from close().
 
-	incomingMu sync.Mutex // Synchronizes all the incoming calls.
+	// All incoming (resolver --> gRPC) calls are guaranteed to execute in a
+	// mutually exclusive manner as they are scheduled on the serializer.
+	// Fields accessed *only* in these serializer callbacks, can therefore be
+	// accessed without a mutex.
+	curState resolver.State
+
+	// mu guards access to the below fields.
+	mu       sync.Mutex
+	closed   bool
+	resolver resolver.Resolver // Accessed only from outgoing calls.
+}
+
+// ccResolverWrapperOpts wraps the arguments to be passed when creating a new
+// ccResolverWrapper.
+type ccResolverWrapperOpts struct {
+	target     resolver.Target       // User specified dial target to resolve.
+	builder    resolver.Builder      // Resolver builder to use.
+	bOpts      resolver.BuildOptions // Resolver build options to use.
+	channelzID *channelz.Identifier  // Channelz identifier for the channel.
 }
 
 // newCCResolverWrapper uses the resolver.Builder to build a Resolver and
 // returns a ccResolverWrapper object which wraps the newly built resolver.
-func newCCResolverWrapper(cc *ClientConn, rb resolver.Builder) (*ccResolverWrapper, error) {
+func newCCResolverWrapper(cc resolverStateUpdater, opts ccResolverWrapperOpts) (*ccResolverWrapper, error) {
+	ctx, cancel := context.WithCancel(context.Background())
 	ccr := &ccResolverWrapper{
-		cc:   cc,
+		cc:                  cc,
-		done: grpcsync.NewEvent(),
+		channelzID:          opts.channelzID,
+		ignoreServiceConfig: opts.bOpts.DisableServiceConfig,
+		opts:                opts,
+		serializer:          grpcsync.NewCallbackSerializer(ctx),
+		serializerCancel:    cancel,
 	}
 
-	var credsClone credentials.TransportCredentials
+	// Cannot hold the lock at build time because the resolver can send an
-	if creds := cc.dopts.copts.TransportCredentials; creds != nil {
+	// update or error inline and these incoming calls grab the lock to schedule
-		credsClone = creds.Clone()
+	// a callback in the serializer.
-	}
+	r, err := opts.builder.Build(opts.target, ccr, opts.bOpts)
-	rbo := resolver.BuildOptions{
-		DisableServiceConfig: cc.dopts.disableServiceConfig,
-		DialCreds:            credsClone,
-		CredsBundle:          cc.dopts.copts.CredsBundle,
-		Dialer:               cc.dopts.copts.Dialer,
-	}
-
-	var err error
-	// We need to hold the lock here while we assign to the ccr.resolver field
-	// to guard against a data race caused by the following code path,
-	// rb.Build-->ccr.ReportError-->ccr.poll-->ccr.resolveNow, would end up
-	// accessing ccr.resolver which is being assigned here.
-	ccr.resolverMu.Lock()
-	defer ccr.resolverMu.Unlock()
-	ccr.resolver, err = rb.Build(cc.parsedTarget, ccr, rbo)
 	if err != nil {
+		cancel()
 		return nil, err
 	}
+
+	// Any error reported by the resolver at build time that leads to a
+	// re-resolution request from the balancer is dropped by grpc until we
+	// return from this function. So, we don't have to handle pending resolveNow
+	// requests here.
+	ccr.mu.Lock()
+	ccr.resolver = r
+	ccr.mu.Unlock()
+
 	return ccr, nil
 }
 
 func (ccr *ccResolverWrapper) resolveNow(o resolver.ResolveNowOptions) {
-	ccr.resolverMu.Lock()
+	ccr.mu.Lock()
-	if !ccr.done.HasFired() {
+	defer ccr.mu.Unlock()
-		ccr.resolver.ResolveNow(o)
+
+	// ccr.resolver field is set only after the call to Build() returns. But in
+	// the process of building, the resolver may send an error update which when
+	// propagated to the balancer may result in a re-resolution request.
+	if ccr.closed || ccr.resolver == nil {
+		return
 	}
-	ccr.resolverMu.Unlock()
+	ccr.resolver.ResolveNow(o)
 }
 
 func (ccr *ccResolverWrapper) close() {
-	ccr.resolverMu.Lock()
+	ccr.mu.Lock()
-	ccr.resolver.Close()
+	if ccr.closed {
-	ccr.done.Fire()
+		ccr.mu.Unlock()
-	ccr.resolverMu.Unlock()
+		return
+	}
+
+	channelz.Info(logger, ccr.channelzID, "Closing the name resolver")
+
+	// Close the serializer to ensure that no more calls from the resolver are
+	// handled, before actually closing the resolver.
+	ccr.serializerCancel()
+	ccr.closed = true
+	r := ccr.resolver
+	ccr.mu.Unlock()
+
+	// Give enqueued callbacks a chance to finish.
+	<-ccr.serializer.Done
+
+	// Spawn a goroutine to close the resolver (since it may block trying to
+	// cleanup all allocated resources) and return early.
+	go r.Close()
 }
 
+// serializerScheduleLocked is a convenience method to schedule a function to be
+// run on the serializer while holding ccr.mu.
+func (ccr *ccResolverWrapper) serializerScheduleLocked(f func(context.Context)) {
+	ccr.mu.Lock()
+	ccr.serializer.Schedule(f)
+	ccr.mu.Unlock()
+}
+
+// UpdateState is called by resolver implementations to report new state to gRPC
+// which includes addresses and service config.
 func (ccr *ccResolverWrapper) UpdateState(s resolver.State) error {
-	ccr.incomingMu.Lock()
+	errCh := make(chan error, 1)
-	defer ccr.incomingMu.Unlock()
+	ok := ccr.serializer.Schedule(func(context.Context) {
-	if ccr.done.HasFired() {
+		ccr.addChannelzTraceEvent(s)
+		ccr.curState = s
+		if err := ccr.cc.updateResolverState(ccr.curState, nil); err == balancer.ErrBadResolverState {
+			errCh <- balancer.ErrBadResolverState
+			return
+		}
+		errCh <- nil
+	})
+	if !ok {
+		// The only time when Schedule() fail to add the callback to the
+		// serializer is when the serializer is closed, and this happens only
+		// when the resolver wrapper is closed.
 		return nil
 	}
-	ccr.addChannelzTraceEvent(s)
+	return <-errCh
-	ccr.curState = s
-	if err := ccr.cc.updateResolverState(ccr.curState, nil); err == balancer.ErrBadResolverState {
-		return balancer.ErrBadResolverState
-	}
-	return nil
 }
 
+// ReportError is called by resolver implementations to report errors
+// encountered during name resolution to gRPC.
 func (ccr *ccResolverWrapper) ReportError(err error) {
-	ccr.incomingMu.Lock()
+	ccr.serializerScheduleLocked(func(_ context.Context) {
-	defer ccr.incomingMu.Unlock()
+		channelz.Warningf(logger, ccr.channelzID, "ccResolverWrapper: reporting error to cc: %v", err)
-	if ccr.done.HasFired() {
+		ccr.cc.updateResolverState(resolver.State{}, err)
-		return
+	})
-	}
-	channelz.Warningf(logger, ccr.cc.channelzID, "ccResolverWrapper: reporting error to cc: %v", err)
-	ccr.cc.updateResolverState(resolver.State{}, err)
 }
 
