import asyncio
import sys


async def copy_stream(reader, writer):
    try:
        while data := await reader.read(65536):
            writer.write(data)
            await writer.drain()
    except (ConnectionError, asyncio.CancelledError):
        pass
    finally:
        writer.close()


async def connect_database(reader, writer):
    try:
        database_reader, database_writer = await asyncio.open_unix_connection(sys.argv[1])
    except OSError:
        writer.close()
        return
    await asyncio.gather(copy_stream(reader, database_writer), copy_stream(database_reader, writer))


async def main():
    server = await asyncio.start_server(connect_database, "127.0.0.1", 25432)
    async with server:
        await server.serve_forever()


asyncio.run(main())