Merge pull request #27 from nspcc-dev/add-rpc-method-for-dumping-node-settings

Add rpc method for dumping node settings

docs/state.md

@@ -8,6 +8,8 @@
     - [Status](#state.Status)
     
   - Messages
+    - [DumpRequest](#state.DumpRequest)
+    - [DumpResponse](#state.DumpResponse)
     - [HealthRequest](#state.HealthRequest)
     - [HealthResponse](#state.HealthResponse)
     - [MetricsRequest](#state.MetricsRequest)
@@ -36,6 +38,7 @@ Status service provides node's healthcheck and status info
 rpc Netmap(NetmapRequest) returns (.bootstrap.SpreadMap);
 rpc Metrics(MetricsRequest) returns (MetricsResponse);
 rpc HealthCheck(HealthRequest) returns (HealthResponse);
+rpc DumpConfig(DumpRequest) returns (DumpResponse);
 
 ```
 
@@ -61,9 +64,42 @@ If node unhealthy field Status would contains detailed info.
 | Name | Input | Output |
 | ---- | ----- | ------ |
 | HealthCheck | [HealthRequest](#state.HealthRequest) | [HealthResponse](#state.HealthResponse) |
+#### Method DumpConfig
+
+DumpConfig request allows dumping settings for the current node.
+To permit access, used server config options.
+The request should be signed.
+
+| Name | Input | Output |
+| ---- | ----- | ------ |
+| DumpConfig | [DumpRequest](#state.DumpRequest) | [DumpResponse](#state.DumpResponse) |
  <!-- end services -->
 
 
+<a name="state.DumpRequest"></a>
+
+### Message DumpRequest
+DumpRequest message to fetch current server config.
+
+
+| Field | Type | Label | Description |
+| ----- | ---- | ----- | ----------- |
+| Meta | [service.RequestMetaHeader](#service.RequestMetaHeader) |  | RequestMetaHeader contains information about request meta headers (should be embedded into message) |
+| Verify | [service.RequestVerificationHeader](#service.RequestVerificationHeader) |  | RequestVerificationHeader is a set of signatures of every NeoFS Node that processed request (should be embedded into message) |
+
+
+<a name="state.DumpResponse"></a>
+
+### Message DumpResponse
+DumpResponse message contains current server config.
+Config stored in JSON encoded into slice of bytes.
+
+
+| Field | Type | Label | Description |
+| ----- | ---- | ----- | ----------- |
+| Config | [bytes](#bytes) |  |  |
+
+
 <a name="state.HealthRequest"></a>
 
 ### Message HealthRequest

go.mod

@@ -13,6 +13,7 @@ require (
 	github.com/pkg/errors v0.8.1
 	github.com/prometheus/client_golang v1.2.1
 	github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4
+	github.com/spf13/viper v1.6.1
 	github.com/stretchr/testify v1.4.0
 	golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550
 	google.golang.org/grpc v1.24.0

go.sum

@@ -1,61 +1,100 @@
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 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4 h1:gQz4mCbXsO+nc9n1hCxHcGA3Zx3Eo+UHZoInFGUIXNM=
 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
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 github.com/prometheus/procfs v0.0.2/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA=
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+golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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 golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20181228144115-9a3f9b0469bb/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@@ -131,19 +212,34 @@ golang.org/x/sys v0.0.0-20191010194322-b09406accb47 h1:/XfQ9z7ib8eEJX2hdgFTZJ/nt
 golang.org/x/sys v0.0.0-20191010194322-b09406accb47/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
+golang.org/x/tools v0.0.0-20180221164845-07fd8470d635/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20181030221726-6c7e314b6563/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
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state/service.go

@@ -1,9 +1,12 @@
 package state
 
 import (
+	"encoding/json"
+
 	"github.com/golang/protobuf/proto"
 	"github.com/prometheus/client_golang/prometheus"
 	dto "github.com/prometheus/client_model/go"
+	"github.com/spf13/viper"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
 )
@@ -46,3 +49,14 @@ func DecodeMetrics(r *MetricsResponse) ([]*MetricFamily, error) {
 
 	return metrics, nil
 }
+
+// EncodeConfig encodes viper settings into DumpConfig message,
+// if something went wrong returns gRPC Status error (can be returned from service).
+func EncodeConfig(v *viper.Viper) (*DumpResponse, error) {
+	data, err := json.Marshal(v.AllSettings())
+	if err != nil {
+		return nil, status.Error(codes.Internal, err.Error())
+	}
+
+	return &DumpResponse{Config: data}, nil
+}

state/service.proto

@@ -18,6 +18,10 @@ service Status {
     // HealthCheck request allows to check health status of the node.
     // If node unhealthy field Status would contains detailed info.
     rpc HealthCheck(HealthRequest) returns (HealthResponse);
+    // DumpConfig request allows dumping settings for the current node.
+    // To permit access, used server config options.
+    // The request should be signed.
+    rpc DumpConfig(DumpRequest) returns (DumpResponse);
 }
 
 // NetmapRequest message to request current node netmap
@@ -58,3 +62,17 @@ message HealthResponse {
     // Status contains detailed information about health status
     string Status = 2;
 }
+
+// DumpRequest message to fetch current server config.
+message DumpRequest {
+    // RequestMetaHeader contains information about request meta headers (should be embedded into message)
+    service.RequestMetaHeader Meta           = 98 [(gogoproto.embed) = true, (gogoproto.nullable) = false];
+    // RequestVerificationHeader is a set of signatures of every NeoFS Node that processed request (should be embedded into message)
+    service.RequestVerificationHeader Verify = 99 [(gogoproto.embed) = true, (gogoproto.nullable) = false];
+}
+
+// DumpResponse message contains current server config.
+// Config stored in JSON encoded into slice of bytes.
+message DumpResponse {
+    bytes Config = 1;
+}