python websocket Django 实时消息推送

python websocket Django 实时消息推送

概述:

WebSocket 是什么

WebSocket 是 HTML5 提供的一种浏览器与服务器间进行全双工通讯的协议。依靠这种协议可以实现客户端和服务器端 ,一次握手,双向实时通信.

WebSocket 客户端:

<!DOCKTYPE html>
<html>
<head>
{% load static %}
//<link rel="stylesheet" type="text/css" href="{% static 'iziToast/css/iziToast.min.css' %}">
//<script type="text/javascript" src="{% static 'iziToast/js/iziToast.min.js' %}"></script>
// <script type="text/javascript" src="{% static 'iziToast/js/websocket.js' %}"></script>
<title>django-websocket</title>
<script src="http://code.jquery.com/jquery-1.11.1.min.js"></script>
<script type="text/javascript">//<![CDATA[
$(function () {
var websocket;
var name= '{{username}}';
 // 首先判断是否 支持 WebSocket  name身份标识  我当前用的 用户名,
if('WebSocket' in window) {

    websocket = new WebSocket("ws://localhost:8000/websocketLink/"+name);
} else if('MozWebSocket' in window) {
    websocket = new MozWebSocket("ws://localhost:8000/websocketLink/"+name);
} else {
    websocket = new SockJS("ws://localhost:8000/websocketLink/"+name);
}
    // 打开连接时    formatMsg是我自定义的消息提示
    websocket.onopen = function(event) {
         //formatMsg("系统提示:","您已连接 ,消息提示系统!!",2000)
        alert("您已连接 ,消息提示系统!!")
    };
    //发送消息
    $('#send_message').click(function () {
        if(!websocket){
            alert("Please connect server.");
        }else{
          //websocket.send($('#message').val()); //发送字符串数据类型
            websocket.send(JSON.stringify({'title': '通知', 'data': $('#message').val(), 'url': null}));//发送json数据类型
        }
    });
// 收到消息时
websocket.onmessage = function(event) {
    var data =JSON.parse(event.data);
   // formatMsg(data.title,data.data,10000)
        alert(data.data)

};
// 错误时
websocket.onerror = function(event) {
    console.log("  websocket.onerror  ");
};
// 断开连接时
websocket.onclose = function(event) {
      //formatMsg("系统提示:","已断开服务器,无法接收消息提示(请重新刷新页面)",2000)
    alert("已断开服务器,无法接收消息提示(请重新刷新页面)")
};
        //关闭websocket连接
    $('#close_websocket').click(function () {
        if(websocket){
            websocket.close();
        }
    });
});
function formatMsg(title,data,time) {
            iziToast.show({
        color: 'dark',
        icon: 'icon-contacts',
        title: title,
        message: data,
        timeout: time,

        position: 'topCenter',
        transitionIn: 'flipInX',
        transitionOut: 'flipOutX',
        progressBarColor: 'rgb(0, 255, 184)',
        image: 'img/avatar.jpg',
        imageWidth: 70,
        layout:2,
        onClose: function(){
            console.info('onClose');
        },
        iconColor: 'rgb(0, 255, 184)'
    });
}
</script>
</head>
<body>
<br>
<input type="text" id="message" value="Hello, World!" />
<button type="button" id="send_message">发送消息</button>
<button type="button" id="close_websocket">关闭websocket</button>
</body>
</html>

WebSocket 服务端:

用的是 dwebsocket

需要手动导入 不是pip安装  工具类  Django 项目不需要 配置 settings.py  INSTALLED_APPS

dwebsocket下载地址:
https://download.csdn.net/download/xianailili/10633275

urls.py

#  (?P<username>\w+)  设置必传参数 支持中文

url(r'websocketLink/(?P<username>\w+)', websocket.websocketLink# webSocket 链接

views.py

import threading

from dwebsocket.decorators import accept_websocket

# 存储连接websocket的用户

clients = {}

# 记录连接人数   其实没什么卵用  = =

count = 0

# 连接websocket  ws://localhost:8000/websocketLink/22

# 因为 websocket 是协议  所以不能用 http或https

@accept_websocket

def websocketLink(request, username):

    ‘连接websocket’

    global count

    # 获取连接

    if request.is_websocket:

        lock = threading.RLock()#rlock线程锁

        try:

            lock.acquire()#抢占资源

            s = {}

            #  因为同一个账号打开多个页面连接信息是不同的

            if clients.get(username) != None:

                # 连接信息  键 连接名  值:连接保存

                s[str(request.websocket)] = request.websocket

                # 已存在的连接信息继续增加

                clients[username].update(s)

            else:

                # 人数加1

                count = count + 1

                #  连接信息  键 连接名  值:连接保存

                s[str(request.websocket)] = request.websocket

                # 新增 用户  连接信息

                clients[username] = s

            print(“用户人数” + str(count))

            # 监听接收客户端发送的消息 或者 客户端断开连接

            for message in request.websocket:

                if not message:

                    break

                else:

                    request.websocket.send(message)

        finally:

                # 通过用户名找到 连接信息 再通过 连接信息 k 找到 v (k就是连接信息)

                clients.get(username).pop(str(request.websocket))

                #释放锁

                lock.release()

 # 发送消息

def websocketMsg(client, msg):

    import json

    # 因为一个账号会有多个页面打开 所以连接信息需要遍历

    for cli in client:

        ‘client客户端 ,msg消息’

        b1 = json.dumps(msg).encode(‘utf-8’)

        client[cli].send(b1)

# 服务端发送消息

def send(username, title, data, url):

    ‘username:用户名 title:消息标题 data:消息内容,消息内容:ulr’

    try:

        if clients[username]:

            websocketMsg(clients[username], {‘title’: title, ‘data’: data, ‘url’: url})

            # 根据业务需求 可有可无    数据做 持久化

            # messageLog = MessageLog(name=username, msg_title=title, msg=data, msg_url=url, is_required=0)

            flg = 1

        flg = -1

    except BaseException:

        # messageLog = MessageLog(name=username, msg_title=title, msg=data, msg_url=url, is_required=1)

        pass

    finally:

        pass

# messageLog.save()

models .py

#消息推送

class MessageLog(models.Model):
name = models.CharField(verbose_name=”用户名称”, max_length=100, blank=False, null=False)
msg =models.CharField(verbose_name=”消息”, max_length=100, blank=False, null=False)
msg_title = models.CharField(verbose_name=”消息标题”, max_length=100, blank=False, null=False)
msg_url = models.CharField(verbose_name=”消息url”, max_length=100, blank=False, null=False)
requiredText = ((0, ‘是’), (1, ‘否’))
is_required = models.IntegerField(verbose_name=’是否已读’, choices=requiredText, default=0)
create_time = models.DateTimeField(verbose_name=’创建时间’, auto_now_add=True) # auto_now_add:取新增时候的时间
update_time = models.DateTimeField(verbose_name=’修改时间’, auto_now=True) # 取每次更新的时间
def str(self):
return self.nam
class Meta:
verbose_name = “消息记录”
verbose_name_plural = “消息记录”
db_table = “m_message_log”




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