chore(registry): unified management of decentralized warehouses (#1368)

* chore(registry): unified management of decentralized warehouses

examples/go.mod

@@ -5,16 +5,22 @@ go 1.16
 require (
 	entgo.io/ent v0.9.0
 	github.com/BurntSushi/toml v0.3.1
+	github.com/aliyun/alibaba-cloud-sdk-go v1.61.1110 // indirect
+	github.com/buger/jsonparser v1.1.1 // indirect
 	github.com/envoyproxy/protoc-gen-validate v0.6.1
 	github.com/gin-gonic/gin v1.7.3
+	github.com/go-errors/errors v1.4.0 // indirect
 	github.com/go-kratos/consul v0.1.4
 	github.com/go-kratos/etcd v0.1.3
 	github.com/go-kratos/gin v0.1.0
-	github.com/go-kratos/kratos/v2 v2.0.3
+	github.com/go-kratos/kratos/registry/consul/v2 v2.0.0-00010101000000-000000000000
-	github.com/go-kratos/nacos v0.1.1
+	github.com/go-kratos/kratos/registry/etcd/v2 v2.0.0-00010101000000-000000000000
+	github.com/go-kratos/kratos/registry/nacos/v2 v2.0.0-00010101000000-000000000000
+	github.com/go-kratos/kratos/registry/zookeeper/v2 v2.0.0-00010101000000-000000000000
+	github.com/go-kratos/kratos/v2 v2.0.5
 	github.com/go-kratos/prometheus v0.0.0-20210522055322-137e29e7cf47
 	github.com/go-kratos/swagger-api v1.0.0
-	github.com/go-kratos/zookeeper v0.0.0-20210721021028-9e7498619b89
+	github.com/go-playground/validator/v10 v10.6.1 // indirect
 	github.com/go-redis/redis/extra/redisotel v0.3.0
 	github.com/go-redis/redis/v8 v8.11.2
 	github.com/go-sql-driver/mysql v1.6.0
@@ -24,23 +30,37 @@ require (
 	github.com/gorilla/websocket v1.4.2
 	github.com/grpc-ecosystem/grpc-gateway/v2 v2.5.0
 	github.com/hashicorp/consul/api v1.9.1
+	github.com/hashicorp/go-sockaddr v1.0.2 // indirect
+	github.com/jmespath/go-jmespath v0.4.0 // indirect
+	github.com/kr/text v0.2.0 // indirect
 	github.com/labstack/echo/v4 v4.5.0
+	github.com/leodido/go-urn v1.2.1 // indirect
 	github.com/nacos-group/nacos-sdk-go v1.0.8
 	github.com/nicksnyder/go-i18n/v2 v2.1.2
 	github.com/prometheus/client_golang v1.11.0
 	github.com/segmentio/kafka-go v0.4.17
 	github.com/sirupsen/logrus v1.8.1
 	github.com/stretchr/testify v1.7.0
+	github.com/ugorji/go v1.2.6 // indirect
 	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
 	go.opentelemetry.io/otel/sdk v1.0.0-RC2
 	go.opentelemetry.io/otel/trace v1.0.0-RC2
 	go.uber.org/zap v1.19.0
+	golang.org/x/crypto v0.0.0-20210616213533-5ff15b29337e // indirect
 	golang.org/x/text v0.3.6
 	google.golang.org/genproto v0.0.0-20210805201207-89edb61ffb67
-	google.golang.org/grpc v1.39.1
+	google.golang.org/grpc v1.40.0
 	google.golang.org/protobuf v1.27.1
+	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
+	gopkg.in/ini.v1 v1.62.0 // indirect
 )
 
-replace github.com/go-kratos/kratos/v2 => ../
+replace (
+	github.com/go-kratos/kratos/registry/consul/v2 => ../registry/consul
+	github.com/go-kratos/kratos/registry/etcd/v2 => ../registry/etcd
+	github.com/go-kratos/kratos/registry/nacos/v2 => ../registry/nacos
+	github.com/go-kratos/kratos/registry/zookeeper/v2 => ../registry/zookeeper
+	github.com/go-kratos/kratos/v2 => ../
+)

