eureka

Hertz 提供的服务注册与发现 eureka 拓展。

安装

go get github.com/hertz-contrib/eureka

服务注册

NewEurekaRegistry

NewEurekaRegistry 使用 eureka 创建一个新的服务注册中心,需要将服务 Url 通过一个字符串切片传入 NewConn,并同时传入心跳间隔时长。

函数签名:

func NewEurekaRegistry(servers []string, heatBeatInterval time.Duration) *eurekaRegistry

示例代码:

func main() {
    // ...
    r := eureka.NewEurekaRegistry([]string{"http://127.0.0.1:8761/eureka"}, 40*time.Second)
    h := server.Default(
        server.WithHostPorts(addr),
        server.WithRegistry(r, &registry.Info{
            ServiceName: "hertz.discovery.eureka",
            Addr:        utils.NewNetAddr("tcp", addr),
            Weight:      10,
            Tags:        nil,
        }))
    //...
}

NewEurekaRegistryFromConfig

NewEurekaRegistryFromConfig 使用 eureka 创建一个新的服务注册中心,需要传入配置并调用 NewConnFromConfig,也需要传入心跳间隔时长。

函数签名:

func NewEurekaRegistryFromConfig(config fargo.Config, heatBeatInterval time.Duration) *eurekaRegistry

示例代码:

func main() {
    // ...
    config := fargo.Config{
    // ...
    }
    r := eureka.NewEurekaRegistryFromConfig(config, 40*time.Second)
    h := server.Default(
        server.WithHostPorts(addr),
        server.WithRegistry(r, &registry.Info{
            ServiceName: "hertz.discovery.eureka",
            Addr:        utils.NewNetAddr("tcp", addr),
            Weight:      10,
            Tags:        nil,
        }))
    //...
}

NewEurekaRegistryFromConn

NewEurekaRegistryFromConn 使用 eureka 创建一个新的服务注册中心,需要直接传入 conn,也需要传入心跳间隔时长。

函数签名:

func NewEurekaRegistryFromConn(conn fargo.EurekaConnection, heatBeatInterval time.Duration) *eurekaRegistry

示例代码:

func main() {
    // ...
    conn := fargo.EurekaConnection{
    // ...
    }
    r := eureka.NewEurekaRegistryFromConn(conn, 40*time.Second)
    h := server.Default(
        server.WithHostPorts(addr),
        server.WithRegistry(r, &registry.Info{
            ServiceName: "hertz.discovery.eureka",
            Addr:        utils.NewNetAddr("tcp", addr),
            Weight:      10,
            Tags:        nil,
        }))
    //...
}

服务发现

NewEurekaResolver

NewEurekaResolver 使用 eureka 创建一个新的服务发现中心,需要将服务 Url 通过一个字符串切片传入 NewConn

函数签名:

func NewEurekaResolver(servers []string) *eurekaResolver

示例代码:

func main() {
    cli, err := client.NewClient()
    if err != nil {
        hlog.Fatal(err)
        return
    }
    r := eureka.NewEurekaResolver([]string{"http://127.0.0.1:8761/eureka"})

    cli.Use(sd.Discovery(r))
    // ...
}

NewEurekaResolverFromConfig

NewEurekaResolverFromConfig 使用 eureka 创建一个新的服务发现中心,需要传入配置并调用 NewConnFromConfig

函数签名:

func NewEurekaResolverFromConfig(config fargo.Config) *eurekaResolver

示例代码:

func main() {
    // ...
    config := fargo.Config{
    // ...
    }
    cli, err := client.NewClient()
    if err != nil {
        hlog.Fatal(err)
        return
    }
    r := eureka.NewEurekaResolverFromConfig(config)

    cli.Use(sd.Discovery(r))
    // ...
}

NewEurekaResolverFromConn

NewEurekaResolverFromConn 使用 eureka 创建一个新的服务发现中心,需要直接传入 conn。

函数签名:

func NewEurekaResolverFromConn(conn fargo.EurekaConnection) *eurekaResolver

示例代码:

func main() {
    // ...
    conn := fargo.EurekaConnection{
    // ...
    }
    cli, err := client.NewClient()
    if err != nil {
        hlog.Fatal(err)
        return
    }
    r := eureka.NewEurekaResolverFromConn(conn)

    cli.Use(sd.Discovery(r))
    // ...
}

使用示例

服务端

import (
    "context"
    "time"

    "github.com/cloudwego/hertz/pkg/app"
    "github.com/cloudwego/hertz/pkg/app/server"
    "github.com/cloudwego/hertz/pkg/app/server/registry"
    "github.com/cloudwego/hertz/pkg/common/utils"
    "github.com/cloudwego/hertz/pkg/protocol/consts"
    "github.com/hertz-contrib/registry/eureka"
)

func main() {
    addr := "127.0.0.1:8888"
    r := eureka.NewEurekaRegistry([]string{"http://127.0.0.1:8761/eureka"}, 40*time.Second)
    h := server.Default(
        server.WithHostPorts(addr),
        server.WithRegistry(r, &registry.Info{
            ServiceName: "hertz.discovery.eureka",
            Addr:        utils.NewNetAddr("tcp", addr),
            Weight:      10,
            Tags:        nil,
        }))
    h.GET("/ping", func(c context.Context, ctx *app.RequestContext) {
        ctx.JSON(consts.StatusOK, utils.H{"ping": "pong2"})
    })
    h.Spin()
}

客户端

import (
    "context"

    "github.com/cloudwego/hertz/pkg/app/client"
    "github.com/cloudwego/hertz/pkg/app/middlewares/client/sd"
    "github.com/cloudwego/hertz/pkg/common/config"
    "github.com/cloudwego/hertz/pkg/common/hlog"
    "github.com/hertz-contrib/registry/eureka"
)

func main() {
    cli, err := client.NewClient()
    if err != nil {
        hlog.Fatal(err)
        return
    }
    r := eureka.NewEurekaResolver([]string{"http://127.0.0.1:8761/eureka"})

    cli.Use(sd.Discovery(r))
    for i := 0; i < 10; i++ {
        status, body, err := cli.Get(context.Background(), nil, "http://hertz.discovery.eureka/ping", config.WithSD(true))
        if err != nil {
            hlog.Fatal(err)
        }
        hlog.Infof("code=%d,body=%s", status, string(body))
    }
}

配置

本项目使用 fargo 作为 eureka 客户端。您应该参考 fargo 文档以了解高级配置。

完整示例

完整用法示例详见 example


最后修改 May 8, 2024 : style: prettier lint fix (#1069) (dff8f17)