欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  IT编程

python制作websocket服务器实例分享

程序员文章站 2023-12-20 18:33:58
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...

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。

python制作websocket服务器实例分享

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,

python制作websocket服务器实例分享

 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>

以上就是本文的全部内容了,希望大家能够喜欢

上一篇:

下一篇: