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from __future__ import annotations
from asyncio import AbstractEventLoop, Queue, sleep
from json.decoder import JSONDecodeError
from logging import getLogger
from os import listdir, path
from pathlib import Path
from traceback import print_exc
from typing import Any, Tuple
from aiohttp import web
from os.path import exists
from watchdog.events import RegexMatchingEventHandler, DirCreatedEvent, DirModifiedEvent, FileCreatedEvent, FileModifiedEvent # type: ignore
from watchdog.observers import Observer # type: ignore
from typing import TYPE_CHECKING
if TYPE_CHECKING:
from .main import PluginManager
from .injector import get_tab, get_gamepadui_tab
from .plugin import PluginWrapper
Plugins = dict[str, PluginWrapper]
ReloadQueue = Queue[Tuple[str, str, bool | None] | Tuple[str, str]]
class FileChangeHandler(RegexMatchingEventHandler):
def __init__(self, queue: ReloadQueue, plugin_path: str) -> None:
super().__init__(regexes=[r'^.*?dist\/index\.js$', r'^.*?main\.py$']) # type: ignore
self.logger = getLogger("file-watcher")
self.plugin_path = plugin_path
self.queue = queue
self.disabled = True
def maybe_reload(self, src_path: str):
if self.disabled:
return
plugin_dir = Path(path.relpath(src_path, self.plugin_path)).parts[0]
if exists(path.join(self.plugin_path, plugin_dir, "plugin.json")):
self.queue.put_nowait((path.join(self.plugin_path, plugin_dir, "main.py"), plugin_dir, True))
def on_created(self, event: DirCreatedEvent | FileCreatedEvent):
src_path = event.src_path
if "__pycache__" in src_path:
return
# check to make sure this isn't a directory
if path.isdir(src_path):
return
# get the directory name of the plugin so that we can find its "main.py" and reload it; the
# file that changed is not necessarily the one that needs to be reloaded
self.logger.debug(f"file created: {src_path}")
self.maybe_reload(src_path)
def on_modified(self, event: DirModifiedEvent | FileModifiedEvent):
src_path = event.src_path
if "__pycache__" in src_path:
return
# check to make sure this isn't a directory
if path.isdir(src_path):
return
# get the directory name of the plugin so that we can find its "main.py" and reload it; the
# file that changed is not necessarily the one that needs to be reloaded
self.logger.debug(f"file modified: {src_path}")
self.maybe_reload(src_path)
class Loader:
def __init__(self, server_instance: PluginManager, plugin_path: str, loop: AbstractEventLoop, live_reload: bool = False) -> None:
self.loop = loop
self.logger = getLogger("Loader")
self.plugin_path = plugin_path
self.logger.info(f"plugin_path: {self.plugin_path}")
self.plugins: Plugins = {}
self.watcher = None
self.live_reload = live_reload
self.reload_queue: ReloadQueue = Queue()
self.loop.create_task(self.handle_reloads())
if live_reload:
self.observer = Observer()
self.watcher = FileChangeHandler(self.reload_queue, plugin_path)
self.observer.schedule(self.watcher, self.plugin_path, recursive=True) # type: ignore
self.observer.start()
self.loop.create_task(self.enable_reload_wait())
server_instance.web_app.add_routes([
web.get("/frontend/{path:.*}", self.handle_frontend_assets),
web.get("/locales/{path:.*}", self.handle_frontend_locales),
web.get("/plugins", self.get_plugins),
web.get("/plugins/{plugin_name}/frontend_bundle", self.handle_frontend_bundle),
web.post("/plugins/{plugin_name}/methods/{method_name}", self.handle_plugin_method_call),
web.get("/plugins/{plugin_name}/assets/{path:.*}", self.handle_plugin_frontend_assets),
web.post("/plugins/{plugin_name}/reload", self.handle_backend_reload_request)
])
async def enable_reload_wait(self):
if self.live_reload:
await sleep(10)
if self.watcher:
self.logger.info("Hot reload enabled")
self.watcher.disabled = False
async def handle_frontend_assets(self, request: web.Request):
