implement k8s service discovery (#988)

* implement k8s service discovery

* simplify code

* use default namespace if not provided

* disable codecov bot comment

* ignore adhoc dir

* simplify building target in NewClient

* reformat code

* Fix filepath (#990)

* format code, and reorg imports (#991)

* add more unit test

Co-authored-by: anqiansong <anqiansong@gmail.com>

.codecov.yml

@@ -1,4 +1,5 @@
+comment: false
 ignore:
   - "doc"
   - "example"
-  - "tools"
+  - "tools"

.gitignore

@@ -10,10 +10,14 @@
 !*/
 !api
 
+# ignore
 .idea
 **/.DS_Store
 **/logs
 
+# ignore adhoc test code
+**/adhoc
+
 # gitlab ci
 .cache
 

core/proc/signals.go

@@ -1,3 +1,4 @@
+//go:build linux || darwin
 // +build linux darwin
 
 package proc
@@ -12,6 +13,8 @@ import (
 
 const timeFormat = "0102150405"
 
+var done = make(chan struct{})
+
 func init() {
 	go func() {
 		var profiler Stopper
@@ -33,6 +36,13 @@ func init() {
 					profiler = nil
 				}
 			case syscall.SIGTERM:
+				select {
+				case <-done:
+					// already closed
+				default:
+					close(done)
+				}
+
 				gracefulStop(signals)
 			default:
 				logx.Error("Got unregistered signal:", v)
@@ -40,3 +50,7 @@ func init() {
 		}
 	}()
 }
+
+func Done() <-chan struct{} {
+	return done
+}

core/proc/signals_test.go

@@ -0,0 +1,16 @@
+package proc
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestDone(t *testing.T) {
+	select {
+	case <-Done():
+		assert.Fail(t, "should run")
+	default:
+	}
+	assert.NotNil(t, Done())
+}

go.mod

@@ -18,18 +18,13 @@ require (
 	github.com/go-xorm/builder v0.3.4
 	github.com/golang/mock v1.4.3
 	github.com/golang/protobuf v1.5.2
-	github.com/google/go-cmp v0.5.6 // indirect
 	github.com/google/uuid v1.1.2
 	github.com/iancoleman/strcase v0.1.2
 	github.com/justinas/alice v1.2.0
-	github.com/kr/pretty v0.2.0 // indirect
-	github.com/kr/text v0.2.0 // indirect
 	github.com/lib/pq v1.3.0
 	github.com/logrusorgru/aurora v2.0.3+incompatible
 	github.com/mattn/go-colorable v0.1.6 // indirect
 	github.com/olekukonko/tablewriter v0.0.5
-	github.com/onsi/ginkgo v1.7.0 // indirect
-	github.com/onsi/gomega v1.5.0 // indirect
 	github.com/pierrec/lz4 v2.5.1+incompatible // indirect
 	github.com/prometheus/client_golang v1.11.0
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
@@ -41,18 +36,20 @@ require (
 	go.etcd.io/etcd/api/v3 v3.5.0
 	go.etcd.io/etcd/client/v3 v3.5.0
 	go.opentelemetry.io/otel v1.0.0-RC2
-	go.opentelemetry.io/otel/exporters/jaeger v1.0.0-RC2 // indirect
-	go.opentelemetry.io/otel/metric v0.20.0 // indirect
+	go.opentelemetry.io/otel/exporters/jaeger v1.0.0-RC2
 	go.opentelemetry.io/otel/sdk v1.0.0-RC2
 	go.opentelemetry.io/otel/trace v1.0.0-RC2
 	go.uber.org/automaxprocs v1.3.0
 	golang.org/x/net v0.0.0-20210716203947-853a461950ff
 	golang.org/x/sys v0.0.0-20210820121016-41cdb8703e55 // indirect
-	golang.org/x/time v0.0.0-20210220033141-f8bda1e9f3ba
+	golang.org/x/time v0.0.0-20210723032227-1f47c861a9ac
 	google.golang.org/genproto v0.0.0-20210722135532-667f2b7c528f // indirect
 	google.golang.org/grpc v1.39.0
 	google.golang.org/protobuf v1.27.1
 	gopkg.in/cheggaaa/pb.v1 v1.0.28
 	gopkg.in/h2non/gock.v1 v1.0.15
 	gopkg.in/yaml.v2 v2.4.0
+	k8s.io/api v0.22.1
+	k8s.io/apimachinery v0.22.1
+	k8s.io/client-go v0.22.1
 )

