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python+socket+jq实现web页面实时输出结果

例如有这样一个需求:

在终端上进行ping操作,现在想把这个这个操作放到web页面上进行,并且实现实时输出的效果。

 

来分析下具体实现过程

 

第一步,传统的http请求实现这个有点不太友好,因为这里边是一个请求,请求中间隔输出结果。  可以使用长轮询,这个以后再研究。

这种情况用websocket比较好。

 

然后再来解决几个疑惑,

怎么去写服务端的websocket?

方法: 这个选择比较多,python的很多框架里边都带有websocket模块,例如gevent-websocket,dwebsocket,flask_sockets

但是使用api却有不同,其实这些都是对socket进行来新的封装,所以这里用最原始的socket进行编程。

 

怎么发送websocket请求?

方法:发送websocket请求这个方法也比较多,有专门的第三方模块,例如websocket_client,jquery。这次是打算在web页面上显示,所以用jquery自带的api来请求服务端。

 

WebSocket 和 Socket 的区别,websocket 能连 socket 吗

方法:就像Java和JavaScript,并没有什么太大的关系,但又不能说完全没关系。可以这么说,socket并不是一个协议,而是抽象出来的一层,应用于应用层和传输控制层之间的一组接口,socket是传输控制层协议,websocket是应用层协议。 jquery自带的api能有直接请求socket。

 

下边就直接上代码了

服务端:

#!/usr/bin/env python
# -*- coding:utf-8 -*-
import socket
import base64
import hashlib


def get_headers(data):
    """
    将请求头格式化成字典
    :param data:
    :return:
    """
    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):
    """
    WebSocket服务端向客户端发送消息
    :param conn: 客户端连接到服务器端的socket对象,即: conn,address = socket.accept()
    :param msg_bytes: 向客户端发送的字节
    :return:
    """
    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


def run():
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
    sock.bind(('0.0.0.0', 8003))
    sock.listen(5)

    conn, address = sock.accept()
    print(address)
    data = conn.recv(1024)
    print(data)
    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"

    value = headers['Sec-WebSocket-Key'] + '258EAFA5-E914-47DA-95CA-C5AB0DC85B11'
    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'))

    while True:
        try:
            info = conn.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')

        import subprocess
        p = subprocess.Popen('ping -c5 www.baidu.com', shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
        lines = []
        for line in iter(p.stdout.readline, b''):
            line = line.rstrip().decode('utf8')
            send_msg(conn, line.encode('utf-8'))

    sock.close()


if __name__ == '__main__':
    run()
View Code

客户端:

<!DOCTYPE html >
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
    <script src="jquery-2.1.4.min.js"></script>
    <script type="text/javascript">
    $(function () {
        var socket = new WebSocket("ws://127.0.0.1:8003");
        $('#backup_all').click(function () {
            console.log(window.location.host)
            console.log(socket);
            // socket.onopen = function () {
            //     console.log('WebSocket open');//成功连接上Websocket
            //     socket.send('ls');//发送数据到服务端
            // };
            socket.send('ls');
                console.log('WebSocket open');//成功连接上Websocket

            socket.onmessage = function (e) {
                console.log('message: ' + e.data);//打印服务端返回的数据
                //$('#messagecontainer').prepend('<p><pre>' + e.data + '</pre></p>');
                //$('#messagecontainer').prepend('<hr />');
                $('#messagecontainer').append(e.data+'<br/>');

            };
        });
    });
    </script>
</head>
<body>

<button style="margin: 20px;height: 40px;background-color: #00ff00;" type="button" id="backup_all" value="backup_all">
    执行Shell脚本
</button>
<h3 style="margin: 20px;">脚本执行结果:</h3>
<div id="messagecontainer" style="margin: 20px;">
</div>
<hr/>
</body>
</html>
View Code

结果:

 

https://www.cnblogs.com/ssyfj/p/9245150.html

https://yq.aliyun.com/articles/656918

https://www.cnblogs.com/mengqingjian/p/8530994.html

posted @ 2019-08-09 10:39  神雕爱大侠  阅读(1725)  评论(0编辑  收藏  举报