examples/go.sum

@@ -32,7 +32,6 @@ cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohl
 cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RXyy7KQOVs=
 cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0=
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
-entgo.io/ent v0.8.0/go.mod h1:KNjsukat/NJi6zJh1utwRadsbGOZsBbAZNDxkW7tMCc=
 entgo.io/ent v0.9.0 h1:2S1zfpMMW6p+wctj6kcYUprNPNjLWFW06T5MdyAfmWc=
 entgo.io/ent v0.9.0/go.mod h1:6NUeTfUN5mp5YN+5tgoH1SlakSvYPTBOYotSOvaI4ak=
 github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
@@ -106,8 +105,6 @@ github.com/coreos/go-semver v0.3.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3Ee
 github.com/coreos/go-systemd v0.0.0-20180511133405-39ca1b05acc7/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
 github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e h1:Wf6HqHfScWJN9/ZjdUKyjop4mf3Qdd+1TvvltAvM3m8=
 github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
-github.com/coreos/go-systemd/v22 v22.1.0/go.mod h1:xO0FLkIi5MaZafQlIrOotqXZ90ih+1atmu1JpKERPPk=
-github.com/coreos/go-systemd/v22 v22.3.1/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
 github.com/coreos/go-systemd/v22 v22.3.2 h1:D9/bQk5vlXQFZ6Kwuu6zaiXJ9oTPe68++AzAJc1DzSI=
 github.com/coreos/go-systemd/v22 v22.3.2/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
 github.com/coreos/pkg v0.0.0-20160727233714-3ac0863d7acf/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
@@ -116,7 +113,6 @@ github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:ma
 github.com/cpuguy83/go-md2man/v2 v2.0.0/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/creack/pty v1.1.7/go.mod h1:lj5s0c3V2DBrqTV7llrYr5NG6My20zk30Fl46Y7DoTY=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
-github.com/creack/pty v1.1.11/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 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=
@@ -174,27 +170,18 @@ github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2
 github.com/go-kit/kit v0.9.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
 github.com/go-kit/kit v0.10.0/go.mod h1:xUsJbQ/Fp4kEt7AFgCuvyX4a71u8h9jB8tj/ORgOZ7o=
 github.com/go-kit/log v0.1.0/go.mod h1:zbhenjAZHb184qTLMA9ZjW7ThYL0H2mk7Q6pNt4vbaY=
-github.com/go-kratos/consul v0.1.2/go.mod h1:FhxdCfkqaqIYfgpGbzGb8ywM/zV3jk+EBS+WSy1FzQQ=
 github.com/go-kratos/consul v0.1.4 h1:qOOQE/FYpbWLV4cipC+jPrrc/gQY1DdfnX0IJvQleXE=
 github.com/go-kratos/consul v0.1.4/go.mod h1:egsB9apqg+4BMYVnY/VuQCeC3aAmd7mpYfIMhs4ga4U=
-github.com/go-kratos/etcd v0.1.0/go.mod h1:RzWYbka3LjS0v2RbCtADN7d2Ng8eH774ehHlTGgbma4=
 github.com/go-kratos/etcd v0.1.3 h1:ARz1j4nZGgpeSw8WYau5y8LiKbsty/tMASQCaiOGZnM=
 github.com/go-kratos/etcd v0.1.3/go.mod h1:4UAwbmm/PIjUS9KwhqmfsBi9pksuvwc3ae+xaKF0Lwk=
 github.com/go-kratos/gin v0.1.0 h1:yq5GfZnSNo8cOIqxqPE0FVNQ8fm++oKQBd3/rTTp4oI=
 github.com/go-kratos/gin v0.1.0/go.mod h1:KzE88+mV1QJdmiT+sU2D560ucOXnWZx+4m0OnVcSyzQ=
 github.com/go-kratos/grpc-gateway/v2 v2.0.0-20210804092615-bdc92eb5ce83 h1:YN1KsqX3mB8hkSrOLZv3xZaZh+lZ/L7QC00RATFLJSg=
 github.com/go-kratos/grpc-gateway/v2 v2.0.0-20210804092615-bdc92eb5ce83/go.mod h1:qV5/s5A7wfY7GkNzptcUFRGAG4Y8H4mlXpSrOkDEIk0=
-github.com/go-kratos/kratos/examples v0.0.0-20210718121552-f0d077a3286f/go.mod h1:R5ZvhHSeFgk+JynHp3yMSkjaATRA3FRatecP4kQibsg=
-github.com/go-kratos/nacos v0.1.0/go.mod h1:qhVsyp6RyDDEKLtT0/iTMaN3D7SheRMrYb2bV0jYqjw=
-github.com/go-kratos/nacos v0.1.1 h1:0d3+yucPGIin+RSw+EDnbJAzJCOZn6Ci3b5Pn5SghTY=
-github.com/go-kratos/nacos v0.1.1/go.mod h1:qhVsyp6RyDDEKLtT0/iTMaN3D7SheRMrYb2bV0jYqjw=
 github.com/go-kratos/prometheus v0.0.0-20210522055322-137e29e7cf47 h1:uJennLdg0rwhrIl0bjsObwub+I3U0vJGAhpK6CYASrM=
 github.com/go-kratos/prometheus v0.0.0-20210522055322-137e29e7cf47/go.mod h1:e3D0pnFDX5SG+ZGmGONd83WvrbmFWCdx5l4Hkl3I1eY=
-github.com/go-kratos/swagger-api v0.1.8/go.mod h1:HMI1NY/OWbjbkZF2z//tEKoL1XpZOzyxOedtBddEyZE=
 github.com/go-kratos/swagger-api v1.0.0 h1:R1JcAqLSvfDzqHoDnpK3Jt1MEJAXGNifV7AnBEhP3PE=
 github.com/go-kratos/swagger-api v1.0.0/go.mod h1:BPeS1OUN4jtMitb99ptZAagAgyQ51S2F2vd9dT/J3eM=
-github.com/go-kratos/zookeeper v0.0.0-20210721021028-9e7498619b89 h1:OgoIdQOUOA0bCjaA2Mu6YNTGDpKDeu4Ced+nVUkqXqk=
-github.com/go-kratos/zookeeper v0.0.0-20210721021028-9e7498619b89/go.mod h1:c3T3e5hA+/cfiha99+un7TXHvOQFaDuFiYVyS3LvXU4=
 github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE=
 github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk=
 github.com/go-logfmt/logfmt v0.5.0/go.mod h1:wCYkCAKZfumFQihp8CzCvQ3paCTfi41vtzG1KdI/P7A=
@@ -216,7 +203,6 @@ github.com/go-redis/redis/extra/redisotel v0.3.0 h1:8rrizwFAUUeMgmelyiQi9KeFwmpQ
 github.com/go-redis/redis/extra/redisotel v0.3.0/go.mod h1:sGV3dQnPMBUuqzowEP2nZPhLXCMeh83nY64yaju249c=
 github.com/go-redis/redis/v8 v8.3.2/go.mod h1:jszGxBCez8QA1HWSmQxJO9Y82kNibbUmeYhKWrBejTU=
 github.com/go-redis/redis/v8 v8.5.0/go.mod h1:YmEcgBDttjnkbMzDAhDtQxY9yVA7jMN6PCR5HeMvqFE=
-github.com/go-redis/redis/v8 v8.9.0/go.mod h1:ik7vb7+gm8Izylxu6kf6wG26/t2VljgCfSQ1DM4O1uU=
 github.com/go-redis/redis/v8 v8.11.2 h1:WqlSpAwz8mxDSMCvbyz1Mkiqe0LE5OY4j3lgkvu1Ts0=
 github.com/go-redis/redis/v8 v8.11.2/go.mod h1:DLomh7y2e3ggQXQLd1YgmvIfecPJoFl7WU5SOQ/r06M=
 github.com/go-sql-driver/mysql v1.4.0/go.mod h1:zAC/RDZ24gD3HViQzih4MyKcchzm+sOG5ZlKdlhCg5w=
@@ -226,13 +212,11 @@ github.com/go-sql-driver/mysql v1.6.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LB
 github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
 github.com/go-zookeeper/zk v1.0.2 h1:4mx0EYENAdX/B/rbunjlt5+4RTA/a9SMHBRuSKdGxPM=
 github.com/go-zookeeper/zk v1.0.2/go.mod h1:nOB03cncLtlp4t+UAkGSV+9beXP/akpekBwL+UX1Qcw=
-github.com/godbus/dbus/v5 v5.0.3/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
 github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
 github.com/gogo/googleapis v1.1.0/go.mod h1:gf4bu3Q80BeJ6H1S1vYPm8/ELATdvryBaNFGgqEef3s=
 github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
 github.com/gogo/protobuf v1.2.0/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
 github.com/gogo/protobuf v1.2.1/go.mod h1:hp+jE20tsWTFYpLwKvXlhS1hjn+gTNwPg2I6zVXpSg4=
-github.com/gogo/protobuf v1.3.1/go.mod h1:SlYgWuQ5SjCEi6WLHjHCa1yvBfUnHcTbrrZtXPKa29o=
 github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q=
 github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q=
 github.com/goji/httpauth v0.0.0-20160601135302-2da839ab0f4d/go.mod h1:nnjvkQ9ptGaCkuDUx6wNykzzlUixGxvkme+H/lnzb+A=
@@ -303,7 +287,6 @@ github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm4
 github.com/google/subcommands v1.0.1/go.mod h1:ZjhPrFU+Olkh9WazFPsl27BQ4UPiG37m3yTrtFlrHVk=
 github.com/google/uuid v1.0.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/google/uuid v1.1.2/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
-github.com/google/uuid v1.2.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/google/uuid v1.3.0 h1:t6JiXgmwXMjEs8VusXIJk2BXHsn+wx8BZdTaoZ5fu7I=
 github.com/google/uuid v1.3.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/google/wire v0.5.0 h1:I7ELFeVBr3yfPIcc8+MWvrjk+3VjbcSzoXm3JVa+jD8=
@@ -327,7 +310,6 @@ github.com/grpc-ecosystem/go-grpc-middleware v1.0.1-0.20190118093823-f849b5445de
 github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0/go.mod h1:8NvIoxWQoOIhqOTXgfV/d3M/q6VIi02HzZEHgUlZvzk=
 github.com/grpc-ecosystem/grpc-gateway v1.9.0/go.mod h1:vNeuVxBJEsws4ogUvrchl83t/GYV9WGTSLVdBhOQFDY=
 github.com/grpc-ecosystem/grpc-gateway v1.9.5/go.mod h1:vNeuVxBJEsws4ogUvrchl83t/GYV9WGTSLVdBhOQFDY=
-github.com/grpc-ecosystem/grpc-gateway v1.14.6/go.mod h1:zdiPV4Yse/1gnckTHtghG4GkDEdKCRJduHpTxT3/jcw=
 github.com/grpc-ecosystem/grpc-gateway v1.16.0 h1:gmcG1KaJ57LophUzW0Hy8NmPhnMZb4M0+kPpLofRdBo=
 github.com/grpc-ecosystem/grpc-gateway v1.16.0/go.mod h1:BDjrQk3hbvj6Nolgz8mAMFbcEtjT1g+wF4CSlocrBnw=
 github.com/grpc-ecosystem/grpc-gateway/v2 v2.5.0 h1:ajue7SzQMywqRjg2fK7dcpc0QhFGpTR2plWfV4EZWR4=
@@ -435,7 +417,6 @@ github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
-github.com/labstack/echo/v4 v4.3.0/go.mod h1:PvmtTvhVqKDzDQy4d3bWzPjZLzom4iQbAZy2sgZ/qI8=
 github.com/labstack/echo/v4 v4.5.0 h1:JXk6H5PAw9I3GwizqUHhYyS4f45iyGebR/c1xNCeOCY=
 github.com/labstack/echo/v4 v4.5.0/go.mod h1:czIriw4a0C1dFun+ObrXp7ok03xON0N1awStJ6ArI7Y=
 github.com/labstack/gommon v0.3.0 h1:JEeO0bvc78PKdyHxloTKiF8BD5iGrH8T6MSeGvSgob0=
@@ -449,11 +430,9 @@ github.com/lestrrat/go-file-rotatelogs v0.0.0-20180223000712-d3151e2a480f h1:sgU
 github.com/lestrrat/go-file-rotatelogs v0.0.0-20180223000712-d3151e2a480f/go.mod h1:UGmTpUd3rjbtfIpwAPrcfmGf/Z1HS95TATB+m57TPB8=
 github.com/lestrrat/go-strftime v0.0.0-20180220042222-ba3bf9c1d042 h1:Bvq8AziQ5jFF4BHGAEDSqwPW1NJS3XshxbRCxtjFAZc=
 github.com/lestrrat/go-strftime v0.0.0-20180220042222-ba3bf9c1d042/go.mod h1:TPpsiPUEh0zFL1Snz4crhMlBe60PYxRHr5oFF3rRYg0=
-github.com/lib/pq v1.10.0/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=
 github.com/lib/pq v1.10.2/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=
 github.com/lightstep/lightstep-tracer-common/golang/gogo v0.0.0-20190605223551-bc2310a04743/go.mod h1:qklhhLq1aX+mtWk9cPHPzaBjWImj5ULL6C7HFJtXQMM=
 github.com/lightstep/lightstep-tracer-go v0.18.1/go.mod h1:jlF1pusYV4pidLvZ+XD0UBX0ZE6WURAspgAczcDHrL4=
-github.com/longXboy/grpc-gateway/v2 v2.0.0-20210707031540-bd2d73d86cee/go.mod h1:upmbHHZp+gtRNfSk94XgTH+14LqZxzmvgnrp9KEMKRg=
 github.com/lyft/protoc-gen-star v0.5.1/go.mod h1:9toiA3cC7z5uVbODF7kEQ91Xn7XNFkVUl+SrEe+ZORU=
 github.com/lyft/protoc-gen-validate v0.0.13/go.mod h1:XbGvPuh87YZc5TdIa2/I4pLk0QoUACkjt2znoq26NVQ=
 github.com/magiconair/properties v1.8.1/go.mod h1:PppfXfuXeibc/6YijjN8zIbojt8czPbwD3XqdrwzmxQ=
@@ -474,7 +453,6 @@ github.com/mattn/go-isatty v0.0.13 h1:qdl+GuBjcsKKDco5BsxPJlId98mSWNKqYA+Co0SC1y
 github.com/mattn/go-isatty v0.0.13/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
 github.com/mattn/go-runewidth v0.0.2/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=
 github.com/mattn/go-runewidth v0.0.9/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
-github.com/mattn/go-sqlite3 v1.14.6/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A/KQRfk6bU=
 github.com/mattn/go-sqlite3 v1.14.8/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A/KQRfk6bU=
 github.com/matttproud/golang_protobuf_extensions v1.0.1 h1:4hp9jkHxhMHkqkrB3Ix0jegS5sx/RkqARlsWZ6pIwiU=
 github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
@@ -503,7 +481,6 @@ github.com/modern-go/reflect2 v1.0.1 h1:9f412s+6RmYXLWZSEzVVgPGK7C2PphHj5RJrvfx9
 github.com/modern-go/reflect2 v1.0.1/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
