mirror of
https://github.com/SteamDeckHomebrew/decky-loader.git
synced 2026-06-14 04:35:07 +03:00
Jonas Dellinger
118 lines
4.6 KiB
Python
118 lines
4.6 KiB
Python
import json
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import multiprocessing
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import os
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import uuid
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from asyncio import (Protocol, get_event_loop, new_event_loop, set_event_loop,
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sleep)
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from importlib.util import module_from_spec, spec_from_file_location
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from posixpath import join
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from signal import SIGINT, signal
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from tempfile import mkdtemp
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from plugin_protocol import PluginProtocolServer
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multiprocessing.set_start_method("fork")
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# only useable by the python backend
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class PluginProtocolClient(Protocol):
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def __init__(self, backend, logger) -> None:
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super().__init__()
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self.backend = backend
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self.logger = logger
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def connection_made(self, transport):
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self.transport = transport
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def data_received(self, data: bytes) -> None:
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message = json.loads(data.decode("utf-8"))
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message_id = str(uuid.UUID(message["id"]))
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message_type = message["type"]
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payload = message["payload"]
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self.logger.debug(f"received {message_id} {message_type} {payload}")
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if message_type == "method_call":
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get_event_loop().create_task(self.handle_method_call(message_id, payload["name"], payload["args"]))
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async def handle_method_call(self, message_id, method_name, method_args):
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try:
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result = await self.backend.execute_method(method_name, method_args)
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self.respond_message(message_id, "method_response", dict(success = True, result = result))
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except AttributeError as e:
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self.respond_message(message_id, "method_response", dict(success = False, result = f"plugin does not expose a method called {method_name}"))
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except Exception as e:
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self.respond_message(message_id, "method_response", dict(success = False, result = str(e)))
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def respond_message(self, message_id, message_type, payload):
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self.logger.debug(f"sending {message_id} {message_type} {payload}")
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message = json.dumps(dict(id = str(message_id), type = message_type, payload = payload))
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self.transport.write(message.encode('utf-8'))
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class PythonPlugin:
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def __init__(self, plugin_directory, file_name, flags, logger) -> None:
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self.client = PluginProtocolClient(self, logger)
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self.server = PluginProtocolServer(self)
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self.connection = None
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self.plugin_directory = plugin_directory
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self.file_name = file_name
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self.flags = flags
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self.logger = logger
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def _init(self):
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self.logger.debug(f"child process Initializing")
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signal(SIGINT, lambda s, f: exit(0))
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set_event_loop(new_event_loop())
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# TODO: both processes can access the socket
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# setuid(0 if "root" in self.flags else 1000)
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spec = spec_from_file_location("_", join(self.plugin_directory, self.file_name))
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module = module_from_spec(spec)
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spec.loader.exec_module(module)
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self.Plugin = module.Plugin
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if hasattr(self.Plugin, "_main"):
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self.logger.debug("Found _main, calling it")
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get_event_loop().create_task(self.Plugin._main(self.Plugin))
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get_event_loop().create_task(self._connect())
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get_event_loop().run_forever()
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async def _connect(self):
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self.logger.debug(f"connecting to unix server on {self.unix_socket_path}")
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await get_event_loop().create_unix_connection(lambda: self.client, path=self.unix_socket_path)
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async def start(self):
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if self.connection:
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self.connection.close()
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self.unix_socket_path = PythonPlugin.generate_socket_path()
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self.logger.debug(f"starting unix server on {self.unix_socket_path}")
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self.connection = await get_event_loop().create_unix_server(lambda: self.server, path=self.unix_socket_path)
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self.process = multiprocessing.Process(target=self._init)
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self.process.start()
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get_event_loop().create_task(self.process_loop())
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async def process_loop(self):
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await get_event_loop().run_in_executor(None, self.process.join)
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self.logger.info("backend process was killed - restarting in 10 seconds")
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await sleep(10)
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await self.start()
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# called on the server/loader process
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async def call_method(self, method_name, method_args):
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if not self.process.is_alive():
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return dict(success = False, result = "Process not alive")
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return await self.server.call_method(method_name, method_args)
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# called on the client
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def execute_method(self, method_name, method_args):
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return getattr(self.Plugin, method_name)(self.Plugin, **method_args)
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def generate_socket_path():
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tmp_dir = mkdtemp("decky-plugin")
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os.chown(tmp_dir, 1000, 1000)
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return join(tmp_dir, "socket")
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