Add NeoFS ObjectLayer and connection pool

go.mod

@@ -3,7 +3,7 @@ module github.com/minio/minio
 go 1.13
 
 require (
-	cloud.google.com/go v0.39.0
+	cloud.google.com/go/storage v1.0.0
 	contrib.go.opencensus.io/exporter/ocagent v0.5.0 // indirect
 	github.com/Azure/azure-pipeline-go v0.2.1
 	github.com/Azure/azure-storage-blob-go v0.8.0
@@ -19,10 +19,7 @@ require (
 	github.com/colinmarc/hdfs/v2 v2.1.1
 	github.com/coredns/coredns v1.4.0
 	github.com/coreos/bbolt v1.3.3 // indirect
-	github.com/coreos/etcd v3.3.12+incompatible
+	github.com/coreos/etcd v3.3.13+incompatible
-	github.com/coreos/go-semver v0.3.0 // indirect
-	github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e // indirect
-	github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f // indirect
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
 	github.com/djherbis/atime v1.0.0
 	github.com/dustin/go-humanize v1.0.0
@@ -34,24 +31,19 @@ require (
 	github.com/ghodss/yaml v1.0.1-0.20190212211648-25d852aebe32 // indirect
 	github.com/go-ole/go-ole v1.2.4 // indirect
 	github.com/go-sql-driver/mysql v1.5.0
-	github.com/gogo/protobuf v1.2.1 // indirect
+	github.com/gogo/protobuf v1.3.1
 	github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6 // indirect
 	github.com/gomodule/redigo v2.0.0+incompatible
-	github.com/google/btree v1.0.0 // indirect
 	github.com/google/uuid v1.1.1
 	github.com/gopherjs/gopherjs v0.0.0-20190328170749-bb2674552d8f // indirect
 	github.com/gorilla/handlers v1.4.2
 	github.com/gorilla/mux v1.7.4
 	github.com/gorilla/rpc v1.2.0
-	github.com/gorilla/websocket v1.4.1 // indirect
 	github.com/grpc-ecosystem/go-grpc-middleware v1.0.1-0.20190118093823-f849b5445de4 // indirect
-	github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0 // indirect
-	github.com/grpc-ecosystem/grpc-gateway v1.9.0 // indirect
 	github.com/hashicorp/go-hclog v0.9.2 // indirect
 	github.com/hashicorp/raft v1.1.1-0.20190703171940-f639636d18e0 // indirect
 	github.com/hashicorp/vault/api v1.0.4
 	github.com/inconshreveable/go-update v0.0.0-20160112193335-8152e7eb6ccf
-	github.com/jonboulle/clockwork v0.1.0 // indirect
 	github.com/json-iterator/go v1.1.10
 	github.com/klauspost/compress v1.10.3
 	github.com/klauspost/cpuid v1.3.0
@@ -74,8 +66,6 @@ require (
 	github.com/minio/sio v0.2.0
 	github.com/mitchellh/go-homedir v1.1.0
 	github.com/mmcloughlin/avo v0.0.0-20200303042253-6df701fe672f // indirect
-	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
-	github.com/modern-go/reflect2 v1.0.1 // indirect
 	github.com/montanaflynn/stats v0.5.0
 	github.com/nats-io/gnatsd v1.4.1 // indirect
 	github.com/nats-io/go-nats v1.7.2 // indirect
@@ -87,10 +77,12 @@ require (
 	github.com/nats-io/stan.go v0.4.5
 	github.com/ncw/directio v1.0.5
 	github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e // indirect
+	github.com/nspcc-dev/neofs-api-go v1.1.0
+	github.com/nspcc-dev/neofs-crypto v0.3.0
 	github.com/nsqio/go-nsq v1.0.7
 	github.com/philhofer/fwd v1.0.0 // indirect
-	github.com/pkg/errors v0.8.1
+	github.com/pkg/errors v0.9.1
-	github.com/prometheus/client_golang v0.9.3
+	github.com/prometheus/client_golang v1.6.0
 	github.com/rcrowley/go-metrics v0.0.0-20190704165056-9c2d0518ed81 // indirect
 	github.com/rjeczalik/notify v0.9.2
 	github.com/rs/cors v1.7.0
@@ -98,30 +90,23 @@ require (
 	github.com/shirou/gopsutil v2.20.3-0.20200314133625-53cec6b37e6a+incompatible
 	github.com/sirupsen/logrus v1.5.0
 	github.com/smartystreets/assertions v0.0.0-20190401211740-f487f9de1cd3 // indirect
-	github.com/smartystreets/goconvey v1.6.4 // indirect
+	github.com/spf13/viper v1.7.0
-	github.com/soheilhy/cmux v0.1.4 // indirect
-	github.com/spaolacci/murmur3 v1.1.0 // indirect
 	github.com/streadway/amqp v0.0.0-20190404075320-75d898a42a94
-	github.com/stretchr/testify v1.5.1 // indirect
+	github.com/stretchr/testify v1.5.1
 	github.com/tinylib/msgp v1.1.1
-	github.com/tmc/grpc-websocket-proxy v0.0.0-20190109142713-0ad062ec5ee5 // indirect
-	github.com/ugorji/go v1.1.5-pre // indirect
 	github.com/valyala/tcplisten v0.0.0-20161114210144-ceec8f93295a
 	github.com/willf/bitset v1.1.10 // indirect
 	github.com/willf/bloom v2.0.3+incompatible
 	github.com/xdg/scram v0.0.0-20180814205039-7eeb5667e42c
-	github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2 // indirect
 	go.etcd.io/bbolt v1.3.3 // indirect
-	go.uber.org/zap v1.15.0 // indirect
+	go.uber.org/atomic v1.6.0
+	go.uber.org/zap v1.15.0
 	golang.org/x/crypto v0.0.0-20200604202706-70a84ac30bf9
 	golang.org/x/net v0.0.0-20200602114024-627f9648deb9
-	golang.org/x/oauth2 v0.0.0-20190402181905-9f3314589c9a // indirect
 	golang.org/x/sys v0.0.0-20200610111108-226ff32320da
-	golang.org/x/text v0.3.2 // indirect
 	golang.org/x/tools v0.0.0-20200502202811-ed308ab3e770 // indirect
-	google.golang.org/api v0.5.0
+	google.golang.org/api v0.13.0
-	google.golang.org/appengine v1.6.0 // indirect
+	google.golang.org/grpc v1.29.1
-	google.golang.org/genproto v0.0.0-20190513181449-d00d292a067c // indirect
 	gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f // indirect
 	gopkg.in/cheggaaa/pb.v1 v1.0.28 // indirect
 	gopkg.in/ini.v1 v1.57.0 // indirect

