attempt to add plugin events to the plugin frontend api.

unable to test right now though

backend/decky_loader/loader.py

@@ -8,7 +8,6 @@ from typing import Any, Tuple, Dict
 
 from aiohttp import web
 from os.path import exists
-from attr import dataclass
 from watchdog.events import RegexMatchingEventHandler, DirCreatedEvent, DirModifiedEvent, FileCreatedEvent, FileModifiedEvent # type: ignore
 from watchdog.observers import Observer # type: ignore
 
@@ -66,12 +65,6 @@ class FileChangeHandler(RegexMatchingEventHandler):
         self.logger.debug(f"file modified: {src_path}")
         self.maybe_reload(src_path)
 
-@dataclass
-class PluginEvent:
-    plugin_name: str
-    event: str
-    data: str
-
 class Loader:
     def __init__(self, server_instance: PluginManager, ws: WSRouter, plugin_path: str, loop: AbstractEventLoop, live_reload: bool = False) -> None:
         self.loop = loop
@@ -149,10 +142,9 @@ class Loader:
 
     def import_plugin(self, file: str, plugin_directory: str, refresh: bool | None = False, batch: bool | None = False):
         try:
-            async def plugin_emitted_event(event: str, data: Any):
-                self.logger.debug(f"PLUGIN EMITTED EVENT: {str(event)} {data}")
-                event_data = PluginEvent(plugin_name=plugin.name, event=event, data=data)
-                await self.ws.emit("loader/plugin_event", event_data)
+            async def plugin_emitted_event(event: str, args: Any):
+                self.logger.debug(f"PLUGIN EMITTED EVENT: {event} with args {args}")
+                await self.ws.emit(f"loader/plugin_event", {plugin:plugin.name, event:event, args:args})
 
             plugin = PluginWrapper(file, plugin_directory, self.plugin_path, plugin_emitted_event)
             if plugin.name in self.plugins:

backend/decky_loader/plugin/imports/decky.py

@@ -19,7 +19,7 @@ import subprocess
 import logging
 import time
 
-from typing import TypeVar, Type
+from typing import Any
 
 """
 Constants
@@ -213,9 +213,8 @@ logger.setLevel(logging.INFO)
 """
 Event handling
 """
-DataType = TypeVar("DataType")
 # TODO better docstring im lazy
-async def emit(event: str, data: DataType | None = None, data_type: Type[DataType] | None = None) -> None:
+async def emit(event: str, *args: Any) -> None:
     """
     Send an event to the frontend.
     """

backend/decky_loader/plugin/imports/decky.pyi

@@ -16,7 +16,7 @@ __version__ = '0.1.0'
 
 import logging
 
-from typing import TypeVar, Type
+from typing import Any
 
 """
 Constants
@@ -177,9 +177,8 @@ logger: logging.Logger
 """
 Event handling
 """
-DataType = TypeVar("DataType")
 # TODO better docstring im lazy
-async def emit(event: str, data: DataType | None = None, data_type: Type[DataType] | None = None) -> None:
+async def emit(event: str, *args: Any) -> None:
     """
     Send an event to the frontend.
     """

backend/decky_loader/plugin/plugin.py

@@ -59,7 +59,7 @@ class PluginWrapper:
                 if line != None:
                     res = loads(line)
                     if res["type"] == SocketMessageType.EVENT.value:
-                        create_task(self.emitted_event_callback(res["event"], res["data"]))
+                        create_task(self.emitted_event_callback(res["event"], res["args"]))
                     elif res["type"] == SocketMessageType.RESPONSE.value:
                         self._method_call_requests.pop(res["id"]).set_result(res)
             except:

backend/decky_loader/plugin/sandboxed_plugin.py

@@ -14,7 +14,7 @@ from ..localplatform.localplatform import setgid, setuid, get_username, get_home
 from ..enums import UserType
 from .. import helpers
 
-from typing import List, TypeVar, Type
+from typing import List, TypeVar, Any
 
 DataType = TypeVar("DataType")
 
