python2.7实现websocket服务器，能够在web实时显示远程服务器日志

1、开始的话

　　使用python实现websocket服务器，能够在浏览器上实时显示远程服务器的日志。

　　以前写了一个发布系统，每次发布版本后，为了了解发布状况（进度、是否有错误）都会登陆到服务器上查看日志，有点麻烦，若是发布的服务器比较多，难道要登陆到每台服务器去看日志吗？做为新时代的运维，太不能接收这种重复操做的体力劳动了，因而一个看日志的功能就这么诞生了。下面是效果图，页面丑陋不堪，将就着吧。

 

2、行动

　　打开页面时，自动链接websocket服务器，完成握手，并发送ip和type给服务端，因此能够看不一样类型，不一样机器上的日志，websocket服务器接收到信息后，去数据库查找对应的日志路径和主机帐号密码，而后起一个线程ssh登陆到远程服务器上tail查看日志，再推送给浏览器，代码以下：

  1 # coding:utf-8
  2 import os
  3 import struct
  4 import base64
  5 import hashlib
  6 import socket
  7 import threading
  8 import paramiko
  9 
 10 
 11 def get_ssh(ip, user, pwd):
 12     try:
 13         ssh = paramiko.SSHClient()
 14         ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
 15         ssh.connect(ip, 22, user, pwd, timeout=15)
 16         return ssh
 17     except Exception, e:
 18         print e
 19         return "False"
 20 
 21 
 22 def recv_data(conn):    # 服务器解析浏览器发送的信息
 23     try:
 24         all_data = conn.recv(1024)
 25         if not len(all_data):
 26             return False
 27     except:
 28         pass
 29     else:
 30         code_len = ord(all_data[1]) & 127
 31         if code_len == 126:
 32             masks = all_data[4:8]
 33             data = all_data[8:]
 34         elif code_len == 127:
 35             masks = all_data[10:14]
 36             data = all_data[14:]
 37         else:
 38             masks = all_data[2:6]
 39             data = all_data[6:]
 40         raw_str = ""
 41         i = 0
 42         for d in data:
 43             raw_str += chr(ord(d) ^ ord(masks[i % 4]))
 44             i += 1
 45         return raw_str
 46 
 47 
 48 def send_data(conn, data):   # 服务器处理发送给浏览器的信息
 49     if data:
 50         data = str(data)
 51     else:
 52         return False
 53     token = "\x81"
 54     length = len(data)
 55     if length < 126:
 56         token += struct.pack("B", length)    # struct为Python中处理二进制数的模块，二进制流为C，或网络流的形式。
 57     elif length <= 0xFFFF:
 58         token += struct.pack("!BH", 126, length)
 59     else:
 60         token += struct.pack("!BQ", 127, length)
 61     data = '%s%s' % (token, data)
 62     conn.send(data)
 63     return True
 64 
 65 
 66 def handshake(conn, address, thread_name):    # 握手创建链接  67     headers = {}
 68     shake = conn.recv(1024)
 69     if not len(shake):
 70         return False
 71 
 72     print ('%s : Socket start handshaken with %s:%s' % (thread_name, address[0], address[1]))
 73     header, data = shake.split('\r\n\r\n', 1)
 74     for line in header.split('\r\n')[1:]:
 75         key, value = line.split(': ', 1)
 76         headers[key] = value
 77 
 78     if 'Sec-WebSocket-Key' not in headers:
 79         print ('%s : This socket is not websocket, client close.' % thread_name)
 80         conn.close()
 81         return False
 82 
 83     MAGIC_STRING = '258EAFA5-E914-47DA-95CA-C5AB0DC85B11'
 84     HANDSHAKE_STRING = "HTTP/1.1 101 Switching Protocols\r\n" \
 85                        "Upgrade:websocket\r\n" \
 86                        "Connection: Upgrade\r\n" \
 87                        "Sec-WebSocket-Accept: {1}\r\n" \
 88                        "WebSocket-Origin: {2}\r\n" \
 89                        "WebSocket-Location: ws://{3}/\r\n\r\n"
 90 
 91     sec_key = headers['Sec-WebSocket-Key']
 92     res_key = base64.b64encode(hashlib.sha1(sec_key + MAGIC_STRING).digest())
 93     str_handshake = HANDSHAKE_STRING.replace('{1}', res_key).replace('{2}', headers['Origin']).replace('{3}', headers['Host'])
 94     conn.send(str_handshake)                 # 发送创建链接的信息  95     print ('%s : Socket handshaken with %s:%s success' % (thread_name, address[0], address[1]))
 96     print 'Start transmitting data...'
 97     print '- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -'
 98     return True
 99 
100 
101 def dojob(conn, address, thread_name):
102     handshake(conn, address, thread_name)     # 握手
103     conn.setblocking(0)                       # 设置socket为非阻塞
104 
105     ssh = get_ssh('192.168.1.1', 'root', '123456')   # 链接远程服务器（日志所在的服务器）
106     ssh_t = ssh.get_transport()
107     chan = ssh_t.open_session()
108     chan.setblocking(0)          # 设置非阻塞
109     chan.exec_command('tail -f /var/log/messages')   # 执行查看日志命令 110 
111     while True:            # 下面这个逻辑是在看日志时能中止或继续，写的有点混乱，还没想到优化的方案 112         clientdata = recv_data(conn)
113         if clientdata is not None and 'quit' in clientdata:    # 当浏览器点击stop按钮或close按钮时，断开链接
114             print ('%s : Socket close with %s:%s' % (thread_name, address[0], address[1]))
115             send_data(conn, 'close connect')
116             conn.close()
117             break
118         while True:
119             while chan.recv_ready():
120                 clientdata1 = recv_data(conn)
121                 if clientdata1 is not None and 'quit' in clientdata1:
122                     print ('%s : Socket close with %s:%s' % (thread_name, address[0], address[1]))
123                     send_data(conn, 'close connect')
124                     conn.close()
125                     break
126                 log_msg = chan.recv(10000).strip()    # 接收日志信息
127                 print log_msg
128                 send_data(conn, log_msg)
129             if chan.exit_status_ready():
130                 break
131             clientdata2 = recv_data(conn)
132             if clientdata2 is not None and 'quit' in clientdata2:
133                 print ('%s : Socket close with %s:%s' % (thread_name, address[0], address[1]))
134                 send_data(conn, 'close connect')
135                 conn.close()
136                 break
137         break
138 
139 
140 def ws_service():
141 
142     index = 1
143     sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
144     sock.bind(("127.0.0.1", 12345))
145     sock.listen(100)
146 
147     print ('\r\n\r\nWebsocket server start, wait for connect!')
148     print '- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -'
149     while True:
150         connection, address = sock.accept()
151         thread_name = 'thread_%s' % index
152         print ('%s : Connection from %s:%s' % (thread_name, address[0], address[1]))
153         t = threading.Thread(target=dojob, args=(connection, address, thread_name))
154         t.start()
155         index += 1
156 
157 
158 ws_service()