go.sum

@@ -1,9 +1,23 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.39.0 h1:UgQP9na6OTfp4dsAiz/eFpFA1C6tPdH5wiRdi19tuMw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
-cloud.google.com/go v0.39.0/go.mod h1:rVLT6fkc8chs9sfPtFc1SBH6em7n+ZoXaG+87tDISts=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3 h1:AVXDdKsrtX33oR9fbCMu/+c1o8Ofjq6Ku/MInaLVg5Y=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go/bigquery v1.0.1 h1:hL+ycaJpVE9M7nLoiXb/Pn10ENE2u+oddxbD8uu0ZVU=
+cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
+cloud.google.com/go/datastore v1.0.0 h1:Kt+gOPPp2LEPWp8CSfxhsM8ik9CcyE/gYu+0r+RnZvM=
+cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
+cloud.google.com/go/firestore v1.1.0/go.mod h1:ulACoGHTpvq5r8rxGJ4ddJZBZqakUQqClKRT5SZwBmk=
+cloud.google.com/go/pubsub v1.0.1 h1:W9tAK3E57P75u0XLLR82LZyw8VpAnhmyTOxW9qzmyj8=
+cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
+cloud.google.com/go/storage v1.0.0 h1:VV2nUM3wwLLGh9lSABFgZMjInyUbJeaRSE64WuAIQ+4=
+cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
 contrib.go.opencensus.io/exporter/ocagent v0.5.0 h1:TKXjQSRS0/cCDrP7KvkgU6SmILtF/yV2TOs/02K/WZQ=
 contrib.go.opencensus.io/exporter/ocagent v0.5.0/go.mod h1:ImxhfLRpxoYiSq891pBrLVhN+qmP8BTVvdH2YLs7Gl0=
+dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 git.apache.org/thrift.git v0.13.0 h1:/3bz5WZ+sqYArk7MBBBbDufMxKKOA56/6JO6psDpUDY=
 git.apache.org/thrift.git v0.13.0/go.mod h1:fPE2ZNJGynbRyZ4dJvy6G277gSllfV2HJqblrnkyeyg=
 github.com/Azure/azure-pipeline-go v0.2.1 h1:OLBdZJ3yvOn2MezlWvbrBMTEUQC72zAftRZOMdj5HYo=
@@ -14,6 +28,7 @@ github.com/Azure/go-autorest v11.7.1+incompatible h1:M2YZIajBBVekV86x0rr1443Lc1F
 github.com/Azure/go-autorest v11.7.1+incompatible/go.mod h1:r+4oMnoxhatjLLJ6zxSWATqVooLgysK6ZNox3g/xq24=
 github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/DataDog/datadog-go v2.2.0+incompatible/go.mod h1:LButxg5PwREeZtORoXG3tL4fMGNddJ+vMq1mwgfaqoQ=
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
 github.com/Shopify/sarama v1.24.1 h1:svn9vfN3R1Hz21WR2Gj0VW9ehaDGkiOS+VqlIcZOkMI=
@@ -22,14 +37,21 @@ github.com/Shopify/toxiproxy v2.1.4+incompatible h1:TKdv8HiTLgE5wdJuEML90aBgNWso
 github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMxUHB2q5Ap20/P/eIdh4G0pI=
 github.com/StackExchange/wmi v0.0.0-20190523213315-cbe66965904d h1:G0m3OIz70MZUWq3EgK3CesDbo8upS2Vm9/P3FtgI+Jk=
 github.com/StackExchange/wmi v0.0.0-20190523213315-cbe66965904d/go.mod h1:3eOhrUMpNV+6aFIbp5/iudMxNCF27Vw2OZgy4xEx0Fg=
+github.com/abiosoft/ishell v2.0.0+incompatible/go.mod h1:HQR9AqF2R3P4XXpMpI0NAzgHf/aS6+zVXRj14cVk9qg=
+github.com/abiosoft/readline v0.0.0-20180607040430-155bce2042db/go.mod h1:rB3B4rKii8V21ydCbIzH5hZiCQE7f5E9SzUb/ZZx530=
 github.com/alecthomas/participle v0.2.1 h1:4AVLj1viSGa4LG5HDXKXrm5xRx19SB/rS/skPQB1Grw=
 github.com/alecthomas/participle v0.2.1/go.mod h1:SW6HZGeZgSIpcUWX3fXpfZhuaWHnmoD5KCVaqSaNTkk=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hCbHZ8TKRvWD2dDTCfh9M9ya+I9JpbB7O8o=
 github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
 github.com/armon/go-metrics v0.0.0-20190430140413-ec5e00d3c878 h1:EFSB7Zo9Eg91v7MJPVsifUysc/wPdN+NOnVe6bWbdBM=
 github.com/armon/go-metrics v0.0.0-20190430140413-ec5e00d3c878/go.mod h1:3AMJUQhVx52RsWOnlkpikZr01T/yAVN2gn0861vByNg=
 github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
+github.com/awalterschulze/gographviz v0.0.0-20181013152038-b2885df04310 h1:t+qxRrRtwNiUYA+Xh2jSXhoG2grnMCMKX4Fg6lx9X1U=
+github.com/awalterschulze/gographviz v0.0.0-20181013152038-b2885df04310/go.mod h1:GEV5wmg4YquNw7v1kkyoX9etIk8yVmXj+AkDHuuETHs=
 github.com/aws/aws-sdk-go v1.20.21 h1:22vHWL9rur+SRTYPHAXlxJMFIA9OSYsYDIAHFDhQ7Z0=
 github.com/aws/aws-sdk-go v1.20.21/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
 github.com/bcicen/jstream v0.0.0-20190220045926-16c1f8af81c2 h1:M+TYzBcNIRyzPRg66ndEqUMd7oWDmhvdQmaPC6EZNwM=
@@ -40,27 +62,36 @@ github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973 h1:xJ4a3vCFaGF/jqvzLM
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v1.0.0 h1:HWo1m869IqiPhD389kmkxeTalrjNbbJTC8LXupb+sl0=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
 github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
+github.com/bketelsen/crypt v0.0.3-0.20200106085610-5cbc8cc4026c/go.mod h1:MKsuJmJgSg28kpZDP6UIiPt0e0Oz0kqKNGyRaWEPv84=
 github.com/boltdb/bolt v1.3.1/go.mod h1:clJnj/oiGkjum5o1McbSZDSLxVThjynRyGBgiAx27Ps=
 github.com/census-instrumentation/opencensus-proto v0.2.0 h1:LzQXZOgg4CQfE6bFvXGM30YZL1WW/M337pXml+GrcZ4=
 github.com/census-instrumentation/opencensus-proto v0.2.0/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
+github.com/census-instrumentation/opencensus-proto v0.2.1 h1:glEXhBS5PSLLv4IXzLA5yPRVX4bilULVyxxbrfOtDAk=
+github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
 github.com/cespare/xxhash v1.1.0 h1:a6HrQnmkObjyL+Gs60czilIUGqrzKutQD6XZog3p+ko=
 github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
 github.com/cespare/xxhash/v2 v2.1.1 h1:6MnRN8NT7+YBpUIWxHtefFZOKTAPgGjpQSxqLNn0+qY=
 github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/cheggaaa/pb v1.0.28 h1:kWGpdAcSp3MxMU9CCHOwz/8V0kCHN4+9yQm2MzWuI98=
 github.com/cheggaaa/pb v1.0.28/go.mod h1:pQciLPpbU0oxA0h+VJYYLxO+XeDQb5pZijXscXHm81s=
+github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
+github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
 github.com/circonus-labs/circonus-gometrics v2.3.1+incompatible/go.mod h1:nmEj6Dob7S7YxXgwXpfOuvO54S+tGdZdw9fuRZt25Ag=
 github.com/circonus-labs/circonusllhist v0.1.3/go.mod h1:kMXHVDlOchFAehlya5ePtbp5jckzBHf4XRpQvBOLI+I=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
 github.com/colinmarc/hdfs/v2 v2.1.1 h1:x0hw/m+o3UE20Scso/KCkvYNc9Di39TBlCfGMkJ1/a0=
 github.com/colinmarc/hdfs/v2 v2.1.1/go.mod h1:M3x+k8UKKmxtFu++uAZ0OtDU8jR3jnaZIAc6yK4Ue0c=
 github.com/coredns/coredns v1.4.0 h1:RubBkYmkByUqZWWkjRHvNLnUHgkRVqAWgSMmRFvpE1A=
 github.com/coredns/coredns v1.4.0/go.mod h1:zASH/MVDgR6XZTbxvOnsZfffS+31vg6Ackf/wo1+AM0=
+github.com/coreos/bbolt v1.3.2/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
 github.com/coreos/bbolt v1.3.3 h1:n6AiVyVRKQFNb6mJlwESEvvLoDyiTzXX7ORAUlkeBdY=
 github.com/coreos/bbolt v1.3.3/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
-github.com/coreos/etcd v3.3.12+incompatible h1:pAWNwdf7QiT1zfaWyqCtNZQWCLByQyA3JrSQyuYAqnQ=
+github.com/coreos/etcd v3.3.13+incompatible h1:8F3hqu9fGYLBifCmRCJsicFqDx/D68Rt3q1JMazcgBQ=
-github.com/coreos/etcd v3.3.12+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
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@@ -89,10 +120,14 @@ github.com/eclipse/paho.mqtt.golang v1.2.0 h1:1F8mhG9+aO5/xpdtFkW4SxOJB67ukuDC3t
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@@ -100,10 +135,14 @@ github.com/frankban/quicktest v1.4.1 h1:Wv2VwvNn73pAdFIVUQRXYDFp31lXKbqblIXo/Q5G
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@@ -116,17 +155,30 @@ github.com/go-test/deep v1.0.2-0.20181118220953-042da051cf31/go.mod h1:wGDj63lr6
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@@ -140,15 +192,20 @@ github.com/google/go-cmp v0.3.0 h1:crn/baboCvb5fXaQ0IJ1SGTsTVrWpDsCWC8EGETZijY=
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@@ -158,8 +215,9 @@ github.com/gorilla/mux v1.7.4 h1:VuZ8uybHlWmqV03+zRzdwKL4tUnIp1MAQtp1mIFE1bc=
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@@ -167,6 +225,8 @@ github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0/go.mod h1:8NvIoxWQoOIhqOTXgf
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@@ -179,6 +239,7 @@ github.com/hashicorp/go-hclog v0.9.2 h1:CG6TE5H9/JXsFWJCfoIVpKFIkFe6ysEuHirp4DxC
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@@ -187,23 +248,31 @@ github.com/hashicorp/go-plugin v1.0.1/go.mod h1:++UyYGoz3o5w9ZzAdZxtQKrWWP+iqPBn
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@@ -219,15 +288,18 @@ github.com/jmespath/go-jmespath v0.0.0-20180206201540-c2b33e8439af h1:pmfjZENx5i
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@@ -259,6 +331,8 @@ github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
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@@ -268,12 +342,14 @@ github.com/mattn/go-ieproxy v0.0.0-20190610004146-91bb50d98149/go.mod h1:31jz6HN
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@@ -295,11 +371,15 @@ github.com/minio/sio v0.2.0 h1:NCRCFLx0r5pRbXf65LVNjxbCGZgNQvNFQkgX3XF4BoA=
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@@ -313,6 +393,9 @@ github.com/modern-go/reflect2 v1.0.1 h1:9f412s+6RmYXLWZSEzVVgPGK7C2PphHj5RJrvfx9
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@@ -342,13 +425,28 @@ github.com/ncw/directio v1.0.5 h1:JSUBhdjEvVaJvOoyPAbcW0fnd0tvRXD76wEfZ1KcQz4=
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@@ -358,6 +456,8 @@ github.com/pierrec/lz4 v2.4.0+incompatible/go.mod h1:pdkljMzZIN41W+lC3N2tnIh5sFi
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@@ -365,17 +465,29 @@ github.com/prometheus/client_golang v0.9.1/go.mod h1:7SWBe2y4D6OKWSNQJUaRYU/AaXP
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@@ -386,14 +498,17 @@ github.com/rogpeppe/fastuuid v0.0.0-20150106093220-6724a57986af/go.mod h1:XWv6So
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@@ -409,6 +524,16 @@ github.com/soheilhy/cmux v0.1.4/go.mod h1:IM3LyeVVIOuxMH7sFAkER9+bJ4dT7Ms6E4xg4k
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@@ -419,6 +544,8 @@ github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJy
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@@ -432,10 +559,6 @@ github.com/tinylib/msgp v1.1.1/go.mod h1:+d+yLhGm8mzTaHzB+wgMYrodPfmZrzkirds8fDW
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@@ -449,42 +572,63 @@ github.com/xdg/stringprep v1.0.0/go.mod h1:Jhud4/sHMO4oL310DaZAKk9ZaJ08SJfe+sJh0
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@@ -492,15 +636,19 @@ golang.org/x/net v0.0.0-20190108225652-1e06a53dbb7e/go.mod h1:mL1N/T3taQHkDXs73r
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 google.golang.org/grpc v1.14.0/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmEdcZw=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
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 google.golang.org/grpc v1.22.0 h1:J0UbZOIrCAl+fpTOf8YLs4dJo8L/owV4LYVtAXQoPkw=
 google.golang.org/grpc v1.22.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
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@@ -610,13 +802,17 @@ gopkg.in/urfave/cli.v1 v1.20.0/go.mod h1:vuBzUtMdQeixQj8LVd+/98pzhxNGQoyuPBlsXHO
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+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
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neofs/layer/gateway-neofs.go

