基本介绍

GoFrame框架提供了服务注册发现组件，由gsvc组件管理，该组件主要定义了注册发现的接口，具体的实现由社区组件提供： https://github.com/gogf/gf/tree/master/contrib/registry 。目前社区组件提供了多种注册发现的实现，如 etcd, zookeeper, polaris等，开发者根据需要插拔使用，也可以根据gsvc组件的接口定义实现自己的注册发现组件。

组件启用

注册发现组件只有在引入具体的接口实现时才会启用。例如，使用etcd实现注册发现的使用方式：

package main
import (
    "github.com/gogf/gf/contrib/registry/etcd/v2"
    "github.com/gogf/gf/v2/net/gsvc"
)
func main() {
    gsvc.SetRegistry(etcd.New(`127.0.0.1:2379`))
    // ...
}

常用组件

更多组件，请参考：https://github.com/gogf/gf/tree/master/contrib/registry

使用示例

HTTP

可以使用gsvc.SetRegistry(etcd.New(`127.0.0.1:2379`))来设置使用etcd的注册发现。其中的etcd.New表示通过社区组件创建一个gsvc.Registry的接口实现对象，并通过gsvc.SetRegistry方法设置全局默认的注册发现接口实现对象。

server.go

package main
import (
    "github.com/gogf/gf/contrib/registry/etcd/v2"
    "github.com/gogf/gf/v2/frame/g"
    "github.com/gogf/gf/v2/net/ghttp"
    "github.com/gogf/gf/v2/net/gsvc"
)
func main() {
    gsvc.SetRegistry(etcd.New(`127.0.0.1:2379`))
    s := g.Server(`hello.svc`)
    s.BindHandler("/", func(r *ghttp.Request) {
        g.Log().Info(r.Context(), `request received`)
        r.Response.Write(`Hello world`)
    })
    s.Run()
}

client.go

package main
import (
    "github.com/gogf/gf/contrib/registry/etcd/v2"
    "github.com/gogf/gf/v2/frame/g"
    "github.com/gogf/gf/v2/net/gsvc"
    "github.com/gogf/gf/v2/os/gctx"
)
func main() {
    gsvc.SetRegistry(etcd.New(`127.0.0.1:2379`))
    ctx := gctx.New()
    res := g.Client().GetContent(ctx, `http://hello.svc/`)
    g.Log().Info(ctx, res)
}

执行后，服务端输出：

$ go run server.go
2023-03-15 20:55:56.256 [INFO] pid[3358]: http server started listening on [:60700]
2023-03-15 20:55:56.256 [INFO] openapi specification is disabled
2023-03-15 20:55:56.256 [DEBU] service register: &{Head: Deployment: Namespace: Name:hello.svc Version: Endpoints:10.35.12.81:60700 Metadata:map[insecure:true protocol:http]}
2023-03-15 20:55:56.297 [DEBU] etcd put success with key "/service/default/default/hello.svc/latest/10.35.12.81:60700", value "{"insecure":true,"protocol":"http"}", lease "7587869265945813002"
   SERVER   | DOMAIN  | ADDRESS | METHOD | ROUTE |                             HANDLER                             |    MIDDLEWARE      
------------|---------|---------|--------|-------|-----------------------------------------------------------------|--------------------
  hello.svc | default | :60700  | ALL    | /     | main.main.func1                                                 |                    
------------|---------|---------|--------|-------|-----------------------------------------------------------------|--------------------
  hello.svc | default | :60700  | ALL    | /*    | github.com/gogf/gf/v2/net/ghttp.internalMiddlewareServerTracing | GLOBAL MIDDLEWARE  
------------|---------|---------|--------|-------|-----------------------------------------------------------------|--------------------
2023-03-15 20:56:45.739 [INFO] {880eaa8104994c17ffb384495cd4c613} request received

客户端输出：

$ go run client.go
2023-03-15 20:56:45.739 [INFO] {880eaa8104994c17ffb384495cd4c613} Hello world

GRPC

如果是GRPC协议，必须使用grpcx.Resolver的grpcx模块来设置服务注册发现组件。

server.go

代码中的etcd.New表示通过社区组件创建一个gsvc.Registry的接口实现对象，并通过grpcx.Resolver.Register设置全局的grpc注册发现接口实现对象。

package main
import (
    "github.com/gogf/gf/contrib/registry/etcd/v2"
    "github.com/gogf/gf/contrib/rpc/grpcx/v2"
    "github.com/gogf/gf/example/registry/etcd/grpc/controller"
)
func main() {
    grpcx.Resolver.Register(etcd.New("127.0.0.1:2379"))
    s := grpcx.Server.New()
    controller.Register(s)
    s.Run()
}

client.go

package main
import (
    "github.com/gogf/gf/contrib/registry/etcd/v2"
    "github.com/gogf/gf/contrib/rpc/grpcx/v2"
    "github.com/gogf/gf/example/registry/etcd/grpc/protobuf"
    "github.com/gogf/gf/v2/frame/g"
    "github.com/gogf/gf/v2/os/gctx"
)
func main() {
    grpcx.Resolver.Register(etcd.New("127.0.0.1:2379"))
    var (
        ctx    = gctx.New()
        conn   = grpcx.Client.MustNewGrpcClientConn("demo")
        client = protobuf.NewGreeterClient(conn)
    )
    res, err := client.SayHello(ctx, &protobuf.HelloRequest{Name: "World"})
    if err != nil {
        g.Log().Error(ctx, err)
        return
    }
    g.Log().Debug(ctx, "Response:", res.Message)
}

执行后，服务端输出：

$ go run server.go
2023-03-15 21:06:57.204 [DEBU] service register: &{Head: Deployment: Namespace: Name:demo Version: Endpoints:10.35.12.81:61978 Metadata:map[protocol:grpc]}
2023-03-15 21:06:57.257 [DEBU] etcd put success with key "/service/default/default/demo/latest/10.35.12.81:61978", value "{"protocol":"grpc"}", lease "7587869265945813015"
2023-03-15 21:06:57.257 [INFO] pid[5786]: grpc server started listening on [:61978]
2023-03-15 21:07:04.955 {08f0aead94994c1731591d2b653ddc18} /protobuf.Greeter/SayHello, 0.002ms, name:"World", message:"Hello World"

客户端输出：

$ go run client.go
2023-03-15 21:07:04.950 [DEBU] Watch key "/service/default/default/demo/latest/"
2023-03-15 21:07:04.952 [DEBU] client conn updated with addresses [{"Addr":"10.35.12.81:61978","ServerName":"demo","Attributes":{},"BalancerAttributes":null,"Type":0,"Metadata":null}]
2023-03-15 21:07:04.953 [DEBU] client conn updated with addresses [{"Addr":"10.35.12.81:61978","ServerName":"demo","Attributes":{},"BalancerAttributes":null,"Type":0,"Metadata":null}]
2023-03-15 21:07:04.955 [DEBU] {08f0aead94994c1731591d2b653ddc18} Response: Hello World