go.sum

@@ -1,10 +1,42 @@
 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 v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+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/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
+cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
+cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
+cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
+cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
+cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
+cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc=
+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/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
+cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw=
+cloud.google.com/go/pubsub v1.2.0/go.mod h1:jhfEVHT8odbXTkndysNHCcx0awwzvfOlguIAii9o8iA=
+cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
+cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos=
+cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohlUTyfDhBk=
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+github.com/Azure/go-autorest/logger v0.2.1/go.mod h1:T9E3cAhj2VqvPOtCYAvby9aBXkZmbF5NWuPV8+WeEW8=
+github.com/Azure/go-autorest/tracing v0.6.0/go.mod h1:+vhtPC754Xsa23ID7GlGsrdKBpUA79WCAKPPZVC2DeU=
 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/ClickHouse/clickhouse-go v1.4.3 h1:iAFMa2UrQdR5bHJ2/yaSLffZkxpcOYQMCUuKeNXGdqc=
 github.com/ClickHouse/clickhouse-go v1.4.3/go.mod h1:EaI/sW7Azgz9UATzd5ZdZHRUhHgv5+JMS9NSr2smCJI=
 github.com/DATA-DOG/go-sqlmock v1.4.1 h1:ThlnYciV1iM/V0OSF/dtkqWb6xo5qITT1TJBG1MRDJM=
 github.com/DATA-DOG/go-sqlmock v1.4.1/go.mod h1:f/Ixk793poVmq4qj/V1dPUg2JEAKC73Q5eFN3EC/SaM=
+github.com/NYTimes/gziphandler v0.0.0-20170623195520-56545f4a5d46/go.mod h1:3wb06e3pkSAbeQ52E9H9iFoQsEEwGN64994WTCIhntQ=
+github.com/PuerkitoBio/purell v1.1.1/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
+github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
 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=
@@ -17,6 +49,7 @@ github.com/alicebob/miniredis/v2 v2.14.1/go.mod h1:uS970Sw5Gs9/iK3yBg0l9Uj9s25wX
 github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
 github.com/antlr/antlr4/runtime/Go/antlr v0.0.0-20210521184019-c5ad59b459ec h1:EEyRvzmpEUZ+I8WmD5cw/vY8EqhambkOqy5iFr0908A=
 github.com/antlr/antlr4/runtime/Go/antlr v0.0.0-20210521184019-c5ad59b459ec/go.mod h1:F7bn7fEU90QkQ3tnmaTx3LTKLEDqnwWODIYppRQ5hnY=
+github.com/asaskevich/govalidator v0.0.0-20190424111038-f61b66f89f4a/go.mod h1:lB+ZfQJz7igIIfQNfa7Ml4HSf2uFQQRzpGGRXenZAgY=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
@@ -48,7 +81,10 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible h1:7qlOGliEKZXTDg6OTjfoBKDXWrumCAMpl/TFQ4/5kLM=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
+github.com/docopt/docopt-go v0.0.0-20180111231733-ee0de3bc6815/go.mod h1:WwZ+bS3ebgob9U8Nd0kOddGdZWjyMGR8Wziv+TBNwSE=
 github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
+github.com/elazarl/goproxy v0.0.0-20180725130230-947c36da3153/go.mod h1:/Zj4wYkgs4iZTTu3o/KG3Itv/qCCa8VVMlb3i9OVuzc=
+github.com/emicklei/go-restful v0.0.0-20170410110728-ff4f55a20633/go.mod h1:otzb+WCGbkyDHkqmQmT5YD2WR4BBwUdeQoFo8l/7tVs=
 github.com/emicklei/proto v1.9.0 h1:l0QiNT6Qs7Yj0Mb4X6dnWBQer4ebei2BFcgQLbGqUDc=
 github.com/emicklei/proto v1.9.0/go.mod h1:rn1FgRS/FANiZdD2djyH7TMA9jdRDcYQ9IEN9yvjX0A=
 github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
@@ -58,23 +94,36 @@ github.com/envoyproxy/go-control-plane v0.9.9-0.20201210154907-fd9021fe5dad/go.m
 github.com/envoyproxy/go-control-plane v0.9.9-0.20210217033140-668b12f5399d/go.mod h1:cXg6YxExXjJnVBQHBLXeUAgxn2UodCpnH306RInaBQk=
 github.com/envoyproxy/go-control-plane v0.9.9-0.20210512163311-63b5d3c536b0/go.mod h1:hliV/p42l8fGbc6Y9bQ70uLwIvmJyVE5k4iMKlh8wCQ=
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-github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
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 github.com/go-kit/log v0.1.0/go.mod h1:zbhenjAZHb184qTLMA9ZjW7ThYL0H2mk7Q6pNt4vbaY=
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+github.com/go-openapi/jsonpointer v0.19.3/go.mod h1:Pl9vOtqEWErmShwVjC8pYs9cog34VGT37dQOVbmoatg=
+github.com/go-openapi/jsonreference v0.19.3/go.mod h1:rjx6GuL8TTa9VaixXglHmQmIL98+wF9xc8zWvFonSJ8=