-// NewAddress is called by the resolver implementation to send addresses to gRPC.
+// NewAddress is called by the resolver implementation to send addresses to
+// gRPC.
 func (ccr *ccResolverWrapper) NewAddress(addrs []resolver.Address) {
-	ccr.incomingMu.Lock()
+	ccr.serializerScheduleLocked(func(_ context.Context) {
-	defer ccr.incomingMu.Unlock()
+		ccr.addChannelzTraceEvent(resolver.State{Addresses: addrs, ServiceConfig: ccr.curState.ServiceConfig})
-	if ccr.done.HasFired() {
+		ccr.curState.Addresses = addrs
-		return
+		ccr.cc.updateResolverState(ccr.curState, nil)
-	}
+	})
-	ccr.addChannelzTraceEvent(resolver.State{Addresses: addrs, ServiceConfig: ccr.curState.ServiceConfig})
-	ccr.curState.Addresses = addrs
-	ccr.cc.updateResolverState(ccr.curState, nil)
 }
 
 // NewServiceConfig is called by the resolver implementation to send service
 // configs to gRPC.
 func (ccr *ccResolverWrapper) NewServiceConfig(sc string) {
-	ccr.incomingMu.Lock()
+	ccr.serializerScheduleLocked(func(_ context.Context) {
-	defer ccr.incomingMu.Unlock()
+		channelz.Infof(logger, ccr.channelzID, "ccResolverWrapper: got new service config: %s", sc)
-	if ccr.done.HasFired() {
+		if ccr.ignoreServiceConfig {
-		return
+			channelz.Info(logger, ccr.channelzID, "Service config lookups disabled; ignoring config")
-	}
+			return
-	channelz.Infof(logger, ccr.cc.channelzID, "ccResolverWrapper: got new service config: %s", sc)
+		}
-	if ccr.cc.dopts.disableServiceConfig {
+		scpr := parseServiceConfig(sc)
-		channelz.Info(logger, ccr.cc.channelzID, "Service config lookups disabled; ignoring config")
+		if scpr.Err != nil {
-		return
+			channelz.Warningf(logger, ccr.channelzID, "ccResolverWrapper: error parsing service config: %v", scpr.Err)
-	}
+			return
-	scpr := parseServiceConfig(sc)
+		}
-	if scpr.Err != nil {
+		ccr.addChannelzTraceEvent(resolver.State{Addresses: ccr.curState.Addresses, ServiceConfig: scpr})
-		channelz.Warningf(logger, ccr.cc.channelzID, "ccResolverWrapper: error parsing service config: %v", scpr.Err)
+		ccr.curState.ServiceConfig = scpr
-		return
+		ccr.cc.updateResolverState(ccr.curState, nil)
-	}
+	})
-	ccr.addChannelzTraceEvent(resolver.State{Addresses: ccr.curState.Addresses, ServiceConfig: scpr})
-	ccr.curState.ServiceConfig = scpr
-	ccr.cc.updateResolverState(ccr.curState, nil)
 }
 
+// ParseServiceConfig is called by resolver implementations to parse a JSON
+// representation of the service config.
 func (ccr *ccResolverWrapper) ParseServiceConfig(scJSON string) *serviceconfig.ParseResult {
 	return parseServiceConfig(scJSON)
 }
 
+// addChannelzTraceEvent adds a channelz trace event containing the new
+// state received from resolver implementations.
 func (ccr *ccResolverWrapper) addChannelzTraceEvent(s resolver.State) {
 	var updates []string
 	var oldSC, newSC *ServiceConfig
@@ -172,5 +235,5 @@ func (ccr *ccResolverWrapper) addChannelzTraceEvent(s resolver.State) {
 	} else if len(ccr.curState.Addresses) == 0 && len(s.Addresses) > 0 {
 		updates = append(updates, "resolver returned new addresses")
 	}
-	channelz.Infof(logger, ccr.cc.channelzID, "Resolver state updated: %s (%v)", pretty.ToJSON(s), strings.Join(updates, "; "))
+	channelz.Infof(logger, ccr.channelzID, "Resolver state updated: %s (%v)", pretty.ToJSON(s), strings.Join(updates, "; "))
 }

vendor/google.golang.org/grpc/rpc_util.go

@@ -159,6 +159,7 @@ type callInfo struct {
 	contentSubtype        string
 	codec                 baseCodec
 	maxRetryRPCBufferSize int
+	onFinish              []func(err error)
 }
 
 func defaultCallInfo() *callInfo {
@@ -295,6 +296,41 @@ func (o FailFastCallOption) before(c *callInfo) error {
 }
 func (o FailFastCallOption) after(c *callInfo, attempt *csAttempt) {}
 
+// OnFinish returns a CallOption that configures a callback to be called when
+// the call completes. The error passed to the callback is the status of the
+// RPC, and may be nil. The onFinish callback provided will only be called once
+// by gRPC. This is mainly used to be used by streaming interceptors, to be
+// notified when the RPC completes along with information about the status of
+// the RPC.
+//
+// # Experimental
+//
+// Notice: This API is EXPERIMENTAL and may be changed or removed in a
+// later release.
+func OnFinish(onFinish func(err error)) CallOption {
+	return OnFinishCallOption{
+		OnFinish: onFinish,
+	}
+}
+
+// OnFinishCallOption is CallOption that indicates a callback to be called when
+// the call completes.
+//
+// # Experimental
+//
+// Notice: This type is EXPERIMENTAL and may be changed or removed in a
+// later release.
+type OnFinishCallOption struct {
+	OnFinish func(error)
+}
+
+func (o OnFinishCallOption) before(c *callInfo) error {
+	c.onFinish = append(c.onFinish, o.OnFinish)
+	return nil
+}
+
+func (o OnFinishCallOption) after(c *callInfo, attempt *csAttempt) {}
+
 // MaxCallRecvMsgSize returns a CallOption which sets the maximum message size
 // in bytes the client can receive. If this is not set, gRPC uses the default
 // 4MB.
@@ -658,12 +694,13 @@ func msgHeader(data, compData []byte) (hdr []byte, payload []byte) {
 
 func outPayload(client bool, msg interface{}, data, payload []byte, t time.Time) *stats.OutPayload {
 	return &stats.OutPayload{
-		Client:     client,
+		Client:           client,
-		Payload:    msg,
+		Payload:          msg,
-		Data:       data,
+		Data:             data,
-		Length:     len(data),
+		Length:           len(data),
-		WireLength: len(payload) + headerLen,
+		WireLength:       len(payload) + headerLen,
-		SentTime:   t,
+		CompressedLength: len(payload),
+		SentTime:         t,
 	}
 }
 
@@ -684,7 +721,7 @@ func checkRecvPayload(pf payloadFormat, recvCompress string, haveCompressor bool
 }
 
 type payloadInfo struct {
-	wireLength        int // The compressed length got from wire.
+	compressedLength  int // The compressed length got from wire.
 	uncompressedBytes []byte
 }
 
@@ -694,7 +731,7 @@ func recvAndDecompress(p *parser, s *transport.Stream, dc Decompressor, maxRecei
 		return nil, err
 	}
 	if payInfo != nil {
-		payInfo.wireLength = len(d)
+		payInfo.compressedLength = len(d)
 	}
 
 	if st := checkRecvPayload(pf, s.RecvCompress(), compressor != nil || dc != nil); st != nil {

vendor/google.golang.org/grpc/server.go

@@ -43,8 +43,8 @@ import (
 	"google.golang.org/grpc/internal"
 	"google.golang.org/grpc/internal/binarylog"
 	"google.golang.org/grpc/internal/channelz"
-	"google.golang.org/grpc/internal/grpcrand"
 	"google.golang.org/grpc/internal/grpcsync"
+	"google.golang.org/grpc/internal/grpcutil"
 	"google.golang.org/grpc/internal/transport"
 	"google.golang.org/grpc/keepalive"
 	"google.golang.org/grpc/metadata"
@@ -74,10 +74,10 @@ func init() {
 		srv.drainServerTransports(addr)
 	}
 	internal.AddGlobalServerOptions = func(opt ...ServerOption) {
-		extraServerOptions = append(extraServerOptions, opt...)
+		globalServerOptions = append(globalServerOptions, opt...)
 	}
 	internal.ClearGlobalServerOptions = func() {
-		extraServerOptions = nil
+		globalServerOptions = nil
 	}
 	internal.BinaryLogger = binaryLogger
 	internal.JoinServerOptions = newJoinServerOption
@@ -115,12 +115,6 @@ type serviceInfo struct {
 	mdata       interface{}
 }
 
