add simple gRPC test client

testclient/main.go

@@ -0,0 +1,61 @@
+/*
+ *
+ * Copyright 2015 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+// Package main implements a client for Greeter service.
+package main
+
+import (
+	"context"
+	"log"
+	"sync"
+	"time"
+
+	pb "github.com/zcash/lightwalletd/walletrpc"
+	"google.golang.org/grpc"
+)
+
+const (
+	address = "localhost:9067"
+)
+
+func main() {
+	// Set up a connection to the server.
+	conn, err := grpc.Dial(address, grpc.WithInsecure(), grpc.WithBlock())
+	if err != nil {
+		log.Fatalf("did not connect: %v", err)
+	}
+	defer conn.Close()
+	c := pb.NewCompactTxStreamerClient(conn)
+
+	ctx, cancel := context.WithTimeout(context.Background(), 1000*time.Second)
+	defer cancel()
+	var wg sync.WaitGroup
+	simultaneous := 2
+	wg.Add(simultaneous)
+	for i := 0; i < simultaneous; i++ {
+		go func() {
+			r, err := c.GetLightdInfo(ctx, &pb.Empty{})
+			if err != nil {
+				log.Fatalf("could not greet: %v", err)
+			}
+			log.Printf("LightdInfo: %v", r)
+			wg.Done()
+		}()
+	}
+	wg.Wait()
+}