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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