ntfy plugin migrated to AsyncRunnablePlugin.

This commit removes a lot of the loop management boilerplate.

platypush/plugins/ntfy/__init__.py

@@ -1,8 +1,6 @@
 import asyncio
 import json
-import multiprocessing
 import os
-import time
 from typing import Optional, Collection, Mapping
 
 import requests
@@ -11,11 +9,10 @@ import websockets.exceptions
 
 from platypush.context import get_bus
 from platypush.message.event.ntfy import NotificationEvent
-from platypush.plugins import RunnablePlugin, action
-from platypush.context import get_or_create_event_loop
+from platypush.plugins import AsyncRunnablePlugin, action
 
 
-class NtfyPlugin(RunnablePlugin):
+class NtfyPlugin(AsyncRunnablePlugin):
     """
     Ntfy integration.
 
@@ -50,7 +47,6 @@ class NtfyPlugin(RunnablePlugin):
         )
 
         self._subscriptions = subscriptions or []
-        self._ws_proc = None
 
     async def _get_ws_handler(self, url):
         reconnect_wait_secs = 1
@@ -60,7 +56,7 @@ class NtfyPlugin(RunnablePlugin):
             self.logger.debug(f'Connecting to {url}')
 
             try:
-                async with websockets.connect(url) as ws:
+                async with websockets.connect(url) as ws:  # type: ignore
                     reconnect_wait_secs = 1
                     self.logger.info(f'Connected to {url}')
                     async for msg in ws:
@@ -91,45 +87,22 @@ class NtfyPlugin(RunnablePlugin):
                             )
             except websockets.exceptions.WebSocketException as e:
                 self.logger.error('Websocket error: %s', e)
-                time.sleep(reconnect_wait_secs)
+                await asyncio.sleep(reconnect_wait_secs)
                 reconnect_wait_secs = min(
                     reconnect_wait_secs * 2, reconnect_wait_secs_max
                 )
 
-    def _ws_process(self):
-        loop = get_or_create_event_loop()
-        try:
-            loop.run_until_complete(
-                asyncio.wait(
-                    {
+    async def listen(self):
+        return await asyncio.wait(
+            [
                 self._get_ws_handler(f'{self._ws_url}/{sub}/ws')
-                        for sub in self._subscriptions
-                    }
+                for sub in set(self._subscriptions)
+            ]
         )
-            )
-        except KeyboardInterrupt:
-            pass
 
-    def main(self):
-        if self.should_stop() or (self._ws_proc and self._ws_proc.is_alive()):
-            self.logger.debug('Already connected')
-            return
-
-        if self._subscriptions:
-            self._ws_proc = multiprocessing.Process(target=self._ws_process)
-            self._ws_proc.start()
-
-        self.wait_stop()
-
-    def stop(self):
-        if self._ws_proc and self._ws_proc.is_alive():
-            self._ws_proc.terminate()
-            try:
-                self._ws_proc.join(timeout=3)
-            except TimeoutError:
-                self._ws_proc.kill()
-
-        super().stop()
+    @property
+    def _should_start_runner(self):
+        return bool(self._subscriptions)
 
     @action
     def send_message(