socketref,再见!高德

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dvr项目中flex驻留在浏览器,而影响播放程序是独立的进程,sandbox的安全问题导致flex的代码无法直接与播放进程IPC通信,那只有通过公网IP的主机进行桥接。
很多年以前用过foundstone系列的工具,也有socket转向的功能,包括在5173时做过lsp的底层转向软件(仿sockcap),原理当然是相当简单,python是首选工具。
代码接收两端建立socket进来,并根据相同的id号来进行socket配对,之后两个socket之间就实现互相转发(技术同之前写的http代理服务器 )

  1 # -- coding:utf-8 --
  2 
  3 import socket,traceback,os,os.path,sys,time,struct,base64,gzip,array,threading
  4 import select,json
  5 
  6 
  7 '''
  8 {'id','type'}
  9 
 10 type - 'mapshow','imageplay'
 11 id - 一次会话的编号
 12 
 13 imageplay 与xbridge建立socket连接,并注册一个会话编号(随机产生)
 14 imageplay启动mapshow,并将会话编号传递给mapshow,mapshow建立xbridge的连接,并提交会话编号
 15 xbridge将双向传递相同会话编号的数据到对方
 16 
 17 sock1的客户必须等sock2连接进入之后发送数据,否则将sock1数据转发给sock2时将产生异常
 18 '''
 19 
 20 class ConnectionPair:
 21     def __init__(self,app):
 22         self.app = app
 23         self.id = ''
 24         self.sock1=None #imageplay上来的连接
 25         self.sock2=None #第二个连接上来的对象mapdemo
 26         
 27     def start(self):
 28         t = threading.Thread(target=self.threadRecv)
 29         t.start()
 30         
 31     def onLostConnection(self):
 32         try:
 33             print 'connection pair lost..'
 34             self.sock1.close()
 35             self.sock2.close()
 36             self.app.onConnectionPairBroken(self)
 37         except:
 38             traceback.print_exc()
 39         
 40     def threadRecv(self):
 41         print 'service threading entering'
 42         import select
 43         while True:
 44             fds = []
 45             if self.sock1:
 46                 fds.append(self.sock1)
 47             if self.sock2:
 48                 fds.append(self.sock2)
 49             #fds = [self.sock1,self.sock2]
 50             try:
 51                 #sock2未连接进来前,将不接收sock1上产生数据
 52                 #print 'fds:',len(fds),fds
 53                 rds,wds,eds = select.select(fds,[],[],1)
 54                 if not rds:#timeout 
 55                     continue
 56                         
 57                 for s in rds:
 58                     d = s.recv(1024)
 59                     #print d
 60                     if not d:
 61                         raise 'any jump'
 62                     
 63                     to = self.sock2
 64                     if s == self.sock2:
 65                         to = self.sock1
 66                     #print 'redirect data:',d
 67                     to.sendall(d)        
 68             except:
 69                 traceback.print_exc()
 70                 self.onLostConnection()
 71                 break
 72         
 73         print 'ConnThread Exiting'
 74             
 75             
 76     
 77 
 78 class XBridge:
 79     def __init__(self,addr=('',12788)):
 80         self.sock = None
 81         self.addr = addr
 82         self.conns={} #{id}
 83         self.mtxconns = threading.Lock()
 84         
 85     def onConnectionPairBroken(self,cp):
 86         self.mtxconns.acquire()
 87         del self.conns[cp.id]
 88         print 'onConnectionPairBroken(),removed:',cp.id
 89         self.mtxconns.release()
 90         
 91     def start(self):
 92         try:
 93             
 94             self.sock = socket.socket()
 95             #print 'lll',self.addr
 96             self.sock.bind( tuple(self.addr) )
 97             self.sock.listen(5)
 98             
 99             self.thread = threading.Thread(target=self.service_loop)
100             self.thread.start()
101             print 'xbridge started!'
102             self.thread.join()
103         except:
104             traceback.print_exc()
105             return False
106         
107     def shutdown(self):
108         self.sock.close()
109          
110     
111     def service_loop(self):
112         
113         while True:
114             fdr = []
115             fdr.append(self.sock)
116             infds,wr,e = select.select(fdr,[],[])
117             if e:
118                 print 'service thread exit'
119                 break
120             for s in infds:
121                 if s == self.sock: #新连接到达 
122                     sock = None
123                     try:                        
124                         sock,peer = self.sock.accept()    #异常产生表示self.sock被强行关闭
125                         print 'new client incoming',peer
126                     except
127                         return
128                     thread = threading.Thread(target=self.threadNewClient,args=(sock,))
129                     thread.start()
130     
131     def threadNewClient(self,sock):
132         #等待注册信息进入 ,5 秒超时
133         try:
134             fdr = [sock,]
135             print 'enter select '
136             infds,wr,e = select.select(fdr,[],[],5)
137             
138             if not infds:
139                 sock.close()
140                 print 'client register timeout'
141                 return #接收超时
142             d = sock.recv(1024)
143             d = json.loads(d)
144             id,type = d['id'],d['type']
145             connpair = None
146             print id,type
147             self.mtxconns.acquire()
148             if type == 'imageplay':
149             
150                 cp = ConnectionPair(self)
151                 cp.id = id
152                 cp.sock1 = sock
153                 self.conns[id] = cp
154                 cp.start()
155                 
156             elif type =='mapshow':
157                 connpair = self.conns.get(id,None)
158                 if connpair == None: #没找到imageplay
159                     sock.close()
160                     print 'mapshow cannt found imageplay..'
161                 else:
162                     print 'mapclient matched!'
163                     connpair.sock2 = sock                    
164             else:
165                 print 'unknown command id:',id,type
166                 
167             self.mtxconns.release()    
168         except:
169             sock.close()
170             traceback.print_exc()
171         
172 if __name__=='__main__':
173     XBridge().start() #default '',12788
174    
posted on 2012-04-14 17:42 放屁阿狗 阅读(1693) 评论(0)  编辑 收藏 引用

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