file = path.join(path.dirname(__file__), "..", "static", request.match_info["path"])
return web.FileResponse(file, headers={"Cache-Control": "no-cache"})
async def handle_frontend_locales(self, request: web.Request):
req_lang = request.match_info["path"]
file = path.join(path.dirname(__file__), "..", "locales", req_lang)
if exists(file):
return web.FileResponse(file, headers={"Cache-Control": "no-cache", "Content-Type": "application/json"})
else:
self.logger.info(f"Language {req_lang} not available, returning an empty dictionary")
return web.json_response(data={}, headers={"Cache-Control": "no-cache"})
async def get_plugins(self, request: web.Request):
plugins = list(self.plugins.values())
return web.json_response([{"name": str(i), "version": i.version} for i in plugins])
async def handle_plugin_frontend_assets(self, request: web.Request):
plugin = self.plugins[request.match_info["plugin_name"]]
file = path.join(self.plugin_path, plugin.plugin_directory, "dist/assets", request.match_info["path"])
return web.FileResponse(file, headers={"Cache-Control": "no-cache"})
async def handle_frontend_bundle(self, request: web.Request):
plugin = self.plugins[request.match_info["plugin_name"]]
with open(path.join(self.plugin_path, plugin.plugin_directory, "dist/index.js"), "r", encoding="utf-8") as bundle:
return web.Response(text=bundle.read(), content_type="application/javascript")
def import_plugin(self, file: str, plugin_directory: str, refresh: bool | None = False, batch: bool | None = False):
try:
plugin = PluginWrapper(file, plugin_directory, self.plugin_path)
if plugin.name in self.plugins:
if not "debug" in plugin.flags and refresh:
self.logger.info(f"Plugin {plugin.name} is already loaded and has requested to not be re-loaded")
return
else:
self.plugins[plugin.name].stop()
self.plugins.pop(plugin.name, None)
if plugin.passive:
self.logger.info(f"Plugin {plugin.name} is passive")
self.plugins[plugin.name] = plugin.start()
self.logger.info(f"Loaded {plugin.name}")
if not batch:
self.loop.create_task(self.dispatch_plugin(plugin.name, plugin.version))
except Exception as e:
self.logger.error(f"Could not load {file}. {e}")
print_exc()
async def dispatch_plugin(self, name: str, version: str | None):
gpui_tab = await get_gamepadui_tab()
await gpui_tab.evaluate_js(f"window.importDeckyPlugin('{name}', '{version}')")
def import_plugins(self):
self.logger.info(f"import plugins from {self.plugin_path}")
directories = [i for i in listdir(self.plugin_path) if path.isdir(path.join(self.plugin_path, i)) and path.isfile(path.join(self.plugin_path, i, "plugin.json"))]
for directory in directories:
self.logger.info(f"found plugin: {directory}")
self.import_plugin(path.join(self.plugin_path, directory, "main.py"), directory, False, True)
async def handle_reloads(self):
while True:
args = await self.reload_queue.get()
self.import_plugin(*args) # type: ignore
async def handle_plugin_method_call(self, request: web.Request):
res = {}
plugin = self.plugins[request.match_info["plugin_name"]]
method_name = request.match_info["method_name"]
try:
method_info = await request.json()
args: Any = method_info["args"]
except JSONDecodeError:
args = {}
try:
if method_name.startswith("_"):
raise RuntimeError("Tried to call private method")
res["result"] = await plugin.execute_method(method_name, args)
res["success"] = True
except Exception as e:
res["result"] = str(e)
res["success"] = False
return web.json_response(res)
async def handle_backend_reload_request(self, request: web.Request):
plugin_name : str = request.match_info["plugin_name"]
plugin = self.plugins[plugin_name]
await self.reload_queue.put((plugin.file, plugin.plugin_directory))
return web.Response(status=200)
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