-type serverWorkerData struct {
-	st     transport.ServerTransport
-	wg     *sync.WaitGroup
-	stream *transport.Stream
-}
-
 // Server is a gRPC server to serve RPC requests.
 type Server struct {
 	opts serverOptions
@@ -145,7 +139,7 @@ type Server struct {
 	channelzID *channelz.Identifier
 	czData     *channelzData
 
-	serverWorkerChannels []chan *serverWorkerData
+	serverWorkerChannel chan func()
 }
 
 type serverOptions struct {
@@ -177,13 +171,14 @@ type serverOptions struct {
 }
 
 var defaultServerOptions = serverOptions{
+	maxConcurrentStreams:  math.MaxUint32,
 	maxReceiveMessageSize: defaultServerMaxReceiveMessageSize,
 	maxSendMessageSize:    defaultServerMaxSendMessageSize,
 	connectionTimeout:     120 * time.Second,
 	writeBufferSize:       defaultWriteBufSize,
 	readBufferSize:        defaultReadBufSize,
 }
-var extraServerOptions []ServerOption
+var globalServerOptions []ServerOption
 
 // A ServerOption sets options such as credentials, codec and keepalive parameters, etc.
 type ServerOption interface {
@@ -387,6 +382,9 @@ func MaxSendMsgSize(m int) ServerOption {
 // MaxConcurrentStreams returns a ServerOption that will apply a limit on the number
 // of concurrent streams to each ServerTransport.
 func MaxConcurrentStreams(n uint32) ServerOption {
+	if n == 0 {
+		n = math.MaxUint32
+	}
 	return newFuncServerOption(func(o *serverOptions) {
 		o.maxConcurrentStreams = n
 	})
@@ -560,47 +558,40 @@ func NumStreamWorkers(numServerWorkers uint32) ServerOption {
 const serverWorkerResetThreshold = 1 << 16
 
 // serverWorkers blocks on a *transport.Stream channel forever and waits for
-// data to be fed by serveStreams. This allows different requests to be
+// data to be fed by serveStreams. This allows multiple requests to be
 // processed by the same goroutine, removing the need for expensive stack
 // re-allocations (see the runtime.morestack problem [1]).
 //
 // [1] https://github.com/golang/go/issues/18138
-func (s *Server) serverWorker(ch chan *serverWorkerData) {
+func (s *Server) serverWorker() {
-	// To make sure all server workers don't reset at the same time, choose a
+	for completed := 0; completed < serverWorkerResetThreshold; completed++ {
-	// random number of iterations before resetting.
+		f, ok := <-s.serverWorkerChannel
-	threshold := serverWorkerResetThreshold + grpcrand.Intn(serverWorkerResetThreshold)
-	for completed := 0; completed < threshold; completed++ {
-		data, ok := <-ch
 		if !ok {
 			return
 		}
-		s.handleStream(data.st, data.stream, s.traceInfo(data.st, data.stream))
+		f()
-		data.wg.Done()
 	}
-	go s.serverWorker(ch)
+	go s.serverWorker()
 }
 
-// initServerWorkers creates worker goroutines and channels to process incoming
+// initServerWorkers creates worker goroutines and a channel to process incoming
 // connections to reduce the time spent overall on runtime.morestack.
 func (s *Server) initServerWorkers() {
-	s.serverWorkerChannels = make([]chan *serverWorkerData, s.opts.numServerWorkers)
+	s.serverWorkerChannel = make(chan func())
 	for i := uint32(0); i < s.opts.numServerWorkers; i++ {
-		s.serverWorkerChannels[i] = make(chan *serverWorkerData)
+		go s.serverWorker()
-		go s.serverWorker(s.serverWorkerChannels[i])
 	}
 }
 
 func (s *Server) stopServerWorkers() {
-	for i := uint32(0); i < s.opts.numServerWorkers; i++ {
+	close(s.serverWorkerChannel)
-		close(s.serverWorkerChannels[i])
-	}
 }
 
 // NewServer creates a gRPC server which has no service registered and has not
 // started to accept requests yet.
 func NewServer(opt ...ServerOption) *Server {
 	opts := defaultServerOptions
-	for _, o := range extraServerOptions {
+	for _, o := range globalServerOptions {
 		o.apply(&opts)
 	}
 	for _, o := range opt {
@@ -897,7 +888,7 @@ func (s *Server) drainServerTransports(addr string) {
 	s.mu.Lock()
 	conns := s.conns[addr]
 	for st := range conns {
-		st.Drain()
+		st.Drain("")
 	}
 	s.mu.Unlock()
 }
@@ -945,26 +936,26 @@ func (s *Server) serveStreams(st transport.ServerTransport) {
 	defer st.Close(errors.New("finished serving streams for the server transport"))
 	var wg sync.WaitGroup
 
-	var roundRobinCounter uint32
+	streamQuota := newHandlerQuota(s.opts.maxConcurrentStreams)
 	st.HandleStreams(func(stream *transport.Stream) {
 		wg.Add(1)
+
+		streamQuota.acquire()
+		f := func() {
+			defer streamQuota.release()
+			defer wg.Done()
+			s.handleStream(st, stream, s.traceInfo(st, stream))
+		}
+
 		if s.opts.numServerWorkers > 0 {
-			data := &serverWorkerData{st: st, wg: &wg, stream: stream}
 			select {
-			case s.serverWorkerChannels[atomic.AddUint32(&roundRobinCounter, 1)%s.opts.numServerWorkers] <- data:
+			case s.serverWorkerChannel <- f:
+				return
 			default:
 				// If all stream workers are busy, fallback to the default code path.
-				go func() {
-					s.handleStream(st, stream, s.traceInfo(st, stream))
-					wg.Done()
-				}()
 			}
-		} else {
-			go func() {
-				defer wg.Done()
-				s.handleStream(st, stream, s.traceInfo(st, stream))
-			}()
 		}
+		go f()
 	}, func(ctx context.Context, method string) context.Context {
 		if !EnableTracing {
 			return ctx
@@ -1053,7 +1044,7 @@ func (s *Server) addConn(addr string, st transport.ServerTransport) bool {
 	if s.drain {
 		// Transport added after we drained our existing conns: drain it
 		// immediately.
-		st.Drain()
+		st.Drain("")
 	}
 
 	if s.conns[addr] == nil {
@@ -1252,7 +1243,7 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 			logEntry.PeerAddr = peer.Addr
 		}
 		for _, binlog := range binlogs {
-			binlog.Log(logEntry)
+			binlog.Log(ctx, logEntry)
 		}
 	}
 
@@ -1263,6 +1254,7 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 	var comp, decomp encoding.Compressor
 	var cp Compressor
 	var dc Decompressor
+	var sendCompressorName string
 