 github.com/mwitkow/go-conntrack v0.0.0-20161129095857-cc309e4a2223/go.mod h1:qRWi+5nqEBWmkhHvq77mSJWrCKwh8bxhgT7d/eI7P4U=
 github.com/mwitkow/go-conntrack v0.0.0-20190716064945-2f068394615f/go.mod h1:qRWi+5nqEBWmkhHvq77mSJWrCKwh8bxhgT7d/eI7P4U=
-github.com/nacos-group/nacos-sdk-go v1.0.7/go.mod h1:hlAPn3UdzlxIlSILAyOXKxjFSvDJ9oLzTJ9hLAK1KzA=
 github.com/nacos-group/nacos-sdk-go v1.0.8 h1:8pEm05Cdav9sQgJSv5kyvlgfz0SzFUUGI3pWX6SiSnM=
 github.com/nacos-group/nacos-sdk-go v1.0.8/go.mod h1:hlAPn3UdzlxIlSILAyOXKxjFSvDJ9oLzTJ9hLAK1KzA=
 github.com/nats-io/jwt v0.3.0/go.mod h1:fRYCDE99xlTsqUzISS1Bi75UBJ6ljOJQOAAu5VglpSg=
@@ -570,7 +547,6 @@ github.com/prometheus/client_golang v0.9.3/go.mod h1:/TN21ttK/J9q6uSwhBd54HahCDf
 github.com/prometheus/client_golang v1.0.0/go.mod h1:db9x61etRT2tGnBNRi70OPL5FsnadC4Ky3P0J6CfImo=
 github.com/prometheus/client_golang v1.3.0/go.mod h1:hJaj2vgQTGQmVCsAACORcieXFeDPbaTKGT+JTgUa3og=
 github.com/prometheus/client_golang v1.4.0/go.mod h1:e9GMxYsXl05ICDXkRhurwBS4Q3OK1iX/F2sw+iXX5zU=
-github.com/prometheus/client_golang v1.5.1/go.mod h1:e9GMxYsXl05ICDXkRhurwBS4Q3OK1iX/F2sw+iXX5zU=
 github.com/prometheus/client_golang v1.7.1/go.mod h1:PY5Wy2awLA44sXw4AOSfFBetzPP4j5+D6mVACh+pe2M=
 github.com/prometheus/client_golang v1.9.0/go.mod h1:FqZLKOZnGdFAhOK4nqGHa7D66IdsO+O441Eve7ptJDU=
 github.com/prometheus/client_golang v1.11.0 h1:HNkLOAEQMIDv/K+04rukrLx6ch7msSRwf3/SASFAGtQ=
@@ -690,21 +666,15 @@ go.etcd.io/bbolt v1.3.2/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
 go.etcd.io/bbolt v1.3.3/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
 go.etcd.io/etcd v0.0.0-20191023171146-3cf2f69b5738 h1:VcrIfasaLFkyjk6KNlXQSzO+B0fZcnECiDrKJsfxka0=
 go.etcd.io/etcd v0.0.0-20191023171146-3cf2f69b5738/go.mod h1:dnLIgRNXwCJa5e+c6mIZCrds/GIG4ncV9HhK5PX7jPg=
-go.etcd.io/etcd/api/v3 v3.5.0-alpha.0/go.mod h1:mPcW6aZJukV6Aa81LSKpBjQXTWlXB5r74ymPoSWa3Sw=
-go.etcd.io/etcd/api/v3 v3.5.0-beta.4/go.mod h1:yF0YUmBghT48aC0/eTFrhULo+uKQAr5spQQ6sRhPauE=
 go.etcd.io/etcd/api/v3 v3.5.0-rc.1/go.mod h1:cbVKeC6lCfl7j/8jBhAK6aIYO9XOjdptoxU/nLQcPvs=
 go.etcd.io/etcd/api/v3 v3.5.0 h1:GsV3S+OfZEOCNXdtNkBSR7kgLobAa/SO6tCxRa0GAYw=
 go.etcd.io/etcd/api/v3 v3.5.0/go.mod h1:cbVKeC6lCfl7j/8jBhAK6aIYO9XOjdptoxU/nLQcPvs=
-go.etcd.io/etcd/client/pkg/v3 v3.5.0-beta.4/go.mod h1:a+pbz+UrcOpvve1Qxf6tGovi15PjgtRhi0QTO2Nlc4U=
 go.etcd.io/etcd/client/pkg/v3 v3.5.0-rc.1/go.mod h1:IJHfcCEKxYu1Os13ZdwCwIUTUVGYTSAM3YSwc9/Ac1g=
 go.etcd.io/etcd/client/pkg/v3 v3.5.0 h1:2aQv6F436YnN7I4VbI8PPYrBhu+SmrTaADcf8Mi/6PU=
 go.etcd.io/etcd/client/pkg/v3 v3.5.0/go.mod h1:IJHfcCEKxYu1Os13ZdwCwIUTUVGYTSAM3YSwc9/Ac1g=
-go.etcd.io/etcd/client/v3 v3.5.0-alpha.0/go.mod h1:wKt7jgDgf/OfKiYmCq5WFGxOFAkVMLxiiXgLDFhECr8=
-go.etcd.io/etcd/client/v3 v3.5.0-beta.4/go.mod h1:0L1RulN1QSXq6uKPMUSX+OTAYyFkapMK7iUHXXIH/1E=
 go.etcd.io/etcd/client/v3 v3.5.0-rc.1/go.mod h1:2N1F3ShRL8f2OhE5R4JvjHicW6XDgYMZMH9JES76bOQ=
 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.etcd.io/etcd/pkg/v3 v3.5.0-alpha.0/go.mod h1:tV31atvwzcybuqejDoY3oaNRTtlD2l/Ot78Pc9w7DMY=
 go.opencensus.io v0.20.1/go.mod h1:6WKK9ahsWS3RSO+PY9ZHZUfv2irvY6gN279GOPZjmmk=
 go.opencensus.io v0.20.2/go.mod h1:6WKK9ahsWS3RSO+PY9ZHZUfv2irvY6gN279GOPZjmmk=
 go.opencensus.io v0.21.0/go.mod h1:mSImk1erAIZhrmZN+AvHh14ztQfjbGwt4TtuofqLduU=
@@ -716,26 +686,15 @@ go.opencensus.io v0.23.0/go.mod h1:XItmlyltB5F7CS4xOC1DcqMoFqwtC6OG2xF7mCv7P7E=
 go.opentelemetry.io/otel v0.13.0/go.mod h1:dlSNewoRYikTkotEnxdmuBHgzT+k/idJSfDv/FxEnOY=
 go.opentelemetry.io/otel v0.16.0/go.mod h1:e4GKElweB8W2gWUqbghw0B8t5MCTccc9212eNHnOHwA=
 go.opentelemetry.io/otel v0.17.0/go.mod h1:Oqtdxmf7UtEvL037ohlgnaYa1h7GtMh0NcSd9eqkC9s=
-go.opentelemetry.io/otel v0.20.0/go.mod h1:Y3ugLH2oa81t5QO+Lty+zXf8zC9L26ax4Nzoxm/dooo=
-go.opentelemetry.io/otel v1.0.0-RC1/go.mod h1:x9tRa9HK4hSSq7jf2TKbqFbtt58/TGk0f9XiEYISI1I=
 go.opentelemetry.io/otel v1.0.0-RC2 h1:SHhxSjB+omnGZPgGlKe+QMp3MyazcOHdQ8qwo89oKbg=
 go.opentelemetry.io/otel v1.0.0-RC2/go.mod h1:w1thVQ7qbAy8MHb0IFj8a5Q2QU0l2ksf8u/CN8m3NOM=
-go.opentelemetry.io/otel/exporters/jaeger v1.0.0-RC1/go.mod h1:FXJnjGCoTQL6nQ8OpFJ0JI1DrdOvMoVx49ic0Hg4+D4=
 go.opentelemetry.io/otel/exporters/jaeger v1.0.0-RC2 h1:RF0nWsIDpDBe+s06lkLxUw9CWQUAhO6hBSxxB7dz45s=
 go.opentelemetry.io/otel/exporters/jaeger v1.0.0-RC2/go.mod h1:sZZqN3Vb0iT+NE6mZ1S7sNyH3t4PFk6ElK5TLGFBZ7E=
-go.opentelemetry.io/otel/internal/metric v0.21.0/go.mod h1:iOfAaY2YycsXfYD4kaRSbLx2LKmfpKObWBEv9QK5zFo=
 go.opentelemetry.io/otel/metric v0.17.0/go.mod h1:hUz9lH1rNXyEwWAhIWCMFWKhYtpASgSnObJFnU26dJ0=
-go.opentelemetry.io/otel/metric v0.20.0/go.mod h1:598I5tYlH1vzBjn+BTuhzTCSb/9debfNp6R3s7Pr1eU=
-go.opentelemetry.io/otel/metric v0.21.0/go.mod h1:JWCt1bjivC4iCrz/aCrM1GSw+ZcvY44KCbaeeRhzHnc=
 go.opentelemetry.io/otel/oteltest v0.17.0/go.mod h1:JT/LGFxPwpN+nlsTiinSYjdIx3hZIGqHCpChcIZmdoE=
-go.opentelemetry.io/otel/oteltest v0.20.0/go.mod h1:L7bgKf9ZB7qCwT9Up7i9/pn0PWIa9FqQ2IQ8LoxiGnw=
-go.opentelemetry.io/otel/oteltest v1.0.0-RC1/go.mod h1:+eoIG0gdEOaPNftuy1YScLr1Gb4mL/9lpDkZ0JjMRq4=
-go.opentelemetry.io/otel/sdk v1.0.0-RC1/go.mod h1:kj6yPn7Pgt5ByRuwesbaWcRLA+V7BSDg3Hf8xRvsvf8=
 go.opentelemetry.io/otel/sdk v1.0.0-RC2 h1:ROuteeSCBaZNjiT9JcFzZepmInDvLktR28Y6qKo8bCs=
 go.opentelemetry.io/otel/sdk v1.0.0-RC2/go.mod h1:fgwHyiDn4e5k40TD9VX243rOxXR+jzsWBZYA2P5jpEw=
 go.opentelemetry.io/otel/trace v0.17.0/go.mod h1:bIujpqg6ZL6xUTubIUgziI1jSaUPthmabA/ygf/6Cfg=
-go.opentelemetry.io/otel/trace v0.20.0/go.mod h1:6GjCW8zgDjwGHGa6GkyeB8+/5vjT16gUEi0Nf1iBdgw=
-go.opentelemetry.io/otel/trace v1.0.0-RC1/go.mod h1:86UHmyHWFEtWjfWPSbu0+d0Pf9Q6e1U+3ViBOc+NXAg=
 go.opentelemetry.io/otel/trace v1.0.0-RC2 h1:dunAP0qDULMIT82atj34m5RgvsIK6LcsXf1c/MsYg1w=
 go.opentelemetry.io/otel/trace v1.0.0-RC2/go.mod h1:JPQ+z6nNw9mqEGT8o3eoPTdnNI+Aj5JcxEsVGREIAy4=
 go.opentelemetry.io/proto/otlp v0.7.0/go.mod h1:PqfVotwruBrMGOCsRd/89rSnXhoiJIqeYNgFYFoEGnI=
@@ -758,10 +717,7 @@ go.uber.org/tools v0.0.0-20190618225709-2cfd321de3ee/go.mod h1:vJERXedbb3MVM5f9E
 go.uber.org/zap v1.10.0/go.mod h1:vwi/ZaCAaUcBkycHslxD9B2zi4UTXhF60s6SWpuDF0Q=
 go.uber.org/zap v1.13.0/go.mod h1:zwrFLgMcdUuIBviXEYEH1YKNaOBnKXsx2IPda5bBwHM=
 go.uber.org/zap v1.15.0/go.mod h1:Mb2vm2krFEG5DV0W9qcHBYFtp/Wku1cvYaqPsS/WYfc=
-go.uber.org/zap v1.16.0/go.mod h1:MA8QOfq0BHJwdXa996Y4dYkAqRKB8/1K1QMMZVaNZjQ=
-go.uber.org/zap v1.16.1-0.20210329175301-c23abee72d19/go.mod h1:aMfIlz3TDBfB0BwTCKFU1XbEmj9zevr5S5LcBr85MXw=
 go.uber.org/zap v1.17.0/go.mod h1:MXVU+bhUf/A7Xi2HNOnopQOrmycQ5Ih87HtOu4q5SSo=
-go.uber.org/zap v1.18.1/go.mod h1:xg/QME4nWcxGxrpdeYfq7UvYrLh66cuVKdrbD1XF/NI=
 go.uber.org/zap v1.19.0 h1:mZQZefskPPCMIBCSEH0v2/iUqqLrYtaeqwD6FUGUnFE=
 go.uber.org/zap v1.19.0/go.mod h1:xg/QME4nWcxGxrpdeYfq7UvYrLh66cuVKdrbD1XF/NI=
 golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
@@ -832,7 +788,6 @@ golang.org/x/net v0.0.0-20190628185345-da137c7871d7/go.mod h1:z5CRVTTTmAJ677TzLL
 golang.org/x/net v0.0.0-20190724013045-ca1201d0de80/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20190813141303-74dc4d7220e7/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20190923162816-aa69164e4478/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20191002035440-2ec189313ef0/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20191209160850-c0dbc17a3553/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20200114155413-6afb5195e5aa/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20200202094626-16171245cfb2/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
@@ -863,7 +818,6 @@ golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45/go.mod h1:gOpvHmFTYa4Iltr
 golang.org/x/oauth2 v0.0.0-20191202225959-858c2ad4c8b6/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20210615190721-d04028783cf1/go.mod h1:KelEdhl1UZF7XfJ4dDtk6s++YSgaE7mD/BuKKDLBl4A=
-golang.org/x/oauth2 v0.0.0-20210628180205-a41e5a781914/go.mod h1:KelEdhl1UZF7XfJ4dDtk6s++YSgaE7mD/BuKKDLBl4A=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
@@ -927,11 +881,9 @@ golang.org/x/sys v0.0.0-20200615200032-f1bc736245b1/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200625212154-ddb9806d33ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200803210538-64077c9b5642/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20201009025420-dfb3f7c4e634/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201214210602-f9fddec55a1e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210112080510-489259a85091/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210320140829-1e4c9ba3b0c4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -1013,7 +965,6 @@ golang.org/x/tools v0.0.0-20200804011535-6c149bb5ef0d/go.mod h1:njjCfa9FT2d7l9Bc
 golang.org/x/tools v0.0.0-20200825202427-b303f430e36d/go.mod h1:njjCfa9FT2d7l9Bc6FUM5FLjQPp3cFF28FI3qnDFljA=
 golang.org/x/tools v0.0.0-20201224043029-2b0845dc783e/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
 golang.org/x/tools v0.0.0-20210106214847-113979e3529a/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
-golang.org/x/tools v0.1.0/go.mod h1:xkSsbof2nBLbhDlRMhhhyNLN/zl3eTqcnHD5viDpcZ0=
 golang.org/x/tools v0.1.2/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
 golang.org/x/tools v0.1.3/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
 golang.org/x/tools v0.1.4/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
@@ -1102,15 +1053,14 @@ google.golang.org/grpc v1.28.0/go.mod h1:rpkK4SK4GF4Ach/+MFLZUBavHOvF2JJB5uozKKa
 google.golang.org/grpc v1.29.1/go.mod h1:itym6AZVZYACWQqET3MqgPpjcuV5QH3BxFS3IjizoKk=
 google.golang.org/grpc v1.30.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
 google.golang.org/grpc v1.31.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
-google.golang.org/grpc v1.32.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
 google.golang.org/grpc v1.33.1/go.mod h1:fr5YgcSWrqhRRxogOsw7RzIpsmvOZ6IcH4kBYTpR3n0=
 google.golang.org/grpc v1.33.2/go.mod h1:JMHMWHQWaTccqQQlmk3MJZS+GWXOdAesneDmEnv2fbc=
 google.golang.org/grpc v1.36.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
-google.golang.org/grpc v1.37.0/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
 google.golang.org/grpc v1.38.0/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
 google.golang.org/grpc v1.39.0/go.mod h1:PImNr+rS9TWYb2O4/emRugxiyHZ5JyHW5F+RPnDzfrE=
-google.golang.org/grpc v1.39.1 h1:f37vZbBVTiJ6jKG5mWz8ySOBxNqy6ViPgyhSdVnxF3E=
 google.golang.org/grpc v1.39.1/go.mod h1:PImNr+rS9TWYb2O4/emRugxiyHZ5JyHW5F+RPnDzfrE=
+google.golang.org/grpc v1.40.0 h1:AGJ0Ih4mHjSeibYkFGh1dD9KJ/eOtZ93I6hoHhukQ5Q=
+google.golang.org/grpc v1.40.0/go.mod h1:ogyxbiOoUXAkP+4+xa6PZSE9DZgIHtSpzjDTB9KAK34=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=

