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import asyncio
import sys

# 转发客户端到服务器的流量
async def trans_c2s(reader, r_writer):
    while not reader.at_eof():
        data = await reader.read(256)
        r_writer.write(data)
        await r_writer.drain()
    r_writer.close()
	
# 转发服务器到客户端的流量
async def trans_s2c(r_reader, writer):
    while not r_reader.at_eof():
        r_data = await r_reader.read(256)
        writer.write(r_data)
        await writer.drain()
    writer.close()

async def handle(reader, writer):
    addr = writer.get_extra_info('peername')
    print(f'> Receive connection: {addr}!')
    
    # 启动反向代理连接
    r_reader, r_writer = await asyncio.open_connection(r_addr, r_port)
    
    ret = await asyncio.gather(
        trans_c2s(reader, r_writer),
        trans_s2c(r_reader, writer)
    )

    print(f'> Close connection: {addr} !')
	
# 主服务器进程
async def main():
    server = await asyncio.start_server(
        handle, "0.0.0.0", port)

    addr = server.sockets[0].getsockname()
    print(f'Serving on {addr}')

    async with server:
        await server.serve_forever()

if __name__ == "__main__":
    if len(sys.argv) < 4:
        print('> usage: python proxy.py [your_port] [romote_addr] [remote_port]')
        exit(1)
    port = int(sys.argv[1])
    r_addr = sys.argv[2]
    r_port = int(sys.argv[3])
    asyncio.run(main())