+github.com/go-openapi/swag v0.19.5/go.mod h1:POnQmlKehdgb5mhVOsnJFsivZCEZ/vjK9gh66Z9tfKk=
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@@ -90,13 +139,22 @@ github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7a
 github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q=
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@@ -108,6 +166,9 @@ github.com/golang/protobuf v1.4.3/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw
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@@ -118,22 +179,44 @@ github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
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@@ -155,6 +238,8 @@ github.com/lib/pq v1.3.0 h1:/qkRGz8zljWiDcFvgpwUpwIAPu3r07TDvs3Rws+o/pU=
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@@ -167,21 +252,36 @@ github.com/mattn/go-runewidth v0.0.9/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m
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@@ -221,6 +321,11 @@ github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6Mwd
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@@ -247,20 +352,16 @@ go.etcd.io/etcd/client/pkg/v3 v3.5.0 h1:2aQv6F436YnN7I4VbI8PPYrBhu+SmrTaADcf8Mi/
 go.etcd.io/etcd/client/pkg/v3 v3.5.0/go.mod h1:IJHfcCEKxYu1Os13ZdwCwIUTUVGYTSAM3YSwc9/Ac1g=
 go.etcd.io/etcd/client/v3 v3.5.0 h1:62Eh0XOro+rDwkrypAGDfgmNh5Joq+z+W9HZdlXMzek=
 go.etcd.io/etcd/client/v3 v3.5.0/go.mod h1:AIKXXVX/DQXtfTEqBryiLTUXwON+GuvO6Z7lLS/oTh0=
-go.opentelemetry.io/otel v0.20.0 h1:eaP0Fqu7SXHwvjiqDq83zImeehOHX8doTvU9AwXON8g=
-go.opentelemetry.io/otel v0.20.0/go.mod h1:Y3ugLH2oa81t5QO+Lty+zXf8zC9L26ax4Nzoxm/dooo=
+go.opencensus.io v0.21.0/go.mod h1:mSImk1erAIZhrmZN+AvHh14ztQfjbGwt4TtuofqLduU=
+go.opencensus.io v0.22.0/go.mod h1:+kGneAE2xo2IficOXnaByMWTGM9T73dGwxeWcUqIpI8=
+go.opencensus.io v0.22.2/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
+go.opencensus.io v0.22.3/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
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 go.opentelemetry.io/otel/exporters/jaeger v1.0.0-RC2/go.mod h1:sZZqN3Vb0iT+NE6mZ1S7sNyH3t4PFk6ElK5TLGFBZ7E=
-go.opentelemetry.io/otel/metric v0.20.0 h1:4kzhXFP+btKm4jwxpjIqjs41A7MakRFUS86bqLHTIw8=
-go.opentelemetry.io/otel/metric v0.20.0/go.mod h1:598I5tYlH1vzBjn+BTuhzTCSb/9debfNp6R3s7Pr1eU=
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-go.opentelemetry.io/otel/sdk v0.20.0/go.mod h1:g/IcepuwNsoiX5Byy2nNV0ySUF1em498m7hBWC279Yc=
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-go.opentelemetry.io/otel/trace v0.20.0 h1:1DL6EXUdcg95gukhuRRvLDO/4X5THh/5dIV52lqtnbw=
-go.opentelemetry.io/otel/trace v0.20.0/go.mod h1:6GjCW8zgDjwGHGa6GkyeB8+/5vjT16gUEi0Nf1iBdgw=
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@@ -275,16 +376,40 @@ go.uber.org/zap v1.17.0/go.mod h1:MXVU+bhUf/A7Xi2HNOnopQOrmycQ5Ih87HtOu4q5SSo=
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@@ -296,21 +421,38 @@ golang.org/x/net v0.0.0-20190108225652-1e06a53dbb7e/go.mod h1:mL1N/T3taQHkDXs73r
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@@ -323,13 +465,31 @@ golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5h
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@@ -374,19 +560,54 @@ golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8T
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+google.golang.org/genproto v0.0.0-20191230161307-f3c370f40bfb/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
+google.golang.org/genproto v0.0.0-20200115191322-ca5a22157cba/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
+google.golang.org/genproto v0.0.0-20200122232147-0452cf42e150/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
+google.golang.org/genproto v0.0.0-20200204135345-fa8e72b47b90/go.mod h1:GmwEX6Z4W5gMy59cAlVYjN9JhxgbQH6Gn+gFDQe2lzA=
+google.golang.org/genproto v0.0.0-20200212174721-66ed5ce911ce/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
+google.golang.org/genproto v0.0.0-20200224152610-e50cd9704f63/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
+google.golang.org/genproto v0.0.0-20200305110556-506484158171/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
 google.golang.org/genproto v0.0.0-20200513103714-09dca8ec2884/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
