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from importlib.util import spec_from_file_location, module_from_spec
from asyncio import get_event_loop, start_unix_server, open_unix_connection, sleep, Lock
from os import path, setuid
from json import loads, dumps, load
from concurrent.futures import ProcessPoolExecutor
from time import time
class PluginWrapper:
def __init__(self, file, plugin_directory, plugin_path) -> None:
self.file = file
self.plugin_directory = plugin_directory
self.reader = None
self.writer = None
self.socket_addr = f"/tmp/plugin_socket_{time()}"
self.method_call_lock = Lock()
json = load(open(path.join(plugin_path, plugin_directory, "plugin.json"), "r"))
self.name = json["name"]
self.author = json["author"]
self.main_view_html = json["main_view_html"]
self.tile_view_html = json["tile_view_html"] if "tile_view_html" in json else ""
self.flags = json["flags"]
self.passive = not path.isfile(self.file)
def _init(self):
if self.passive:
return
setuid(0 if "root" in self.flags else 1000)
spec = spec_from_file_location("_", self.file)
module = module_from_spec(spec)
spec.loader.exec_module(module)
self.Plugin = module.Plugin
if hasattr(self.Plugin, "_main"):
get_event_loop().create_task(self.Plugin._main(self.Plugin))
get_event_loop().create_task(self._setup_socket())
get_event_loop().run_forever()
async def _setup_socket(self):
self.socket = await start_unix_server(self._listen_for_method_call, path=self.socket_addr)
async def _listen_for_method_call(self, reader, writer):
while True:
data = loads((await reader.readline()).decode("utf-8"))
if "stop" in data:
return get_event_loop().stop()
d = {"res": None, "success": True}
try:
d["res"] = await getattr(self.Plugin, data["method"])(self.Plugin, **data["args"])
except Exception as e:
d["res"] = str(e)
d["success"] = False
finally:
writer.write((dumps(d)+"\n").encode("utf-8"))
await writer.drain()
async def _open_socket_if_not_exists(self):
if not self.reader:
while True:
try:
self.reader, self.writer = await open_unix_connection(self.socket_addr)
break
except:
await sleep(0)
def start(self, loop):
if self.passive:
return self
executor = ProcessPoolExecutor()
loop.run_in_executor(
executor,
self._init
)
return self
def stop(self, loop):
if self.passive:
return
async def _(self):
await self._open_socket_if_not_exists()
self.writer.write((dumps({"stop": True})+"\n").encode("utf-8"))
await self.writer.drain()
loop.create_task(_(self))
async def execute_method(self, method_name, kwargs):
if self.passive:
raise RuntimeError("This plugin is passive (aka does not implement main.py)")
async with self.method_call_lock:
await self._open_socket_if_not_exists()
self.writer.write(
(dumps({"method": method_name, "args": kwargs})+"\n").encode("utf-8"))
await self.writer.drain()
res = loads((await self.reader.readline()).decode("utf-8"))
if not res["success"]:
raise Exception(res["res"])
return res["res"]
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