本节内容:

  1. Socket语法及相关
  2. SocketServer实现多并发

1.  Socket语法及相关

  sk = socket.socket(socket.AF_INET,socket.SOCK_STREAM,0)

  参数一:地址簇

  socket.AF_INET IPv4(默认)
  socket.AF_INET6 IPv6

  socket.AF_UNIX 只能够用于单一的Unix系统进程间通信

  参数二:类型

  socket.SOCK_STREAM  流式socket , for TCP (默认)
  socket.SOCK_DGRAM   数据报式socket
, for UDP

  socket.SOCK_RAW 原始套接字,普通的套接字无法处理ICMP、IGMP等网络报文,而SOCK_RAW可以;其次,SOCK_RAW也可以处理特殊的IPv4报文;此外,利用原始套接字,可以通过IP_HDRINCL套接字选项由用户构造IP头。
  socket.SOCK_RDM 是一种可靠的UDP形式,即保证交付数据报但不保证顺序。SOCK_RAM用来提供对原始协议的低级访问,在需要执行某些特殊操作时使用,如发送ICMP报文。SOCK_RAM通常仅限于高级用户或管理员运行的程序使用。
  socket.SOCK_SEQPACKET 可靠的连续数据包服务

  参数三:协议

  0  (默认)与特定的地址家族相关的协议,如果是 0 ,则系统就会根据地址格式和套接类别,自动选择一个合适的协议

  • sk.bind(address)  将套接字绑定到地址。address地址的格式取决于地址族。在AF_INET下,以元组(host,port)的形式表示地址。
  • sk.listen(backlog)  开始监听传入连接。backlog指定在拒绝连接之前,可以挂起的最大连接数量。backlog等于5,表示内核已经接到了连接请求,但服务器还没有调用accept进行处理的连接个数最大为5。这个值不能无限大,因为要在内核中维护连接队列。
  • sk.setblocking(bool)  是否阻塞(默认True),如果设置False,那么accept和recv时一旦无数据,则报错。
  • sk.accept()  接受连接并返回(conn,address),其中conn是新的套接字对象,可以用来接收和发送数据。address是连接客户端的地址。接收TCP 客户的连接(阻塞式)等待连接的到来。
  • sk.connect(address)  连接到address处的套接字。一般,address的格式为元组(hostname,port),如果连接出错,返回socket.error错误。
  • sk.connect_ex(address)  同上,只不过会有返回值,连接成功时返回 0 ,连接失败时候返回编码,例如:10061
  • sk.close()  关闭套接字
  • sk.recv(bufsize[,flag])  接受套接字的数据。数据以字符串形式返回,bufsize指定最多可以接收的数量。flag提供有关消息的其他信息,通常可以忽略。
  • sk.recvfrom(bufsize[.flag])  与recv()类似,但返回值是(data,address)。其中data是包含接收数据的字符串,address是发送数据的套接字地址。
  • sk.send(string[,flag])  将string中的数据发送到连接的套接字。返回值是要发送的字节数量,该数量可能小于string的字节大小。即:可能未将指定内容全部发送。
  • sk.sendall(string[,flag])  将string中的数据发送到连接的套接字,但在返回之前会尝试发送所有数据。成功返回None,失败则抛出异常。内部通过递归调用send,将所有内容发送出去。
  • sk.sendto(string[,flag],address)  将数据发送到套接字,address是形式为(ipaddr,port)的元组,指定远程地址。返回值是发送的字节数。该函数主要用于UDP协议。
  • sk.settimeout(timeout)  设置套接字操作的超时期,timeout是一个浮点数,单位是秒。值为None表示没有超时期。一般,超时期应该在刚创建套接字时设置,因为它们可能用于连接的操作(如 client 连接最多等待5s )
  • sk.getpeername()  返回连接套接字的远程地址。返回值通常是元组(ipaddr,port)。
  • sk.getsockname()  返回套接字自己的地址。通常是一个元组(ipaddr,port)
  • sk.fileno()  套接字的文件描述符