 	// If dc is set and matches the stream's compression, use it.  Otherwise, try
 	// to find a matching registered compressor for decomp.
@@ -1283,12 +1275,18 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 	// NOTE: this needs to be ahead of all handling, https://github.com/grpc/grpc-go/issues/686.
 	if s.opts.cp != nil {
 		cp = s.opts.cp
-		stream.SetSendCompress(cp.Type())
+		sendCompressorName = cp.Type()
 	} else if rc := stream.RecvCompress(); rc != "" && rc != encoding.Identity {
 		// Legacy compressor not specified; attempt to respond with same encoding.
 		comp = encoding.GetCompressor(rc)
 		if comp != nil {
-			stream.SetSendCompress(rc)
+			sendCompressorName = comp.Name()
+		}
+	}
+
+	if sendCompressorName != "" {
+		if err := stream.SetSendCompress(sendCompressorName); err != nil {
+			return status.Errorf(codes.Internal, "grpc: failed to set send compressor: %v", err)
 		}
 	}
 
@@ -1312,11 +1310,12 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 		}
 		for _, sh := range shs {
 			sh.HandleRPC(stream.Context(), &stats.InPayload{
-				RecvTime:   time.Now(),
+				RecvTime:         time.Now(),
-				Payload:    v,
+				Payload:          v,
-				WireLength: payInfo.wireLength + headerLen,
+				Length:           len(d),
-				Data:       d,
+				WireLength:       payInfo.compressedLength + headerLen,
-				Length:     len(d),
+				CompressedLength: payInfo.compressedLength,
+				Data:             d,
 			})
 		}
 		if len(binlogs) != 0 {
@@ -1324,7 +1323,7 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 				Message: d,
 			}
 			for _, binlog := range binlogs {
-				binlog.Log(cm)
+				binlog.Log(stream.Context(), cm)
 			}
 		}
 		if trInfo != nil {
@@ -1357,7 +1356,7 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 					Header: h,
 				}
 				for _, binlog := range binlogs {
-					binlog.Log(sh)
+					binlog.Log(stream.Context(), sh)
 				}
 			}
 			st := &binarylog.ServerTrailer{
@@ -1365,7 +1364,7 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 				Err:     appErr,
 			}
 			for _, binlog := range binlogs {
-				binlog.Log(st)
+				binlog.Log(stream.Context(), st)
 			}
 		}
 		return appErr
@@ -1375,6 +1374,11 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 	}
 	opts := &transport.Options{Last: true}
 
+	// Server handler could have set new compressor by calling SetSendCompressor.
+	// In case it is set, we need to use it for compressing outbound message.
+	if stream.SendCompress() != sendCompressorName {
+		comp = encoding.GetCompressor(stream.SendCompress())
+	}
 	if err := s.sendResponse(t, stream, reply, cp, opts, comp); err != nil {
 		if err == io.EOF {
 			// The entire stream is done (for unary RPC only).
@@ -1402,8 +1406,8 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 				Err:     appErr,
 			}
 			for _, binlog := range binlogs {
-				binlog.Log(sh)
+				binlog.Log(stream.Context(), sh)
-				binlog.Log(st)
+				binlog.Log(stream.Context(), st)
 			}
 		}
 		return err
@@ -1417,8 +1421,8 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 			Message: reply,
 		}
 		for _, binlog := range binlogs {
-			binlog.Log(sh)
+			binlog.Log(stream.Context(), sh)
-			binlog.Log(sm)
+			binlog.Log(stream.Context(), sm)
 		}
 	}
 	if channelz.IsOn() {
@@ -1430,17 +1434,16 @@ func (s *Server) processUnaryRPC(t transport.ServerTransport, stream *transport.
 	// TODO: Should we be logging if writing status failed here, like above?
 	// Should the logging be in WriteStatus?  Should we ignore the WriteStatus
 	// error or allow the stats handler to see it?
-	err = t.WriteStatus(stream, statusOK)
 	if len(binlogs) != 0 {
 		st := &binarylog.ServerTrailer{
 			Trailer: stream.Trailer(),
 			Err:     appErr,
 		}
 		for _, binlog := range binlogs {
-			binlog.Log(st)
+			binlog.Log(stream.Context(), st)
 		}
 	}
-	return err
+	return t.WriteStatus(stream, statusOK)
 }
 
 // chainStreamServerInterceptors chains all stream server interceptors into one.
@@ -1574,7 +1577,7 @@ func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transp
 			logEntry.PeerAddr = peer.Addr
 		}
 		for _, binlog := range ss.binlogs {
-			binlog.Log(logEntry)
+			binlog.Log(stream.Context(), logEntry)
 		}
 	}
 
@@ -1597,12 +1600,18 @@ func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transp
 	// NOTE: this needs to be ahead of all handling, https://github.com/grpc/grpc-go/issues/686.
 	if s.opts.cp != nil {
 		ss.cp = s.opts.cp
-		stream.SetSendCompress(s.opts.cp.Type())
+		ss.sendCompressorName = s.opts.cp.Type()
 	} else if rc := stream.RecvCompress(); rc != "" && rc != encoding.Identity {
 		// Legacy compressor not specified; attempt to respond with same encoding.
 		ss.comp = encoding.GetCompressor(rc)
 		if ss.comp != nil {
-			stream.SetSendCompress(rc)
+			ss.sendCompressorName = rc
+		}
+	}
+
+	if ss.sendCompressorName != "" {
+		if err := stream.SetSendCompress(ss.sendCompressorName); err != nil {
+			return status.Errorf(codes.Internal, "grpc: failed to set send compressor: %v", err)
 		}
 	}
 
@@ -1640,16 +1649,16 @@ func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transp
 			ss.trInfo.tr.SetError()
 			ss.mu.Unlock()
 		}
-		t.WriteStatus(ss.s, appStatus)
 		if len(ss.binlogs) != 0 {
 			st := &binarylog.ServerTrailer{
 				Trailer: ss.s.Trailer(),
 				Err:     appErr,
 			}
 			for _, binlog := range ss.binlogs {
-				binlog.Log(st)
+				binlog.Log(stream.Context(), st)
 			}
 		}
+		t.WriteStatus(ss.s, appStatus)
 		// TODO: Should we log an error from WriteStatus here and below?
 		return appErr
 	}
@@ -1658,17 +1667,16 @@ func (s *Server) processStreamingRPC(t transport.ServerTransport, stream *transp
 		ss.trInfo.tr.LazyLog(stringer("OK"), false)
 		ss.mu.Unlock()
 	}
-	err = t.WriteStatus(ss.s, statusOK)
 	if len(ss.binlogs) != 0 {
 		st := &binarylog.ServerTrailer{
 			Trailer: ss.s.Trailer(),
 			Err:     appErr,
 		}
 		for _, binlog := range ss.binlogs {
-			binlog.Log(st)
+			binlog.Log(stream.Context(), st)
 		}
 	}
-	return err
+	return t.WriteStatus(ss.s, statusOK)
 }
 
 func (s *Server) handleStream(t transport.ServerTransport, stream *transport.Stream, trInfo *traceInfo) {
@@ -1846,7 +1854,7 @@ func (s *Server) GracefulStop() {
 	if !s.drain {
 		for _, conns := range s.conns {
 			for st := range conns {
-				st.Drain()
+				st.Drain("graceful_stop")
 			}
 		}
 		s.drain = true
@@ -1935,6 +1943,60 @@ func SendHeader(ctx context.Context, md metadata.MD) error {
 	return nil
 }
 
