python制作websocket服务器实例分享


            一、开始的话

　　使用python简单的实现websocket服务器，可以在浏览器上实时显示远程服务器的日志信息。

　　之前做了一个web版的发布系统，但没实现在线看日志，每次发布版本后，都需要登录到服务器上查看日志，非常麻烦，为了偷懒，能在页面点几下按钮完成工作，这几天查找了这方面的资料，实现了这个功能，瞬间觉的看日志什么的，太方便了，以后也可以给开发们查日志，再也不用麻烦运维了，废话少说，先看效果吧。



二、代码

　　需求：在web上弹出iframe层来实时显示远程服务器的日志，点击stop按钮，停止日志输出，以便查看相关日志，点start按钮，继续输出日志，点close按钮，关闭iframe层。

　　在实现这功能前，google了一些资料，发现很多只能在web上显示本地的日志，不能看远程服务器的日志，能看远程日志的是引用了其他框架（例如bottle，tornado）来实现的，而且所有这些都是要重写thread的run方法来实现的，由于本人技术太菜，不知道怎么改成自己需要的样子，而且我是用django这个web框架的，不想引入其他框架，搞的太复杂，所以用python简单的实现websocket服务器。recv_data方法和send_data是直接引用别人的代码。由于技术问题，代码有点粗糙，不过能实现功能就行，先将就着用吧。

执行下面命令启动django和websocketserver





nohup python manage.py runserver 10.1.12.110 &

nohup python websocketserver.py &





　　启动websocket后，接收到请求，起一个线程和客户端握手，然后根据客户端发送的ip和type，去数据库查找对应的日志路径，用paramiko模块ssh登录到远程服务器上tail查看日志，再推送给浏览器，服务端完整代码如下：





# coding:utf-8

import os

import struct

import base64

import hashlib

import socket

import threading

import paramiko





def get_ssh(ip, user, pwd):

  try:

    ssh = paramiko.SSHClient()

    ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())

    ssh.connect(ip, 22, user, pwd, timeout=15)

    return ssh

  except Exception, e:

    print e

    return "False"





def recv_data(conn):  # 服务器解析浏览器发送的信息

  try:

    all_data = conn.recv(1024)

    if not len(all_data):

      return False

  except:

    pass

  else:

    code_len = ord(all_data[1]) & 127

    if code_len == 126:

      masks = all_data[4:8]

      data = all_data[8:]

    elif code_len == 127:

      masks = all_data[10:14]

      data = all_data[14:]

    else:

      masks = all_data[2:6]

      data = all_data[6:]

    raw_str = ""

    i = 0

    for d in data:

      raw_str += chr(ord(d) ^ ord(masks[i % 4]))

      i += 1

    return raw_str





def send_data(conn, data):  # 服务器处理发送给浏览器的信息

  if data:

    data = str(data)

  else:

    return False

  token = "\x81"

  length = len(data)

  if length < 126:

    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。

  elif length <= 0xFFFF:

    token += struct.pack("!BH", 126, length)

  else:

    token += struct.pack("!BQ", 127, length)

  data = '%s%s' % (token, data)

  conn.send(data)

  return True





def handshake(conn, address, thread_name):

  headers = {}

  shake = conn.recv(1024)

  if not len(shake):

    return False



  print ('%s : Socket start handshaken with %s:%s' % (thread_name, address[0], address[1]))

  header, data = shake.split('\r\n\r\n', 1)

  for line in header.split('\r\n')[1:]:

    key, value = line.split(': ', 1)

    headers[key] = value



  if 'Sec-WebSocket-Key' not in headers:

    print ('%s : This socket is not websocket, client close.' % thread_name)

    conn.close()

    return False



  MAGIC_STRING = '258EAFA5-E914-47DA-95CA-C5AB0DC85B11'

  HANDSHAKE_STRING = "HTTP/1.1 101 Switching Protocols\r\n" \

            "Upgrade:websocket\r\n" \

            "Connection: Upgrade\r\n" \

            "Sec-WebSocket-Accept: {1}\r\n" \

            "WebSocket-Origin: {2}\r\n" \

            "WebSocket-Location: ws://{3}/\r\n\r\n"



  sec_key = headers['Sec-WebSocket-Key']

  res_key = base64.b64encode(hashlib.sha1(sec_key + MAGIC_STRING).digest())

  str_handshake = HANDSHAKE_STRING.replace('{1}', res_key).replace('{2}', headers['Origin']).replace('{3}', headers['Host'])

  conn.send(str_handshake)

  print ('%s : Socket handshaken with %s:%s success' % (thread_name, address[0], address[1]))

  print 'Start transmitting data...'

  print '- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -'

  return True





def dojob(conn, address, thread_name):

  handshake(conn, address, thread_name)   # 握手

  conn.setblocking(0)            # 设置socket为非阻塞



  ssh = get_ssh('192.168.1.1', 'root', '123456')  # 连接远程服务器

  ssh_t = ssh.get_transport()

  chan = ssh_t.open_session()

  chan.setblocking(0)  # 设置非阻塞

  chan.exec_command('tail -f /var/log/messages')



  while True:

    clientdata = recv_data(conn)

    if clientdata is not None and 'quit' in clientdata:  # 但浏览器点击stop按钮或close按钮时，断开连接

      print ('%s : Socket close with %s:%s' % (thread_name, address[0], address[1]))

      send_data(conn, 'close connect')

      conn.close()

      break

    while True:

      while chan.recv_ready():

        clientdata1 = recv_data(conn)

        if clientdata1 is not None and 'quit' in clientdata1:

          print ('%s : Socket close with %s:%s' % (thread_name, address[0], address[1]))

          send_data(conn, 'close connect')

          conn.close()

          break

        log_msg = chan.recv(10000).strip()  # 接收日志信息

        print log_msg

        send_data(conn, log_msg)

      if chan.exit_status_ready():

        break

      clientdata2 = recv_data(conn)

      if clientdata2 is not None and 'quit' in clientdata2:

        print ('%s : Socket close with %s:%s' % (thread_name, address[0], address[1]))

        send_data(conn, 'close connect')

        conn.close()

        break

    break





def ws_service():



  index = 1

  sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

  sock.bind(("127.0.0.1", 12345))

  sock.listen(100)



  print ('\r\n\r\nWebsocket server start, wait for connect!')

  print '- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -'

  while True:

    connection, address = sock.accept()

    thread_name = 'thread_%s' % index

    print ('%s : Connection from %s:%s' % (thread_name, address[0], address[1]))

    t = threading.Thread(target=dojob, args=(connection, address, thread_name))

    t.start()

    index += 1





ws_service()



get_ssh的代码如下：



import paramiko

def get_ssh(ip, user, pwd):

  try:

    ssh = paramiko.SSHClient()

    ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())

    ssh.connect(ip, 22, user, pwd, timeout=15)

    return ssh

  except Exception, e:

    print e

    return "False"

打开页面时，自动连接websocket服务器，完成握手，并发送ip和type给服务端，所以可以看不同类型，不同机器上的日志，



 页面代码如下:



<!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); //先得到当前iframe层的索引      parent.layer.close(index); //再执行关闭    }  </script></head><body onload="init()">  <div >    <div >      <div id="log" ></div>      <br>    </div>  </div>  <div >    <div >      <div id="btns">        <input disabled="disabled" type="button" value="start" id="start" onclick="init()">        <input disabled="disabled" type="button" value="stop" id="stop" onclick="stop()" >        <input type="button" value="close" id="close" onclick="closelayer()" >      </div>    </div>  </div></body></html>

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