 google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013/go.mod h1:NbSheEEYHJ7i3ixzK3sjbqSGDJWnxyFXZblF3eUsNvo=
+google.golang.org/genproto v0.0.0-20201019141844-1ed22bb0c154/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20210602131652-f16073e35f0c/go.mod h1:UODoCrxHCcBojKKwX1terBiRUaqAsFqJiF615XL43r0=
 google.golang.org/genproto v0.0.0-20210722135532-667f2b7c528f h1:YORWxaStkWBnWgELOHTmDrqNlFXuVGEbhwbB5iK94bQ=
 google.golang.org/genproto v0.0.0-20210722135532-667f2b7c528f/go.mod h1:ob2IJxKrgPT52GcgX759i1sleT07tiKowYBGbczaW48=
 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=
 google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
 google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY=
+google.golang.org/grpc v1.26.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
 google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
+google.golang.org/grpc v1.27.1/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
 google.golang.org/grpc v1.33.1/go.mod h1:fr5YgcSWrqhRRxogOsw7RzIpsmvOZ6IcH4kBYTpR3n0=
 google.golang.org/grpc v1.36.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
 google.golang.org/grpc v1.38.0/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
@@ -400,6 +621,7 @@ google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzi
 google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4=
 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=
@@ -408,15 +630,17 @@ google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQ
 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=
-gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f h1:BLraFXnmrev5lT+xlilqcH8XK9/i0At2xKjWk4p6zsU=
+gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/cheggaaa/pb.v1 v1.0.28 h1:n1tBJnnK2r7g9OW2btFH91V92STTUevLXYFb8gy9EMk=
 gopkg.in/cheggaaa/pb.v1 v1.0.28/go.mod h1:V/YB90LKu/1FcN3WVnfiiE5oMCibMjukxqG/qStrOgw=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
-gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
 gopkg.in/h2non/gock.v1 v1.0.15 h1:SzLqcIlb/fDfg7UvukMpNcWsu7sI5tWwL+KCATZqks0=
 gopkg.in/h2non/gock.v1 v1.0.15/go.mod h1:sX4zAkdYX1TRGJ2JY156cFspQn4yRWn6p9EMdODlynE=
+gopkg.in/inf.v0 v0.9.1 h1:73M5CoZyi3ZLMOyDlQh031Cx6N9NDJ2Vvfl76EDAgDc=
+gopkg.in/inf.v0 v0.9.1/go.mod h1:cWUDdTG/fYaXco+Dcufb5Vnc6Gp2YChqWtbxRZE0mXw=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
@@ -429,11 +653,33 @@ gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b h1:h8qDotaEPuJATrMmW04NCwg7v22aHH28wwpauUhK9Oo=
 gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
 honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
+k8s.io/api v0.22.1 h1:ISu3tD/jRhYfSW8jI/Q1e+lRxkR7w9UwQEZ7FgslrwY=
+k8s.io/api v0.22.1/go.mod h1:bh13rkTp3F1XEaLGykbyRD2QaTTzPm0e/BMd8ptFONY=
+k8s.io/apimachinery v0.22.1 h1:DTARnyzmdHMz7bFWFDDm22AM4pLWTQECMpRTFu2d2OM=
+k8s.io/apimachinery v0.22.1/go.mod h1:O3oNtNadZdeOMxHFVxOreoznohCpy0z6mocxbZr7oJ0=
+k8s.io/client-go v0.22.1 h1:jW0ZSHi8wW260FvcXHkIa0NLxFBQszTlhiAVsU5mopw=
+k8s.io/client-go v0.22.1/go.mod h1:BquC5A4UOo4qVDUtoc04/+Nxp1MeHcVc1HJm1KmG8kk=
+k8s.io/gengo v0.0.0-20200413195148-3a45101e95ac/go.mod h1:ezvh/TsK7cY6rbqRK0oQQ8IAqLxYwwyPxAX1Pzy0ii0=
+k8s.io/klog/v2 v2.0.0/go.mod h1:PBfzABfn139FHAV07az/IF9Wp1bkk3vpT2XSJ76fSDE=
+k8s.io/klog/v2 v2.9.0 h1:D7HV+n1V57XeZ0m6tdRkfknthUaM06VFbWldOFh8kzM=
+k8s.io/klog/v2 v2.9.0/go.mod h1:hy9LJ/NvuK+iVyP4Ehqva4HxZG/oXyIS3n3Jmire4Ec=
+k8s.io/kube-openapi v0.0.0-20210421082810-95288971da7e/go.mod h1:vHXdDvt9+2spS2Rx9ql3I8tycm3H9FDfdUoIuKCefvw=
+k8s.io/utils v0.0.0-20210707171843-4b05e18ac7d9 h1:imL9YgXQ9p7xmPzHFm/vVd/cF78jad+n4wK1ABwYtMM=
+k8s.io/utils v0.0.0-20210707171843-4b05e18ac7d9/go.mod h1:jPW/WVKK9YHAvNhRxK0md/EJ228hCsBRufyofKtW8HA=
+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
 rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
 rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
+sigs.k8s.io/structured-merge-diff/v4 v4.0.2/go.mod h1:bJZC9H9iH24zzfZ/41RGcq60oK1F7G282QMXDPYydCw=
+sigs.k8s.io/structured-merge-diff/v4 v4.1.2 h1:Hr/htKFmJEbtMgS/UD0N+gtgctAqz81t3nu+sPzynno=
+sigs.k8s.io/structured-merge-diff/v4 v4.1.2/go.mod h1:j/nl6xW8vLS49O8YvXW1ocPhZawJtm+Yrr7PPRQ0Vg4=
+sigs.k8s.io/yaml v1.2.0 h1:kr/MCeFWJWTwyaHoR9c8EjH9OumOmoF9YGiZd7lFm/Q=
 sigs.k8s.io/yaml v1.2.0/go.mod h1:yfXDCHCao9+ENCvLSE62v9VSji2MKu5jeNfTrofGhJc=