+// SetSendCompressor sets a compressor for outbound messages from the server.
+// It must not be called after any event that causes headers to be sent
+// (see ServerStream.SetHeader for the complete list). Provided compressor is
+// used when below conditions are met:
+//
+//   - compressor is registered via encoding.RegisterCompressor
+//   - compressor name must exist in the client advertised compressor names
+//     sent in grpc-accept-encoding header. Use ClientSupportedCompressors to
+//     get client supported compressor names.
+//
+// The context provided must be the context passed to the server's handler.
+// It must be noted that compressor name encoding.Identity disables the
+// outbound compression.
+// By default, server messages will be sent using the same compressor with
+// which request messages were sent.
+//
+// It is not safe to call SetSendCompressor concurrently with SendHeader and
+// SendMsg.
+//
+// # Experimental
+//
+// Notice: This function is EXPERIMENTAL and may be changed or removed in a
+// later release.
+func SetSendCompressor(ctx context.Context, name string) error {
+	stream, ok := ServerTransportStreamFromContext(ctx).(*transport.Stream)
+	if !ok || stream == nil {
+		return fmt.Errorf("failed to fetch the stream from the given context")
+	}
+
+	if err := validateSendCompressor(name, stream.ClientAdvertisedCompressors()); err != nil {
+		return fmt.Errorf("unable to set send compressor: %w", err)
+	}
+
+	return stream.SetSendCompress(name)
+}
+
+// ClientSupportedCompressors returns compressor names advertised by the client
+// via grpc-accept-encoding header.
+//
+// The context provided must be the context passed to the server's handler.
+//
+// # Experimental
+//
+// Notice: This function is EXPERIMENTAL and may be changed or removed in a
+// later release.
+func ClientSupportedCompressors(ctx context.Context) ([]string, error) {
+	stream, ok := ServerTransportStreamFromContext(ctx).(*transport.Stream)
+	if !ok || stream == nil {
+		return nil, fmt.Errorf("failed to fetch the stream from the given context %v", ctx)
+	}
+
+	return strings.Split(stream.ClientAdvertisedCompressors(), ","), nil
+}
+
 // SetTrailer sets the trailer metadata that will be sent when an RPC returns.
 // When called more than once, all the provided metadata will be merged.
 //
@@ -1969,3 +2031,51 @@ type channelzServer struct {
 func (c *channelzServer) ChannelzMetric() *channelz.ServerInternalMetric {
 	return c.s.channelzMetric()
 }
+
+// validateSendCompressor returns an error when given compressor name cannot be
+// handled by the server or the client based on the advertised compressors.
+func validateSendCompressor(name, clientCompressors string) error {
+	if name == encoding.Identity {
+		return nil
+	}
+
+	if !grpcutil.IsCompressorNameRegistered(name) {
+		return fmt.Errorf("compressor not registered %q", name)
+	}
+
+	for _, c := range strings.Split(clientCompressors, ",") {
+		if c == name {
+			return nil // found match
+		}
+	}
+	return fmt.Errorf("client does not support compressor %q", name)
+}
+
+// atomicSemaphore implements a blocking, counting semaphore. acquire should be
+// called synchronously; release may be called asynchronously.
+type atomicSemaphore struct {
+	n    int64
+	wait chan struct{}
+}
+
+func (q *atomicSemaphore) acquire() {
+	if atomic.AddInt64(&q.n, -1) < 0 {
+		// We ran out of quota.  Block until a release happens.
+		<-q.wait
+	}
+}
+
+func (q *atomicSemaphore) release() {
+	// N.B. the "<= 0" check below should allow for this to work with multiple
+	// concurrent calls to acquire, but also note that with synchronous calls to
+	// acquire, as our system does, n will never be less than -1.  There are
+	// fairness issues (queuing) to consider if this was to be generalized.
+	if atomic.AddInt64(&q.n, 1) <= 0 {
+		// An acquire was waiting on us.  Unblock it.
+		q.wait <- struct{}{}
+	}
+}
+
+func newHandlerQuota(n uint32) *atomicSemaphore {
+	return &atomicSemaphore{n: int64(n), wait: make(chan struct{}, 1)}
+}

vendor/google.golang.org/grpc/service_config.go

@@ -23,8 +23,6 @@ import (
 	"errors"
 	"fmt"
 	"reflect"
-	"strconv"
-	"strings"
 	"time"
 
 	"google.golang.org/grpc/codes"
@@ -106,8 +104,8 @@ type healthCheckConfig struct {
 
 type jsonRetryPolicy struct {
 	MaxAttempts          int
-	InitialBackoff       string
+	InitialBackoff       internalserviceconfig.Duration
-	MaxBackoff           string
+	MaxBackoff           internalserviceconfig.Duration
 	BackoffMultiplier    float64
 	RetryableStatusCodes []codes.Code
 }
@@ -129,50 +127,6 @@ type retryThrottlingPolicy struct {
 	TokenRatio float64
 }
 
-func parseDuration(s *string) (*time.Duration, error) {
-	if s == nil {
-		return nil, nil
-	}
-	if !strings.HasSuffix(*s, "s") {
-		return nil, fmt.Errorf("malformed duration %q", *s)
-	}
-	ss := strings.SplitN((*s)[:len(*s)-1], ".", 3)
-	if len(ss) > 2 {
-		return nil, fmt.Errorf("malformed duration %q", *s)
-	}
-	// hasDigits is set if either the whole or fractional part of the number is
-	// present, since both are optional but one is required.
-	hasDigits := false
-	var d time.Duration
-	if len(ss[0]) > 0 {
-		i, err := strconv.ParseInt(ss[0], 10, 32)
-		if err != nil {
-			return nil, fmt.Errorf("malformed duration %q: %v", *s, err)
-		}
-		d = time.Duration(i) * time.Second
-		hasDigits = true
-	}
-	if len(ss) == 2 && len(ss[1]) > 0 {
-		if len(ss[1]) > 9 {
-			return nil, fmt.Errorf("malformed duration %q", *s)
-		}
-		f, err := strconv.ParseInt(ss[1], 10, 64)
-		if err != nil {
-			return nil, fmt.Errorf("malformed duration %q: %v", *s, err)
-		}
-		for i := 9; i > len(ss[1]); i-- {
-			f *= 10
-		}
-		d += time.Duration(f)
-		hasDigits = true
-	}
-	if !hasDigits {
-		return nil, fmt.Errorf("malformed duration %q", *s)
-	}
-
-	return &d, nil
-}
-
 type jsonName struct {
 	Service string
 	Method  string
@@ -201,7 +155,7 @@ func (j jsonName) generatePath() (string, error) {
 type jsonMC struct {
 	Name                    *[]jsonName
 	WaitForReady            *bool
-	Timeout                 *string
+	Timeout                 *internalserviceconfig.Duration
 	MaxRequestMessageBytes  *int64
 	MaxResponseMessageBytes *int64
 	RetryPolicy             *jsonRetryPolicy
@@ -252,15 +206,10 @@ func parseServiceConfig(js string) *serviceconfig.ParseResult {
 		if m.Name == nil {
 			continue
 		}
-		d, err := parseDuration(m.Timeout)
-		if err != nil {
-			logger.Warningf("grpc: unmarshaling service config %s: %v", js, err)
-			return &serviceconfig.ParseResult{Err: err}
-		}
 
 		mc := MethodConfig{
 			WaitForReady: m.WaitForReady,
-			Timeout:      d,
+			Timeout:      (*time.Duration)(m.Timeout),
 		}
 		if mc.RetryPolicy, err = convertRetryPolicy(m.RetryPolicy); err != nil {
 			logger.Warningf("grpc: unmarshaling service config %s: %v", js, err)
@@ -312,18 +261,10 @@ func convertRetryPolicy(jrp *jsonRetryPolicy) (p *internalserviceconfig.RetryPol
 	if jrp == nil {
 		return nil, nil
 	}
-	ib, err := parseDuration(&jrp.InitialBackoff)
-	if err != nil {
-		return nil, err
-	}
-	mb, err := parseDuration(&jrp.MaxBackoff)
-	if err != nil {
-		return nil, err
-	}
 