@@ -83,11 +83,11 @@ class SandboxedPlugin:
                 sysmodules[key.replace("decky_loader.", "")] = sysmodules[key]
             
             from .imports import decky
-            async def emit(event: str, data: DataType | None = None, data_type: Type[DataType] | None = None) -> None:
+            async def emit(event: str, *args: Any) -> None:
                 await self._socket.write_single_line_server(dumps({
                     "type": SocketMessageType.EVENT,
                     "event": event,
-                    "data": data
+                    "args": args
                 }))
             # copy the docstring over so we don't have to duplicate it
             emit.__doc__ = decky.emit.__doc__

frontend/src/plugin-loader.tsx

@@ -48,6 +48,9 @@ declare global {
   }
 }
 
+/** Map of event names to event listeners */
+type listenerMap = Map<string, Set<(...args: any) => any>>;
+
 const callPluginMethod = DeckyBackend.callable<[pluginName: string, method: string, ...args: any], any>(
   'loader/call_plugin_method',
 );
@@ -58,6 +61,8 @@ class PluginLoader extends Logger {
   private routerHook: RouterHook = new RouterHook();
   public toaster: Toaster = new Toaster();
   private deckyState: DeckyState = new DeckyState();
+  // stores a map of plugin names to all their event listeners
+  private pluginEventListeners: Map<string, listenerMap> = new Map();
 
   public frozenPluginsService = new FrozenPluginService(this.deckyState);
   public hiddenPluginsService = new HiddenPluginsService(this.deckyState);
@@ -81,6 +86,7 @@ class PluginLoader extends Logger {
     DeckyBackend.addEventListener('updater/update_download_percentage', () => {
       this.deckyState.setIsLoaderUpdating(true);
     });
+    DeckyBackend.addEventListener(`loader/plugin_event`, this.pluginEventListener);
 
     this.tabsHook.init();
 
@@ -513,6 +519,9 @@ class PluginLoader extends Logger {
           throw new Error(`Plugin ${pluginName} requested invalid backend api version ${version}.`);
         }
 
+        const eventListeners: listenerMap = new Map();
+        this.pluginEventListeners.set(pluginName, eventListeners);
+
         const backendAPI = {
           call: (methodName: string, ...args: any) => {
             return callPluginMethod(pluginName, methodName, ...args);
@@ -520,6 +529,20 @@ class PluginLoader extends Logger {
           callable: (methodName: string) => {
             return (...args: any) => callPluginMethod(pluginName, methodName, ...args);
           },
+          addEventListener: (event: string, listener: (...args: any) => any) => {
+            if (!eventListeners.has(event)) {
+              eventListeners.set(event, new Set([listener]));
+            } else {
+              eventListeners.get(event)?.add(listener);
+            }
+            return listener;
+          },
+          removeEventListener: (event: string, listener: (...args: any) => any) => {
+            if (eventListeners.has(event)) {
+              const set = eventListeners.get(event);
+              set?.delete(listener);
+            }
+          },
         };
 
         this.debug(`${pluginName} connected to backend API.`);
@@ -528,6 +551,29 @@ class PluginLoader extends Logger {
     };
   }
 
+  pluginEventListener = (data: { plugin: string; event: string; args: any }) => {
+    const { plugin, event, args } = data;
+    this.debug(`Recieved plugin event ${event} for ${plugin} with args`, args);
+    if (!this.pluginEventListeners.has(plugin)) {
+      this.warn(`plugin ${plugin} does not have event listeners`);
+      return;
+    }
+    const eventListeners = this.pluginEventListeners.get(plugin)!;
+    if (eventListeners.has(event)) {
+      for (const listener of eventListeners.get(event)!) {
+        (async () => {
+          try {
+            await listener(...args);
+          } catch (e) {
+            this.error(`error in event ${event}`, e, listener);
+          }
+        })();
+      }
+    } else {
+      this.warn(`event ${event} has no listeners`);
+    }
+  };
+
   createLegacyPluginAPI(pluginName: string) {
     const pluginAPI = {
       routerHook: this.routerHook,