zrpc/client.go

@@ -55,13 +55,21 @@ func NewClient(c RpcClientConf, options ...ClientOption) (Client, error) {
 	}
 	opts = append(opts, options...)
 
-	var client Client
+	var target string
 	var err error
 	if len(c.Endpoints) > 0 {
-		client, err = internal.NewClient(internal.BuildDirectTarget(c.Endpoints), opts...)
-	} else if err = c.Etcd.Validate(); err == nil {
-		client, err = internal.NewClient(internal.BuildDiscovTarget(c.Etcd.Hosts, c.Etcd.Key), opts...)
+		target = internal.BuildDirectTarget(c.Endpoints)
+	} else if len(c.Target) > 0 {
+		target = c.Target
+	} else {
+		if err = c.Etcd.Validate(); err != nil {
+			return nil, err
+		}
+
+		target = internal.BuildDiscovTarget(c.Etcd.Hosts, c.Etcd.Key)
 	}
+
+	client, err := internal.NewClient(target, opts...)
 	if err != nil {
 		return nil, err
 	}

zrpc/config.go

@@ -23,7 +23,8 @@ type (
 	// A RpcClientConf is a rpc client config.
 	RpcClientConf struct {
 		Etcd      discov.EtcdConf `json:",optional"`
-		Endpoints []string        `json:",optional=!Etcd"`
+		Endpoints []string        `json:",optional"`
+		Target    string          `json:",optional"`
 		App       string          `json:",optional"`
 		Token     string          `json:",optional"`
 		Timeout   int64           `json:",default=2000"`

zrpc/internal/resolver/directbuilder.go

@@ -20,9 +20,11 @@ func (d *directBuilder) Build(target resolver.Target, cc resolver.ClientConn, op
 			Addr: val,
 		})
 	}
-	cc.UpdateState(resolver.State{
+	if err := cc.UpdateState(resolver.State{
 		Addresses: addrs,
-	})
+	}); err != nil {
+		return nil, err
+	}
 
 	return &nopResolver{cc: cc}, nil
 }

zrpc/internal/resolver/discovbuilder.go

@@ -4,12 +4,13 @@ import (
 	"strings"
 
 	"github.com/tal-tech/go-zero/core/discov"
+	"github.com/tal-tech/go-zero/core/logx"
 	"google.golang.org/grpc/resolver"
 )
 
 type discovBuilder struct{}
 
-func (d *discovBuilder) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOptions) (
+func (b *discovBuilder) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOptions) (
 	resolver.Resolver, error) {
 	hosts := strings.FieldsFunc(target.Authority, func(r rune) bool {
 		return r == EndpointSepChar
@@ -26,9 +27,11 @@ func (d *discovBuilder) Build(target resolver.Target, cc resolver.ClientConn, op
 				Addr: val,
 			})
 		}
-		cc.UpdateState(resolver.State{
+		if err := cc.UpdateState(resolver.State{
 			Addresses: addrs,
-		})
+		}); err != nil {
+			logx.Error(err)
+		}
 	}
 	sub.AddListener(update)
 	update()
@@ -36,6 +39,6 @@ func (d *discovBuilder) Build(target resolver.Target, cc resolver.ClientConn, op
 	return &nopResolver{cc: cc}, nil
 }
 
-func (d *discovBuilder) Scheme() string {
+func (b *discovBuilder) Scheme() string {
 	return DiscovScheme
 }

zrpc/internal/resolver/discovbuilder_test.go

@@ -0,0 +1,12 @@
+package resolver
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestDiscovBuilder_Scheme(t *testing.T) {
+	var b discovBuilder
+	assert.Equal(t, DiscovScheme, b.Scheme())
+}

zrpc/internal/resolver/kube/eventhandler.go

@@ -0,0 +1,133 @@
+package kube
+
+import (
+	"sync"
+
+	"github.com/tal-tech/go-zero/core/lang"
+	"github.com/tal-tech/go-zero/core/logx"
+	v1 "k8s.io/api/core/v1"
+)
+
+type EventHandler struct {
+	update    func([]string)
+	endpoints map[string]lang.PlaceholderType
+	lock      sync.Mutex
+}
+
+func NewEventHandler(update func([]string)) *EventHandler {
+	return &EventHandler{
+		update:    update,
+		endpoints: make(map[string]lang.PlaceholderType),
+	}
+}
+
+func (h *EventHandler) OnAdd(obj interface{}) {
+	endpoints, ok := obj.(*v1.Endpoints)
+	if !ok {
+		logx.Errorf("%v is not an object with type *v1.Endpoints", obj)
+		return
+	}
+
+	h.lock.Lock()
+	defer h.lock.Unlock()
+
+	var changed bool
+	for _, sub := range endpoints.Subsets {
+		for _, point := range sub.Addresses {
+			if _, ok := h.endpoints[point.IP]; !ok {
+				h.endpoints[point.IP] = lang.Placeholder
+				changed = true
+			}
+		}
+	}
+
+	if changed {
+		h.notify()
+	}
+}
+
+func (h *EventHandler) OnDelete(obj interface{}) {
+	endpoints, ok := obj.(*v1.Endpoints)
+	if !ok {
+		logx.Errorf("%v is not an object with type *v1.Endpoints", obj)
+		return
+	}
+
+	h.lock.Lock()
+	defer h.lock.Unlock()
+
+	var changed bool
+	for _, sub := range endpoints.Subsets {
+		for _, point := range sub.Addresses {
+			if _, ok := h.endpoints[point.IP]; ok {
+				delete(h.endpoints, point.IP)
+				changed = true
+			}
+		}
+	}
+
+	if changed {
+		h.notify()
+	}
+}
+
+func (h *EventHandler) OnUpdate(oldObj, newObj interface{}) {
+	oldEndpoints, ok := oldObj.(*v1.Endpoints)
+	if !ok {
+		logx.Errorf("%v is not an object with type *v1.Endpoints", oldObj)
+		return
+	}
+
+	newEndpoints, ok := newObj.(*v1.Endpoints)
+	if !ok {
+		logx.Errorf("%v is not an object with type *v1.Endpoints", newObj)
+		return
+	}
+
+	if oldEndpoints.ResourceVersion == newEndpoints.ResourceVersion {
+		return
+	}
+
+	h.Update(newEndpoints)
+}
+
+func (h *EventHandler) Update(endpoints *v1.Endpoints) {
+	h.lock.Lock()
+	defer h.lock.Unlock()
+
+	old := h.endpoints
+	h.endpoints = make(map[string]lang.PlaceholderType)
+	for _, sub := range endpoints.Subsets {
+		for _, point := range sub.Addresses {
+			h.endpoints[point.IP] = lang.Placeholder
+		}
+	}
+
+	if diff(old, h.endpoints) {
+		h.notify()
+	}
+}
+
+func (h *EventHandler) notify() {
+	var targets []string
+
+	for k := range h.endpoints {
+		targets = append(targets, k)
+	}
+
+	h.update(targets)
+}
+
+func diff(o, n map[string]lang.PlaceholderType) bool {
+	if len(o) != len(n) {
+		return true
+	}
+
+	for k := range o {
+		if _, ok := n[k]; !ok {
+			return true
+		}
+	}
+
+	return false
+}