@@ -0,0 +1,79 @@
+package layer
+
+import (
+	"context"
+	"crypto/ecdsa"
+	"errors"
+	"math"
+	"time"
+
+	minio "github.com/minio/minio/cmd"
+	"github.com/minio/minio/neofs/pool"
+	"github.com/minio/minio/pkg/auth"
+	"github.com/nspcc-dev/neofs-api-go/chain"
+	"github.com/nspcc-dev/neofs-api-go/refs"
+	"github.com/nspcc-dev/neofs-api-go/service"
+	crypto "github.com/nspcc-dev/neofs-crypto"
+)
+
+type (
+	// neofsObjects implements gateway for MinIO and S3
+	// compatible object storage server.
+	neofsObject struct {
+		minio.GatewayUnsupported // placeholder for unimplemented functions
+
+		cli   pool.Client
+		key   *ecdsa.PrivateKey
+		owner refs.OwnerID
+		token *service.Token
+
+		// Concurrency must be resolved by creating one lock per object, but
+		// it may be unnecessary in neofs, because objects are immutable. So
+		// there are no any mutexes and locks right now but it might be
+		// useful during parallel execution from one client (different clients
+		// have different `neofsObject` instances).
+
+		// todo: add fast expired cache to store list of containers or
+		//       even short objects during sequential reading
+	}
+)
+
+// NewGatewayLayer creates instance of neofsObject. It checks credentials
+// and establishes gRPC connection with node.
+func NewLayer(cli pool.Client, cred auth.Credentials) (minio.ObjectLayer, error) {
+	// check if wif is correct
+	key, err := crypto.WIFDecode(cred.SecretKey)
+	if err != nil {
+		return nil, errors.New("can't decode secret key, it must be WIF")
+	}
+	// check if wif corresponds wallet address
+	if cred.AccessKey != chain.KeysToAddress(&key.PublicKey) {
+		return nil, errors.New("wif and wallet are not corresponded")
+	}
+	// format public key into owner
+	owner, err := refs.NewOwnerID(&key.PublicKey)
+	if err != nil {
+		return nil, errors.New("can't create owner id from key")
+	}
+
+	// setup gRPC connection
+	// todo: think about getting timeout parameters from cli args
+	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
+	defer cancel()
+
+	token, err := generateToken(ctx, tokenParams{
+		cli:   cli,
+		key:   key,
+		until: math.MaxInt64,
+	})
+	if err != nil {
+		return nil, errors.New("can't establish neofs session with remote host")
+	}
+
+	return &neofsObject{
+		cli:   cli,
+		key:   key,
+		owner: owner,
+		token: token,
+	}, nil
+}

neofs/layer/neofs-container.go

@@ -0,0 +1,38 @@
+package layer
+
+import (
+	"context"
+	"time"
+
+	"github.com/nspcc-dev/neofs-api-go/container"
+	"github.com/nspcc-dev/neofs-api-go/refs"
+	"github.com/nspcc-dev/neofs-api-go/service"
+)
+
+func (n *neofsObject) containerList(ctx context.Context) ([]refs.CID, error) {
+	req := new(container.ListRequest)
+	req.OwnerID = n.owner
+	req.SetTTL(service.SingleForwardingTTL)
+	req.SetVersion(APIVersion)
+
+	err := service.SignDataWithSessionToken(n.key, req)
+	if err != nil {
+		return nil, err
+	}
+
+	conn, err := n.cli.GetConnection(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	// todo: think about timeout
+	ctx, cancel := context.WithTimeout(ctx, 30*time.Second)
+	defer cancel()
+
+	res, err := container.NewServiceClient(conn).List(ctx, req)
+	if err != nil {
+		return nil, err
+	}
+
+	return res.CID, nil
+}

