broker/service: use wrapped micro client to authenticate requests (#1782)

broker/service/options.go

@@ -0,0 +1,22 @@
+package service
+
+import (
+	"context"
+
+	"github.com/micro/go-micro/v2/broker"
+	"github.com/micro/go-micro/v2/client"
+)
+
+type clientKey struct{}
+
+// Client to call broker service
+func Client(c client.Client) broker.Option {
+	return func(o *broker.Options) {
+		if o.Context == nil {
+			o.Context = context.WithValue(context.Background(), clientKey{}, c)
+			return
+		}
+
+		o.Context = context.WithValue(o.Context, clientKey{}, c)
+	}
+}

broker/service/service.go

@@ -138,6 +138,12 @@ func NewBroker(opts ...broker.Option) broker.Broker {
 
 	cli := client.DefaultClient
 
+	// get options client from the context. We set this in the context to prevent an import loop, as
+	// the client depends on the broker
+	if c, ok := options.Context.Value(clientKey{}).(client.Client); ok {
+		cli = c
+	}
+
 	return &serviceBroker{
 		Addrs:   addrs,
 		Client:  pb.NewBrokerService(DefaultName, cli),