2.  SocketServer实现多并发

  SocketServer内部使用 IO多路复用 以及 “多线程” 和 “多进程” ,从而实现并发处理多个客户端请求的Socket服务端。

+------------+

| BaseServer |

+------------+

|

v

+-----------+        +------------------+

| TCPServer |------->| UnixStreamServer |

+-----------+        +------------------+

|

v

+-----------+        +--------------------+

| UDPServer |------->| UnixDatagramServer |

  SocketServer简化了网络服务器的编写。它有4个类:TCPServer,UDPServer,UnixStreamServer,UnixDatagramServer。
  这4个类是同步进行处理的,另外通过ForkingMixIn和ThreadingMixIn类来支持异步。

  创建socketserver的步骤:

  • 自己创建一个请求处理类,并且这个类要继承BaseRequestHandler,并且重写父类里的handle方法
  • 必须实例化TCPserver,并且传递server ip和 你上面创建的请求处理类给这个TCPserver
  • server.handle_request() #只处理一个请求 (不建议用);  server.serve_forever() #处理多个请求 ,永远执行。
  1.  

  ThreadingTCPServer

  ThreadingTCPServer实现的Soket服务器内部会为每个client创建一个 “线程”,该线程用来和客户端进行交互。

  1)ThreadingTCPServer基础

  使用ThreadingTCPServer:

  

  1. import SocketServer
  2.  
  3. class MyTCPserver(SocketServer.BaseRequestHandler):
  4.  
  5. def handle(self):
  6. pass
  7.  
  8. if __name__ == '__main__':
  9. server = SocketServer.ThreadingTCPServer(('127.0.0.1',5566), MyTCPserver)
  10. server.serve_forever()

Threading TCP server

  2)ThreadingTCPServer源码剖析

  ThreadingTCPServer的类图关系如下:

  

  内部调用流程为:

  • 启动服务端程序
  • 执行 TCPServer.__init__ 方法,创建服务端Socket对象并绑定 IP 和 端口
  • 执行 BaseServer.__init__ 方法,将自定义的继承自SocketServer.BaseRequestHandler 的类 MyRequestHandle赋值给self.RequestHandlerClass
  • 执行 BaseServer.server_forever 方法,While 循环一直监听是否有客户端请求到达 ...
  • 当客户端连接到达服务器
  • 执行 ThreadingMixIn.process_request 方法,创建一个 “线程” 用来处理请求
  • 执行 ThreadingMixIn.process_request_thread 方法
  • 执行 BaseServer.finish_request 方法,执行 self.RequestHandlerClass()  即:执行 自定义 MyRequestHandler 的构造方法(自动调用基类BaseRequestHandler的构造方法,在该构造方法中又会调用 MyRequestHandler的handle方法)

  ThreadingTCPServer相关源码:

  BaseServer

  