neofs/layer/neofs-object.go

@@ -0,0 +1,534 @@
+package layer
+
+import (
+	"bytes"
+	"context"
+	"errors"
+	"io"
+	"time"
+
+	"github.com/nspcc-dev/neofs-api-go/object"
+	"github.com/nspcc-dev/neofs-api-go/query"
+	"github.com/nspcc-dev/neofs-api-go/refs"
+	"github.com/nspcc-dev/neofs-api-go/service"
+	"github.com/nspcc-dev/neofs-api-go/storagegroup"
+)
+
+const (
+	dataChunkSize = 3 * object.UnitsMB
+	objectVersion = 1
+)
+
+type (
+	putParams struct {
+		addr        refs.Address
+		name        string
+		size        int64
+		r           io.Reader
+		userHeaders map[string]string
+	}
+	sgParams struct {
+		addr    refs.Address
+		objects []refs.ObjectID
+	}
+	delParams struct {
+		addr refs.Address
+	}
+	getParams struct {
+		addr   refs.Address
+		start  int64
+		length int64
+		writer io.Writer
+	}
+)
+
+// objectSearchContainer returns all available objects in the container.
+func (n *neofsObject) objectSearchContainer(ctx context.Context, cid refs.CID) ([]refs.ObjectID, error) {
+	var q query.Query
+	q.Filters = append(q.Filters, query.Filter{
+		Type: query.Filter_Exact,
+		Name: object.KeyRootObject,
+	})
+
+	queryBinary, err := q.Marshal()
+	if err != nil {
+		return nil, err
+	}
+
+	token, err := prepareToken(n.token, queryParams{
+		key:  n.key,
+		addr: refs.Address{CID: cid},
+		verb: service.Token_Info_Search,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	req := new(object.SearchRequest)
+	req.Query = queryBinary
+	req.QueryVersion = 1
+	req.ContainerID = cid
+	req.SetTTL(service.SingleForwardingTTL)
+	req.SetVersion(APIVersion)
+	req.SetToken(token)
+
+	err = service.SignDataWithSessionToken(n.key, req)
+	if err != nil {
+		return nil, err
+	}
+
+	conn, err := n.cli.GetConnection(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	// todo: think about timeout
+	ctx, cancel := context.WithTimeout(ctx, 30*time.Second)
+	defer cancel()
+
+	searchClient, err := object.NewServiceClient(conn).Search(ctx, req)
+	if err != nil {
+		return nil, err
+	}
+
+	var (
+		response []refs.Address
+		result   []refs.ObjectID
+	)
+
+	for {
+		resp, err := searchClient.Recv()
+		if err != nil {
+			if err == io.EOF {
+				break
+			}
+
+			return nil, errors.New("search command received error")
+		}
+
+		response = append(response, resp.Addresses...)
+	}
+
+	for i := range response {
+		result = append(result, response[i].ObjectID)
+	}
+
+	return result, nil
+}
+
+// objectFindID returns object id (uuid) based on it's nice name in s3. If
+// nice name is uuid compatible, then function returns it.
+func (n *neofsObject) objectFindID(ctx context.Context, cid refs.CID, name string, put bool) (refs.ObjectID, error) {
+	var (
+		id refs.ObjectID
+		q  query.Query
+	)
+
+	q.Filters = append(q.Filters, query.Filter{
+		Type: query.Filter_Exact,
+		Name: object.KeyRootObject,
+	})
+	q.Filters = append(q.Filters, query.Filter{
+		Type:  query.Filter_Exact,
+		Name:  AWS3NameHeader,
+		Value: name,
+	})
+
+	queryBinary, err := q.Marshal()
+	if err != nil {
+		return id, err
+	}
+
+	token, err := prepareToken(n.token, queryParams{
+		key:  n.key,
+		addr: refs.Address{CID: cid},
+		verb: service.Token_Info_Search,
+	})
+	if err != nil {
+		return id, err
+	}
+
+	req := new(object.SearchRequest)
+	req.Query = queryBinary
+	req.QueryVersion = 1
+	req.ContainerID = cid
+	req.SetTTL(service.SingleForwardingTTL)
+	req.SetVersion(APIVersion)
+	req.SetToken(token)
+
+	err = service.SignDataWithSessionToken(n.key, req)
+	if err != nil {
+		return id, err
+	}
+
+	conn, err := n.cli.GetConnection(ctx)
+	if err != nil {
+		return id, err
+	}
+
+	// todo: think about timeout
+	ctx, cancel := context.WithTimeout(ctx, 30*time.Second)
+	defer cancel()
+
+	searchClient, err := object.NewServiceClient(conn).Search(ctx, req)
+	if err != nil {
+		return id, err
+	}
+
+	var response []refs.Address
+
+	for {
+		resp, err := searchClient.Recv()
+		if err != nil {
+			if err == io.EOF {
+				break
+			}
+
+			return id, errors.New("search command received error")
+		}
+
+		response = append(response, resp.Addresses...)
+	}
+
+	switch ln := len(response); {
+	case ln > 1:
+		return id, errors.New("several objects with the same name found")
+	case ln == 1:
+		return response[0].ObjectID, nil
+	default:
+		// Minio lists all objects with and without nice names. All objects
+		// without nice name still have "name" in terms of minio - uuid encoded
+		// into string. There is a tricky case when user upload object
+		// with nice name that is encoded uuid.
+		// There is an optimisation to parse name and return uuid if it name is uuid
+		// compatible. It _should not_ work in case of put operation, because object
+		// with uuid compatible nice name may not exist. Therefore this optimization
+		// breaks object put logic and must be turned off.
+		if !put {
+			err := id.Parse(name)
+			if err == nil {
+				return id, nil
+			}
+		}
+		return id, errors.New("object not found")
+	}
+}
+
+// objectHead returns all object's headers.
+func (n *neofsObject) objectHead(ctx context.Context, addr refs.Address) (*object.Object, error) {
+	token, err := prepareToken(n.token, queryParams{
+		key:  n.key,
+		addr: addr,
+		verb: service.Token_Info_Head,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	req := new(object.HeadRequest)
+	req.Address = addr
+	req.FullHeaders = true
+	req.SetTTL(service.SingleForwardingTTL)
+	req.SetVersion(APIVersion)
+	req.SetToken(token)
+
+	err = service.SignDataWithSessionToken(n.key, req)
+	if err != nil {
+		return nil, err
+	}
+
+	conn, err := n.cli.GetConnection(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	// todo: think about timeout
+	ctx, cancel := context.WithTimeout(ctx, 30*time.Second)
+	defer cancel()
+
+	res, err := object.NewServiceClient(conn).Head(ctx, req)
+	if err != nil {
+		return nil, err
+	}
+
+	return res.Object, nil
+}
+
+// objectGet and write it into provided io.Reader.
+func (n *neofsObject) objectGet(ctx context.Context, p getParams) (*object.Object, error) {
+	token, err := prepareToken(n.token, queryParams{
+		key:  n.key,
+		addr: p.addr,
+		verb: service.Token_Info_Get,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	// todo: replace object.Get() call by object.GetRange() for
+	//       true sequential reading support; it will be possible when
+	//       object.GetRange() response message become gRPC stream.
+	req := new(object.GetRequest)
+	req.Address = p.addr
+	req.SetTTL(service.SingleForwardingTTL)
+	req.SetVersion(APIVersion)
+	req.SetToken(token)
+
+	err = service.SignDataWithSessionToken(n.key, req)
+	if err != nil {
+		return nil, err
+	}
+
+	conn, err := n.cli.GetConnection(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	// todo: think about timeout
+	ctx, cancel := context.WithTimeout(ctx, 30*time.Second)
+	defer cancel()
+
+	getClient, err := object.NewServiceClient(conn).Get(ctx, req)
+	if err != nil {
+		return nil, err
+	}
+
+	var (
+		headerReceived bool
+
+		buf       = new(bytes.Buffer)
+		objHeader = new(object.Object)
+	)
+
+	for {
+		resp, err := getClient.Recv()
+		if err != nil {
+			if err == io.EOF {
+				break
+			}
+
+			return nil, err
+		}
+
+		if !headerReceived {
+			objHeader = resp.GetObject()
+
+			_, hdr := objHeader.LastHeader(object.HeaderType(object.TombstoneHdr))
+			if hdr != nil {
+				return nil, errors.New("object already removed")
+			}
+
+			_, err = buf.Write(objHeader.Payload)
+			if err != nil && err != io.EOF {
+				return nil, err
+			}
+
+			headerReceived = true
+
+			continue
+		}
+
+		chunk := resp.GetChunk()
+
+		_, err = buf.Write(chunk)
+		if err != nil && err != io.EOF {
+			return nil, err
+		}
+	}
+
+	buf = bytes.NewBuffer(buf.Bytes()[p.start : p.start+p.length])
+	_, err = io.Copy(p.writer, buf)
+
+	return objHeader, err
+}
+
+// objectPut into neofs, took payload from io.Reader.
+func (n *neofsObject) objectPut(ctx context.Context, p putParams) (*object.Object, error) {
+	token, err := prepareToken(n.token, queryParams{
+		key:  n.key,
+		addr: p.addr,
+		verb: service.Token_Info_Put,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	conn, err := n.cli.GetConnection(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	client := object.NewServiceClient(conn)
+	// todo: think about timeout
+	putClient, err := client.Put(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	if p.userHeaders == nil {
+		p.userHeaders = make(map[string]string)
+	}
+
+	p.userHeaders[AWS3NameHeader] = p.name
+
+	readBuffer := make([]byte, dataChunkSize)
+	obj := &object.Object{
+		SystemHeader: object.SystemHeader{
+			Version:       objectVersion,
+			ID:            p.addr.ObjectID,
+			OwnerID:       n.owner,
+			CID:           p.addr.CID,
+			PayloadLength: uint64(p.size),
+		},
+		Headers: parseUserHeaders(p.userHeaders),
+	}
+
+	req := object.MakePutRequestHeader(obj)
+	req.SetTTL(service.SingleForwardingTTL)
+	req.SetVersion(APIVersion)
+	req.SetToken(token)
+
+	err = service.SignDataWithSessionToken(n.key, req)
+	if err != nil {
+		return nil, err
+	}
+
+	err = putClient.Send(req)
+	if err != nil {
+		return nil, err
+	}
+
+	read, err := p.r.Read(readBuffer)
+	for read > 0 {
+		if err != nil && err != io.EOF {
+			return nil, err
+		}
+
+		if read > 0 {
+			req := object.MakePutRequestChunk(readBuffer[:read])
+			req.SetTTL(service.SingleForwardingTTL)
+			req.SetVersion(APIVersion)
+
+			err = service.SignDataWithSessionToken(n.key, req)
+			if err != nil {
+				return nil, err
+			}
+
+			err = putClient.Send(req)
+			if err != nil && err != io.EOF {
+				return nil, err
+			}
+		}
+
+		read, err = p.r.Read(readBuffer)
+	}
+
+	_, err = putClient.CloseAndRecv()
+	if err != nil {
+		return nil, err
+	}
+
+	// maybe make a head?
+	return obj, nil
+}
+
+// storageGroupPut prepares storage group object and put it into neofs.
+func (n *neofsObject) storageGroupPut(ctx context.Context, p sgParams) (*object.Object, error) {
+	token, err := prepareToken(n.token, queryParams{
+		key:  n.key,
+		addr: p.addr,
+		verb: service.Token_Info_Put,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	conn, err := n.cli.GetConnection(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	client := object.NewServiceClient(conn)
+	// todo: think about timeout
+	putClient, err := client.Put(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	sg := &object.Object{
+		SystemHeader: object.SystemHeader{
+			Version: objectVersion,
+			ID:      p.addr.ObjectID,
+			OwnerID: n.owner,
+			CID:     p.addr.CID,
+		},
+		Headers: make([]object.Header, 0, len(p.objects)),
+	}
+
+	for i := range p.objects {
+		sg.AddHeader(&object.Header{Value: &object.Header_Link{
+			Link: &object.Link{Type: object.Link_StorageGroup, ID: p.objects[i]},
+		}})
+	}
+
+	sg.SetStorageGroup(new(storagegroup.StorageGroup))
+
+	req := object.MakePutRequestHeader(sg)
+	req.SetTTL(service.SingleForwardingTTL)
+	req.SetVersion(APIVersion)
+	req.SetToken(token)
+
+	err = service.SignDataWithSessionToken(n.key, req)
+	if err != nil {
+		return nil, err
+	}
+
+	err = putClient.Send(req)
+	if err != nil {
+		return nil, err
+	}
+
+	_, err = putClient.CloseAndRecv()
+	if err != nil {
+		return nil, err
+	}
+
+	return sg, nil
+}
+
+// objectDelete puts tombstone object into neofs.
+func (n *neofsObject) objectDelete(ctx context.Context, p delParams) error {
+	token, err := prepareToken(n.token, queryParams{
+		key:  n.key,
+		addr: p.addr,
+		verb: service.Token_Info_Delete,
+	})
+	if err != nil {
+		return err
+	}
+
+	req := new(object.DeleteRequest)
+	req.Address = p.addr
+	req.OwnerID = n.owner
+	req.SetTTL(service.SingleForwardingTTL)
+	req.SetVersion(APIVersion)
+	req.SetToken(token)
+
+	err = service.SignDataWithSessionToken(n.key, req)
+	if err != nil {
+		return err
+	}
+
+	conn, err := n.cli.GetConnection(ctx)
+	if err != nil {
+		return err
+	}
+
+	// todo: think about timeout
+	ctx, cancel := context.WithTimeout(ctx, 30*time.Second)
+	defer cancel()
+
+	_, err = object.NewServiceClient(conn).Delete(ctx, req)
+
+	return err
+}

