服务注册与发现扩展

// Registry is extension interface of service registry.
type Registry interface {
	Register(info *Info) error
	Deregister(info *Info) error
}

// Info is used for registry.
// The fields are just suggested, which is used depends on design.
type Info struct {
	ServiceName string
	Addr net.Addr
	Weight int
	// extend other infos with Tags.
	Tags map[string]string
}

    h := server.Default(
    	server.WithHostPorts(addr),
    	server.WithRegistry(r, &registry.Info{
    		ServiceName: "hertz.test.demo",
    		Addr:        utils.NewNetAddr("tcp", addr),
    		Weight:      10,
    		Tags:        nil,
    	}))

type Resolver interface {
	// Target should return a description for the given target that is suitable for being a key for cache.
	Target(ctx context.Context, target *TargetInfo) string

	// Resolve returns a list of instances for the given description of a target.
	Resolve(ctx context.Context, desc string) (Result, error)

	// Name returns the name of the resolver.
	Name() string
}

type TargetInfo struct {
    Host string
    Tags map[string]string
}

type Result struct {
    CacheKey  string // 缓存的唯一 key
    Instances []Instance // 服务发现结果
}

    cli, err := client.NewClient()
    if err != nil {
        panic(err)
    }
    r := nacos_demo.NewNacosResolver()
    cli.Use(sd.Discovery(r))

    // Loadbalancer picks instance for the given service discovery result.
    type Loadbalancer interface {
        // Pick is used to select an instance according to discovery result
        Pick(discovery.Result) discovery.Instance

        // Rebalance is used to refresh the cache of load balance's information
        Rebalance(discovery.Result)

        // Delete is used to delete the cache of load balance's information when it is expired
        Delete(string)

        // Name returns the name of the Loadbalancer.
        Name() string
    }

    cli, err := client.NewClient()
    if err != nil {
        panic(err)
    }
    r := nacos_demo.NewNacosResolver()
    cli.Use(sd.Discovery(r, sd.WithLoadBalanceOptions(***,***)))