examples/registry/consul/client/main.go

@@ -5,8 +5,8 @@ import (
 	"log"
 	"time"
 
-	"github.com/go-kratos/consul/registry"
 	"github.com/go-kratos/kratos/examples/helloworld/helloworld"
+	"github.com/go-kratos/kratos/registry/consul/v2"
 	"github.com/go-kratos/kratos/v2/middleware/recovery"
 	"github.com/go-kratos/kratos/v2/transport/grpc"
 	"github.com/go-kratos/kratos/v2/transport/http"

examples/registry/consul/server/main.go

@@ -5,8 +5,8 @@ import (
 	"fmt"
 	"log"
 
-	"github.com/go-kratos/consul/registry"
 	"github.com/go-kratos/kratos/examples/helloworld/helloworld"
+	"github.com/go-kratos/kratos/registry/consul/v2"
 	"github.com/go-kratos/kratos/v2"
 	"github.com/go-kratos/kratos/v2/middleware/recovery"
 	"github.com/go-kratos/kratos/v2/transport/grpc"

examples/registry/etcd/client/main.go

@@ -5,8 +5,8 @@ import (
 	"log"
 	"time"
 
-	"github.com/go-kratos/etcd/registry"
 	"github.com/go-kratos/kratos/examples/helloworld/helloworld"
+	"github.com/go-kratos/kratos/registry/etcd/v2"
 	"github.com/go-kratos/kratos/v2/transport/grpc"
 	"github.com/go-kratos/kratos/v2/transport/http"
 	clientv3 "go.etcd.io/etcd/client/v3"

examples/registry/etcd/server/main.go

@@ -5,8 +5,8 @@ import (
 	"fmt"
 	"log"
 
-	"github.com/go-kratos/etcd/registry"
 	pb "github.com/go-kratos/kratos/examples/helloworld/helloworld"
+	"github.com/go-kratos/kratos/registry/etcd/v2"
 	"github.com/go-kratos/kratos/v2"
 	"github.com/go-kratos/kratos/v2/middleware/recovery"
 	"github.com/go-kratos/kratos/v2/transport/grpc"

examples/registry/nacos/client/main.go

@@ -5,8 +5,8 @@ import (
 	"log"
 
 	"github.com/go-kratos/kratos/examples/helloworld/helloworld"
+	"github.com/go-kratos/kratos/registry/nacos/v2"
 	"github.com/go-kratos/kratos/v2/transport/grpc"
-	"github.com/go-kratos/nacos/registry"
 	"github.com/nacos-group/nacos-sdk-go/clients"
 	"github.com/nacos-group/nacos-sdk-go/common/constant"
 	"github.com/nacos-group/nacos-sdk-go/vo"

examples/registry/nacos/server/main.go

@@ -6,11 +6,11 @@ import (
 	"log"
 
 	pb "github.com/go-kratos/kratos/examples/helloworld/helloworld"
+	"github.com/go-kratos/kratos/registry/nacos/v2"
 	"github.com/go-kratos/kratos/v2"
 	"github.com/go-kratos/kratos/v2/middleware/recovery"
 	"github.com/go-kratos/kratos/v2/transport/grpc"
 	"github.com/go-kratos/kratos/v2/transport/http"
-	"github.com/go-kratos/nacos/registry"
 	"github.com/nacos-group/nacos-sdk-go/clients"
 	"github.com/nacos-group/nacos-sdk-go/common/constant"
 	"github.com/nacos-group/nacos-sdk-go/vo"

examples/registry/zookeeper/client/main.go

@@ -6,9 +6,9 @@ import (
 	"time"
 
 	"github.com/go-kratos/kratos/examples/helloworld/helloworld"
+	"github.com/go-kratos/kratos/registry/zookeeper/v2"
 	"github.com/go-kratos/kratos/v2/transport/grpc"
 	"github.com/go-kratos/kratos/v2/transport/http"
-	"github.com/go-kratos/zookeeper/registry"
 )
 
 func main() {

examples/registry/zookeeper/server/main.go

@@ -6,11 +6,11 @@ import (
 	"log"
 
 	"github.com/go-kratos/kratos/examples/helloworld/helloworld"
+	"github.com/go-kratos/kratos/registry/zookeeper/v2"
 	"github.com/go-kratos/kratos/v2"
 	"github.com/go-kratos/kratos/v2/middleware/recovery"
 	"github.com/go-kratos/kratos/v2/transport/grpc"
 	"github.com/go-kratos/kratos/v2/transport/http"
-	"github.com/go-kratos/zookeeper/registry"
 )
 
 // server is used to implement helloworld.GreeterServer.