neofs/layer/neofs-status.go

@@ -0,0 +1,34 @@
+package layer
+
+import (
+	"context"
+	"time"
+
+	"github.com/nspcc-dev/neofs-api-go/service"
+	"github.com/nspcc-dev/neofs-api-go/state"
+)
+
+func (n *neofsObject) statusHealth(ctx context.Context) bool {
+	req := new(state.HealthRequest)
+	req.SetTTL(service.NonForwardingTTL)
+	req.SetVersion(APIVersion)
+
+	err := service.SignDataWithSessionToken(n.key, req)
+	if err != nil {
+		return false
+	}
+
+	conn, err := n.cli.GetConnection(ctx)
+	if err != nil {
+		return false
+	}
+
+	// 1 second timeout is the same as in gateway-common.go
+	// see: cmd/gateway-common.go:295
+	ctx, cancel := context.WithTimeout(ctx, 1*time.Second)
+	defer cancel()
+
+	res, err := state.NewStatusClient(conn).HealthCheck(ctx, req)
+
+	return err != nil && res != nil && res.Healthy
+}

neofs/layer/object-layer.go

@@ -0,0 +1,445 @@
+package layer
+
+import (
+	"context"
+	"errors"
+	"io"
+	"net/http"
+	"strings"
+
+	minio "github.com/minio/minio/cmd"
+	"github.com/minio/minio/pkg/hash"
+	"github.com/nspcc-dev/neofs-api-go/object"
+	"github.com/nspcc-dev/neofs-api-go/refs"
+	"google.golang.org/grpc/connectivity"
+)
+
+const (
+	// AWS3NameHeader key in the object neofs.
+	AWS3NameHeader = "filename"
+
+	// SlashSeparator to find dirs in object path.
+	SlashSeparator = "/"
+)
+
+// Shutdown called when minio remote client closed.
+func (n *neofsObject) Shutdown(context.Context) error {
+	return nil
+}
+
+// StorageInfo is not relevant in NeoFS the same way as in B2.
+func (n *neofsObject) StorageInfo(ctx context.Context, local bool) (minio.StorageInfo, []error) {
+	var si minio.StorageInfo
+
+	si.Backend.Type = minio.BackendGateway
+	si.Backend.GatewayOnline = n.statusHealth(ctx)
+
+	return si, nil
+}
+
+// MakeBucketWithLocation is not supported in neofs gateway.
+func (n *neofsObject) MakeBucketWithLocation(ctx context.Context, bucket, location string, lockEnabled bool) error {
+	// ATTENTION
+	// We do not support new bucket creation, because NeoFS does not support
+	// nice names for containers (buckets in s3). Nice name support might me
+	// implemented with external NNS which can be smart-contract in NEO
+	// blockchain.
+	return errors.New("neofs gateway doesn't support bucket creation")
+}
+
+// GetBucketInfo returns bucket name.
+func (n *neofsObject) GetBucketInfo(ctx context.Context, bucket string) (minio.BucketInfo, error) {
+	var result = minio.BucketInfo{Name: bucket}
+
+	return result, nil
+}
+
+// ListBuckets returns all user containers. Name of the bucket is a container
+// id. Timestamp is omitted since it is not saved in neofs container.
+func (n *neofsObject) ListBuckets(ctx context.Context) ([]minio.BucketInfo, error) {
+	containerIDs, err := n.containerList(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	buckets := make([]minio.BucketInfo, 0, len(containerIDs))
+
+	for i := range containerIDs {
+		buckets = append(buckets, minio.BucketInfo{
+			Name: containerIDs[i].String(),
+		})
+	}
+
+	return buckets, nil
+}
+
+// DeleteBucket is not supported in neofs gateway
+func (n *neofsObject) DeleteBucket(ctx context.Context, bucket string, force bool) error {
+	// ATTENTION
+	// We do not support bucket removal, because NeoFS does not support
+	// bucket creation, therefore it is not consistent. With NNS it may
+	// be implemented later, see `MakeBucketWithLocation()` function.
+	return errors.New("neofs gateway doesn't support bucket removal")
+}
+
+// ListObjects returns objects from the container. It ignores tombstones and
+// storage groups.
+func (n *neofsObject) ListObjects(ctx context.Context, bucket, prefix, marker, delimiter string, maxKeys int) (minio.ListObjectsInfo, error) {
+	// todo: make pagination when search response will be gRPC stream,
+	//       pagination must be implemented with cache, because search results
+	//       may be different between search calls
+	var (
+		result    minio.ListObjectsInfo
+		uniqNames = make(map[string]struct{})
+	)
+
+	containerID, err := refs.CIDFromString(bucket)
+	if err != nil {
+		return result, err
+	}
+
+	objectIDs, err := n.objectSearchContainer(ctx, containerID)
+	if err != nil {
+		return result, err
+	}
+
+	ln := len(objectIDs)
+	// todo: check what happens if there is more than maxKeys objects
+	if ln > maxKeys {
+		result.IsTruncated = true
+		ln = maxKeys
+	}
+
+	result.Objects = make([]minio.ObjectInfo, 0, ln)
+
+	for i := 0; i < ln; i++ {
+		addr := refs.Address{ObjectID: objectIDs[i], CID: containerID}
+
+		meta, err := n.objectHead(ctx, addr)
+		if err != nil {
+			// todo: log there
+			continue
+		}
+
+		// ignore tombstone objects
+		_, hdr := meta.LastHeader(object.HeaderType(object.TombstoneHdr))
+		if hdr != nil {
+			continue
+		}
+
+		// ignore storage group objects
+		_, hdr = meta.LastHeader(object.HeaderType(object.StorageGroupHdr))
+		if hdr != nil {
+			continue
+		}
+
+		// dirs don't exist in neofs, gateway stores full path to the file
+		// in object header, e.g. `filename`:`/this/is/path/file.txt`
+
+		// prefix argument contains full dir path from the root, e.g. `/this/is/`
+
+		// to emulate dirs we take dirs in path, compare it with prefix
+		// and look for entities after prefix. If entity does not have any
+		// sub-entities, then it is a file, else directory.
+
+		_, filedir := nameFromObject(meta)
+		if strings.HasPrefix(filedir, prefix) {
+			var (
+				oi   minio.ObjectInfo
+				tail = strings.TrimLeft(filedir, prefix)
+				ind  = strings.Index(tail, SlashSeparator)
+			)
+
+			if ind < 0 { // if there are not sub-entities in tail - file
+				oi = objectInfoFromMeta(meta)
+			} else { // if there are sub-entities in tail - dir
+				oi = minio.ObjectInfo{
+					Bucket: meta.SystemHeader.CID.String(),
+					Name:   tail[:ind+1], // dir MUST have slash symbol in the end
+					IsDir:  true,
+				}
+			}
+
+			// use only unique dir names
+			if _, ok := uniqNames[oi.Name]; !ok {
+				uniqNames[oi.Name] = struct{}{}
+
+				result.Objects = append(result.Objects, oi)
+			}
+		}
+	}
+
+	return result, nil
+}
+
+// ListObjectsV2 returns objects from the container. It ignores tombstones and
+// storage groups.
+func (n *neofsObject) ListObjectsV2(ctx context.Context, bucket, prefix, continuationToken, delimiter string, maxKeys int, fetchOwner bool, startAfter string) (minio.ListObjectsV2Info, error) {
+	// todo: make pagination when search response will be gRPC stream
+	//       pagination must be implemented via cache, because search results
+	//       may be different between search queries. Also use startAfter