 	if jrp.MaxAttempts <= 1 ||
-		*ib <= 0 ||
+		jrp.InitialBackoff <= 0 ||
-		*mb <= 0 ||
+		jrp.MaxBackoff <= 0 ||
 		jrp.BackoffMultiplier <= 0 ||
 		len(jrp.RetryableStatusCodes) == 0 {
 		logger.Warningf("grpc: ignoring retry policy %v due to illegal configuration", jrp)
@@ -332,8 +273,8 @@ func convertRetryPolicy(jrp *jsonRetryPolicy) (p *internalserviceconfig.RetryPol
 
 	rp := &internalserviceconfig.RetryPolicy{
 		MaxAttempts:          jrp.MaxAttempts,
-		InitialBackoff:       *ib,
+		InitialBackoff:       time.Duration(jrp.InitialBackoff),
-		MaxBackoff:           *mb,
+		MaxBackoff:           time.Duration(jrp.MaxBackoff),
 		BackoffMultiplier:    jrp.BackoffMultiplier,
 		RetryableStatusCodes: make(map[codes.Code]bool),
 	}

vendor/google.golang.org/grpc/stats/stats.go

@@ -67,10 +67,18 @@ type InPayload struct {
 	Payload interface{}
 	// Data is the serialized message payload.
 	Data []byte
-	// Length is the length of uncompressed data.
+
+	// Length is the size of the uncompressed payload data. Does not include any
+	// framing (gRPC or HTTP/2).
 	Length int
-	// WireLength is the length of data on wire (compressed, signed, encrypted).
+	// CompressedLength is the size of the compressed payload data. Does not
+	// include any framing (gRPC or HTTP/2). Same as Length if compression not
+	// enabled.
+	CompressedLength int
+	// WireLength is the size of the compressed payload data plus gRPC framing.
+	// Does not include HTTP/2 framing.
 	WireLength int
+
 	// RecvTime is the time when the payload is received.
 	RecvTime time.Time
 }
@@ -129,9 +137,15 @@ type OutPayload struct {
 	Payload interface{}
 	// Data is the serialized message payload.
 	Data []byte
-	// Length is the length of uncompressed data.
+	// Length is the size of the uncompressed payload data. Does not include any
+	// framing (gRPC or HTTP/2).
 	Length int
-	// WireLength is the length of data on wire (compressed, signed, encrypted).
+	// CompressedLength is the size of the compressed payload data. Does not
+	// include any framing (gRPC or HTTP/2). Same as Length if compression not
+	// enabled.
+	CompressedLength int
+	// WireLength is the size of the compressed payload data plus gRPC framing.
+	// Does not include HTTP/2 framing.
 	WireLength int
 	// SentTime is the time when the payload is sent.
 	SentTime time.Time

vendor/google.golang.org/grpc/status/status.go

@@ -77,9 +77,18 @@ func FromProto(s *spb.Status) *Status {
 // FromError returns a Status representation of err.
 //
 //   - If err was produced by this package or implements the method `GRPCStatus()
-//     *Status`, the appropriate Status is returned.
+//     *Status` and `GRPCStatus()` does not return nil, or if err wraps a type
+//     satisfying this, the Status from `GRPCStatus()` is returned.  For wrapped
+//     errors, the message returned contains the entire err.Error() text and not
+//     just the wrapped status. In that case, ok is true.
 //
-//   - If err is nil, a Status is returned with codes.OK and no message.
+//   - If err is nil, a Status is returned with codes.OK and no message, and ok
+//     is true.
+//
+//   - If err implements the method `GRPCStatus() *Status` and `GRPCStatus()`
+//     returns nil (which maps to Codes.OK), or if err wraps a type
+//     satisfying this, a Status is returned with codes.Unknown and err's
+//     Error() message, and ok is false.
 //
 //   - Otherwise, err is an error not compatible with this package.  In this
 //     case, a Status is returned with codes.Unknown and err's Error() message,
@@ -88,10 +97,29 @@ func FromError(err error) (s *Status, ok bool) {
 	if err == nil {
 		return nil, true
 	}
-	if se, ok := err.(interface {
+	type grpcstatus interface{ GRPCStatus() *Status }
-		GRPCStatus() *Status
+	if gs, ok := err.(grpcstatus); ok {
-	}); ok {
+		if gs.GRPCStatus() == nil {
-		return se.GRPCStatus(), true
+			// Error has status nil, which maps to codes.OK. There
+			// is no sensible behavior for this, so we turn it into
+			// an error with codes.Unknown and discard the existing
+			// status.
+			return New(codes.Unknown, err.Error()), false
+		}
+		return gs.GRPCStatus(), true
+	}
+	var gs grpcstatus
+	if errors.As(err, &gs) {
+		if gs.GRPCStatus() == nil {
+			// Error wraps an error that has status nil, which maps
+			// to codes.OK.  There is no sensible behavior for this,
+			// so we turn it into an error with codes.Unknown and
+			// discard the existing status.
+			return New(codes.Unknown, err.Error()), false
+		}
+		p := gs.GRPCStatus().Proto()
+		p.Message = err.Error()
+		return status.FromProto(p), true
 	}
 	return New(codes.Unknown, err.Error()), false
 }
@@ -103,19 +131,16 @@ func Convert(err error) *Status {
 	return s
 }
 
-// Code returns the Code of the error if it is a Status error, codes.OK if err
+// Code returns the Code of the error if it is a Status error or if it wraps a
-// is nil, or codes.Unknown otherwise.
+// Status error. If that is not the case, it returns codes.OK if err is nil, or
+// codes.Unknown otherwise.
 func Code(err error) codes.Code {
 	// Don't use FromError to avoid allocation of OK status.
 	if err == nil {
 		return codes.OK
 	}
-	if se, ok := err.(interface {
+
-		GRPCStatus() *Status
+	return Convert(err).Code()
-	}); ok {
-		return se.GRPCStatus().Code()
-	}
-	return codes.Unknown
 }
 
 // FromContextError converts a context error or wrapped context error into a

vendor/google.golang.org/grpc/stream.go

@@ -123,6 +123,9 @@ type ClientStream interface {
 	// calling RecvMsg on the same stream at the same time, but it is not safe
 	// to call SendMsg on the same stream in different goroutines. It is also
 	// not safe to call CloseSend concurrently with SendMsg.
+	//
+	// It is not safe to modify the message after calling SendMsg. Tracing
+	// libraries and stats handlers may use the message lazily.
 	SendMsg(m interface{}) error
 	// RecvMsg blocks until it receives a message into m or the stream is
 	// done. It returns io.EOF when the stream completes successfully. On
@@ -152,6 +155,11 @@ type ClientStream interface {
 // If none of the above happen, a goroutine and a context will be leaked, and grpc
 // will not call the optionally-configured stats handler with a stats.End message.
 func (cc *ClientConn) NewStream(ctx context.Context, desc *StreamDesc, method string, opts ...CallOption) (ClientStream, error) {
+	if err := cc.idlenessMgr.onCallBegin(); err != nil {
+		return nil, err
+	}
+	defer cc.idlenessMgr.onCallEnd()
+
 	// allow interceptor to see all applicable call options, which means those
 	// configured as defaults from dial option as well as per-call options
 	opts = combine(cc.dopts.callOptions, opts)
@@ -168,10 +176,19 @@ func NewClientStream(ctx context.Context, desc *StreamDesc, cc *ClientConn, meth
 }
 