  1. class BaseServer:
  2.  
  3. """Base class for server classes.
  4.  
  5. Methods for the caller:
  6.  
  7. - __init__(server_address, RequestHandlerClass)
  8. - serve_forever(poll_interval=0.5)
  9. - shutdown()
  10. - handle_request() # if you do not use serve_forever()
  11. - fileno() -> int # for select()
  12.  
  13. Methods that may be overridden:
  14.  
  15. - server_bind()
  16. - server_activate()
  17. - get_request() -> request, client_address
  18. - handle_timeout()
  19. - verify_request(request, client_address)
  20. - server_close()
  21. - process_request(request, client_address)
  22. - shutdown_request(request)
  23. - close_request(request)
  24. - handle_error()
  25.  
  26. Methods for derived classes:
  27.  
  28. - finish_request(request, client_address)
  29.  
  30. Class variables that may be overridden by derived classes or
  31. instances:
  32.  
  33. - timeout
  34. - address_family
  35. - socket_type
  36. - allow_reuse_address
  37.  
  38. Instance variables:
  39.  
  40. - RequestHandlerClass
  41. - socket
  42.  
  43. """
  44.  
  45. timeout = None
  46.  
  47. def __init__(self, server_address, RequestHandlerClass):
  48. """Constructor. May be extended, do not override."""
  49. self.server_address = server_address
  50. self.RequestHandlerClass = RequestHandlerClass
  51. self.__is_shut_down = threading.Event()
  52. self.__shutdown_request = False
  53.  
  54. def server_activate(self):
  55. """Called by constructor to activate the server.
  56.  
  57. May be overridden.
  58.  
  59. """
  60. pass
  61.  
  62. def serve_forever(self, poll_interval=0.5):
  63. """Handle one request at a time until shutdown.
  64.  
  65. Polls for shutdown every poll_interval seconds. Ignores
  66. self.timeout. If you need to do periodic tasks, do them in
  67. another thread.
  68. """
  69. self.__is_shut_down.clear()
  70. try:
  71. while not self.__shutdown_request:
  72. # XXX: Consider using another file descriptor or
  73. # connecting to the socket to wake this up instead of
  74. # polling. Polling reduces our responsiveness to a
  75. # shutdown request and wastes cpu at all other times.
  76. r, w, e = _eintr_retry(select.select, [self], [], [],
  77. poll_interval)
  78. if self in r:
  79. self._handle_request_noblock()
  80. finally:
  81. self.__shutdown_request = False
  82. self.__is_shut_down.set()
  83.  
  84. def shutdown(self):
  85. """Stops the serve_forever loop.
  86.  
  87. Blocks until the loop has finished. This must be called while
  88. serve_forever() is running in another thread, or it will
  89. deadlock.
  90. """
  91. self.__shutdown_request = True
  92. self.__is_shut_down.wait()
  93.  
  94. # The distinction between handling, getting, processing and
  95. # finishing a request is fairly arbitrary. Remember:
  96. #
  97. # - handle_request() is the top-level call. It calls
  98. # select, get_request(), verify_request() and process_request()
  99. # - get_request() is different for stream or datagram sockets
  100. # - process_request() is the place that may fork a new process
  101. # or create a new thread to finish the request
  102. # - finish_request() instantiates the request handler class;
  103. # this constructor will handle the request all by itself
  104.  
  105. def handle_request(self):
  106. """Handle one request, possibly blocking.
  107.  
  108. Respects self.timeout.
  109. """
  110. # Support people who used socket.settimeout() to escape
  111. # handle_request before self.timeout was available.
  112. timeout = self.socket.gettimeout()
  113. if timeout is None:
  114. timeout = self.timeout
  115. elif self.timeout is not None:
  116. timeout = min(timeout, self.timeout)
  117. fd_sets = _eintr_retry(select.select, [self], [], [], timeout)
  118. if not fd_sets[0]:
  119. self.handle_timeout()
  120. return
  121. self._handle_request_noblock()
  122.  
  123. def _handle_request_noblock(self):
  124. """Handle one request, without blocking.
  125.  
  126. I assume that select.select has returned that the socket is
  127. readable before this function was called, so there should be
  128. no risk of blocking in get_request().
  129. """
  130. try:
  131. request, client_address = self.get_request()
  132. except socket.error:
  133. return
  134. if self.verify_request(request, client_address):
  135. try:
  136. self.process_request(request, client_address)
  137. except:
  138. self.handle_error(request, client_address)
  139. self.shutdown_request(request)
  140.  
  141. def handle_timeout(self):
  142. """Called if no new request arrives within self.timeout.
  143.  
  144. Overridden by ForkingMixIn.
  145. """
  146. pass
  147.  
  148. def verify_request(self, request, client_address):
  149. """Verify the request. May be overridden.
  150.  
  151. Return True if we should proceed with this request.
  152.  
  153. """
  154. return True
  155.  
  156. def process_request(self, request, client_address):
  157. """Call finish_request.
  158.  
  159. Overridden by ForkingMixIn and ThreadingMixIn.
  160.  
  161. """
  162. self.finish_request(request, client_address)
  163. self.shutdown_request(request)
  164.  
  165. def server_close(self):
  166. """Called to clean-up the server.
  167.  
  168. May be overridden.
  169.  
  170. """
  171. pass
  172.  
  173. def finish_request(self, request, client_address):
  174. """Finish one request by instantiating RequestHandlerClass."""
  175. self.RequestHandlerClass(request, client_address, self)
  176.  
  177. def shutdown_request(self, request):
  178. """Called to shutdown and close an individual request."""
  179. self.close_request(request)
  180.  
  181. def close_request(self, request):
  182. """Called to clean up an individual request."""
  183. pass
  184.  
  185. def handle_error(self, request, client_address):
  186. """Handle an error gracefully. May be overridden.
  187.  
  188. The default is to print a traceback and continue.
  189.  
  190. """
  191. print
  192. '-' * 40
  193. print
  194. 'Exception happened during processing of request from',
  195. print
  196. client_address
  197. import traceback
  198. traceback.print_exc() # XXX But this goes to stderr!
  199. print
  200. '-' * 40

base server

  TCPServer

  

