Python Socket多线程并发原理及实现

1.socketserver模块编写的tcp服务器端代码

　socketserver原理图

服务端：

import socketserver      #导入socketserver，多线程并发由此类实现
 
class mysockserver(socketserver.baserequesthandler):  #定义一个类
 
  def handle(self):   #handle(self)方法是必须要定义的，可以看上面的说明
    print 'got a new connection from', self.client_address
    while true:
      data = self.request.recv(1024)  #需要通过self的方法调用数据接收函数
      if not data:break
      print 'recv:', data
 
      self.request.send(data.upper())  #需要通过self的方法调用数据接收函数
 
if __name__ == '__main__':  #并非一定要用这样的方式，只是建议这样使用
  host = ''       #定义侦听本地地址口（多个ip地址情况下），这里表示侦听所有
  port = 50007     #server端开放的服务端口
  s = socketserver.threadingtcpserver((host, port), mysockserver)
               #调用socketserver模块的多线程并发函数
  s.serve_forever()   #持续接受客户端的连接

客户端：

import socket
 
host = '192.168.1.13'
port = 50007
s = socket.socket(socket.af_inet, socket.sock_stream)
s.connect((host, port))
 
while true:
  user_input = raw_input('msg to send:').strip()
  s.sendall(user_input)
  data = s.recv(1024)
  print 'received', repr(data)
 
s.close()

 2.基于python socketserver的实现的ftp程序

　服务端：

import socketserver
import struct
import json
import os
class ftpserver(socketserver.baserequesthandler):
  coding='utf-8'
  server_dir='file_upload'
  max_packet_size=1024
  base_dir=os.path.dirname(os.path.abspath(__file__))
  def handle(self):
    print(self.request)
    while true:
      data=self.request.recv(4)
      data_len=struct.unpack('i',data)[0]
      head_json=self.request.recv(data_len).decode(self.coding)
      head_dic=json.loads(head_json)
      # print(head_dic)
      cmd=head_dic['cmd']
      if hasattr(self,cmd):
        func=getattr(self,cmd)
        func(head_dic)
  def put(self,args):
    file_path = os.path.normpath(os.path.join(
      self.base_dir,
      self.server_dir,
      args['filename']
    ))

    filesize = args['filesize']
    recv_size = 0
    print('----->', file_path)
    with open(file_path, 'wb') as f:
      while recv_size < filesize:
        recv_data = self.request.recv(self.max_packet_size)
        f.write(recv_data)
        recv_size += len(recv_data)
        print('recvsize:%s filesize:%s' % (recv_size, filesize))


ftpserver=socketserver.threadingtcpserver(('127.0.0.1',8080),ftpserver)
ftpserver.serve_forever()

　客户端：

import socket
import struct
import json
import os



class mytcpclient:
  address_family = socket.af_inet

  socket_type = socket.sock_stream

  allow_reuse_address = false

  max_packet_size = 8192

  coding='utf-8'

  request_queue_size = 5

  def __init__(self, server_address, connect=true):
    self.server_address=server_address
    self.socket = socket.socket(self.address_family,
                  self.socket_type)
    if connect:
      try:
        self.client_connect()
      except:
        self.client_close()
        raise

  def client_connect(self):
    self.socket.connect(self.server_address)

  def client_close(self):
    self.socket.close()

  def run(self):
    while true:
      inp=input(">>: ").strip()
      if not inp:continue
      l=inp.split()
      cmd=l[0]
      if hasattr(self,cmd):
        func=getattr(self,cmd)
        func(l)


  def put(self,args):
    cmd=args[0]
    filename=args[1]
    if not os.path.isfile(filename):
      print('file:%s is not exists' %filename)
      return
    else:
      filesize=os.path.getsize(filename)

    head_dic={'cmd':cmd,'filename':os.path.basename(filename),'filesize':filesize}
    print(head_dic)
    head_json=json.dumps(head_dic)
    head_json_bytes=bytes(head_json,encoding=self.coding)

    head_struct=struct.pack('i',len(head_json_bytes))
    self.socket.send(head_struct)
    self.socket.send(head_json_bytes)
    send_size=0
    with open(filename,'rb') as f:
      for line in f:
        self.socket.send(line)
        send_size+=len(line)
        print(send_size)
      else:
        print('upload successful')




client=mytcpclient(('127.0.0.1',8080))

client.run()

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