python制作websocket服務器實例分享

2019-11-25 16:29:06

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一、開始的話

　　使用python簡單的實現websocket服務器，可以在瀏覽器上實時顯示遠程服務器的日志信息。

　　之前做了一個web版的發布系統，但沒實現在線看日志，每次發布版本后，都需要登錄到服務器上查看日志，非常麻煩，為了偷懶，能在頁面點幾下按鈕完成工作，這幾天查找了這方面的資料，實現了這個功能，瞬間覺的看日志什么的，太方便了，以后也可以給開發們查日志，再也不用麻煩運維了，廢話少說，先看效果吧。

二、代碼

　　需求：在web上彈出iframe層來實時顯示遠程服務器的日志，點擊stop按鈕，停止日志輸出，以便查看相關日志，點start按鈕，繼續輸出日志，點close按鈕，關閉iframe層。

　　在實現這功能前，google了一些資料，發現很多只能在web上顯示本地的日志，不能看遠程服務器的日志，能看遠程日志的是引用了其他框架（例如bottle，tornado）來實現的，而且所有這些都是要重寫thread的run方法來實現的，由于本人技術太菜，不知道怎么改成自己需要的樣子，而且我是用django這個web框架的，不想引入其他框架，搞的太復雜，所以用python簡單的實現websocket服務器。recv_data方法和send_data是直接引用別人的代碼。由于技術問題，代碼有點粗糙，不過能實現功能就行，先將就著用吧。

執行下面命令啟動django和websocketserver

nohup python manage.py runserver 10.1.12.110 &nohup python websocketserver.py &

　　啟動websocket后，接收到請求，起一個線程和客戶端握手，然后根據客戶端發送的ip和type，去數據庫查找對應的日志路徑，用paramiko模塊ssh登錄到遠程服務器上tail查看日志，再推送給瀏覽器，服務端完整代碼如下：

# coding:utf-8import osimport structimport base64import hashlibimport socketimport threadingimport paramikodef 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):  # 服務器解析瀏覽器發送的信息  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_strdef send_data(conn, data):  # 服務器處理發送給瀏覽器的信息  if data:    data = str(data)  else:    return False  token = "/x81"  length = len(data)  if length < 126:    token += struct.pack("B", length)  # struct為Python中處理二進制數的模塊，二進制流為C，或網絡流的形式。  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 Truedef 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 Truedef dojob(conn, address, thread_name):  handshake(conn, address, thread_name)   # 握手  conn.setblocking(0)            # 設置socket為非阻塞  ssh = get_ssh('192.168.1.1', 'root', '123456')  # 連接遠程服務器  ssh_t = ssh.get_transport()  chan = ssh_t.open_session()  chan.setblocking(0)  # 設置非阻塞  chan.exec_command('tail -f /var/log/messages')  while True:    clientdata = recv_data(conn)    if clientdata is not None and 'quit' in clientdata:  # 但瀏覽器點擊stop按鈕或close按鈕時，斷開連接      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    breakdef 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 += 1ws_service()

get_ssh的代碼如下：

import paramikodef 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"

打開頁面時，自動連接websocket服務器，完成握手，并發送ip和type給服務端，所以可以看不同類型，不同機器上的日志，

頁面代碼如下:

<!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");  //日志過多時清屏
          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;  //滾動條顯示最新數據
    }
    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); //先得到當前iframe層的索引
      parent.layer.close(index); //再執行關閉
    }
  </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>