Nacos

Service Registration and Discovery nacos Extensions provided by Kitex.

Install

  • nacos-sdk-go v1 version
go get github.com/kitex-contrib/registry-nacos
  • nacos-sdk-go v2 version
go get github.com/kitex-contrib/registry-nacos/v2

Service Registry

Create Registry

Kitex provides two functions to create service registry.

NewDefaultNacosRegistry

NewDefaultNacosRegistry uses nacos to create a new service registry, and read info from environment variable to create “Nacos Client”. Customizable service registry configuration, see Option for configuration details.

Environment Variable NameEnvironment Variable Default ValueEnvironment Variable Introduction
serverAddr127.0.0.1nacos server address
serverPort8848nacos server port
namespacethe namespaceId of nacos

Function signature:

func NewDefaultNacosRegistry(opts ...Option) (registry.Registry, error

Example:

import (
    // ...
    "github.com/kitex-contrib/registry-nacos/registry"
    "github.com/nacos-group/nacos-sdk-go/clients"
    "github.com/nacos-group/nacos-sdk-go/clients/naming_client"
    "github.com/nacos-group/nacos-sdk-go/common/constant"
    "github.com/nacos-group/nacos-sdk-go/vo"
    "github.com/cloudwego/kitex/pkg/rpcinfo"
    // ...
)

func main() {
    // ...
    r, err := registry.NewDefaultNacosRegistry()
    if err != nil {
        panic(err)
    }
    svr := echo.NewServer(
        new(EchoImpl),
        server.WithServerBasicInfo(&rpcinfo.EndpointBasicInfo{ServiceName: "echo"}),
        server.WithRegistry(r),
	)
    if err := svr.Run(); err != nil {
        log.Println("server stopped with error:", err)
    } else {
        log.Println("server stopped")
    }
    // ...
}

NewNacosRegistry

NewNacosRegistry uses nacos to create a new service registry, requires passing in a self-configured client. Customizable service registry configuration, see Option for configuration details.

Function signature:

func NewNacosRegistry(cli naming_client.INamingClient, opts ...Option) registry.Registry

Example:

import (
    // ...
    "github.com/kitex-contrib/registry-nacos/registry"
    "github.com/nacos-group/nacos-sdk-go/clients"
    "github.com/nacos-group/nacos-sdk-go/clients/naming_client"
    "github.com/nacos-group/nacos-sdk-go/common/constant"
    "github.com/nacos-group/nacos-sdk-go/vo"
    // ...
)
func main() {
    // ...
    sc := []constant.ServerConfig{
        *constant.NewServerConfig("127.0.0.1", 8848),
    }

    cc := constant.ClientConfig{
        NamespaceId:         "public",
        TimeoutMs:           5000,
        NotLoadCacheAtStart: true,
        LogDir:              "/tmp/nacos/log",
        CacheDir:            "/tmp/nacos/cache",
        LogLevel:            "info",
        Username:            "your-name",
        Password:            "your-password",
    }

    cli, err := clients.NewNamingClient(
        vo.NacosClientParam{
            ClientConfig:  &cc,
            ServerConfigs: sc,
        },
    )
    if err != nil {
        panic(err)
    }

    svr := echo.NewServer(new(EchoImpl),
		server.WithServerBasicInfo(&rpcinfo.EndpointBasicInfo{ServiceName: "echo"}),
		server.WithRegistry(registry.NewNacosRegistry(cli)),
    )
    if err := svr.Run(); err != nil {
        log.Println("server stopped with error:", err)
    } else {
        log.Println("server stopped")
    }
    // ...
}

Option

Nacos extension provides option configuration in the service registry section.

WithCluster

Nacos extension provides WithCluster to help users configure the cluster in nacos. The default value is “DEFAULT”.

Function signature:

func WithCluster(cluster string) Option

WithGroup

Nacos extension provides WithGroup to help users configure the cluster in nacos. The default value is “DEFAULT_GROUP”.

Function signature:

func WithGroup(group string) Option

Service Discovery

Create Resolver

Kitex provides two functions to create Resolver.

NewDefaultNacosResolver

NewDefaultNacosResolver uses nacos to create a new service resolver, and read info from environment variable to create “Nacos Client”. Customizable service registry configuration, see Option for configuration details.

Environment Variable NameEnvironment Variable Default ValueEnvironment Variable Introduction
serverAddr127.0.0.1nacos server address
serverPort8848nacos server port
namespacethe namespaceId of nacos

Function signature:

func NewDefaultNacosResolver(opts ...Option) (discovery.Resolver, error)

Example:

import (
    // ...
    "github.com/kitex-contrib/registry-nacos/resolver"
    "github.com/nacos-group/nacos-sdk-go/clients"
    "github.com/nacos-group/nacos-sdk-go/clients/naming_client"
    "github.com/nacos-group/nacos-sdk-go/common/constant"
    "github.com/nacos-group/nacos-sdk-go/vo"
    // ...
)

func main() {
    // ...
    r, err := resolver.NewDefaultNacosResolver()
	if err != nil {
	    panic(err)
    }
    client, err := echo.NewClient("echo", client.WithResolver(r))
    if err != nil {
        log.Fatal(err)
    }
    // ...
}

NewNacosResolver

NewNacosResolver uses nacos to create a new service resolver, requires passing in a self-configured client. Customizable service registry configuration, see Option for configuration details.

