From 0aecb0d5883f47e12fb2f35ac9661f2e29dc7f0a Mon Sep 17 00:00:00 2001
From: marjune <marjune@163.com>
Date: Fri, 19 Jul 2019 11:52:06 +0800
Subject: [PATCH] add chapter 15.11 (#688)

---
 eBook/15.11.md                                | 80 +++++++++++++++++++
 eBook/examples/chapter_15/websocket_client.go | 29 +++++++
 eBook/examples/chapter_15/websocket_server.go | 29 +++++++
 3 files changed, 138 insertions(+)
 create mode 100644 eBook/15.11.md
 create mode 100644 eBook/examples/chapter_15/websocket_client.go
 create mode 100644 eBook/examples/chapter_15/websocket_server.go

diff --git a/eBook/15.11.md b/eBook/15.11.md
new file mode 100644
index 0000000..b7a7118
--- /dev/null
+++ b/eBook/15.11.md
@@ -0,0 +1,80 @@
+# 15.11 与 websocket 通信
+
+备注：Go 团队决定从 Go 1 起，将 `websocket`  包移出 Go 标准库，转移到 `code.google.com/p/go` 下的子项目 `websocket`，同时预计近期将做重大更改。
+
+`import "websocket"` 这行要改成：
+```go
+import websocket "code.google.com/p/go/websocket"
+```
+
+与 http 协议相反，websocket 是通过客户端与服务器之间的对话，建立的基于单个持久连接的协议。然而在其他方面，其功能几乎与 http 相同。在示例 15.24 中，我们有一个典型的 websocket 服务器，他会自启动并监听 websocket 客户端的连入。示例 15.25 演示了 5 秒后会终止的客户端代码。当连接到来时，服务器先打印 `new connection`，当客户端停止时，服务器打印 `EOF => closing connection`。
+
+示例 15.24 [websocket_server.go](examples/chapter_15/websocket_server.go)
+```go
+package main
+
+import (
+	"fmt"
+	"net/http"
+	"websocket"
+)
+
+func server(ws *websocket.Conn) {
+	fmt.Printf("new connection\n")
+	buf := make([]byte, 100)
+	for {
+		if _, err := ws.Read(buf); err != nil {
+			fmt.Printf("%s", err.Error())
+			break
+		}
+	}
+	fmt.Printf(" => closing connection\n")
+	ws.Close()
+}
+
+func main() {
+	http.Handle("/websocket", websocket.Handler(server))
+	err := http.ListenAndServe(":12345", nil)
+	if err != nil {
+		panic("ListenAndServe: " + err.Error())
+	}
+}
+```
+
+示例 15.25 [websocket_client.go](examples/chapter_15/websocket_client.go)
+```go
+package main
+
+import (
+	"fmt"
+	"time"
+	"websocket"
+)
+
+func main() {
+	ws, err := websocket.Dial("ws://localhost:12345/websocket", "",
+		"http://localhost/")
+	if err != nil {
+		panic("Dial: " + err.Error())
+	}
+	go readFromServer(ws)
+	time.Sleep(5e9)
+    ws.Close()
+}
+
+func readFromServer(ws *websocket.Conn) {
+	buf := make([]byte, 1000)
+	for {
+		if _, err := ws.Read(buf); err != nil {
+			fmt.Printf("%s\n", err.Error())
+			break
+		}
+	}
+}
+```
+
+## 链接
+
+- [目录](directory.md)
+- 上一节：[基于网络的通道 netchan](15.10.md)
+- 下一节：[用 smtp 发送邮件](15.12.md)
diff --git a/eBook/examples/chapter_15/websocket_client.go b/eBook/examples/chapter_15/websocket_client.go
new file mode 100644
index 0000000..a35fa12
--- /dev/null
+++ b/eBook/examples/chapter_15/websocket_client.go
@@ -0,0 +1,29 @@
+// websocket_client.go
+package main
+
+import (
+	"fmt"
+	"time"
+	"code.google.com/p/go.net/websocket"
+)
+
+func main() {
+	ws, err := websocket.Dial("ws://localhost:12345/websocket", "",
+		"http://localhost/")
+	if err != nil {
+		panic("Dial: " + err.Error())
+	}
+	go readFromServer(ws)
+	time.Sleep(5e9)
+    ws.Close()
+}
+
+func readFromServer(ws *websocket.Conn) {
+	buf := make([]byte, 1000)
+	for {
+		if _, err := ws.Read(buf); err != nil {
+			fmt.Printf("%s\n", err.Error())
+			break
+		}
+	}
+}
diff --git a/eBook/examples/chapter_15/websocket_server.go b/eBook/examples/chapter_15/websocket_server.go
new file mode 100644
index 0000000..f445fc7
--- /dev/null
+++ b/eBook/examples/chapter_15/websocket_server.go
@@ -0,0 +1,29 @@
+// websocket_server.go
+package main
+
+import (
+	"fmt"
+	"net/http"
+	"code.google.com/p/go.net/websocket"
+)
+
+func server(ws *websocket.Conn) {
+	fmt.Printf("new connection\n")
+	buf := make([]byte, 100)
+	for {
+		if _, err := ws.Read(buf); err != nil {
+			fmt.Printf("%s", err.Error())
+			break
+		}
+	}
+	fmt.Printf(" => closing connection\n")
+	ws.Close()
+}
+
+func main() {
+	http.Handle("/websocket", websocket.Handler(server))
+	err := http.ListenAndServe(":12345", nil)
+	if err != nil {
+		panic("ListenAndServe: " + err.Error())
+	}
+}