registry/consul/client.go

@@ -0,0 +1,127 @@
+package registry
+
+import (
+	"context"
+	"fmt"
+	"net/url"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/go-kratos/kratos/v2/registry"
+	"github.com/hashicorp/consul/api"
+)
+
+// Client is consul client config
+type Client struct {
+	cli    *api.Client
+	ctx    context.Context
+	cancel context.CancelFunc
+}
+
+// NewClient creates consul client
+func NewClient(cli *api.Client) *Client {
+	c := &Client{cli: cli}
+	c.ctx, c.cancel = context.WithCancel(context.Background())
+	return c
+}
+
+// Service get services from consul
+func (d *Client) Service(ctx context.Context, service string, index uint64, passingOnly bool) ([]*registry.ServiceInstance, uint64, error) {
+	opts := &api.QueryOptions{
+		WaitIndex: index,
+		WaitTime:  time.Second * 55,
+	}
+	opts = opts.WithContext(ctx)
+	entries, meta, err := d.cli.Health().Service(service, "", passingOnly, opts)
+	if err != nil {
+		return nil, 0, err
+	}
+	var services []*registry.ServiceInstance
+	for _, entry := range entries {
+		var version string
+		for _, tag := range entry.Service.Tags {
+			strs := strings.SplitN(tag, "=", 2)
+			if len(strs) == 2 && strs[0] == "version" {
+				version = strs[1]
+			}
+		}
+		var endpoints []string
+		for scheme, addr := range entry.Service.TaggedAddresses {
+			if scheme == "lan_ipv4" || scheme == "wan_ipv4" || scheme == "lan_ipv6" || scheme == "wan_ipv6" {
+				continue
+			}
+			endpoints = append(endpoints, addr.Address)
+		}
+		services = append(services, &registry.ServiceInstance{
+			ID:        entry.Service.ID,
+			Name:      entry.Service.Service,
+			Metadata:  entry.Service.Meta,
+			Version:   version,
+			Endpoints: endpoints,
+		})
+	}
+	return services, meta.LastIndex, nil
+}
+
+// Register register service instacen to consul
+func (d *Client) Register(ctx context.Context, svc *registry.ServiceInstance, enableHealthCheck bool) error {
+	addresses := make(map[string]api.ServiceAddress)
+	var addr string
+	var port uint64
+	for _, endpoint := range svc.Endpoints {
+		raw, err := url.Parse(endpoint)
+		if err != nil {
+			return err
+		}
+		addr = raw.Hostname()
+		port, _ = strconv.ParseUint(raw.Port(), 10, 16)
+		addresses[raw.Scheme] = api.ServiceAddress{Address: endpoint, Port: int(port)}
+	}
+	asr := &api.AgentServiceRegistration{
+		ID:              svc.ID,
+		Name:            svc.Name,
+		Meta:            svc.Metadata,
+		Tags:            []string{fmt.Sprintf("version=%s", svc.Version)},
+		TaggedAddresses: addresses,
+		Address:         addr,
+		Port:            int(port),
+		Checks: []*api.AgentServiceCheck{
+			{
+				CheckID: "service:" + svc.ID,
+				TTL:     "50s",
+				Status:  "passing",
+			},
+		},
+	}
+	if enableHealthCheck {
+		asr.Checks = append(asr.Checks, &api.AgentServiceCheck{
+			TCP:      fmt.Sprintf("%s:%d", addr, port),
+			Interval: "20s",
+			Status:   "passing",
+		})
+	}
+	err := d.cli.Agent().ServiceRegister(asr)
+	if err != nil {
+		return err
+	}
+	go func() {
+		ticker := time.NewTicker(time.Second * 20)
+		defer ticker.Stop()
+		for {
+			select {
+			case <-ticker.C:
+				d.cli.Agent().UpdateTTL("service:"+svc.ID, "pass", "pass")
+			case <-d.ctx.Done():
+				return
+			}
+		}
+	}()
+	return nil
+}
+
+// Deregister deregister service by service ID
+func (d *Client) Deregister(ctx context.Context, serviceID string) error {
+	d.cancel()
+	return d.cli.Agent().ServiceDeregister(serviceID)
+}

registry/consul/go.mod

@@ -0,0 +1,12 @@
+module github.com/go-kratos/kratos/registry/consul/v2
+
+go 1.16
+
+require (
+	github.com/go-kratos/kratos/v2 v2.0.5
+	github.com/hashicorp/consul/api v1.9.1
+	github.com/stretchr/testify v1.7.0
+)
+
+replace github.com/go-kratos/kratos/v2 => ../../../kratos
+

registry/consul/go.sum

@@ -0,0 +1,260 @@
+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=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
+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 h1:8GUt8eRujhVEGZFFEjBj46YV4rDjvGrNxb0KMWYkL2I=
+github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
+github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
+github.com/armon/go-radix v1.0.0/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
+github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
+github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
+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/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
+github.com/cncf/xds/go v0.0.0-20210312221358-fbca930ec8ed/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
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+github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
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+github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
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+github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
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registry/consul/registry.go

@@ -0,0 +1,164 @@
+package registry
+
+import (
+	"context"
+	"fmt"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"github.com/go-kratos/kratos/v2/registry"
+	"github.com/hashicorp/consul/api"
+)
+
+var (
+	_ registry.Registrar = &Registry{}
+	_ registry.Discovery = &Registry{}
+)
+
+// Option is consul registry option.
+type Option func(*Registry)
+
+// WithHealthCheck with registry health check option.
+func WithHealthCheck(enable bool) Option {
+	return func(o *Registry) {
+		o.enableHealthCheck = enable
+	}
+}
+
+// Config is consul registry config
+type Config struct {
+	*api.Config
+}
+
+// Registry is consul registry
+type Registry struct {
+	cfg               *Config
+	cli               *Client
+	enableHealthCheck bool
+
+	registry map[string]*serviceSet
+	lock     sync.RWMutex
+}
+
+// New creates consul registry
+func New(apiClient *api.Client, opts ...Option) *Registry {
+	r := &Registry{
+		cli:               NewClient(apiClient),
+		registry:          make(map[string]*serviceSet),
+		enableHealthCheck: true,
+	}
+	for _, o := range opts {
+		o(r)
+	}
+	return r
+}
+
+// Register register service
+func (r *Registry) Register(ctx context.Context, svc *registry.ServiceInstance) error {
+	return r.cli.Register(ctx, svc, r.enableHealthCheck)
+}
+
+// Deregister deregister service
+func (r *Registry) Deregister(ctx context.Context, svc *registry.ServiceInstance) error {
+	return r.cli.Deregister(ctx, svc.ID)
+}
+
+// GetService return service by name
+func (r *Registry) GetService(ctx context.Context, name string) (services []*registry.ServiceInstance, err error) {
+	r.lock.RLock()
+	defer r.lock.RUnlock()
+	set := r.registry[name]
+	if set == nil {
+		return nil, fmt.Errorf("service %s not resolved in registry", name)
+	}
+	ss, _ := set.services.Load().([]*registry.ServiceInstance)
+	if ss == nil {
+		return nil, fmt.Errorf("service %s not found in registry", name)
+	}
+	for _, s := range ss {
+		services = append(services, s)
+	}
+	return
+}
+
+// ListServices return service list.
+func (r *Registry) ListServices() (allServices map[string][]*registry.ServiceInstance, err error) {
+	r.lock.RLock()
+	defer r.lock.RUnlock()
+	allServices = make(map[string][]*registry.ServiceInstance)
+	for name, set := range r.registry {
+		var services []*registry.ServiceInstance
+		ss, _ := set.services.Load().([]*registry.ServiceInstance)
+		if ss == nil {
+			continue
+		}
+		for _, s := range ss {
+			services = append(services, s)
+		}
+		allServices[name] = services
+	}
+	return
+}
+
+// Watch resolve service by name
+func (r *Registry) Watch(ctx context.Context, name string) (registry.Watcher, error) {
+	r.lock.Lock()
+	defer r.lock.Unlock()
+	set, ok := r.registry[name]
+	if !ok {
+		set = &serviceSet{
+			watcher:     make(map[*watcher]struct{}, 0),
+			services:    &atomic.Value{},
+			serviceName: name,
+		}
+		r.registry[name] = set
+	}
+
+	// 初始化watcher
+	w := &watcher{
+		event: make(chan struct{}, 1),
+	}
+	w.ctx, w.cancel = context.WithCancel(context.Background())
+	w.set = set
+	set.lock.Lock()
+	set.watcher[w] = struct{}{}
+	set.lock.Unlock()
+	ss, _ := set.services.Load().([]*registry.ServiceInstance)
+	if len(ss) > 0 {
+		// If the service has a value, it needs to be pushed to the watcher,
+		// otherwise the initial data may be blocked forever during the watch.
+		w.event <- struct{}{}
+	}
+
+	if !ok {
+		go r.resolve(set)
+	}
+	return w, nil
+}
+
+func (r *Registry) resolve(ss *serviceSet) {
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
+	services, idx, err := r.cli.Service(ctx, ss.serviceName, 0, true)
+	cancel()
+	if err == nil && len(services) > 0 {
+		ss.broadcast(services)
+	}
+	ticker := time.NewTicker(time.Second)
+	defer ticker.Stop()
+	for {
+		<-ticker.C
+		ctx, cancel := context.WithTimeout(context.Background(), time.Second*120)
+		tmpService, tmpIdx, err := r.cli.Service(ctx, ss.serviceName, idx, true)
+		cancel()
+		if err != nil {
+			time.Sleep(time.Second)
+			continue
+		}
+		if len(tmpService) != 0 && tmpIdx != idx {
+			services = tmpService
+			ss.broadcast(services)
+		}
+		idx = tmpIdx
+	}
+}

registry/consul/registry_test.go

@@ -0,0 +1,82 @@
+package registry
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"strconv"
+	"testing"
+	"time"
+
+	"github.com/go-kratos/kratos/v2/registry"
+	"github.com/hashicorp/consul/api"
+	"github.com/stretchr/testify/assert"
+)
+
+func tcpServer(t *testing.T, lis net.Listener) {
+	for {
+		conn, err := lis.Accept()
+		if err != nil {
+			return
+		}
+		fmt.Println("get tcp")
+		conn.Close()
+	}
+}
+
+func TestRegister(t *testing.T) {
+	addr := fmt.Sprintf("%s:8081", getIntranetIP())
+	lis, err := net.Listen("tcp", addr)
+	if err != nil {
+		t.Errorf("listen tcp %s failed!", addr)
+		t.Fail()
+	}
+	defer lis.Close()
+	go tcpServer(t, lis)
+	time.Sleep(time.Millisecond * 100)
+	cli, err := api.NewClient(&api.Config{Address: "127.0.0.1:8500"})
+	if err != nil {
+		t.Fatalf("create consul client failed: %v", err)
+	}
+	r := New(cli)
+	assert.Nil(t, err)
+	version := strconv.FormatInt(time.Now().Unix(), 10)
+	svc := &registry.ServiceInstance{
+		ID:        "test2233",
+		Name:      "test-provider",
+		Version:   version,
+		Metadata:  map[string]string{"app": "kratos"},
+		Endpoints: []string{fmt.Sprintf("tcp://%s?isSecure=false", addr)},
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
+	defer cancel()
+	err = r.Deregister(ctx, svc)
+	assert.Nil(t, err)
+	err = r.Register(ctx, svc)
+	assert.Nil(t, err)
+	w, err := r.Watch(ctx, "test-provider")
+	assert.Nil(t, err)
+
+	services, err := w.Next()
+	assert.Nil(t, err)
+	assert.Equal(t, 1, len(services))
+	assert.EqualValues(t, "test2233", services[0].ID)
+	assert.EqualValues(t, "test-provider", services[0].Name)
+	assert.EqualValues(t, version, services[0].Version)
+}
+
+func getIntranetIP() string {
+	addrs, err := net.InterfaceAddrs()
+	if err != nil {
+		return "127.0.0.1"
+	}
+
+	for _, address := range addrs {
+		if ipnet, ok := address.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
+			if ipnet.IP.To4() != nil {
+				return ipnet.IP.String()
+			}
+		}
+	}
+	return "127.0.0.1"
+}

