Add client and server example

README.md

@@ -7,6 +7,7 @@ Gorilla WebSocket is a [Go](http://golang.org/) implementation of the
 
 * [API Reference](http://godoc.org/github.com/gorilla/websocket)
 * [Chat example](https://github.com/gorilla/websocket/tree/master/examples/chat)
+* [Client and server example](https://github.com/gorilla/websocket/tree/master/examples/echo)
 * [File watch example](https://github.com/gorilla/websocket/tree/master/examples/filewatch)
 
 ### Status

examples/echo/README.md

@@ -0,0 +1,15 @@
+# Client and server example
+
+This example shows a simple client and server.
+
+The server echoes messages sent to it. The client sends a message every five
+seconds and prints all messages received.
+
+To run the example, start the server:
+
+    $ go run server.go
+
+Next, start the client:
+
+    $ go run client.go
+

examples/echo/client.go

@@ -0,0 +1,55 @@
+// Copyright 2013 The Gorilla WebSocket Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	"flag"
+	"log"
+	"net/url"
+	"time"
+
+	"github.com/gorilla/websocket"
+)
+
+var addr = flag.String("addr", "localhost:8081", "http service address")
+
+var dialer = websocket.Dialer{} // use default options
+
+func main() {
+	flag.Parse()
+	log.SetFlags(0)
+
+	u := url.URL{Scheme: "ws", Host: *addr, Path: "/"}
+	log.Printf("connecting to %s", u.String())
+
+	c, _, err := dialer.Dial(u.String(), nil)
+	if err != nil {
+		log.Fatal("dial:", err)
+	}
+	defer c.Close()
+
+	go func() {
+		defer c.Close()
+		for {
+			_, message, err := c.ReadMessage()
+			if err != nil {
+				log.Println("read:", err)
+				break
+			}
+			log.Printf("recv: %s", message)
+		}
+	}()
+
+	ticker := time.NewTicker(5 * time.Second)
+	defer ticker.Stop()
+
+	for t := range ticker.C {
+		err := c.WriteMessage(websocket.TextMessage, []byte(t.String()))
+		if err != nil {
+			log.Println("write:", err)
+			break
+		}
+	}
+}

examples/echo/server.go

@@ -0,0 +1,58 @@
+// Copyright 2013 The Gorilla WebSocket Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	"flag"
+	"log"
+	"net/http"
+
+	"github.com/gorilla/websocket"
+)
+
+var addr = flag.String("addr", "localhost:8081", "http service address")
+
+var upgrader = websocket.Upgrader{} // use default options
+
+func echo(w http.ResponseWriter, r *http.Request) {
+	if r.URL.Path != "/" {
+		http.Error(w, "Not found", 404)
+		return
+	}
+	if r.Method != "GET" {
+		http.Error(w, "Method not allowed", 405)
+		return
+	}
+	c, err := upgrader.Upgrade(w, r, nil)
+	if err != nil {
+		log.Print("upgrade:", err)
+		return
+	}
+	defer c.Close()
+	for {
+		mt, message, err := c.ReadMessage()
+		if err != nil {
+			log.Println("read:", err)
+			break
+		}
+		log.Printf("recv: %s", message)
+		err = c.WriteMessage(mt, message)
+		if err != nil {
+			log.Println("write:", err)
+			break
+		}
+	}
+}
+
+func main() {
+	flag.Parse()
+	log.SetFlags(0)
+
+	http.HandleFunc("/", echo)
+	err := http.ListenAndServe(*addr, nil)
+	if err != nil {
+		log.Fatal("ListenAndServe: ", err)
+	}
+}