zrpc/internal/resolver/kube/eventhandler_test.go

@@ -0,0 +1,276 @@
+package kube
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	v1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+func TestAdd(t *testing.T) {
+	var endpoints []string
+	h := NewEventHandler(func(change []string) {
+		endpoints = change
+	})
+	h.OnAdd("bad")
+	h.OnAdd(&v1.Endpoints{Subsets: []v1.EndpointSubset{
+		{
+			Addresses: []v1.EndpointAddress{
+				{
+					IP: "0.0.0.1",
+				},
+				{
+					IP: "0.0.0.2",
+				},
+				{
+					IP: "0.0.0.3",
+				},
+			},
+		},
+	}})
+	assert.ElementsMatch(t, []string{"0.0.0.1", "0.0.0.2", "0.0.0.3"}, endpoints)
+}
+
+func TestDelete(t *testing.T) {
+	var endpoints []string
+	h := NewEventHandler(func(change []string) {
+		endpoints = change
+	})
+	h.OnAdd(&v1.Endpoints{Subsets: []v1.EndpointSubset{
+		{
+			Addresses: []v1.EndpointAddress{
+				{
+					IP: "0.0.0.1",
+				},
+				{
+					IP: "0.0.0.2",
+				},
+				{
+					IP: "0.0.0.3",
+				},
+			},
+		},
+	}})
+	h.OnDelete("bad")
+	h.OnDelete(&v1.Endpoints{Subsets: []v1.EndpointSubset{
+		{
+			Addresses: []v1.EndpointAddress{
+				{
+					IP: "0.0.0.1",
+				},
+				{
+					IP: "0.0.0.2",
+				},
+			},
+		},
+	}})
+	assert.ElementsMatch(t, []string{"0.0.0.3"}, endpoints)
+}
+
+func TestUpdate(t *testing.T) {
+	var endpoints []string
+	h := NewEventHandler(func(change []string) {
+		endpoints = change
+	})
+	h.OnUpdate(&v1.Endpoints{
+		Subsets: []v1.EndpointSubset{
+			{
+				Addresses: []v1.EndpointAddress{
+					{
+						IP: "0.0.0.1",
+					},
+					{
+						IP: "0.0.0.2",
+					},
+				},
+			},
+		},
+		ObjectMeta: metav1.ObjectMeta{
+			ResourceVersion: "1",
+		},
+	}, &v1.Endpoints{
+		Subsets: []v1.EndpointSubset{
+			{
+				Addresses: []v1.EndpointAddress{
+					{
+						IP: "0.0.0.1",
+					},
+					{
+						IP: "0.0.0.2",
+					},
+					{
+						IP: "0.0.0.3",
+					},
+				},
+			},
+		},
+		ObjectMeta: metav1.ObjectMeta{
+			ResourceVersion: "2",
+		},
+	})
+	assert.ElementsMatch(t, []string{"0.0.0.1", "0.0.0.2", "0.0.0.3"}, endpoints)
+}
+
+func TestUpdateNoChange(t *testing.T) {
+	h := NewEventHandler(func(change []string) {
+		assert.Fail(t, "should not called")
+	})
+	h.OnUpdate(&v1.Endpoints{
+		Subsets: []v1.EndpointSubset{
+			{
+				Addresses: []v1.EndpointAddress{
+					{
+						IP: "0.0.0.1",
+					},
+					{
+						IP: "0.0.0.2",
+					},
+				},
+			},
+		},
+		ObjectMeta: metav1.ObjectMeta{
+			ResourceVersion: "1",
+		},
+	}, &v1.Endpoints{
