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Python服务器开发三:Socket
socket是操作系统中I/O的延续,它可以使进程和机器之间的通信成为可能。socket可以看成一个标准的文件描述符。不同的是文件需要用open()函数打开,而socket用socket()
函数建立.recv()、send()函数和read()、write()函数极为相似。
TCP一般通过accept()来为每个连接的客户端建立一个新的scoket。UDP一般只是使用一个单一的socket,完全依靠recvfrom()返回的值来判断该往哪里发送响应。
客户端:
1、建立一个socket:
//SOCK_STREAM表示TCP,SOCK_DGRAM表示UDP,AF_INET表示IPv4
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
2、连接socket
连接socket需要一个tuple参数,来提供IP和端口号:
s.connect((“www.example.com”, 80))
3、
#!/usr/bin/env pythonimport socketprint "Creating socket...",s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)print "done."print "Looking up port number...",port = socket.getservbyname(‘http‘, ‘tcp‘)print "done."print "Connecting to remote host on port %d..." % port,s.connect(("www.google.com", port))print "done."#获取本身的IP和端口号print "Connected from", s.getsockname()#获取远程的IP和端口号print "Connected to", s.getpeername()
文件类对象:
import socket, sysport = 70host = sys.argv[1]filename = sys.argv[2]s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)s.connect((host, port))fd = s.makefile(‘rw‘, 0)fd.write(filename + "\r\n")for line in fd.readlines(): sys.stdout.write(line)
高级接口:
import urllib, sysf = urllib.urlopen(sys.argv[1])while 1: buf = f.read(2048) if not len(buf): break sys.stdout.write(buf)
服务器端:
1、建立一个连接:
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
2、设置socket选项:
//socket 端口可立即复用s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
3、绑定socket:
s.bind((host, port))
4、监听:
s.listen(1)
5、接受连接:
while 1: clientsock, clientaddr = s.accept() print "Got connection from", clientsock.getpeername() clientsock.close()
6、
#!/usr/bin/env pythonimport socket, tracebackhost = ‘‘ # Bind to all interfacesport = 51423s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)s.bind((host, port))
#这里设定每次最多只有一个等候处理的请求,真正的服务器会设置一个很高的数字。s.listen(1)while 1: try: clientsock, clientaddr = s.accept() except KeyboardInterrupt: raise except: traceback.print_exc() continue # Process the connection try: print "Got connection from", clientsock.getpeername() # Process the request here except (KeyboardInterrupt, SystemExit): raise except: traceback.print_exc() # Close the connection try: clientsock.close() except KeyboardInterrupt: raise except: traceback.print_exc()
使用UDP:
#!/usr/bin/env pythonimport socket, tracebackhost = ‘‘ # Bind to all interfacesport = 51423s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)s.bind((host, port))while 1: try: message, address = s.recvfrom(8192) print "Got data from", address # Echo it back s.sendto(message, address) except (KeyboardInterrupt, SystemExit): raise except: traceback.print_exc()
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