registry/consul/service.go

@@ -0,0 +1,27 @@
+package registry
+
+import (
+	"sync"
+	"sync/atomic"
+
+	"github.com/go-kratos/kratos/v2/registry"
+)
+
+type serviceSet struct {
+	serviceName string
+	watcher     map[*watcher]struct{}
+	services    *atomic.Value
+	lock        sync.RWMutex
+}
+
+func (s *serviceSet) broadcast(ss []*registry.ServiceInstance) {
+	s.services.Store(ss)
+	s.lock.RLock()
+	defer s.lock.RUnlock()
+	for k := range s.watcher {
+		select {
+		case k.event <- struct{}{}:
+		default:
+		}
+	}
+}

registry/consul/watcher.go

@@ -0,0 +1,39 @@
+package registry
+
+import (
+	"context"
+
+	"github.com/go-kratos/kratos/v2/registry"
+)
+
+type watcher struct {
+	event chan struct{}
+	set   *serviceSet
+
+	// for cancel
+	ctx    context.Context
+	cancel context.CancelFunc
+}
+
+func (w *watcher) Next() (services []*registry.ServiceInstance, err error) {
+	select {
+	case <-w.ctx.Done():
+		err = w.ctx.Err()
+	case <-w.event:
+	}
+	ss, ok := w.set.services.Load().([]*registry.ServiceInstance)
+	if ok {
+		for _, s := range ss {
+			services = append(services, s)
+		}
+	}
+	return
+}
+
+func (w *watcher) Stop() error {
+	w.cancel()
+	w.set.lock.Lock()
+	defer w.set.lock.Unlock()
+	delete(w.set.watcher, w)
+	return nil
+}

registry/etcd/go.mod

@@ -0,0 +1,11 @@
+module github.com/go-kratos/kratos/registry/etcd/v2
+
+go 1.16
+
+require (
+	github.com/go-kratos/kratos/v2 v2.0.5
+	go.etcd.io/etcd/client/v3 v3.5.0
+	google.golang.org/grpc v1.40.0
+)
+
+replace github.com/go-kratos/kratos/v2 => ../../../kratos

registry/etcd/go.sum

@@ -0,0 +1,297 @@
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registry/etcd/registry.go

@@ -0,0 +1,209 @@
+package registry
+
+import (
+	"context"
+	"fmt"
+	"math/rand"
+	"time"
+
+	"github.com/go-kratos/kratos/v2/registry"
+	clientv3 "go.etcd.io/etcd/client/v3"
+)
+
+var (
+	_ registry.Registrar = &Registry{}
+	_ registry.Discovery = &Registry{}
+)
+
+// Option is etcd registry option.
+type Option func(o *options)
+
+type options struct {
+	ctx       context.Context
+	namespace string
+	ttl       time.Duration
+	maxRetry  int
+}
+
+// Context with registry context.
+func Context(ctx context.Context) Option {
+	return func(o *options) { o.ctx = ctx }
+}
+
+// Namespace with registry namespace.
+func Namespace(ns string) Option {
+	return func(o *options) { o.namespace = ns }
+}
+
+// RegisterTTL with register ttl.
+func RegisterTTL(ttl time.Duration) Option {
+	return func(o *options) { o.ttl = ttl }
+}
+
+func MaxRetry(num int) Option {
+	return func(o *options) { o.maxRetry = num }
+}
+
+// Registry is etcd registry.
+type Registry struct {
+	opts   *options
+	client *clientv3.Client
+	kv     clientv3.KV
+	lease  clientv3.Lease
+}
+
+// New creates etcd registry
+func New(client *clientv3.Client, opts ...Option) (r *Registry) {
+	options := &options{
+		ctx:       context.Background(),
+		namespace: "/microservices",
+		ttl:       time.Second * 15,
+		maxRetry:  5,
+	}
+	for _, o := range opts {
+		o(options)
+	}
+	return &Registry{
+		opts:   options,
+		client: client,
+		kv:     clientv3.NewKV(client),
+	}
+}
+
+// Register the registration.
+func (r *Registry) Register(ctx context.Context, service *registry.ServiceInstance) error {
+	key := fmt.Sprintf("%s/%s/%s", r.opts.namespace, service.Name, service.ID)
+	value, err := marshal(service)
+	if err != nil {
+		return err
+	}
+	if r.lease != nil {
+		r.lease.Close()
+	}
+	r.lease = clientv3.NewLease(r.client)
+	leaseID, err := r.registerWithKV(ctx, key, value)
+	if err != nil {
+		return err
+	}
+
+	go r.heartBeat(r.opts.ctx, leaseID, key, value)
+	return nil
+}
+
+// Deregister the registration.
+func (r *Registry) Deregister(ctx context.Context, service *registry.ServiceInstance) error {
+	defer func() {
+		if r.lease != nil {
+			r.lease.Close()
+		}
+	}()
+	key := fmt.Sprintf("%s/%s/%s", r.opts.namespace, service.Name, service.ID)
+	_, err := r.client.Delete(ctx, key)
+	return err
+}
+
+// GetService return the service instances in memory according to the service name.
+func (r *Registry) GetService(ctx context.Context, name string) ([]*registry.ServiceInstance, error) {
+	key := fmt.Sprintf("%s/%s", r.opts.namespace, name)
+	resp, err := r.kv.Get(ctx, key, clientv3.WithPrefix())
+	if err != nil {
+		return nil, err
+	}
+	var items []*registry.ServiceInstance
+	for _, kv := range resp.Kvs {
+		si, err := unmarshal(kv.Value)
+		if err != nil {
+			return nil, err
+		}
+		items = append(items, si)
+	}
+	return items, nil
+}
+
+// Watch creates a watcher according to the service name.
+func (r *Registry) Watch(ctx context.Context, name string) (registry.Watcher, error) {
+	key := fmt.Sprintf("%s/%s", r.opts.namespace, name)
+	return newWatcher(ctx, key, r.client), nil
+}
+
+// registerWithKV create a new lease, return current leaseID
+func (r *Registry) registerWithKV(ctx context.Context, key string, value string) (clientv3.LeaseID, error) {
+	grant, err := r.lease.Grant(ctx, int64(r.opts.ttl.Seconds()))
+	if err != nil {
+		return 0, err
+	}
+	_, err = r.client.Put(ctx, key, value, clientv3.WithLease(grant.ID))
+	if err != nil {
+		return 0, err
+	}
+	return grant.ID, nil
+}
+
+func (r *Registry) heartBeat(ctx context.Context, leaseID clientv3.LeaseID, key string, value string) {
+	curLeaseID := leaseID
+	kac, err := r.client.KeepAlive(ctx, leaseID)
+	if err != nil {
+		curLeaseID = 0
+	}
+	rand.Seed(time.Now().Unix())
+
+	for {
+		if curLeaseID == 0 {
+			// try to registerWithKV
+			retreat := []int{}
+			for retryCnt := 0; retryCnt < r.opts.maxRetry; retryCnt++ {
+				if ctx.Err() != nil {
+					return
+				}
+				// prevent infinite blocking
+				idChan := make(chan clientv3.LeaseID, 1)
+				errChan := make(chan error, 1)
+				cancelCtx, cancel := context.WithCancel(ctx)
+				go func() {
+					defer cancel()
+					id, err := r.registerWithKV(cancelCtx, key, value)
+					if err != nil {
+						errChan <- err
+					} else {
+						idChan <- id
+					}
+				}()
+
+				select {
+				case <-time.After(3 * time.Second):
+					cancel()
+					continue
+				case <-errChan:
+					continue
+				case curLeaseID = <-idChan:
+				}
+
+				kac, err = r.client.KeepAlive(ctx, curLeaseID)
+				if err == nil {
+					break
+				}
+				retreat = append(retreat, 1<<retryCnt)
+				time.Sleep(time.Duration(retreat[rand.Intn(len(retreat))]) * time.Second)
+			}
+			if _, ok := <-kac; !ok {
+				// retry failed
+				return
+			}
+		}
+
+		select {
+		case _, ok := <-kac:
+			if !ok {
+				if ctx.Err() != nil {
+					// channel closed due to context cancel
+					return
+				}
+				// need to retry registration
+				curLeaseID = 0
+				continue
+			}
+		case <-r.opts.ctx.Done():
+			return
+		}
+	}
+}

registry/etcd/registry_test.go

@@ -0,0 +1,145 @@
+package registry
+
+import (
+	"context"
+	"fmt"
+	"google.golang.org/grpc"
+	"testing"
+	"time"
+
+	"github.com/go-kratos/kratos/v2/registry"
+	clientv3 "go.etcd.io/etcd/client/v3"
+)
+
+func TestRegistry(t *testing.T) {
+	client, err := clientv3.New(clientv3.Config{Endpoints: []string{"127.0.0.1:2379"},
+		DialTimeout: time.Second, DialOptions: []grpc.DialOption{grpc.WithBlock()}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer client.Close()
+
+	ctx := context.Background()
+	s := &registry.ServiceInstance{
+		ID:   "0",
+		Name: "helloworld",
+	}
+
+	r := New(client)
+	w, err := r.Watch(ctx, s.Name)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer w.Stop()
+	go func() {
+		for {
+			res, err := w.Next()
+			if err != nil {
+				return
+			}
+			t.Logf("watch: %d", len(res))
+			for _, r := range res {
+				t.Logf("next: %+v", r)
+			}
+		}
+	}()
+	time.Sleep(time.Second)
+
+	if err := r.Register(ctx, s); err != nil {
+		t.Fatal(err)
+	}
+	time.Sleep(time.Second)
+
+	res, err := r.GetService(ctx, s.Name)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(res) != 1 && res[0].Name != s.Name {
+		t.Errorf("not expected: %+v", res)
+	}
+
+	if err := r.Deregister(ctx, s); err != nil {
+		t.Fatal(err)
+	}
+	time.Sleep(time.Second)
+
+	res, err = r.GetService(ctx, s.Name)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(res) != 0 {
+		t.Errorf("not expected empty")
+	}
+}
+
+func TestHeartBeat(t *testing.T) {
+	client, err := clientv3.New(clientv3.Config{Endpoints: []string{"127.0.0.1:2379"},
+		DialTimeout: time.Second, DialOptions: []grpc.DialOption{grpc.WithBlock()}})
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer client.Close()
+
+	ctx := context.Background()
+	s := &registry.ServiceInstance{
+		ID:   "0",
+		Name: "helloworld",
+	}
+
+	go func() {
+		r := New(client)
+		w, err := r.Watch(ctx, s.Name)
+		if err != nil {
+			return
+		}
+		defer w.Stop()
+		for {
+			res, err := w.Next()
+			if err != nil {
+				return
+			}
+			t.Logf("watch: %d", len(res))
+			for _, r := range res {
+				t.Logf("next: %+v", r)
+			}
+		}
+	}()
+	time.Sleep(time.Second)
+
+	// new a server
+	r := New(client,
+		RegisterTTL(2*time.Second),
+		MaxRetry(5),
+	)
+
+	key := fmt.Sprintf("%s/%s/%s", r.opts.namespace, s.Name, s.ID)
+	value, _ := marshal(s)
+	r.lease = clientv3.NewLease(r.client)
+	leaseID, err := r.registerWithKV(ctx, key, value)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// wait for lease expired
+	time.Sleep(3 * time.Second)
+
+	res, err := r.GetService(ctx, s.Name)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(res) != 0 {
+		t.Errorf("not expected empty")
+	}
+
+	go r.heartBeat(ctx, leaseID, key, value)
+
+	time.Sleep(time.Second)
+	res, err = r.GetService(ctx, s.Name)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(res) == 0 {
+		t.Errorf("reconnect failed")
+	}
+
+}