Function signature:

func NewNacosResolver(cli naming_client.INamingClient, opts ...Option) discovery.Resolver

Example:

import (
    // ...
    "github.com/kitex-contrib/registry-nacos/resolver"
    "github.com/nacos-group/nacos-sdk-go/clients"
    "github.com/nacos-group/nacos-sdk-go/clients/naming_client"
    "github.com/nacos-group/nacos-sdk-go/common/constant"
    "github.com/nacos-group/nacos-sdk-go/vo"
    // ...
)
func main() {
    // ...
    sc := []constant.ServerConfig{
	    *constant.NewServerConfig("127.0.0.1", 8848),
	}
    cc := constant.ClientConfig{
        NamespaceId:         "public",
        TimeoutMs:           5000,
        NotLoadCacheAtStart: true,
        LogDir:              "/tmp/nacos/log",
        CacheDir:            "/tmp/nacos/cache",
        LogLevel:            "info",
        Username:            "your-name",
        Password:            "your-password",
    }

    cli, err := clients.NewNamingClient(
        vo.NacosClientParam{
            ClientConfig:  &cc,
            ServerConfigs: sc,
        },
    )
    if err != nil {
	    panic(err)
    }
    client, err := echo.NewClient("echo", client.WithResolver(resolver.NewNacosResolver(cli))
    if err != nil {
        log.Fatal(err)
    }
    // ...
}

Option

Nacos extension provides option configuration in the service discovery section.

WithCluster

Nacos extension provides WithCluster to help users configure the cluster in nacos. The default value is “DEFAULT”.

Function signature:

func WithCluster(cluster string) Option

WithGroup

Nacos extension provides WithGroup to help users configure the cluster in nacos. The default value is “DEFAULT_GROUP”.

Function signature:

func WithGroup(group string) Option

How To Use

Server

package main

import (
	"context"
	"log"
	"net"

	"github.com/cloudwego/kitex/pkg/rpcinfo"
	"github.com/cloudwego/kitex/server"
	"github.com/kitex-contrib/registry-nacos/example/hello/kitex_gen/api"
	"github.com/kitex-contrib/registry-nacos/example/hello/kitex_gen/api/hello"
	"github.com/kitex-contrib/registry-nacos/registry"
)

type HelloImpl struct{}

func (h *HelloImpl) Echo(_ context.Context, req *api.Request) (resp *api.Response, err error) {
	resp = &api.Response{
		Message: req.Message,
	}
	return
}

func main() {
	r, err := registry.NewDefaultNacosRegistry()
	if err != nil {
		panic(err)
	}
	svr := hello.NewServer(
		new(HelloImpl),
		server.WithRegistry(r),
		server.WithServerBasicInfo(&rpcinfo.EndpointBasicInfo{ServiceName: "Hello"}),
		server.WithServiceAddr(&net.TCPAddr{IP: net.IPv4(127, 0, 0, 1), Port: 8080}),
	)
	if err := svr.Run(); err != nil {
		log.Println("server stopped with error:", err)
	} else {
		log.Println("server stopped")
	}
}

Client

package main

import (
	"context"
	"log"
	"time"

	"github.com/cloudwego/kitex/client"
	"github.com/kitex-contrib/registry-nacos/example/hello/kitex_gen/api"
	"github.com/kitex-contrib/registry-nacos/example/hello/kitex_gen/api/hello"
	"github.com/kitex-contrib/registry-nacos/resolver"
)

func main() {
	r, err := resolver.NewDefaultNacosResolver()
	if err != nil {
		panic(err)
	}
	newClient := hello.MustNewClient(
		"Hello",
		client.WithResolver(r),
		client.WithRPCTimeout(time.Second*3),
	)
	for {
		resp, err := newClient.Echo(context.Background(), &api.Request{Message: "Hello"})
		if err != nil {
			log.Fatal(err)
		}
		log.Println(resp)
		time.Sleep(time.Second)
	}
}

Caution

  • The nacos/v2 version of kitex does not currently support creating multiple port examples in the same group multiple times.
  • Service registration and discovery in nacos/v2 is compatible with previous versions.
  • CustomLogger type in constant.ClientConfig has been removed in nacos-sdk-go v2.
  • nacos/v2 only supports nacos 2.X version.

Configuration

The configuration of Etcd client and server can be customized, refer to the configuration of nacos-sdk-go.

Complete Example

For more, see example.


Last modified June 24, 2024 : fix: correct the file path (#1096) (b3fa1a4)