socketserver

Posted MJay_Lee

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 基于tcp的套接字,关键就是两个循环,一个链接循环,一个通信循环

socketserver模块中分两大类:server类(解决链接问题)和request类(解决通信问题)

server类:

request类:

继承关系:

 

 

 

以下述代码为例,分析socketserver源码:

ftpserver=socketserver.ThreadingTCPServer((\'127.0.0.1\',8080),FtpServer)
ftpserver.serve_forever()

查找属性的顺序:ThreadingTCPServer->ThreadingMixIn->TCPServer->BaseServer

  1. 实例化得到ftpserver,先找类ThreadingTCPServer的__init__,在TCPServer中找到,进而执行server_bind,server_active
  2. 找ftpserver下的serve_forever,在BaseServer中找到,进而执行self._handle_request_noblock(),该方法同样是在BaseServer中
  3. 执行self._handle_request_noblock()进而执行request, client_address = self.get_request()(就是TCPServer中的self.socket.accept()),然后执行self.process_request(request, client_address)
  4. 在ThreadingMixIn中找到process_request,开启多线程应对并发,进而执行process_request_thread,执行self.finish_request(request, client_address)
  5. 上述四部分完成了链接循环,本部分开始进入处理通讯部分,在BaseServer中找到finish_request,触发我们自己定义的类的实例化,去找__init__方法,而我们自己定义的类没有该方法,则去它的父类也就是BaseRequestHandler中找....

源码分析总结:

基于tcp的socketserver我们自己定义的类中的

  1.   self.server即套接字对象
  2.   self.request即一个链接
  3.   self.client_address即客户端地址

基于udp的socketserver我们自己定义的类中的

  1.   self.request是一个元组(第一个元素是客户端发来的数据,第二部分是服务端的udp套接字对象),如(b\'adsf\', <socket.socket fd=200, family=AddressFamily.AF_INET, type=SocketKind.SOCK_DGRAM, proto=0, laddr=(\'127.0.0.1\', 8080)>)
  2.   self.client_address即客户端地址
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time    : 2018/05/04 15:11
# @Author  : MJay_Lee
# @File    : server.py
# @Contact : limengjiejj@hotmail.com

import socketserver

# 通信循环
class MytcpHandler(socketserver.BaseRequestHandler):
    def handle(self):
        print(self)
        print(self.request)
        while True:
            try:
                data = self.request.recv(1024)
                if not data: break
                self.request.send(data.upper())
            except ConnectionResetError:
                break
        self.request.close()

if __name__ == \'__main__\':
    # 接收连接,(来一个连接,就创造一个线程对象并调该对象下的handle方法去服务此客户)
    server = socketserver.ThreadingTCPServer((\'127.0.0.1\',8080),MytcpHandler)
    # print(server) # <socketserver.ThreadingTCPServer object at 0x000000132630C0B8>
    # print(server.server_address) # (\'127.0.0.1\', 8080)
    # print(server.RequestHandlerClass) # <class \'__main__.MytcpHandler\'>
    # print(server.socket) # <socket.socket fd=380, family=AddressFamily.AF_INET, type=SocketKind.SOCK_STREAM, proto=0, laddr=(\'127.0.0.1\', 8080)>
    server.serve_forever()
基于TCP-服务端
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time    : 2018/05/04 15:11
# @Author  : MJay_Lee
# @File    : client.py
# @Contact : limengjiejj@hotmail.com

import os
import socket
client = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
client.connect((\'127.0.0.1\',8080))

while True:
    msg = \'%s is running\' % os.getpid()
    client.send(msg.encode(\'utf-8\'))
    reply_msg = client.recv(1024)
    print(reply_msg.decode(\'utf-8\'))
基于TCP-客户端
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time    : 2018/05/04 17:40
# @Author  : MJay_Lee
# @File    : server.py
# @Contact : limengjiejj@hotmail.com

import socketserver

# 通信循环
class MyudpHandler(socketserver.BaseRequestHandler):
    def handle(self):
        # print(self)
        # print(self.request)
        # 区别于tcp,此处self.request接收到的内容为元组
        # (b\'4208 is running\', <socket.socket fd=360, family=AddressFamily.AF_INET, type=SocketKind.SOCK_DGRAM, proto=0, laddr=(\'127.0.0.1\', 8080)>)
        msg = self.request[0]
        print(\'client发送来的数据\',msg.decode(\'utf-8\'))
        self.request[1].sendto(msg.upper(),self.client_address)

if __name__ == \'__main__\':
    # 接收连接,(来一个连接,就创造一个线程对象并调该对象下的handle方法去服务此客户)
    server = socketserver.ThreadingUDPServer((\'127.0.0.1\', 8080), MyudpHandler)
    # print(server) # <socketserver.ThreadingUDPServer object at 0x00000021E29AA198>
    # print(server.server_address) # (\'127.0.0.1\', 8080)
    # print(server.RequestHandlerClass) # <class \'__main__.MyudpHandler\'>
    # print(server.socket) # <socket.socket fd=368, family=AddressFamily.AF_INET, type=SocketKind.SOCK_DGRAM, proto=0, laddr=(\'127.0.0.1\', 8080)>
    server.serve_forever()
基于UDP服务端
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time    : 2018/05/04 17:41
# @Author  : MJay_Lee
# @File    : client.py
# @Contact : limengjiejj@hotmail.com

import os
import socket
client = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
client.connect((\'127.0.0.1\',8080))

while True:
    msg = \'%s is running\' % os.getpid()
    client.sendto(msg.encode(\'utf-8\'),(\'127.0.0.1\',8080))
    reply_msg = client.recv(1024)
    print(reply_msg.decode(\'utf-8\'))
基于UDP客户端

 

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