  1. class TCPServer(BaseServer):
  2.  
  3. """Base class for various socket-based server classes.
  4.  
  5. Defaults to synchronous IP stream (i.e., TCP).
  6.  
  7. Methods for the caller:
  8.  
  9. - __init__(server_address, RequestHandlerClass, bind_and_activate=True)
  10. - serve_forever(poll_interval=0.5)
  11. - shutdown()
  12. - handle_request() # if you don't use serve_forever()
  13. - fileno() -> int # for select()
  14.  
  15. Methods that may be overridden:
  16.  
  17. - server_bind()
  18. - server_activate()
  19. - get_request() -> request, client_address
  20. - handle_timeout()
  21. - verify_request(request, client_address)
  22. - process_request(request, client_address)
  23. - shutdown_request(request)
  24. - close_request(request)
  25. - handle_error()
  26.  
  27. Methods for derived classes:
  28.  
  29. - finish_request(request, client_address)
  30.  
  31. Class variables that may be overridden by derived classes or
  32. instances:
  33.  
  34. - timeout
  35. - address_family
  36. - socket_type
  37. - request_queue_size (only for stream sockets)
  38. - allow_reuse_address
  39.  
  40. Instance variables:
  41.  
  42. - server_address
  43. - RequestHandlerClass
  44. - socket
  45.  
  46. """
  47.  
  48. address_family = socket.AF_INET
  49.  
  50. socket_type = socket.SOCK_STREAM
  51.  
  52. request_queue_size = 5
  53.  
  54. allow_reuse_address = False
  55.  
  56. def __init__(self, server_address, RequestHandlerClass, bind_and_activate=True):
  57. """Constructor. May be extended, do not override."""
  58. BaseServer.__init__(self, server_address, RequestHandlerClass)
  59. self.socket = socket.socket(self.address_family,
  60. self.socket_type)
  61. if bind_and_activate:
  62. try:
  63. self.server_bind()
  64. self.server_activate()
  65. except:
  66. self.server_close()
  67. raise
  68.  
  69. def server_bind(self):
  70. """Called by constructor to bind the socket.
  71.  
  72. May be overridden.
  73.  
  74. """
  75. if self.allow_reuse_address:
  76. self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
  77. self.socket.bind(self.server_address)
  78. self.server_address = self.socket.getsockname()
  79.  
  80. def server_activate(self):
  81. """Called by constructor to activate the server.
  82.  
  83. May be overridden.
  84.  
  85. """
  86. self.socket.listen(self.request_queue_size)
  87.  
  88. def server_close(self):
  89. """Called to clean-up the server.
  90.  
  91. May be overridden.
  92.  
  93. """
  94. self.socket.close()
  95.  
  96. def fileno(self):
  97. """Return socket file number.
  98.  
  99. Interface required by select().
  100.  
  101. """
  102. return self.socket.fileno()
  103.  
  104. def get_request(self):
  105. """Get the request and client address from the socket.
  106.  
  107. May be overridden.
  108.  
  109. """
  110. return self.socket.accept()
  111.  
  112. def shutdown_request(self, request):
  113. """Called to shutdown and close an individual request."""
  114. try:
  115. # explicitly shutdown. socket.close() merely releases
  116. # the socket and waits for GC to perform the actual close.
  117. request.shutdown(socket.SHUT_WR)
  118. except socket.error:
  119. pass # some platforms may raise ENOTCONN here
  120. self.close_request(request)
  121.  
  122. def close_request(self, request):
  123. """Called to clean up an individual request."""
  124. request.close()

TCP server

  ThreadingMixIn

  

