matrix-appservice-minecraft/wrapper.py

import argparse
import logging
import re
import subprocess
import threading
from typing import List

import message_queue


LOG = logging.getLogger(__name__)


class ProcessWrapper:
    """Iterator that spawns a process and yields lines from its stdout."""

    def __init__(self, command: List[str]):
        self.proc = subprocess.Popen(
            " ".join(command),
            shell=True,
            stdout=subprocess.PIPE,
            stdin=subprocess.PIPE,
            universal_newlines=True,
        )

    def __iter__(self):
        return iter(self.proc.stdout.readline, "")

    def send(self, msg):
        self.proc.stdin.write(msg)

    def wait(self):
        return self.proc.wait()


def send_process_output(
    process: ProcessWrapper, msg_queue: message_queue.MessageQueue
):
    # "[07:36:28] [Server thread/INFO] [minecraft/DedicatedServer]: <khr_> test"
    prog = re.compile(r"\[.*\] \[(.*)\] \[(.*)\]: <(.*)> (.*)")
    for line in process:
        LOG.info(line.rstrip("\n"))
        result = prog.search(line)
        if result:
            LOG.info(
                "user: {} msg: {}".format(
                    result.group(3), result.group(4).rstrip("\n"),
                )
            )
            msg_queue.add(
                {"user": result.group(3), "msg": result.group(4).rstrip("\n")},
            )


def relay_queue_input(
    process: ProcessWrapper, msg_queue: message_queue.MessageQueue
):
    for message in msg_queue:
        if "command" in message:
            process.send(message["command"])
        else:
            LOG.debug(message)


def main():
    logging.basicConfig(level=logging.DEBUG)
    parser = argparse.ArgumentParser()
    parser.add_argument("--matrix_server", required=True)
    parser.add_argument("--matrix_server_port", type=int, default=5001)
    parser.add_argument("command", nargs=argparse.REMAINDER)
    args = parser.parse_args()

    LOG.info("Running Minecraft Server Wrapper")
    wrapper = ProcessWrapper(args.command)
    queue = message_queue.MessageQueue(
        host=args.matrix_server,
        port=args.matrix_server_port,
        side=message_queue.Side.CLIENT,
    )
    send_worker = threading.Thread(
        target=send_process_output, args=(wrapper, queue), daemon=True,
    )
    receive_worker = threading.Thread(
        target=relay_queue_input, args=(wrapper, queue), daemon=True,
    )
    send_worker.start()
    receive_worker.start()
    LOG.info("All threads created")
    send_worker.join()
    receive_worker.join()
    queue.close()
    LOG.info("All threads terminated")
    return wrapper.wait()


if __name__ == "__main__":
    main()