+	//       param in the answer
+	//
+	var result minio.ListObjectsV2Info
+
+	list, err := n.ListObjects(ctx, bucket, prefix, continuationToken, delimiter, maxKeys)
+	if err != nil {
+		return result, err
+	}
+
+	result.IsTruncated = list.IsTruncated
+	result.Prefixes = list.Prefixes
+	result.ContinuationToken = continuationToken
+	result.NextContinuationToken = list.NextMarker
+	result.Objects = list.Objects
+
+	return result, nil
+}
+
+// GetObjectNInfo performs two operations within one call.
+func (n *neofsObject) GetObjectNInfo(ctx context.Context, bucket, object string, rs *minio.HTTPRangeSpec, h http.Header, lockType minio.LockType, opts minio.ObjectOptions) (*minio.GetObjectReader, error) {
+	oi, err := n.GetObjectInfo(ctx, bucket, object, opts)
+	if err != nil {
+		return nil, err
+	}
+
+	var startOffset, length int64
+
+	startOffset, length, err = rs.GetOffsetLength(oi.Size)
+	if err != nil {
+		return nil, err
+	}
+
+	pr, pw := io.Pipe()
+
+	go func() {
+		err = n.GetObject(ctx, bucket, object, startOffset, length, pw, oi.ETag, opts)
+		_ = pw.CloseWithError(err)
+	}()
+
+	pipeCloser := func() { _ = pr.Close() }
+
+	return minio.NewGetObjectReaderFromReader(pr, oi, opts.CheckCopyPrecondFn, pipeCloser)
+}
+
+// GetObject from storage.
+func (n *neofsObject) GetObject(ctx context.Context, bucket, object string, startOffset int64, length int64, writer io.Writer, etag string, opts minio.ObjectOptions) error {
+	var (
+		notFoundError = minio.ObjectNotFound{
+			Bucket: bucket,
+			Object: object,
+		}
+	)
+
+	containerID, err := refs.CIDFromString(bucket)
+	if err != nil {
+		return err
+	}
+
+	objectID, err := n.objectFindID(ctx, containerID, object, false)
+	if err != nil {
+		return notFoundError
+	}
+
+	addr := refs.Address{
+		ObjectID: objectID,
+		CID:      containerID,
+	}
+	_, err = n.objectGet(ctx, getParams{
+		addr:   addr,
+		start:  startOffset,
+		length: length,
+		writer: writer,
+	})
+
+	return err
+}
+
+// GetObjectInfo returns meta information about the object.
+func (n *neofsObject) GetObjectInfo(ctx context.Context, bucket, object string, opts minio.ObjectOptions) (minio.ObjectInfo, error) {
+	var (
+		err           error
+		result        minio.ObjectInfo
+		notFoundError = minio.ObjectNotFound{
+			Bucket: bucket,
+			Object: object,
+		}
+	)
+
+	containerID, err := refs.CIDFromString(bucket)
+	if err != nil {
+		return result, err
+	}
+
+	objectID, err := n.objectFindID(ctx, containerID, object, false)
+	if err != nil {
+		return result, notFoundError
+	}
+
+	addr := refs.Address{
+		ObjectID: objectID,
+		CID:      containerID,
+	}
+
+	meta, err := n.objectHead(ctx, addr)
+	if err != nil {
+		return result, err
+	}
+
+	return objectInfoFromMeta(meta), nil
+}
+
+// PutObject into storage.
+func (n *neofsObject) PutObject(ctx context.Context, bucket, object string, data *minio.PutObjReader, opts minio.ObjectOptions) (minio.ObjectInfo, error) {
+	var (
+		result            minio.ObjectInfo
+		objectExistsError = minio.ObjectAlreadyExists{
+			Bucket: bucket,
+			Object: object,
+		}
+	)
+
+	containerID, err := refs.CIDFromString(bucket)
+	if err != nil {
+		return result, err
+	}
+
+	// check if object with such name already exists in the bucket
+	_, err = n.objectFindID(ctx, containerID, object, true)
+	if err == nil {
+		return result, objectExistsError
+	}
+
+	objectID, err := refs.NewObjectID()
+	if err != nil {
+		return result, err
+	}
+
+	storageGroupID, err := refs.NewObjectID()
+	if err != nil {
+		return result, err
+	}
+
+	addr := refs.Address{
+		ObjectID: objectID,
+		CID:      containerID,
+	}
+
+	meta, err := n.objectPut(ctx, putParams{
+		addr:        addr,
+		name:        object,
+		size:        data.Size(),
+		r:           data.Reader,
+		userHeaders: opts.UserDefined,
+	})
+	if err != nil {
+		return result, err
+	}
+
+	oi := objectInfoFromMeta(meta)
+
+	// for every object create storage group, otherwise object will be deleted
+	addr.ObjectID = storageGroupID
+
+	_, err = n.storageGroupPut(ctx, sgParams{
+		addr:    addr,
+		objects: []refs.ObjectID{objectID},
+	})
+	if err != nil {
+		return result, err
+	}
+
+	return oi, nil
+}
+
+// CopyObject from one bucket into another bucket.
+func (n *neofsObject) CopyObject(ctx context.Context, srcBucket, srcObject, destBucket, destObject string, srcInfo minio.ObjectInfo, srcOpts, dstOpts minio.ObjectOptions) (minio.ObjectInfo, error) {
+	objInfo, err := n.GetObjectInfo(ctx, srcBucket, srcObject, srcOpts)
+	if err != nil {
+		return objInfo, err
+	}
+
+	pr, pw := io.Pipe()
+
+	go func() {
+		err := n.GetObject(ctx, srcBucket, srcObject, 0, 0, pw, "", srcOpts)
+		_ = pw.CloseWithError(err)
+	}()
+
+	data := new(minio.PutObjReader)
+
+	// ignore hex
+	data.Reader, err = hash.NewReader(pr, objInfo.Size, "", "", objInfo.Size, false)
+	if err != nil {
+		return objInfo, err
+	}
+
+	_, err = n.PutObject(ctx, destBucket, destObject, data, dstOpts)
+
+	return objInfo, err
+}
+
+// DeleteObject from the storage.
+func (n *neofsObject) DeleteObject(ctx context.Context, bucket, object string) error {
+	containerID, err := refs.CIDFromString(bucket)
+	if err != nil {
+		return err
+	}
+
+	objectID, err := n.objectFindID(ctx, containerID, object, false)
+	if err != nil {
+		return err
+	}
+
+	addr := refs.Address{
+		ObjectID: objectID,
+		CID:      containerID,
+	}
+
+	// maybe we need to wait some time after objectDelete() to propagate
+	// tombstone before return from function, e.g. validate delete by
+	// performing head operation
+	return n.objectDelete(ctx, delParams{
+		addr: addr,
+	})
+}
+
+// DeleteObjects from the storage.
+func (n *neofsObject) DeleteObjects(ctx context.Context, bucket string, objects []string) ([]error, error) {
+	var errs = make([]error, 0, len(objects))
+
+	for i := range objects {
+		errs = append(errs, n.DeleteObject(ctx, bucket, objects[i]))
+	}
+
+	return errs, nil
+}
+
+// IsNotificationSupported - no
+func (n *neofsObject) IsNotificationSupported() bool {
+	return false
+}
+
+// IsListenBucketSupported - no
+func (n *neofsObject) IsListenBucketSupported() bool {
+	return false
+}
+
+// IsEncryptionSupported - no
+func (n *neofsObject) IsEncryptionSupported() bool {
+	return false
+}
+
+// IsCompressionSupported - no
+func (n *neofsObject) IsCompressionSupported() bool {
+	return false
+}
+
+// IsReady returns whether the layer is ready to take requests.
+func (n *neofsObject) IsReady(ctx context.Context) bool {
+	if conn, err := n.cli.GetConnection(ctx); err == nil {
+		return conn.GetState() == connectivity.Ready
+	}
+
+	return false
+}