  1. class ThreadingMixIn:
  2. """Mix-in class to handle each request in a new thread."""
  3.  
  4. # Decides how threads will act upon termination of the
  5. # main process
  6. daemon_threads = False
  7.  
  8. def process_request_thread(self, request, client_address):
  9. """Same as in BaseServer but as a thread.
  10.  
  11. In addition, exception handling is done here.
  12.  
  13. """
  14. try:
  15. self.finish_request(request, client_address)
  16. self.shutdown_request(request)
  17. except:
  18. self.handle_error(request, client_address)
  19. self.shutdown_request(request)
  20.  
  21. def process_request(self, request, client_address):
  22. """Start a new thread to process the request."""
  23. t = threading.Thread(target=self.process_request_thread,
  24. args=(request, client_address))
  25. t.daemon = self.daemon_threads
  26. t.start()

threading mix-in

  ThreadingTCPServer

  

  1. class ThreadingTCPServer(ThreadingMixIn, TCPServer): pass

threading TCP server

  RequestHandler相关源码:

  

  1. BaseRequestHandler
  2.  
  3. class BaseRequestHandler:
  4.  
  5. """Base class for request handler classes.
  6.  
  7. This class is instantiated for each request to be handled. The
  8. constructor sets the instance variables request, client_address
  9. and server, and then calls the handle() method. To implement a
  10. specific service, all you need to do is to derive a class which
  11. defines a handle() method.
  12.  
  13. The handle() method can find the request as self.request, the
  14. client address as self.client_address, and the server (in case it
  15. needs access to per-server information) as self.server. Since a
  16. separate instance is created for each request, the handle() method
  17. can define arbitrary other instance variariables.
  18.  
  19. """
  20.  
  21. def __init__(self, request, client_address, server):
  22. self.request = request
  23. self.client_address = client_address
  24. self.server = server
  25. self.setup()
  26. try:
  27. self.handle()
  28. finally:
  29. self.finish()
  30.  
  31. def setup(self):
  32. pass
  33.  
  34. def handle(self):
  35. pass
  36.  
  37. def finish(self):
  38. pass

request handler

  SocketServer的ThreadingTCPServer之所以可以同时处理请求得益于 select 和 Threading 两个东西,其实本质上就是在服务器端为每一个客户端创建一个线程,当前线程用来处理对应客户端的请求,所以,可以支持同时n个客户端链接(长连接)。

  socketserver 实例:

  server side:

  

  1. import socketserver
  2.  
  3. class MyTCPHandler(socketserver.BaseRequestHandler):
  4. """
  5. The request handler class for our server.
  6.  
  7. It is instantiated once per connection to the server, and must
  8. override the handle() method to implement communication to the
  9. client.
  10. """
  11.  
  12. def handle(self):
  13. # self.request is the TCP socket connected to the client
  14. self.data = self.request.recv(1024).strip()
  15. print("{} wrote:".format(self.client_address[0]))
  16. print(self.data)
  17. # just send back the same data, but upper-cased
  18. self.request.sendall(self.data.upper())
  19.  
  20. if __name__ == "__main__":
  21. HOST, PORT = "localhost", 9999
  22.  
  23. # Create the server, binding to localhost on port 9999
  24. server = socketserver.ThreadingTCPServer((HOST, PORT), MyTCPHandler)
  25.  
  26. # Activate the server; this will keep running until you
  27. # interrupt the program with Ctrl-C
  28. server.serve_forever()

server side

  client side:

  

  1. import socket
  2. import sys
  3.  
  4. HOST, PORT = "localhost", 9999
  5. data = " ".join(sys.argv[1:])
  6.  
  7. # Create a socket (SOCK_STREAM means a TCP socket)
  8. sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
  9.  
  10. try:
  11. # Connect to server and send data
  12. sock.connect((HOST, PORT))
  13. sock.sendall(bytes(data + "\n", "utf-8"))
  14.  
  15. # Receive data from the server and shut down
  16. received = str(sock.recv(1024), "utf-8")
  17. finally:
  18. sock.close()
  19.  
  20. print("Sent: {}".format(data))
  21. print("Received: {}".format(received))

client side

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