add support for streaming requests. cleanup watcher initilisation

examples/server/handler/example.go

@@ -13,7 +13,24 @@ type Example struct{}
 
 func (e *Example) Call(ctx context.Context, req *example.Request, rsp *example.Response) error {
 	md, _ := c.GetMetadata(ctx)
-	log.Info("Received Example.Call request with metadata: %v", md)
+	log.Infof("Received Example.Call request with metadata: %v", md)
 	rsp.Msg = server.Config().Id() + ": Hello " + req.Name
 	return nil
 }
+
+func (e *Example) Stream(ctx context.Context, req *example.StreamingRequest, response func(interface{}) error) error {
+	log.Infof("Received Example.Stream request with count: %d", req.Count)
+	for i := 0; i < int(req.Count); i++ {
+		log.Infof("Responding: %d", i)
+
+		r := &example.StreamingResponse{
+			Count: int64(i),
+		}
+
+		if err := response(r); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}