neofs/layer/util.go

@@ -0,0 +1,147 @@
+package layer
+
+import (
+	"context"
+	"crypto/ecdsa"
+	"strings"
+	"time"
+
+	"github.com/gogo/protobuf/proto"
+	minio "github.com/minio/minio/cmd"
+	"github.com/minio/minio/neofs/pool"
+	"github.com/nspcc-dev/neofs-api-go/object"
+	"github.com/nspcc-dev/neofs-api-go/refs"
+	"github.com/nspcc-dev/neofs-api-go/service"
+	"github.com/nspcc-dev/neofs-api-go/session"
+	crypto "github.com/nspcc-dev/neofs-crypto"
+)
+
+type (
+	tokenParams struct {
+		cli   pool.Client
+		key   *ecdsa.PrivateKey
+		until uint64
+	}
+
+	queryParams struct {
+		key  *ecdsa.PrivateKey
+		addr refs.Address
+		verb service.Token_Info_Verb
+	}
+)
+
+// APIVersion of the neofs
+const APIVersion = 1
+
+func userHeaders(h []object.Header) map[string]string {
+	result := make(map[string]string, len(h))
+
+	for i := range h {
+		switch v := h[i].Value.(type) {
+		case *object.Header_UserHeader:
+			result[v.UserHeader.Key] = v.UserHeader.Value
+		default:
+			continue
+		}
+	}
+
+	return result
+}
+
+func objectInfoFromMeta(meta *object.Object) minio.ObjectInfo {
+	aws3name := meta.SystemHeader.ID.String()
+
+	userHeaders := userHeaders(meta.Headers)
+	if name, ok := userHeaders[AWS3NameHeader]; ok {
+		aws3name = name
+		delete(userHeaders, name)
+	}
+
+	oi := minio.ObjectInfo{
+		Bucket:      meta.SystemHeader.CID.String(),
+		Name:        aws3name,
+		ModTime:     time.Unix(meta.SystemHeader.CreatedAt.UnixTime, 0),
+		Size:        int64(meta.SystemHeader.PayloadLength),
+		ETag:        "", // ?
+		ContentType: "", // ?
+		UserDefined: userHeaders,
+		UserTags:    "", // ignore it
+	}
+
+	return oi
+}
+
+func generateToken(ctx context.Context, p tokenParams) (*service.Token, error) {
+	owner, err := refs.NewOwnerID(&p.key.PublicKey)
+	if err != nil {
+		return nil, err
+	}
+
+	token := new(service.Token)
+	token.SetOwnerID(owner)
+	token.SetExpirationEpoch(p.until)
+	token.SetOwnerKey(crypto.MarshalPublicKey(&p.key.PublicKey))
+
+	conn, err := p.cli.GetConnection(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	creator, err := session.NewGRPCCreator(conn, p.key)
+	if err != nil {
+		return nil, err
+	}
+
+	res, err := creator.Create(ctx, token)
+	if err != nil {
+		return nil, err
+	}
+
+	token.SetID(res.GetID())
+	token.SetSessionKey(res.GetSessionKey())
+
+	return token, nil
+}
+
+func prepareToken(t *service.Token, p queryParams) (*service.Token, error) {
+	token := proto.Clone(t).(*service.Token)
+	token.SetAddress(p.addr)
+	token.SetVerb(p.verb)
+
+	err := service.AddSignatureWithKey(p.key, service.NewSignedSessionToken(token))
+	if err != nil {
+		return nil, err
+	}
+
+	return token, nil
+}
+
+func parseUserHeaders(h map[string]string) []object.Header {
+	headers := make([]object.Header, 0, len(h))
+
+	for k, v := range h {
+		uh := &object.UserHeader{Key: k, Value: v}
+		headers = append(headers, object.Header{
+			Value: &object.Header_UserHeader{UserHeader: uh},
+		})
+	}
+
+	return headers
+}
+
+func nameFromObject(o *object.Object) (string, string) {
+	var (
+		name string
+		uh   = userHeaders(o.Headers)
+	)
+
+	if _, ok := uh[AWS3NameHeader]; !ok {
+		name = o.SystemHeader.ID.String()
+	} else {
+		name = uh[AWS3NameHeader]
+	}
+
+	ind := strings.LastIndex(name, SlashSeparator)
+
+	return name[ind+1:], name[:ind+1]
+}

neofs/layer/util_test.go

@@ -0,0 +1,91 @@
+package layer
+
+import (
+	"crypto/ecdsa"
+	"math"
+	"testing"
+
+	"github.com/nspcc-dev/neofs-api-go/refs"
+	"github.com/nspcc-dev/neofs-api-go/service"
+	"github.com/nspcc-dev/neofs-api-go/session"
+	crypto "github.com/nspcc-dev/neofs-crypto"
+	"github.com/nspcc-dev/neofs-crypto/test"
+	"github.com/stretchr/testify/require"
+)
+
+type args struct {
+	t *service.Token
+	p queryParams
+}
+
+func newTestToken(t *testing.T, key *ecdsa.PrivateKey, until uint64) *service.Token {
+	owner, err := refs.NewOwnerID(&key.PublicKey)
+	require.NoError(t, err)
+
+	token := new(service.Token)
+	token.SetOwnerID(owner)
+	token.SetExpirationEpoch(until)
+	token.SetOwnerKey(crypto.MarshalPublicKey(&key.PublicKey))
+
+	// generate token ID
+	tokenID, err := refs.NewUUID()
+	require.NoError(t, err)
+
+	pToken, err := session.NewPrivateToken(until)
+	require.NoError(t, err)
+
+	pkBytes, err := session.PublicSessionToken(pToken)
+	require.NoError(t, err)
+
+	token.SetID(tokenID)
+	token.SetSessionKey(pkBytes)
+
+	return token
+}
+
+func newTestArgs(t *testing.T, key *ecdsa.PrivateKey) args {
+	token := newTestToken(t, key, math.MaxUint64)
+
+	addr := refs.Address{}
+
+	return args{
+		t: token,
+		p: queryParams{key: key, addr: addr, verb: service.Token_Info_Put},
+	}
+}
+
+func Test_prepareToken(t *testing.T) {
+
+	key1 := test.DecodeKey(1)
+	key2 := test.DecodeKey(2)
+
+	tests := []struct {
+		name    string
+		args    args
+		want    *service.Token
+		wantErr bool
+	}{
+		{
+			name:    "should not fail, key1",
+			args:    newTestArgs(t, key1),
+			want:    newTestToken(t, key1, math.MaxUint64),
+			wantErr: false,
+		},
+		{
+			name:    "should not fail, key 2",
+			args:    newTestArgs(t, key2),
+			want:    newTestToken(t, key2, math.MaxUint64),
+			wantErr: false,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := prepareToken(tt.args.t, tt.args.p)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("prepareToken() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			require.Equal(t, tt.want, got)
+		})
+	}
+}