+		Subsets: []v1.EndpointSubset{
+			{
+				Addresses: []v1.EndpointAddress{
+					{
+						IP: "0.0.0.1",
+					},
+					{
+						IP: "0.0.0.2",
+					},
+				},
+			},
+		},
+		ObjectMeta: metav1.ObjectMeta{
+			ResourceVersion: "1",
+		},
+	})
+}
+
+func TestUpdateChangeWithDifferentVersion(t *testing.T) {
+	var endpoints []string
+	h := NewEventHandler(func(change []string) {
+		endpoints = change
+	})
+	h.OnAdd(&v1.Endpoints{Subsets: []v1.EndpointSubset{
+		{
+			Addresses: []v1.EndpointAddress{
+				{
+					IP: "0.0.0.1",
+				},
+				{
+					IP: "0.0.0.3",
+				},
+			},
+		},
+	}})
+	h.OnUpdate(&v1.Endpoints{
+		Subsets: []v1.EndpointSubset{
+			{
+				Addresses: []v1.EndpointAddress{
+					{
+						IP: "0.0.0.1",
+					},
+					{
+						IP: "0.0.0.3",
+					},
+				},
+			},
+		},
+		ObjectMeta: metav1.ObjectMeta{
+			ResourceVersion: "1",
+		},
+	}, &v1.Endpoints{
+		Subsets: []v1.EndpointSubset{
+			{
+				Addresses: []v1.EndpointAddress{
+					{
+						IP: "0.0.0.1",
+					},
+					{
+						IP: "0.0.0.2",
+					},
+				},
+			},
+		},
+		ObjectMeta: metav1.ObjectMeta{
+			ResourceVersion: "2",
+		},
+	})
+	assert.ElementsMatch(t, []string{"0.0.0.1", "0.0.0.2"}, endpoints)
+}
+
+func TestUpdateNoChangeWithDifferentVersion(t *testing.T) {
+	var endpoints []string
+	h := NewEventHandler(func(change []string) {
+		endpoints = change
+	})
+	h.OnAdd(&v1.Endpoints{Subsets: []v1.EndpointSubset{
+		{
+			Addresses: []v1.EndpointAddress{
+				{
+					IP: "0.0.0.1",
+				},
+				{
+					IP: "0.0.0.2",
+				},
+			},
+		},
+	}})
+	h.OnUpdate("bad", &v1.Endpoints{Subsets: []v1.EndpointSubset{
+		{
+			Addresses: []v1.EndpointAddress{
+				{
+					IP: "0.0.0.1",
+				},
+			},
+		},
+	}})
+	h.OnUpdate(&v1.Endpoints{Subsets: []v1.EndpointSubset{
+		{
+			Addresses: []v1.EndpointAddress{
+				{
+					IP: "0.0.0.1",
+				},
+			},
+		},
+	}}, "bad")
+	h.OnUpdate(&v1.Endpoints{
+		Subsets: []v1.EndpointSubset{
+			{
+				Addresses: []v1.EndpointAddress{
+					{
+						IP: "0.0.0.1",
+					},
+					{
+						IP: "0.0.0.2",
+					},
+				},
+			},
+		},
+		ObjectMeta: metav1.ObjectMeta{
+			ResourceVersion: "1",
+		},
+	}, &v1.Endpoints{
+		Subsets: []v1.EndpointSubset{
+			{
+				Addresses: []v1.EndpointAddress{
+					{
+						IP: "0.0.0.1",
+					},
+					{
+						IP: "0.0.0.2",
+					},
+				},
+			},
+		},
+		ObjectMeta: metav1.ObjectMeta{
+			ResourceVersion: "2",
+		},
+	})
+	assert.ElementsMatch(t, []string{"0.0.0.1", "0.0.0.2"}, endpoints)
+}

