support links in the proxy

proxy/proxy.go

@@ -13,6 +13,8 @@ import (
 // Proxy can be used as a proxy server for go-micro services
 type Proxy interface {
 	options.Options
+	// SendRequest honours the client.Router interface
+	SendRequest(context.Context, client.Request, client.Response) error
 	// ServeRequest honours the server.Router interface
 	ServeRequest(context.Context, server.Request, server.Response) error
 }
@@ -35,3 +37,20 @@ func WithClient(c client.Client) options.Option {
 func WithRouter(r router.Router) options.Option {
 	return options.WithValue("proxy.router", r)
 }
+
+// WithLink sets a link for outbound requests
+func WithLink(name string, c client.Client) options.Option {
+	return func(o *options.Values) error {
+		var links map[string]client.Client
+		v, ok := o.Get("proxy.links")
+		if ok {
+			links = v.(map[string]client.Client)
+		} else {
+			links = map[string]client.Client{}
+		}
+		links[name] = c
+		// save the links
+		o.Set("proxy.links", links)
+		return nil
+	}
+}