neofs/pool/pool.go

@@ -0,0 +1,369 @@
+package pool
+
+import (
+	"context"
+	"crypto/ecdsa"
+	crand "crypto/rand"
+	"encoding/binary"
+	"math/rand"
+	"sort"
+	"strconv"
+	"sync"
+	"time"
+
+	"github.com/nspcc-dev/neofs-api-go/service"
+	"github.com/nspcc-dev/neofs-api-go/state"
+	"github.com/pkg/errors"
+	"github.com/spf13/viper"
+	"go.uber.org/atomic"
+	"go.uber.org/zap"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/connectivity"
+	"google.golang.org/grpc/keepalive"
+)
+
+type (
+	node struct {
+		index   int32
+		address string
+		weight  uint32
+		usedAt  time.Time
+		conn    *grpc.ClientConn
+	}
+
+	Client interface {
+		GetConnection(context.Context) (*grpc.ClientConn, error)
+	}
+
+	Pool interface {
+		Client
+
+		Close()
+		Status() error
+		ReBalance(ctx context.Context)
+	}
+
+	pool struct {
+		log *zap.Logger
+
+		ttl time.Duration
+
+		conTimeout time.Duration
+		reqTimeout time.Duration
+		opts       keepalive.ClientParameters
+
+		currentIdx  *atomic.Int32
+		currentConn *grpc.ClientConn
+
+		reqHealth *state.HealthRequest
+
+		*sync.Mutex
+		nodes []*node
+		keys  []uint32
+		conns map[uint32][]*node
+
+		unhealthy *atomic.Error
+	}
+)
+
+const (
+	minimumTTLInMinutes = 5
+
+	defaultTTL = minimumTTLInMinutes * time.Minute
+
+	defaultRequestTimeout = 15 * time.Second
+	defaultConnectTimeout = 30 * time.Second
+
+	defaultKeepaliveTime    = 10 * time.Second
+	defaultKeepaliveTimeout = 10 * time.Second
+)
+
+var (
+	errBootstrapping        = errors.New("bootstrapping")
+	errEmptyConnection      = errors.New("empty connection")
+	errNoHealthyConnections = errors.New("no active connections")
+
+	_ = New
+)
+
+func New(l *zap.Logger, v *viper.Viper, key *ecdsa.PrivateKey) (Pool, error) {
+	p := &pool{
+		log:   l,
+		Mutex: new(sync.Mutex),
+		keys:  make([]uint32, 0),
+		nodes: make([]*node, 0),
+		conns: make(map[uint32][]*node),
+
+		ttl: defaultTTL,
+
+		currentIdx: atomic.NewInt32(-1),
+
+		// fill with defaults:
+		reqTimeout: defaultRequestTimeout,
+		conTimeout: defaultConnectTimeout,
+		opts: keepalive.ClientParameters{
+			Time:                defaultKeepaliveTime,
+			Timeout:             defaultKeepaliveTimeout,
+			PermitWithoutStream: true,
+		},
+
+		unhealthy: atomic.NewError(errBootstrapping),
+	}
+
+	buf := make([]byte, 8)
+	if _, err := crand.Read(buf); err != nil {
+		return nil, err
+	}
+
+	seed := binary.BigEndian.Uint64(buf)
+	rand.Seed(int64(seed))
+	l.Info("used random seed", zap.Uint64("seed", seed))
+
+	p.reqHealth = new(state.HealthRequest)
+	p.reqHealth.SetTTL(service.NonForwardingTTL)
+
+	if err := service.SignDataWithSessionToken(key, p.reqHealth); err != nil {
+		return nil, errors.Wrap(err, "could not sign `HealthRequest`")
+	}
+
+	if val := v.GetDuration("conn_ttl"); val > 0 {
+		p.ttl = val
+	}
+
+	if val := v.GetDuration("request_timeout"); val > 0 {
+		p.reqTimeout = val
+	}
+
+	if val := v.GetDuration("connect_timeout"); val > 0 {
+		p.conTimeout = val
+	}
+
+	if val := v.GetDuration("keepalive.time"); val > 0 {
+		p.opts.Time = val
+	}
+
+	if val := v.GetDuration("keepalive.timeout"); val > 0 {
+		p.opts.Timeout = val
+	}
+
+	if v.IsSet("keepalive.permit_without_stream") {
+		p.opts.PermitWithoutStream = v.GetBool("keepalive.permit_without_stream")
+	}
+
+	for i := 0; ; i++ {
+		key := "peers." + strconv.Itoa(i) + "."
+		address := v.GetString(key + "address")
+		weight := v.GetFloat64(key + "weight")
+
+		if address == "" {
+			l.Warn("skip, empty address")
+			break
+		}
+
+		p.nodes = append(p.nodes, &node{
+			index:   int32(i),
+			address: address,
+			weight:  uint32(weight * 100),
+		})
+
+		l.Info("add new peer",
+			zap.String("address", p.nodes[i].address),
+			zap.Uint32("weight", p.nodes[i].weight))
+	}
+
+	return p, nil
+}
+
+func (p *pool) Status() error {
+	return p.unhealthy.Load()
+}
+
+func (p *pool) Close() {
+	p.Lock()
+	defer p.Unlock()
+
+	for i := range p.nodes {
+		if p.nodes[i] == nil || p.nodes[i].conn == nil {
+			continue
+		}
+
+		p.log.Warn("close connection",
+			zap.String("address", p.nodes[i].address),
+			zap.Error(p.nodes[i].conn.Close()))
+	}
+}
+
+func (p *pool) ReBalance(ctx context.Context) {
+	p.Lock()
+	defer func() {
+		p.Unlock()
+
+		_, err := p.GetConnection(ctx)
+		p.unhealthy.Store(err)
+	}()
+
+	keys := make(map[uint32]struct{})
+
+	p.log.Info("re-balancing connections")
+
+	for i := range p.nodes {
+		var (
+			idx    = -1
+			exists bool
+			err    error
+			start  = time.Now()
+			conn   = p.nodes[i].conn
+			weight = p.nodes[i].weight
+		)
+
+		if err = ctx.Err(); err != nil {
+			p.log.Warn("something went wrong", zap.Error(err))
+			p.unhealthy.Store(err)
+
+			return
+		}
+
+		if conn == nil {
+			p.log.Debug("empty connection, try to connect",
+				zap.String("address", p.nodes[i].address))
+
+			ctx, cancel := context.WithTimeout(ctx, p.conTimeout)
+			conn, err = grpc.DialContext(ctx, p.nodes[i].address,
+				grpc.WithBlock(),
+				grpc.WithInsecure(),
+				grpc.WithKeepaliveParams(p.opts))
+			cancel()
+
+			if err != nil || conn == nil {
+				p.log.Warn("skip, could not connect to node",
+					zap.String("address", p.nodes[i].address),
+					zap.Stringer("elapsed", time.Since(start)),
+					zap.Error(err))
+				continue
+			}
+
+			p.nodes[i].conn = conn
+			p.nodes[i].usedAt = time.Now()
+			p.log.Debug("connected to node", zap.String("address", p.nodes[i].address))
+		}
+
+		for j := range p.conns[weight] {
+			if p.conns[weight][j] != nil && p.conns[weight][j].conn == conn {
+				idx = j
+				exists = true
+				break
+			}
+		}
+
+		usedAt := time.Since(p.nodes[i].usedAt)
+
+		// if something wrong with connection (bad state, unhealthy or not used a long time), try to close it and remove
+		if err = p.isAlive(ctx, conn); err != nil || usedAt > p.ttl {
+			p.log.Warn("connection not alive",
+				zap.String("address", p.nodes[i].address),
+				zap.Stringer("since", usedAt),
+				zap.Error(err))
+
+			if exists {
+				// remove from connections
+				p.conns[weight] = append(p.conns[weight][:idx], p.conns[weight][idx+1:]...)
+			}
+
+			if err = conn.Close(); err != nil {
+				p.log.Warn("could not close bad connection",
+					zap.String("address", p.nodes[i].address),
+					zap.Stringer("since", usedAt),
+					zap.Error(err))
+			}
+
+			if p.nodes[i].conn != nil {
+				p.nodes[i].conn = nil
+			}
+			continue
+		}
+
+		keys[weight] = struct{}{}
+
+		p.log.Debug("connection alive",
+			zap.String("address", p.nodes[i].address),
+			zap.Stringer("since", usedAt))
+
+		if !exists {
+			p.conns[weight] = append(p.conns[weight], p.nodes[i])
+		}
+	}
+
+	p.keys = p.keys[:0]
+	for w := range keys {
+		p.keys = append(p.keys, w)
+	}
+
+	sort.Slice(p.keys, func(i, j int) bool {
+		return p.keys[i] > p.keys[j]
+	})
+}
+
+func (p *pool) GetConnection(ctx context.Context) (*grpc.ClientConn, error) {
+	p.Lock()
+	defer p.Unlock()
+
+	if err := p.isAlive(ctx, p.currentConn); err == nil {
+		if id := p.currentIdx.Load(); id != -1 && p.nodes[id] != nil {
+			p.nodes[id].usedAt = time.Now()
+		}
+
+		return p.currentConn, nil
+	}
+
+	for _, w := range p.keys {
+		switch ln := len(p.conns[w]); ln {
+		case 0:
+			continue
+		case 1:
+			p.currentConn = p.conns[w][0].conn
+			p.conns[w][0].usedAt = time.Now()
+			p.currentIdx.Store(p.conns[w][0].index)
+			return p.currentConn, nil
+		default: // > 1
+			i := rand.Intn(ln)
+			p.currentConn = p.conns[w][i].conn
+			p.conns[w][i].usedAt = time.Now()
+			p.currentIdx.Store(p.conns[w][i].index)
+			return p.currentConn, nil
+		}
+	}
+
+	p.currentConn = nil
+	p.currentIdx.Store(-1)
+
+	if ctx.Err() != nil {
+		return nil, ctx.Err()
+	}
+
+	return nil, errNoHealthyConnections
+}
+
+func (p *pool) isAlive(ctx context.Context, cur *grpc.ClientConn) error {
+	if cur == nil {
+		return errEmptyConnection
+	}
+
+	switch st := cur.GetState(); st {
+	case connectivity.Idle, connectivity.Ready, connectivity.Connecting:
+		ctx, cancel := context.WithTimeout(ctx, p.reqTimeout)
+		defer cancel()
+
+		res, err := state.NewStatusClient(cur).HealthCheck(ctx, p.reqHealth)
+		if err != nil {
+			p.log.Warn("could not fetch health-check", zap.Error(err))
+
+			return err
+		} else if !res.Healthy {
+			return errors.New(res.Status)
+		}
+
+		return nil
+	default:
+		return errors.New(st.String())
+	}
+}