zrpc/internal/resolver/kube/targetparser.go

@@ -0,0 +1,45 @@
+package kube
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+
+	"google.golang.org/grpc/resolver"
+)
+
+const (
+	colon            = ":"
+	defaultNamespace = "default"
+)
+
+var emptyService Service
+
+type Service struct {
+	Namespace string
+	Name      string
+	Port      int
+}
+
+func ParseTarget(target resolver.Target) (Service, error) {
+	var service Service
+	service.Namespace = target.Authority
+	if len(service.Namespace) == 0 {
+		service.Namespace = defaultNamespace
+	}
+
+	segs := strings.SplitN(target.Endpoint, colon, 2)
+	if len(segs) < 2 {
+		return emptyService, fmt.Errorf("bad endpoint: %s", target.Endpoint)
+	}
+
+	service.Name = segs[0]
+	port, err := strconv.Atoi(segs[1])
+	if err != nil {
+		return emptyService, err
+	}
+
+	service.Port = port
+
+	return service, nil
+}

zrpc/internal/resolver/kube/targetparser_test.go

@@ -0,0 +1,83 @@
+package kube
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"google.golang.org/grpc/resolver"
+)
+
+func TestParseTarget(t *testing.T) {
+	tests := []struct {
+		name   string
+		input  resolver.Target
+		expect Service
+		hasErr bool
+	}{
+		{
+			name: "normal case",
+			input: resolver.Target{
+				Scheme:    "k8s",
+				Authority: "ns1",
+				Endpoint:  "my-svc:8080",
+			},
+			expect: Service{
+				Namespace: "ns1",
+				Name:      "my-svc",
+				Port:      8080,
+			},
+		},
+		{
+			name: "normal case",
+			input: resolver.Target{
+				Scheme:    "k8s",
+				Authority: "",
+				Endpoint:  "my-svc:8080",
+			},
+			expect: Service{
+				Namespace: defaultNamespace,
+				Name:      "my-svc",
+				Port:      8080,
+			},
+		},
+		{
+			name: "no port",
+			input: resolver.Target{
+				Scheme:    "k8s",
+				Authority: "ns1",
+				Endpoint:  "my-svc:",
+			},
+			hasErr: true,
+		},
+		{
+			name: "no port, no colon",
+			input: resolver.Target{
+				Scheme:    "k8s",
+				Authority: "ns1",
+				Endpoint:  "my-svc",
+			},
+			hasErr: true,
+		},
+		{
+			name: "bad port",
+			input: resolver.Target{
+				Scheme:    "k8s",
+				Authority: "ns1",
+				Endpoint:  "my-svc:800a",
+			},
+			hasErr: true,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			svc, err := ParseTarget(test.input)
+			if test.hasErr {
+				assert.NotNil(t, err)
+			} else {
+				assert.Nil(t, err)
+				assert.Equal(t, test.expect, svc)
+			}
+		})
+	}
+}

zrpc/internal/resolver/kubebuilder.go

@@ -0,0 +1,80 @@
+package resolver
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/tal-tech/go-zero/core/logx"
+	"github.com/tal-tech/go-zero/core/proc"
+	"github.com/tal-tech/go-zero/core/threading"
+	"github.com/tal-tech/go-zero/zrpc/internal/resolver/kube"
+	"google.golang.org/grpc/resolver"
+	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/informers"
+	"k8s.io/client-go/kubernetes"
+	"k8s.io/client-go/rest"
+)
+
+const (
+	resyncInterval = 5 * time.Minute
+	nameSelector   = "metadata.name="
+)
+
+type kubeBuilder struct{}
+
+func (b *kubeBuilder) Build(target resolver.Target, cc resolver.ClientConn,
+	opts resolver.BuildOptions) (resolver.Resolver, error) {
+	svc, err := kube.ParseTarget(target)
+	if err != nil {
+		return nil, err
+	}
+
+	config, err := rest.InClusterConfig()
+	if err != nil {
+		return nil, err
+	}
+
+	cs, err := kubernetes.NewForConfig(config)
+	if err != nil {
+		return nil, err
+	}
+
+	handler := kube.NewEventHandler(func(endpoints []string) {
+		var addrs []resolver.Address
+		for _, val := range subset(endpoints, subsetSize) {
+			addrs = append(addrs, resolver.Address{
+				Addr: fmt.Sprintf("%s:%d", val, svc.Port),
+			})
+		}
+
+		if err := cc.UpdateState(resolver.State{
+			Addresses: addrs,
+		}); err != nil {
+			logx.Error(err)
+		}
+	})
+	inf := informers.NewSharedInformerFactoryWithOptions(cs, resyncInterval,
+		informers.WithNamespace(svc.Namespace),
+		informers.WithTweakListOptions(func(options *v1.ListOptions) {
+			options.FieldSelector = nameSelector + svc.Name
+		}))
+	in := inf.Core().V1().Endpoints()
+	in.Informer().AddEventHandler(handler)
+	threading.GoSafe(func() {
+		inf.Start(proc.Done())
+	})
+
+	endpoints, err := cs.CoreV1().Endpoints(svc.Namespace).Get(context.Background(), svc.Name, v1.GetOptions{})
+	if err != nil {
+		return nil, err
+	}
+
+	handler.Update(endpoints)
+
+	return &nopResolver{cc: cc}, nil
+}
+
+func (b *kubeBuilder) Scheme() string {
+	return KubernetesScheme
+}

zrpc/internal/resolver/kubebuilder_test.go

@@ -0,0 +1,12 @@
+package resolver
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestKubeBuilder_Scheme(t *testing.T) {
+	var b kubeBuilder
+	assert.Equal(t, KubernetesScheme, b.Scheme())
+}

zrpc/internal/resolver/resolver.go

@@ -11,6 +11,8 @@ const (
 	DirectScheme = "direct"
 	// DiscovScheme stands for discov scheme.
 	DiscovScheme = "discov"
+	// KubernetesScheme stands for k8s scheme.
+	KubernetesScheme = "k8s"
 	// EndpointSepChar is the separator cha in endpoints.
 	EndpointSepChar = ','
 
@@ -23,12 +25,14 @@ var (
 
 	dirBuilder directBuilder
 	disBuilder discovBuilder
+	k8sBuilder kubeBuilder
 )
 
 // RegisterResolver registers the direct and discov schemes to the resolver.
 func RegisterResolver() {
 	resolver.Register(&dirBuilder)
 	resolver.Register(&disBuilder)
+	resolver.Register(&k8sBuilder)
 }
 
 type nopResolver struct {

zrpc/internal/rpcpubserver.go

@@ -14,7 +14,8 @@ const (
 )
 
 // NewRpcPubServer returns a Server.
-func NewRpcPubServer(etcdEndpoints []string, etcdKey, listenOn string, opts ...ServerOption) (Server, error) {
+func NewRpcPubServer(etcdEndpoints []string, etcdKey, listenOn string,
+	opts ...ServerOption) (Server, error) {
 	registerEtcd := func() error {
 		pubListenOn := figureOutListenOn(listenOn)
 		pubClient := discov.NewPublisher(etcdEndpoints, etcdKey, pubListenOn)