registry/etcd/service.go

@@ -0,0 +1,20 @@
+package registry
+
+import (
+	"encoding/json"
+
+	"github.com/go-kratos/kratos/v2/registry"
+)
+
+func marshal(si *registry.ServiceInstance) (string, error) {
+	data, err := json.Marshal(si)
+	if err != nil {
+		return "", err
+	}
+	return string(data), nil
+}
+
+func unmarshal(data []byte) (si *registry.ServiceInstance, err error) {
+	err = json.Unmarshal(data, &si)
+	return
+}

registry/etcd/watcher.go

@@ -0,0 +1,72 @@
+package registry
+
+import (
+	"context"
+
+	"github.com/go-kratos/kratos/v2/registry"
+	clientv3 "go.etcd.io/etcd/client/v3"
+)
+
+var (
+	_ registry.Watcher = &watcher{}
+)
+
+type watcher struct {
+	key       string
+	ctx       context.Context
+	cancel    context.CancelFunc
+	watchChan clientv3.WatchChan
+	watcher   clientv3.Watcher
+	kv        clientv3.KV
+	first bool
+}
+
+func newWatcher(ctx context.Context, key string, client *clientv3.Client) *watcher {
+	w := &watcher{
+		key:     key,
+		watcher: clientv3.NewWatcher(client),
+		kv:      clientv3.NewKV(client),
+		first:   true,
+	}
+	w.ctx, w.cancel = context.WithCancel(ctx)
+	w.watchChan = w.watcher.Watch(w.ctx, key, clientv3.WithPrefix(), clientv3.WithRev(0))
+	w.watcher.RequestProgress(context.Background())
+	return w
+}
+
+func (w *watcher) Next() ([]*registry.ServiceInstance, error) {
+	if w.first {
+		item, err := w.getInstance()
+		w.first = false
+		return item, err
+	}
+
+	select {
+	case <-w.ctx.Done():
+		return nil, w.ctx.Err()
+	case <-w.watchChan:
+		return w.getInstance()
+	}
+
+}
+
+func (w *watcher) Stop() error {
+	w.cancel()
+	return w.watcher.Close()
+}
+
+func (w *watcher) getInstance() ([]*registry.ServiceInstance, error) {
+	resp, err := w.kv.Get(w.ctx, w.key, clientv3.WithPrefix())
+	if err != nil {
+		return nil, err
+	}
+	var items []*registry.ServiceInstance
+	for _, kv := range resp.Kvs {
+		si, err := unmarshal(kv.Value)
+		if err != nil {
+			return nil, err
+		}
+		items = append(items, si)
+	}
+	return items, nil
+}

registry/nacos/go.mod

@@ -0,0 +1,10 @@
+module github.com/go-kratos/kratos/registry/nacos/v2
+
+go 1.16
+
+require (
+	github.com/go-kratos/kratos/v2 v2.0.5
+	github.com/nacos-group/nacos-sdk-go v1.0.8
+)
+
+replace github.com/go-kratos/kratos/v2 => ../../../kratos

registry/nacos/go.sum

@@ -0,0 +1,232 @@
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registry/nacos/registry.go

@@ -0,0 +1,169 @@
+package registry
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"net/url"
+	"strconv"
+
+	"github.com/go-kratos/kratos/v2/registry"
+	"github.com/nacos-group/nacos-sdk-go/clients/naming_client"
+	"github.com/nacos-group/nacos-sdk-go/vo"
+)
+
+var (
+	_ registry.Registrar = (*Registry)(nil)
+	_ registry.Discovery = (*Registry)(nil)
+)
+
+type options struct {
+	prefix  string
+	weight  float64
+	cluster string
+	group   string
+}
+
+// Option is nacos option.
+type Option func(o *options)
+
+// WithPrefix with prefix path.
+func WithPrefix(prefix string) Option {
+	return func(o *options) { o.prefix = prefix }
+}
+
+// WithWeight with weight option.
+func WithWeight(weight float64) Option {
+	return func(o *options) { o.weight = weight }
+}
+
+// WithCluster with cluster option.
+func WithCluster(cluster string) Option {
+	return func(o *options) { o.cluster = cluster }
+}
+
+// WithGroup with group option.
+func WithGroup(group string) Option {
+	return func(o *options) { o.group = group }
+}
+
+// Registry is nacos registry.
+type Registry struct {
+	opts options
+	cli  naming_client.INamingClient
+}
+
+// New new a nacos registry.
+func New(cli naming_client.INamingClient, opts ...Option) (r *Registry) {
+	options := options{
+		prefix:  "/microservices",
+		cluster: "DEFAULT",
+		group:   "DEFAULT_GROUP",
+		weight:  100,
+	}
+	for _, option := range opts {
+		option(&options)
+	}
+	return &Registry{
+		opts: options,
+		cli:  cli,
+	}
+}
+
+// Register the registration.
+func (r *Registry) Register(ctx context.Context, si *registry.ServiceInstance) error {
+	if si.Name == "" {
+		return fmt.Errorf("kratos/nacos: serviceInstance.name cannot is empty")
+	}
+	for _, endpoint := range si.Endpoints {
+		u, err := url.Parse(endpoint)
+		if err != nil {
+			return err
+		}
+		host, port, err := net.SplitHostPort(u.Host)
+		if err != nil {
+			return err
+		}
+		p, err := strconv.Atoi(port)
+		if err != nil {
+			return err
+		}
+		if si.Metadata == nil {
+			si.Metadata = make(map[string]string)
+		}
+		si.Metadata["kind"] = u.Scheme
+		si.Metadata["version"] = si.Version
+		_, e := r.cli.RegisterInstance(vo.RegisterInstanceParam{
+			Ip:          host,
+			Port:        uint64(p),
+			ServiceName: si.Name + "." + u.Scheme,
+			Weight:      r.opts.weight,
+			Enable:      true,
+			Healthy:     true,
+			Ephemeral:   true,
+			Metadata:    si.Metadata,
+			ClusterName: r.opts.cluster,
+			GroupName:   r.opts.group,
+		})
+		if e != nil {
+			return fmt.Errorf("RegisterInstance err %v,%v", e, endpoint)
+		}
+	}
+	return nil
+}
+
+// Deregister the registration.
+func (r *Registry) Deregister(ctx context.Context, service *registry.ServiceInstance) error {
+	for _, endpoint := range service.Endpoints {
+		u, err := url.Parse(endpoint)
+		if err != nil {
+			return err
+		}
+		host, port, err := net.SplitHostPort(u.Host)
+		if err != nil {
+			return err
+		}
+		p, err := strconv.Atoi(port)
+		if err != nil {
+			return err
+		}
+		if _, err = r.cli.DeregisterInstance(vo.DeregisterInstanceParam{
+			Ip:          host,
+			Port:        uint64(p),
+			ServiceName: service.Name + "." + u.Scheme,
+			GroupName:   r.opts.group,
+			Cluster:     r.opts.cluster,
+			Ephemeral:   true,
+		}); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// Watch creates a watcher according to the service name.
+func (r *Registry) Watch(ctx context.Context, serviceName string) (registry.Watcher, error) {
+	return newWatcher(ctx, r.cli, serviceName, r.opts.group, []string{r.opts.cluster})
+}
+
+// GetService return the service instances in memory according to the service name.
+func (r *Registry) GetService(ctx context.Context, serviceName string) ([]*registry.ServiceInstance, error) {
+	res, err := r.cli.SelectInstances(vo.SelectInstancesParam{
+		ServiceName: serviceName,
+		HealthyOnly: true,
+	})
+	if err != nil {
+		return nil, err
+	}
+	var items []*registry.ServiceInstance
+	for _, in := range res {
+		items = append(items, &registry.ServiceInstance{
+			ID:        in.InstanceId,
+			Name:      in.ServiceName,
+			Version:   in.Metadata["version"],
+			Metadata:  in.Metadata,
+			Endpoints: []string{fmt.Sprintf("%s://%s:%d", in.Metadata["kind"], in.Ip, in.Port)},
+		})
+	}
+	return items, nil
+}