 

页面代码以下:

<!DOCTYPE html><html><head>    <title>WebSocket</title>    <style>    #log {        width: 440px;        height: 200px;        border: 1px solid #7F9DB9;        overflow: auto;    }    pre {        margin: 0 0 0;        padding: 0;        border: hidden;        background-color: #0c0c0c;        color: #00ff00;    }    #btns {        text-align: right;    }    </style>    <script>        var socket;        function init() {            var host = "ws://127.0.0.1:12345/";            try {                socket = new WebSocket(host);                socket.onopen = function () {                    log('Connected');                };                socket.onmessage = function (msg) {                    log(msg.data);                    var obje = document.getElementById("log");   //日志过多时清屏                    var textlength = obje.scrollHeight;                    if (textlength > 10000) {                        obje.innerHTML = '';                    }                };                socket.onclose = function () {                    log("Lose Connection!");                    $("#start").attr('disabled', false);                    $("#stop").attr('disabled', true);                };                $("#start").attr('disabled', true);                $("#stop").attr('disabled', false);            }            catch (ex) {                log(ex);            }        }        window.onbeforeunload = function () {            try {                socket.send('quit');                socket.close();                socket = null;            }            catch (ex) {                log(ex);            }        };        function log(msg) {            var obje = document.getElementById("log");            obje.innerHTML += '<pre><code>' + msg + '</code></pre>';            obje.scrollTop = obje.scrollHeight;   //滚动条显示最新数据        }        function stop() {            try {                log('Close connection!');                socket.send('quit');                socket.close();                socket = null;                $("#start").attr('disabled', false);                $("#stop").attr('disabled', true);            }            catch (ex) {                log(ex);            }        }        function closelayer() {            try {                log('Close connection!');                socket.send('quit');                socket.close();                socket = null;            }            catch (ex) {                log(ex);            }            var index = parent.layer.getFrameIndex(window.name); //先获得当前iframe层的索引            parent.layer.close(index); //再执行关闭        }    </script></head><body onload="init()">    <div class="row">        <div class="col-lg-12">            <div id="log" style="width: 100%;height:440px;background-color: #0c0c0c;overflow:scroll;overflow-x: auto;"></div>            <br>        </div>    </div>    <div class="row">        <div class="col-lg-12">            <div id="btns">                <input disabled="disabled" type="button" class="btn btn-primary btn-sm" value="start" id="start" onclick="init()">                <input disabled="disabled" type="button" class="btn btn-primary btn-sm" value="stop" id="stop" onclick="stop()" >                <input type="button" class="btn btn-primary btn-sm" value="close" id="close" onclick="closelayer()" >            </div>        </div>    </div></body></html>