lyuxuan · October 20, 2024 15:41 · Dec 22, 2018 · Oct 23, 2018 · Aug 29, 2018 · Aug 29, 2018
diff --git a/main.go b/main.go
@@ -41,7 +41,7 @@ const (
 
 func main() {
 	/***** Set up the server serving channelz service. *****/
-	lis, err := net.Listen("tcp", ":50051")
+	lis, err := net.Listen("tcp", ":50050")
 	if err != nil {
 		log.Fatalf("failed to listen: %v", err)
 	}

diff --git a/main.go b/main.go
@@ -89,5 +89,5 @@ func main() {
 	ch := make(chan os.Signal, 1)
 	signal.Notify(ch, os.Interrupt)
 	// Block until a signal is received.
-	sig := <-ch
+	<-ch
 }
diff --git a/main.go b/main.go
@@ -41,8 +41,6 @@ const (
 
 func main() {
 	/***** Set up the server serving channelz service. *****/
-	// TODO: delete TurnOn.
-	channelz.TurnOn()
 	lis, err := net.Listen("tcp", ":50051")
 	if err != nil {
 		log.Fatalf("failed to listen: %v", err)

diff --git a/main.go b/main.go
@@ -85,7 +85,7 @@ func main() {
 		}
 	}
 
-	// Wait for CTRL+C to exit.
+	/***** Wait for CTRL+C to exit *****/
 	// Unless you exit the program with CTRL+C, channelz data will be available for querying. 
 	// Users can take time to examine and learn about the info provided by channelz.
 	ch := make(chan os.Signal, 1)

diff --git a/main.go b/main.go
@@ -52,7 +52,7 @@ func main() {
 	go s.Serve(lis)
 	defer s.Stop()
 
-	/*****Initialize manual resolver and Dial *****/
+	/***** Initialize manual resolver and Dial *****/
 	r, rcleanup := manual.GenerateAndRegisterManualResolver()
 	defer rcleanup()
 	// Set up a connection to the server.
@@ -72,7 +72,7 @@ func main() {
 		name = os.Args[1]
 	}
 
-	// Make 100 SayHello RPCs.
+	/***** Make 100 SayHello RPCs *****/
 	for i := 0; i < 100; i++ {
 		// Setting a 150ms timeout on the RPC.
 		ctx, cancel := context.WithTimeout(context.Background(), 150*time.Millisecond)

diff --git a/main.go b/main.go
@@ -1,6 +1,6 @@
 /*
  *
- * Copyright 2015 gRPC authors.
+ * Copyright 2018 gRPC authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -36,22 +36,23 @@ import (
 )
 
 const (
-	address     = "localhost:50052"
 	defaultName = "world"
 )
 
 func main() {
+	/***** Set up the server serving channelz service. *****/
+	// TODO: delete TurnOn.
 	channelz.TurnOn()
 	lis, err := net.Listen("tcp", ":50051")
 	if err != nil {
 		log.Fatalf("failed to listen: %v", err)
 	}
-
 	s := grpc.NewServer()
 	service.RegisterChannelzServiceToServer(s)
 	go s.Serve(lis)
 	defer s.Stop()
 
+	/*****Initialize manual resolver and Dial *****/
 	r, rcleanup := manual.GenerateAndRegisterManualResolver()
 	defer rcleanup()
 	// Set up a connection to the server.
@@ -60,16 +61,20 @@ func main() {
 		log.Fatalf("did not connect: %v", err)
 	}
 	defer conn.Close()
+	// Manually provide resolved addresses for the target.
 	r.NewAddress([]resolver.Address{{Addr: ":10001"}, {Addr: ":10002"}, {Addr: ":10003"}})
+
 	c := pb.NewGreeterClient(conn)
 
 	// Contact the server and print out its response.
 	name := defaultName
 	if len(os.Args) > 1 {
 		name = os.Args[1]
 	}
-
+
+	// Make 100 SayHello RPCs.
 	for i := 0; i < 100; i++ {
+		// Setting a 150ms timeout on the RPC.
 		ctx, cancel := context.WithTimeout(context.Background(), 150*time.Millisecond)
 		defer cancel()
 		r, err := c.SayHello(ctx, &pb.HelloRequest{Name: name})
@@ -80,10 +85,11 @@ func main() {
 		}
 	}
 
+	// Wait for CTRL+C to exit.
+	// Unless you exit the program with CTRL+C, channelz data will be available for querying. 
+	// Users can take time to examine and learn about the info provided by channelz.
 	ch := make(chan os.Signal, 1)
 	signal.Notify(ch, os.Interrupt)
-
 	// Block until a signal is received.
 	sig := <-ch
-	fmt.Println("Got signal:", sig)
 }
diff --git a/main.go b/main.go
@@ -0,0 +1,89 @@
+/*
+ *
+ * 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
+
+import (
+	"fmt"
+	"log"
+	"net"
+	"os"
+	"os/signal"
+	"time"
+
+	"golang.org/x/net/context"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/channelz/service"
+	pb "google.golang.org/grpc/examples/helloworld/helloworld"
+	"google.golang.org/grpc/internal/channelz"
+	"google.golang.org/grpc/resolver"
+	"google.golang.org/grpc/resolver/manual"
+)
+
+const (
+	address     = "localhost:50052"
+	defaultName = "world"
+)
+
+func main() {
+	channelz.TurnOn()
+	lis, err := net.Listen("tcp", ":50051")
+	if err != nil {
+		log.Fatalf("failed to listen: %v", err)
+	}
+
+	s := grpc.NewServer()
+	service.RegisterChannelzServiceToServer(s)
+	go s.Serve(lis)
+	defer s.Stop()
+
+	r, rcleanup := manual.GenerateAndRegisterManualResolver()
+	defer rcleanup()
+	// Set up a connection to the server.
+	conn, err := grpc.Dial(r.Scheme()+":///test.server", grpc.WithInsecure(), grpc.WithBalancerName("round_robin"))
+	if err != nil {
+		log.Fatalf("did not connect: %v", err)
+	}
+	defer conn.Close()
+	r.NewAddress([]resolver.Address{{Addr: ":10001"}, {Addr: ":10002"}, {Addr: ":10003"}})
+	c := pb.NewGreeterClient(conn)
+
+	// Contact the server and print out its response.
+	name := defaultName
+	if len(os.Args) > 1 {
+		name = os.Args[1]
+	}
+
+	for i := 0; i < 100; i++ {
+		ctx, cancel := context.WithTimeout(context.Background(), 150*time.Millisecond)
+		defer cancel()
+		r, err := c.SayHello(ctx, &pb.HelloRequest{Name: name})
+		if err != nil {
+			log.Printf("could not greet: %v", err)
+		} else {
+			log.Printf("Greeting: %s", r.Message)
+		}
+	}
+
+	ch := make(chan os.Signal, 1)
+	signal.Notify(ch, os.Interrupt)
+
+	// Block until a signal is received.
+	sig := <-ch
+	fmt.Println("Got signal:", sig)
+}