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import multiprocessing
from asyncio import (Lock, get_event_loop, new_event_loop,
open_unix_connection, set_event_loop, sleep,
start_unix_server, IncompleteReadError, LimitOverrunError)
from concurrent.futures import ProcessPoolExecutor
from importlib.util import module_from_spec, spec_from_file_location
from json import dumps, load, loads
from logging import getLogger
from traceback import format_exc
from os import path, setgid, setuid
from signal import SIGINT, signal
from sys import exit
from time import time
multiprocessing.set_start_method("fork")
BUFFER_LIMIT = 2 ** 20 # 1 MiB
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()
self.version = None
json = load(open(path.join(plugin_path, plugin_directory, "plugin.json"), "r"))
if path.isfile(path.join(plugin_path, plugin_directory, "package.json")):
package_json = load(open(path.join(plugin_path, plugin_directory, "package.json"), "r"))
self.version = package_json["version"]
self.legacy = False
self.main_view_html = json["main_view_html"] if "main_view_html" in json else ""
self.tile_view_html = json["tile_view_html"] if "tile_view_html" in json else ""
self.legacy = self.main_view_html or self.tile_view_html
self.name = json["name"]
self.author = json["author"]
self.flags = json["flags"]
self.log = getLogger("plugin")
self.passive = not path.isfile(self.file)
def __str__(self) -> str:
return self.name
def _init(self):
try:
signal(SIGINT, lambda s, f: exit(0))
set_event_loop(new_event_loop())
if self.passive:
return
setgid(0 if "root" in self.flags else 1000)
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()
except:
self.log.error("Failed to start " + self.name + "!\n" + format_exc())
exit(0)
async def _setup_socket(self):
self.socket = await start_unix_server(self._listen_for_method_call, path=self.socket_addr, limit=BUFFER_LIMIT)
async def _listen_for_method_call(self, reader, writer):
while True:
line = bytearray()
while True:
try:
line.extend(await reader.readuntil())
except LimitOverrunError:
line.extend(await reader.read(reader._limit))
continue
except IncompleteReadError as err:
line.extend(err.partial)
break
else:
break
data = loads(line.decode("utf-8"))
if "stop" in data:
get_event_loop().stop()
while get_event_loop().is_running():
await sleep(0)
get_event_loop().close()
return
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:
retries = 0
while retries < 10:
try:
self.reader, self.writer = await open_unix_connection(self.socket_addr, limit=BUFFER_LIMIT)
return True
except:
await sleep(2)
retries += 1
return False
else:
return True
def start(self):
if self.passive:
return self
multiprocessing.Process(target=self._init).start()
return self
def stop(self):
if self.passive:
return
async def _(self):
if await self._open_socket_if_not_exists():
self.writer.write((dumps({"stop": True})+"\n").encode("utf-8"))
await self.writer.drain()
self.writer.close()
get_event_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:
if await self._open_socket_if_not_exists():
self.writer.write(
(dumps({"method": method_name, "args": kwargs})+"\n").encode("utf-8"))
await self.writer.drain()
line = bytearray()
while True:
try:
line.extend(await self.reader.readuntil())
except LimitOverrunError:
line.extend(await self.reader.read(self.reader._limit))
continue
except IncompleteReadError as err:
line.extend(err.partial)
break
else:
break
res = loads(line.decode("utf-8"))
if not res["success"]:
raise Exception(res["res"])
return res["res"]
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