python实战--Http代理服务器
python实战--Http代理服务器
打算好好深入研究下pytho的socket编程， 于是打算学习下，仿写了一下，发现写好还真不容易，中途出现很多问题，果真是看的容易，做起来难啊。
源代码如下：
[python]
import socket
import thread
import urlparse
import select
BUFLEN=8192
class Proxy(object):
def __init__(self,conn,addr):
self.source=conn
self.request=""
self.headers={}
self.destnation=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
self.run()
def get_headers(self):
header=''
while True:
header+=self.source.recv(BUFLEN)
index=header.find('\n')
if index >0:
break
#firstLine,self.request=header.split('\r\n',1)
firstLine=header[:index]
self.request=header[index+1:]
self.headers['method'],self.headers['path'],self.headers['protocol']=firstLine.split()
def conn_destnation(self):
url=urlparse.urlparse(self.headers['path'])
hostname=url[1]
port="80"
if hostname.find(':') >0:
addr,port=hostname.split(':')
else:
addr=hostname
port=int(port)
ip=socket.gethostbyname(addr)
print ip,port
self.destnation.connect((ip,port))
data="%s %s %s\r\n" %(self.headers['method'],self.headers['path'],self.headers['protocol'])
self.destnation.send(data+self.request)
print data+self.request
def renderto(self):
readsocket=[self.destnation]
while True:
data=''
(rlist,wlist,elist)=select.select(readsocket,[],[],3)
if rlist:
data=rlist[0].recv(BUFLEN)
if len(data)>0:
self.source.send(data)
else:
break
def run(self):
self.get_headers()
self.conn_destnation()
self.renderto()
class Server(object):
def __init__(self,host,port,handler=Proxy):
self.host=host
self.port=port
self.server=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
self.server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.server.bind((host,port))
self.server.listen(5)
self.handler=handler
def start(self):
while True:
try:
conn,addr=self.server.accept()
thread.start_new_thread(self.handler,(conn,addr))
except:
pass
if __name__=='__main__':
s=Server('127.0.0.1',8080)
s.start()
import socket
import thread
import urlparse
import select
BUFLEN=8192
class Proxy(object):
def __init__(self,conn,addr):
self.source=conn
self.request=""
self.headers={}
self.destnation=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
self.run()
def get_headers(self):
header=''
while True:
header+=self.source.recv(BUFLEN)
index=header.find('\n')
if index >0:
break
#firstLine,self.request=header.split('\r\n',1)
firstLine=header[:index]
self.request=header[index+1:]
self.headers['method'],self.headers['path'],self.headers['protocol']=firstLine.split()
def conn_destnation(self):
url=urlparse.urlparse(self.headers['path'])
hostname=url[1]
port="80"
if hostname.find(':') >0:
addr,port=hostname.split(':')
else:
addr=hostname
port=int(port)
ip=socket.gethostbyname(addr)
print ip,port
self.destnation.connect((ip,port))
data="%s %s %s\r\n" %(self.headers['method'],self.headers['path'],self.headers['protocol'])
self.destnation.send(data+self.request)
print data+self.request
def renderto(self):
readsocket=[self.destnation]
while True:
data=''
(rlist,wlist,elist)=select.select(readsocket,[],[],3)
if rlist:
data=rlist[0].recv(BUFLEN)
if len(data)>0:
self.source.send(data)
else:
break
def run(self):
self.get_headers()
self.conn_destnation()
self.renderto()
class Server(object):
def __init__(self,host,port,handler=Proxy):
self.host=host
self.port=port
self.server=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
self.server.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.server.bind((host,port))
self.server.listen(5)
self.handler=handler
def start(self):
while True:
try:
conn,addr=self.server.accept()
thread.start_new_thread(self.handler,(conn,addr))
except:
pass
if __name__=='__main__':
s=Server('127.0.0.1',8080)
s.start()
其实Http代理服务器本身不难，但写出来还是挺费事的，这里就不细说源代码了，很简单。主要说说，我遇到的问题。
一： 我本来只知道，thread.start_new_thread的第一个参数是函数对象，但当我看到上面的博文时，心里一愣，这样也可以，于是我迅速的测试了一下：
[python]
import thread
class Hello:
def __init__(self,content):
print content
def cs():
thread.start_new_thread(Hello, ("Hello World",))
if __name__=='__main__':
cs()
import thread
class Hello:
def __init__(self,content):
print content
def cs():
thread.start_new_thread(Hello, ("Hello World",))
if __name__=='__main__':
cs()
我很失望的发现，报了个异常
[python]
Unhandled exception in thread started by
Error in sys.excepthook:
Original exception was:
Unhandled exception in thread started by
Error in sys.excepthook:
Original exception was:
一看，我说嘛，第一个参数怎么可以是对象，我呵呵一笑，稍微鄙视了一下作者。于是，我洗洗睡了，第二天，我还是不死心，于是把代码下下来，本地实验了一下，可以的，立马意识到是我2了，于是立马百度。
原来thread模块中，主线程如果比子线程先结束，就会抛出这个异常，所以我们必须让子线程先结束，最简单的方法就是让主线程sleep足够长的时间，至于多长时间，貌似不知道，那到底怎么解决呢？
比较好的解决办法就是，主线程给每个子线程都加一把锁，子线程在结束前将锁释放掉，主线程一直循环检查锁的状态。代码如下：
[python]
import thread
class Hello:
def __init__(self,content,lock):
print content
"""
do something
....
At the end,release the lock
"""
lock.release()
def cs():
lock=thread.allocate_lock()
lock.acquire()
thread.start_new_thread(Hello, ("Hello World",lock))
while True:
if not lock.locked():
break
print "lock release"
if __name__=='__main__':
cs()
import thread
class Hello:
def __init__(self,content,lock):
print content
"""
do something
....
At the end,release the lock
"""
lock.release()
def cs():
lock=thread.allocate_lock()
lock.acquire()
thread.start_new_thread(Hello, ("Hello World",lock))
while True:
if not lock.locked():
break
print "lock release"
if __name__=='__main__':
cs()
结果如下： [python] view plaincopyprint?Hello World
lock release
Hello World
lock release
二.第二个错误就是比较2的了
[python]
self.source.send[data]
peError: 'builtin_function_or_method' object is unsubscriptable
self.source.send[data]
TypeError: 'builtin_function_or_method' object is unsubscriptable
主要是单词unsubscriptable不认识，呵呵，单词不认识，伤不起啊。
主要意思就是说，内置函数或方法无法拥有下标，你懂的，错的很好很好。
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