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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