 func newClientStream(ctx context.Context, desc *StreamDesc, cc *ClientConn, method string, opts ...CallOption) (_ ClientStream, err error) {
-	if md, _, ok := metadata.FromOutgoingContextRaw(ctx); ok {
+	if md, added, ok := metadata.FromOutgoingContextRaw(ctx); ok {
+		// validate md
 		if err := imetadata.Validate(md); err != nil {
 			return nil, status.Error(codes.Internal, err.Error())
 		}
+		// validate added
+		for _, kvs := range added {
+			for i := 0; i < len(kvs); i += 2 {
+				if err := imetadata.ValidatePair(kvs[i], kvs[i+1]); err != nil {
+					return nil, status.Error(codes.Internal, err.Error())
+				}
+			}
+		}
 	}
 	if channelz.IsOn() {
 		cc.incrCallsStarted()
@@ -352,7 +369,7 @@ func newClientStreamWithParams(ctx context.Context, desc *StreamDesc, cc *Client
 			}
 		}
 		for _, binlog := range cs.binlogs {
-			binlog.Log(logEntry)
+			binlog.Log(cs.ctx, logEntry)
 		}
 	}
 
@@ -460,7 +477,7 @@ func (a *csAttempt) newStream() error {
 	// It is safe to overwrite the csAttempt's context here, since all state
 	// maintained in it are local to the attempt. When the attempt has to be
 	// retried, a new instance of csAttempt will be created.
-	if a.pickResult.Metatada != nil {
+	if a.pickResult.Metadata != nil {
 		// We currently do not have a function it the metadata package which
 		// merges given metadata with existing metadata in a context. Existing
 		// function `AppendToOutgoingContext()` takes a variadic argument of key
@@ -470,7 +487,7 @@ func (a *csAttempt) newStream() error {
 		// in a form passable to AppendToOutgoingContext(), or create a version
 		// of AppendToOutgoingContext() that accepts a metadata.MD.
 		md, _ := metadata.FromOutgoingContext(a.ctx)
-		md = metadata.Join(md, a.pickResult.Metatada)
+		md = metadata.Join(md, a.pickResult.Metadata)
 		a.ctx = metadata.NewOutgoingContext(a.ctx, md)
 	}
 
@@ -800,7 +817,7 @@ func (cs *clientStream) Header() (metadata.MD, error) {
 		}
 		cs.serverHeaderBinlogged = true
 		for _, binlog := range cs.binlogs {
-			binlog.Log(logEntry)
+			binlog.Log(cs.ctx, logEntry)
 		}
 	}
 	return m, nil
@@ -881,7 +898,7 @@ func (cs *clientStream) SendMsg(m interface{}) (err error) {
 			Message:      data,
 		}
 		for _, binlog := range cs.binlogs {
-			binlog.Log(cm)
+			binlog.Log(cs.ctx, cm)
 		}
 	}
 	return err
@@ -905,7 +922,7 @@ func (cs *clientStream) RecvMsg(m interface{}) error {
 			Message:      recvInfo.uncompressedBytes,
 		}
 		for _, binlog := range cs.binlogs {
-			binlog.Log(sm)
+			binlog.Log(cs.ctx, sm)
 		}
 	}
 	if err != nil || !cs.desc.ServerStreams {
@@ -926,7 +943,7 @@ func (cs *clientStream) RecvMsg(m interface{}) error {
 				logEntry.PeerAddr = peer.Addr
 			}
 			for _, binlog := range cs.binlogs {
-				binlog.Log(logEntry)
+				binlog.Log(cs.ctx, logEntry)
 			}
 		}
 	}
@@ -953,7 +970,7 @@ func (cs *clientStream) CloseSend() error {
 			OnClientSide: true,
 		}
 		for _, binlog := range cs.binlogs {
-			binlog.Log(chc)
+			binlog.Log(cs.ctx, chc)
 		}
 	}
 	// We never returned an error here for reasons.
@@ -971,6 +988,9 @@ func (cs *clientStream) finish(err error) {
 		return
 	}
 	cs.finished = true
+	for _, onFinish := range cs.callInfo.onFinish {
+		onFinish(err)
+	}
 	cs.commitAttemptLocked()
 	if cs.attempt != nil {
 		cs.attempt.finish(err)
@@ -992,7 +1012,7 @@ func (cs *clientStream) finish(err error) {
 			OnClientSide: true,
 		}
 		for _, binlog := range cs.binlogs {
-			binlog.Log(c)
+			binlog.Log(cs.ctx, c)
 		}
 	}
 	if err == nil {
@@ -1081,9 +1101,10 @@ func (a *csAttempt) recvMsg(m interface{}, payInfo *payloadInfo) (err error) {
 			RecvTime: time.Now(),
 			Payload:  m,
 			// TODO truncate large payload.
-			Data:       payInfo.uncompressedBytes,
+			Data:             payInfo.uncompressedBytes,
-			WireLength: payInfo.wireLength + headerLen,
+			WireLength:       payInfo.compressedLength + headerLen,
-			Length:     len(payInfo.uncompressedBytes),
+			CompressedLength: payInfo.compressedLength,
+			Length:           len(payInfo.uncompressedBytes),
 		})
 	}
 	if channelz.IsOn() {
@@ -1252,14 +1273,19 @@ func newNonRetryClientStream(ctx context.Context, desc *StreamDesc, method strin
 	as.p = &parser{r: s}
 	ac.incrCallsStarted()
 	if desc != unaryStreamDesc {
-		// Listen on cc and stream contexts to cleanup when the user closes the
+		// Listen on stream context to cleanup when the stream context is
-		// ClientConn or cancels the stream context.  In all other cases, an error
+		// canceled.  Also listen for the addrConn's context in case the
-		// should already be injected into the recv buffer by the transport, which
+		// addrConn is closed or reconnects to a different address.  In all
-		// the client will eventually receive, and then we will cancel the stream's
+		// other cases, an error should already be injected into the recv
-		// context in clientStream.finish.
+		// buffer by the transport, which the client will eventually receive,
+		// and then we will cancel the stream's context in
+		// addrConnStream.finish.
 		go func() {
+			ac.mu.Lock()
+			acCtx := ac.ctx
+			ac.mu.Unlock()
 			select {
-			case <-ac.ctx.Done():
+			case <-acCtx.Done():
 				as.finish(status.Error(codes.Canceled, "grpc: the SubConn is closing"))
 			case <-ctx.Done():
 				as.finish(toRPCErr(ctx.Err()))
@@ -1511,6 +1537,8 @@ type serverStream struct {
 	comp   encoding.Compressor
 	decomp encoding.Compressor
 
+	sendCompressorName string
+
 	maxReceiveMessageSize int
 	maxSendMessageSize    int
 	trInfo                *traceInfo
@@ -1558,7 +1586,7 @@ func (ss *serverStream) SendHeader(md metadata.MD) error {
 		}
 		ss.serverHeaderBinlogged = true
 		for _, binlog := range ss.binlogs {
-			binlog.Log(sh)
+			binlog.Log(ss.ctx, sh)
 		}
 	}
 	return err
@@ -1603,6 +1631,13 @@ func (ss *serverStream) SendMsg(m interface{}) (err error) {
 		}
 	}()
 
+	// Server handler could have set new compressor by calling SetSendCompressor.
+	// In case it is set, we need to use it for compressing outbound message.
+	if sendCompressorsName := ss.s.SendCompress(); sendCompressorsName != ss.sendCompressorName {
+		ss.comp = encoding.GetCompressor(sendCompressorsName)
+		ss.sendCompressorName = sendCompressorsName
+	}
+
 	// load hdr, payload, data
 	hdr, payload, data, err := prepareMsg(m, ss.codec, ss.cp, ss.comp)
 	if err != nil {
@@ -1624,14 +1659,14 @@ func (ss *serverStream) SendMsg(m interface{}) (err error) {
 			}
 			ss.serverHeaderBinlogged = true
 			for _, binlog := range ss.binlogs {
-				binlog.Log(sh)
+				binlog.Log(ss.ctx, sh)
 			}
 		}
 		sm := &binarylog.ServerMessage{
 			Message: data,
 		}
 		for _, binlog := range ss.binlogs {
-			binlog.Log(sm)
+			binlog.Log(ss.ctx, sm)
 		}
 	}
 	if len(ss.statsHandler) != 0 {
@@ -1679,7 +1714,7 @@ func (ss *serverStream) RecvMsg(m interface{}) (err error) {
 			if len(ss.binlogs) != 0 {
 				chc := &binarylog.ClientHalfClose{}
 				for _, binlog := range ss.binlogs {
-					binlog.Log(chc)
+					binlog.Log(ss.ctx, chc)
 				}
 			}
 			return err
@@ -1695,9 +1730,10 @@ func (ss *serverStream) RecvMsg(m interface{}) (err error) {
 				RecvTime: time.Now(),
 				Payload:  m,
 				// TODO truncate large payload.
-				Data:       payInfo.uncompressedBytes,
+				Data:             payInfo.uncompressedBytes,
-				WireLength: payInfo.wireLength + headerLen,
+				Length:           len(payInfo.uncompressedBytes),
-				Length:     len(payInfo.uncompressedBytes),
+				WireLength:       payInfo.compressedLength + headerLen,
+				CompressedLength: payInfo.compressedLength,
 			})
 		}
 	}
@@ -1706,7 +1742,7 @@ func (ss *serverStream) RecvMsg(m interface{}) (err error) {
 			Message: payInfo.uncompressedBytes,
 		}
 		for _, binlog := range ss.binlogs {
-			binlog.Log(cm)
+			binlog.Log(ss.ctx, cm)
 		}
 	}
 	return nil

vendor/google.golang.org/grpc/version.go

@@ -19,4 +19,4 @@
 package grpc
 
 // Version is the current grpc version.
-const Version = "1.53.0"
+const Version = "1.56.3"

vendor/google.golang.org/grpc/vet.sh

@@ -41,16 +41,8 @@ if [[ "$1" = "-install" ]]; then
     github.com/client9/misspell/cmd/misspell
   popd
   if [[ -z "${VET_SKIP_PROTO}" ]]; then
-    if [[ "${TRAVIS}" = "true" ]]; then
+    if [[ "${GITHUB_ACTIONS}" = "true" ]]; then
-      PROTOBUF_VERSION=3.14.0
+      PROTOBUF_VERSION=22.0 # a.k.a v4.22.0 in pb.go files.
-      PROTOC_FILENAME=protoc-${PROTOBUF_VERSION}-linux-x86_64.zip
-      pushd /home/travis
-      wget https://github.com/google/protobuf/releases/download/v${PROTOBUF_VERSION}/${PROTOC_FILENAME}
-      unzip ${PROTOC_FILENAME}
-      bin/protoc --version
-      popd
-    elif [[ "${GITHUB_ACTIONS}" = "true" ]]; then
-      PROTOBUF_VERSION=3.14.0
       PROTOC_FILENAME=protoc-${PROTOBUF_VERSION}-linux-x86_64.zip
       pushd /home/runner/go
       wget https://github.com/google/protobuf/releases/download/v${PROTOBUF_VERSION}/${PROTOC_FILENAME}
@@ -68,8 +60,7 @@ fi
 
 # - Check that generated proto files are up to date.
 if [[ -z "${VET_SKIP_PROTO}" ]]; then
-  PATH="/home/travis/bin:${PATH}" make proto && \
+  make proto && git status --porcelain 2>&1 | fail_on_output || \
-    git status --porcelain 2>&1 | fail_on_output || \
     (git status; git --no-pager diff; exit 1)
 fi
 

vendor/google.golang.org/protobuf/internal/version/version.go

@@ -51,8 +51,8 @@ import (
 //  10. Send out the CL for review and submit it.
 const (
 	Major      = 1
-	Minor      = 29
+	Minor      = 30
-	Patch      = 1
+	Patch      = 0
 	PreRelease = ""
 )
 

vendor/modules.txt

@@ -4,13 +4,13 @@ cloud.google.com/go/internal
 cloud.google.com/go/internal/optional
 cloud.google.com/go/internal/trace
 cloud.google.com/go/internal/version
-# cloud.google.com/go/compute v1.18.0
+# cloud.google.com/go/compute v1.19.1
 ## explicit; go 1.19
 cloud.google.com/go/compute/internal
 # cloud.google.com/go/compute/metadata v0.2.3
 ## explicit; go 1.19
 cloud.google.com/go/compute/metadata
-# cloud.google.com/go/iam v0.12.0
+# cloud.google.com/go/iam v0.13.0
 ## explicit; go 1.19
 cloud.google.com/go/iam
 cloud.google.com/go/iam/apiv1/iampb
@@ -194,7 +194,7 @@ github.com/golang-jwt/jwt/v4
 # github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e
 ## explicit
 github.com/golang/groupcache/lru
-# github.com/golang/protobuf v1.5.2
+# github.com/golang/protobuf v1.5.3
 ## explicit; go 1.9
 github.com/golang/protobuf/jsonpb
 github.com/golang/protobuf/proto
@@ -378,7 +378,7 @@ golang.org/x/net/http2/hpack
 golang.org/x/net/idna
 golang.org/x/net/internal/timeseries
 golang.org/x/net/trace
-# golang.org/x/oauth2 v0.6.0
+# golang.org/x/oauth2 v0.7.0
 ## explicit; go 1.17
 golang.org/x/oauth2
 golang.org/x/oauth2/authhandler
@@ -433,7 +433,7 @@ google.golang.org/appengine/internal/socket
 google.golang.org/appengine/internal/urlfetch
 google.golang.org/appengine/socket
 google.golang.org/appengine/urlfetch
-# google.golang.org/genproto v0.0.0-20230320184635-7606e756e683
+# google.golang.org/genproto v0.0.0-20230410155749-daa745c078e1
 ## explicit; go 1.19
 google.golang.org/genproto/googleapis/api
 google.golang.org/genproto/googleapis/api/annotations
@@ -442,7 +442,7 @@ google.golang.org/genproto/googleapis/rpc/errdetails
 google.golang.org/genproto/googleapis/rpc/status
 google.golang.org/genproto/googleapis/type/date
 google.golang.org/genproto/googleapis/type/expr
-# google.golang.org/grpc v1.53.0
+# google.golang.org/grpc v1.56.3
 ## explicit; go 1.17
 google.golang.org/grpc
 google.golang.org/grpc/attributes
@@ -504,7 +504,7 @@ google.golang.org/grpc/serviceconfig
 google.golang.org/grpc/stats
 google.golang.org/grpc/status
 google.golang.org/grpc/tap
-# google.golang.org/protobuf v1.29.1
+# google.golang.org/protobuf v1.30.0
 ## explicit; go 1.11
 google.golang.org/protobuf/encoding/protojson
 google.golang.org/protobuf/encoding/prototext