registry/nacos/watcher.go

@@ -0,0 +1,81 @@
+package registry
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/go-kratos/kratos/v2/registry"
+	"github.com/nacos-group/nacos-sdk-go/clients/naming_client"
+	"github.com/nacos-group/nacos-sdk-go/model"
+	"github.com/nacos-group/nacos-sdk-go/vo"
+)
+
+var (
+	_ registry.Watcher = (*watcher)(nil)
+)
+
+type watcher struct {
+	serviceName string
+	clusters    []string
+	groupName   string
+	ctx         context.Context
+	cancel      context.CancelFunc
+	watchChan   chan bool
+	cli         naming_client.INamingClient
+}
+
+func newWatcher(ctx context.Context, cli naming_client.INamingClient, serviceName string, groupName string, clusters []string) (*watcher, error) {
+	w := &watcher{
+		serviceName: serviceName,
+		clusters:    clusters,
+		groupName:   groupName,
+		cli:         cli,
+		watchChan:   make(chan bool, 1),
+	}
+	w.ctx, w.cancel = context.WithCancel(ctx)
+
+	e := w.cli.Subscribe(&vo.SubscribeParam{
+		ServiceName: serviceName,
+		Clusters:    clusters,
+		GroupName:   groupName,
+		SubscribeCallback: func(services []model.SubscribeService, err error) {
+			w.watchChan <- true
+		},
+	})
+	return w, e
+}
+
+func (w *watcher) Next() ([]*registry.ServiceInstance, error) {
+	for {
+		select {
+		case <-w.ctx.Done():
+			return nil, w.ctx.Err()
+		case <-w.watchChan:
+		}
+		res, err := w.cli.GetService(vo.GetServiceParam{
+			ServiceName: w.serviceName,
+			GroupName:   w.groupName,
+			Clusters:    w.clusters,
+		})
+		if err != nil {
+			return nil, err
+		}
+		var items []*registry.ServiceInstance
+		for _, in := range res.Hosts {
+			items = append(items, &registry.ServiceInstance{
+				ID:        in.InstanceId,
+				Name:      res.Name,
+				Version:   in.Metadata["version"],
+				Metadata:  in.Metadata,
+				Endpoints: []string{fmt.Sprintf("%s://%s:%d", in.Metadata["kind"], in.Ip, in.Port)},
+			})
+		}
+		return items, nil
+	}
+}
+
+func (w *watcher) Stop() error {
+	w.cancel()
+	//close
+	return nil
+}

registry/zookeeper/go.mod

@@ -0,0 +1,10 @@
+module github.com/go-kratos/kratos/registry/zookeeper/v2
+
+go 1.16
+
+require (
+	github.com/go-kratos/kratos/v2 v2.0.5
+	github.com/go-zookeeper/zk v1.0.2
+)
+
+replace github.com/go-kratos/kratos/v2 => ../../../kratos

registry/zookeeper/go.sum

@@ -0,0 +1,152 @@
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registry/zookeeper/register.go

@@ -0,0 +1,188 @@
+package registry
+
+import (
+	"context"
+	"encoding/json"
+	"path"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"github.com/go-kratos/kratos/v2/registry"
+	"github.com/go-zookeeper/zk"
+)
+
+var (
+	_ registry.Registrar = &Registry{}
+	_ registry.Discovery = &Registry{}
+)
+
+// Option is etcd registry option.
+type Option func(o *options)
+
+type options struct {
+	ctx      context.Context
+	rootPath string
+	timeout  time.Duration
+}
+
+// WithContext with registry context.
+func WithContext(ctx context.Context) Option {
+	return func(o *options) { o.ctx = ctx }
+}
+
+// WithRootPath with registry root path.
+func WithRootPath(path string) Option {
+	return func(o *options) { o.rootPath = path }
+}
+
+// WithTimeout with registry timeout.
+func WithTimeout(timeout time.Duration) Option {
+	return func(o *options) { o.timeout = timeout }
+}
+
+// Registry is consul registry
+type Registry struct {
+	opts     *options
+	conn     *zk.Conn
+	lock     sync.Mutex
+	registry map[string]*serviceSet
+}
+
+func New(zkServers []string, opts ...Option) (*Registry, error) {
+	options := &options{
+		ctx:      context.Background(),
+		rootPath: "/microservices",
+		timeout:  time.Second * 5,
+	}
+	for _, o := range opts {
+		o(options)
+	}
+	conn, _, err := zk.Connect(zkServers, options.timeout)
+	if err != nil {
+		return nil, err
+	}
+	return &Registry{
+		opts:     options,
+		conn:     conn,
+		registry: make(map[string]*serviceSet),
+	}, err
+}
+
+func (r *Registry) Register(ctx context.Context, service *registry.ServiceInstance) error {
+	var data []byte
+	var err error
+	if err := r.ensureName(r.opts.rootPath, []byte("")); err != nil {
+		return err
+	}
+	serviceNamePath := path.Join(r.opts.rootPath, service.Name)
+	if err = r.ensureName(serviceNamePath, []byte("")); err != nil {
+		return err
+	}
+	if data, err = json.Marshal(service); err != nil {
+		return err
+	}
+	servicePath := path.Join(serviceNamePath, service.ID)
+	if err = r.ensureName(servicePath, data); err != nil {
+		return err
+	}
+	return nil
+}
+
+// Deregister registry service to zookeeper.
+func (r *Registry) Deregister(ctx context.Context, service *registry.ServiceInstance) error {
+	ch := make(chan error, 1)
+	servicePath := path.Join(r.opts.rootPath, service.Name, service.ID)
+	go func() {
+		err := r.conn.Delete(servicePath, -1)
+		ch <- err
+	}()
+	var err error
+	select {
+	case <-ctx.Done():
+		err = ctx.Err()
+	case err = <-ch:
+	}
+	return err
+}
+
+// GetService get services from zookeeper
+func (r *Registry) GetService(ctx context.Context, serviceName string) ([]*registry.ServiceInstance, error) {
+	serviceNamePath := path.Join(r.opts.rootPath, serviceName)
+	servicesID, _, err := r.conn.Children(serviceNamePath)
+	if err != nil {
+		return nil, err
+	}
+	var items []*registry.ServiceInstance
+	for _, service := range servicesID {
+		var item = &registry.ServiceInstance{}
+		servicePath := path.Join(serviceNamePath, service)
+		serviceInstanceByte, _, err := r.conn.Get(servicePath)
+		if err != nil {
+			return nil, err
+		}
+		if err := json.Unmarshal(serviceInstanceByte, item); err != nil {
+			return nil, err
+		}
+		items = append(items, item)
+	}
+	return items, nil
+}
+
+func (r *Registry) Watch(ctx context.Context, serviceName string) (registry.Watcher, error) {
+	r.lock.Lock()
+	defer r.lock.Unlock()
+	set, ok := r.registry[serviceName]
+	if !ok {
+		set = &serviceSet{
+			watcher:     make(map[*watcher]struct{}, 0),
+			services:    &atomic.Value{},
+			serviceName: serviceName,
+		}
+		r.registry[serviceName] = set
+	}
+	// 初始化watcher
+	w := &watcher{
+		event: make(chan struct{}, 1),
+	}
+	w.ctx, w.cancel = context.WithCancel(context.Background())
+	w.set = set
+	set.lock.Lock()
+	set.watcher[w] = struct{}{}
+	set.lock.Unlock()
+	ss, _ := set.services.Load().([]*registry.ServiceInstance)
+	if len(ss) > 0 {
+		// 如果services有值需要推送给watcher，否则watch的时候可能会永远阻塞拿不到初始的数据
+		w.event <- struct{}{}
+	}
+
+	// 放在最后是为了防止漏推送
+	if !ok {
+		go r.resolve(set)
+	}
+	return w, nil
+}
+
+func (r *Registry) resolve(ss *serviceSet) {
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
+	services, err := r.GetService(ctx, ss.serviceName)
+	cancel()
+	if err == nil && len(services) > 0 {
+		ss.broadcast(services)
+	}
+}
+
+// ensureName ensure node exists, if not exist, create and set data
+func (r *Registry) ensureName(path string, data []byte) error {
+	exists, _, err := r.conn.Exists(path)
+	if err != nil {
+		return err
+	}
+	if !exists {
+		_, err := r.conn.Create(path, data, 0, zk.WorldACL(zk.PermAll))
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}

registry/zookeeper/register_test.go

@@ -0,0 +1,71 @@
+package registry
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/go-kratos/kratos/v2/registry"
+)
+
+func TestRegistry(t *testing.T) {
+	ctx := context.Background()
+	s := &registry.ServiceInstance{
+		ID:        "0",
+		Name:      "helloworld",
+		Endpoints: []string{"http://127.0.0.1:1111"},
+	}
+
+	r, _ := New([]string{"127.0.0.1:2181"})
+
+	w, err := r.Watch(ctx, s.Name)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer w.Stop()
+	go func() {
+		for {
+			res, err := w.Next()
+			if err != nil {
+				return
+			}
+			t.Logf("watch: %d", len(res))
+			for _, r := range res {
+				t.Logf("next: %+v", r)
+			}
+		}
+	}()
+	time.Sleep(time.Second)
+
+	if err := r.Register(ctx, s); err != nil {
+		t.Fatal(err)
+	}
+	time.Sleep(time.Second)
+
+	res, err := r.GetService(ctx, s.Name)
+	if err != nil {
+		t.Fatal(err)
+	}
+	for i, re := range res {
+		t.Logf("first %d re:%v\n", i, re)
+	}
+	if len(res) != 1 && res[0].Name != s.Name {
+		t.Errorf("not expected: %+v", res)
+	}
+
+	if err := r.Deregister(ctx, s); err != nil {
+		t.Fatal(err)
+	}
+	time.Sleep(time.Second)
+
+	res, err = r.GetService(ctx, s.Name)
+	if err != nil {
+		t.Fatal(err)
+	}
+	for i, re := range res {
+		t.Logf("second %d re:%v\n", i, re)
+	}
+	if len(res) != 0 {
+		t.Errorf("not expected empty")
+	}
+}

registry/zookeeper/service.go

@@ -0,0 +1,27 @@
+package registry
+
+import (
+	"sync"
+	"sync/atomic"
+
+	"github.com/go-kratos/kratos/v2/registry"
+)
+
+type serviceSet struct {
+	serviceName string
+	watcher     map[*watcher]struct{}
+	services    *atomic.Value
+	lock        sync.RWMutex
+}
+
+func (s *serviceSet) broadcast(ss []*registry.ServiceInstance) {
+	s.services.Store(ss)
+	s.lock.RLock()
+	defer s.lock.RUnlock()
+	for k := range s.watcher {
+		select {
+		case k.event <- struct{}{}:
+		default:
+		}
+	}
+}

registry/zookeeper/watcher.go

@@ -0,0 +1,41 @@
+package registry
+
+import (
+	"context"
+
+	"github.com/go-kratos/kratos/v2/registry"
+)
+
+var (
+	_ registry.Watcher = &watcher{}
+)
+
+type watcher struct {
+	ctx    context.Context
+	cancel context.CancelFunc
+	event  chan struct{}
+	set    *serviceSet
+}
+
+func (w watcher) Next() (services []*registry.ServiceInstance, err error) {
+	select {
+	case <-w.ctx.Done():
+		err = w.ctx.Err()
+	case <-w.event:
+	}
+	ss, ok := w.set.services.Load().([]*registry.ServiceInstance)
+	if ok {
+		for _, s := range ss {
+			services = append(services, s)
+		}
+	}
+	return
+}
+
+func (w *watcher) Stop() error {
+	w.cancel()
+	w.set.lock.Lock()
+	defer w.set.lock.Unlock()
+	delete(w.set.watcher, w)
+	return nil
+}