First draft of backend independent plugins

1 files changed, 0 insertions, 115 deletions

diff --git a/backend/plugin.py b/backend/plugin.py
deleted file mode 100644
index 11c94a05..00000000
--- a/backend/plugin.py
+++ /dev/null
@@ -1,115 +0,0 @@
-import multiprocessing
-from asyncio import (Lock, get_event_loop, new_event_loop,
-                     open_unix_connection, set_event_loop, sleep,
-                     start_unix_server)
-from concurrent.futures import ProcessPoolExecutor
-from importlib.util import module_from_spec, spec_from_file_location
-from json import dumps, load, loads
-from os import path, setuid
-from signal import SIGINT, signal
-from sys import exit
-from time import time
-
-multiprocessing.set_start_method("fork")
-
-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.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.passive = not path.isfile(self.file)
-
-    def __str__(self) -> str:
-        return self.name
-
-    def _init(self):
-        signal(SIGINT, lambda s, f: exit(0))
-
-        set_event_loop(new_event_loop())
-        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:
-                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:
-            while True:
-                try:
-                    self.reader, self.writer = await open_unix_connection(self.socket_addr)
-                    break
-                except:
-                    await sleep(0)
-
-    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):
-            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:
-            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"]