sampy3/sampy/server.py

from __future__ import annotations

import asyncio
import logging
from typing import TYPE_CHECKING, Optional, Tuple, Type

from sampy.client.player import Player
from sampy.config import Config

if TYPE_CHECKING:
    from sampy.network.protocol import Protocol


class UDPProtocol:
    transport: asyncio.transports.DatagramTransport

    def __init__(self, protocol: Protocol, local_addr: Tuple[str, int]):
        self.protocol = protocol
        self.local_addr = local_addr

    def start(self):
        loop = asyncio.get_event_loop()
        logging.debug("Creating datagram endpoint")
        connect = loop.create_datagram_endpoint(
            lambda: self,
            local_addr=self.local_addr,
        )
        loop.run_until_complete(connect)

    def stop(self):  # TODO: Shutdown code
        if self.transport is None:
            raise Exception("Cannot stop a server that hasn't been started")

        logging.debug("Shutting down")
        self.transport.close()

    def connection_made(self, transport: asyncio.transports.DatagramTransport):
        logging.debug("UDP Protocol: connection_made")
        self.transport = transport

    def connection_lost(self, exc: Exception | None):
        logging.debug("UDP Protocol: connection_lost")

    def datagram_received(self, data: bytes, addr: Tuple[str, int]):
        raise NotImplementedError

    def sendto(self, data: bytes | bytearray | memoryview, addr: Tuple[str, int]):
        self.transport.sendto(data, addr)


class Server(UDPProtocol):
    config: Config

    def __init__(self, protocol: Type[Protocol], config: Optional[Config] = None):
        if config is None:
            config = Config()
            logging.warn("Server was initialized with default config")
        super().__init__(
            protocol=protocol(),
            local_addr=(
                config.get("sampy", "host"),
                config.getint("sampy", "port"),
            ),
        )

        self.config = config

    def datagram_received(self, data: bytes, addr: Tuple[str, int]):
        loop = asyncio.get_event_loop()
        loop.create_task(self.protocol.on_packet(self, data, addr))

    @property
    def players(self) -> list[Player]:  # TODO
        return []


class InteractiveServer(Server):
    def __init__(self, protocol: Type[Protocol], config: Optional[Config] = None):
        super().__init__(protocol=protocol, config=config)
        loop = asyncio.get_event_loop()
        loop.create_task(self.run_input_loop())

    async def run_input_loop(self):
        loop = asyncio.get_event_loop()
        while True:
            command = await loop.run_in_executor(None, input)

            if command in ("quit", "exit", "stop"):
                self.stop()
                loop.stop()
                return