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python3 实现多人websocket聊天室

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python 版本：python3.7.4

前端网页

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
</head>
<body>
    <div>
        <h3>昵称：<input type="text" id="user"/></h3>
        <input type="text" value="说：" id="say" hidden/>
        <h3>发送消息：</h3><input type="text" id="txt" style="height: 100px;width: 200px"/><br>
        <input type="button" id="btn" value="提交" style="height: 30px" onclick="sendMsg();"/>
        <input type="reset" value="reset" onclick=location="websocket.html">
        <input type="button" id="close" value="关闭连接" onclick="closeConn();"/>
    </div>
    <div id="content"></div>

<script type="text/javascript">
    var socket = new WebSocket("ws://127.0.0.1:9999/chatsocket");
    socket.onopen = function () {
        var newTag = document.createElement('div');
        newTag.innerHTML = "【连接成功】";
        document.getElementById('content').appendChild(newTag);
    };
    socket.onmessage = function (event) {
        var response = event.data;
        var newTag = document.createElement('div');
        newTag.innerHTML = response;
        document.getElementById('content').appendChild(newTag);
    };
    socket.onclose = function (event) {
        var newTag = document.createElement('div');
        newTag.innerHTML = "【连接失败】";
        document.getElementById('content').appendChild(newTag);
    };
    function sendMsg() {
        var txt = document.getElementById('txt');
        var user = document.getElementById('user');
        var say = document.getElementById('say');
        socket.send(user.value+say.value+txt.value);
        txt.value = "";
    }
    function closeConn() {
        socket.close();
        var newTag = document.createElement('div');
        newTag.innerHTML = "【关闭连接】";
        document.getElementById('content').appendChild(newTag);
    }
</script>
</body>
</html>

后端python代码：

from socket import *
import socket
import base64
import hashlib
import threading

def get_headers(data):
    header_dict = {}
    data = str(data, encoding='utf-8')
    header, body = data.split('\r\n\r\n', 1)
    header_list = header.split('\r\n')
    for i in range(0, len(header_list)):
        if i == 0:
            if len(header_list[i].split(' ')) == 3:
                header_dict['method'], header_dict['url'], header_dict['protocol'] = header_list[i].split(' ')
        else:
            k, v = header_list[i].split(':', 1)
            header_dict[k] = v.strip()
    return header_dict

def send_msg(conn, msg_bytes):
    import struct
    token = b"\x81"
    length = len(msg_bytes)
    if length < 126:
        token += struct.pack("B", length)
    elif length <= 0xFFFF:
        token += struct.pack("!BH", 126, length)
    else:
        token += struct.pack("!BQ", 127, length)
    msg = token + msg_bytes
    conn.send(msg)
    return True

class Chat:
    def __init__(self,ip='0.0.0.0',port=9999):
        self.addr=(ip,port)
        self.sock=socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
        self.client= {}

    def start(self,):
        self.sock.bind((self.addr))
        self.sock.listen()
        threading.Thread(target=self.accept,name='accept').start()

    def accept(self):
        while True:
            conn, address = self.sock.accept()
            self.client[address] = conn

            data = conn.recv(1024)
            headers = get_headers(data)
            response_tpl = "HTTP/1.1 101 Switching Protocols\r\n" \
                           "Upgrade:websocket\r\n" \
                           "Connection: Upgrade\r\n" \
                           "Sec-WebSocket-Accept: %s\r\n" \
                           "WebSocket-Location: ws://%s%s\r\n\r\n"
            magic_string = '258EAFA5-E914-47DA-95CA-C5AB0DC85B11'
            value = headers['Sec-WebSocket-Key'] + magic_string
            ac = base64.b64encode(hashlib.sha1(value.encode('utf-8')).digest())
            response_str = response_tpl % (ac.decode('utf-8'), headers['Host'], headers['url'])
            conn.send(bytes(response_str, encoding='utf-8'))

            threading.Thread(target=self.recv,name='sock',args=(conn,)).start()

    def recv(self,sock):
        while 1:
            try:
                info = sock.recv(8096)
            except Exception as e:
                info = None
            if not info:
                break
            payload_len = info[1] & 127
            if payload_len == 126:
                extend_payload_len = info[2:4]
                mask = info[4:8]
                decoded = info[8:]
            elif payload_len == 127:
                extend_payload_len = info[2:10]
                mask = info[10:14]
                decoded = info[14:]
            else:
                extend_payload_len = None
                mask = info[2:6]
                decoded = info[6:]
            bytes_list = bytearray()
            for i in range(len(decoded)):
                chunk = decoded[i] ^ mask[i % 4]
                bytes_list.append(chunk)
            body = str(bytes_list, encoding='utf-8')
            for s in self.client.values():
                send_msg(s, bytes(body, encoding='utf-8'))

    def stop(self):
        for s in self.client.values():
            s.close()
        self.sock.close()

sc=Chat()
sc.start()

使用9999端口，启用脚本时确保端口没有被占用

测试：

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