tcp_port_tran/target.py

import os
import sys
import json
import socket


import prot_codec as pc



# 定义服务器和客户端
# device:
# server
# client
# proxy
# 定义操作类型
# option:
# connect
# disconnect
# data
# login
# close


# 这里是公共变量，所有tcp_target对象都可以访问
# 只支持一对一连接
_tcp_server=None
_tcp_client=None



class tcp_target(object):
  def __init__(self,tcp_handler:socket):
    self.handler=tcp_handler
    self.state="idle"
  def recv_handler(self,recv_data:bytearray):
    global _tcp_client
    global _tcp_server
    # 解包查看数据类型
    cmd,data=pc.decode(recv_data)
    print(cmd.decode('utf-8'))
    j=json.loads(cmd)
    if(j["device"]=="client"):
      if(j["option"]=="login"):
        # 登陆时保存客户端句柄，断开之前的句柄
        if(_tcp_client is not None):
          _tcp_client.close()
        _tcp_client=self.handler
      else:
        # 其他消息原样发送到服务器端
        if(_tcp_server is not None):
          _tcp_server.send(recv_data)
    if(j["device"]=="server"):
      if(j["option"]=="login"):
        # 登陆时保存客户端句柄，断开之前的句柄
        if(_tcp_server is not None):
          _tcp_server.close()
        _tcp_server=self.handler
      else:
        # 其他消息原样发送到客户端
        if(_tcp_client is not None):
          _tcp_client.send(recv_data)
  # 通知服务器和客户端断开连接
  # 这里只进行数据的收发处理，不执行端口的close操作
  def close(self):
    cmd={'device':'proxy','option':'close'}
    data=pc.encode(json.dumps(cmd).encode('utf-8'),b'default')
    # 这里有可能连接已经断开，无法发送
    if(_tcp_client is not None):
      try:
        _tcp_client.send(data)
      except Exception as e:
        print("target_close:",str(e))
    if(_tcp_server is not None):
      try:
        _tcp_server.send(data)
      except Exception as e:
        print("target_close:",str(e))