feat: webserver: keep alive; move playback write prot to handler

- Reset the app idle timer when interacting with the webapp, so that the
  device does not turn off while the web ui is used.

- Handle denying put/post while playback is active centrally in the
  before_request handler, so that it does not need to be copy/pasted
  into every request handler.

Signed-off-by: Matthias Blankertz <matthias@blankertz.org>

software/src/app.py

@@ -116,6 +116,10 @@ class PlayerApp:
             # Check again in a minute
             self.timer_manager.schedule(time.ticks_ms() + self.idle_timeout_ms, self.onIdleTimeout)
 
+    def reset_idle_timeout(self):
+        if not self.playing:
+            self.timer_manager.schedule(time.ticks_ms() + self.idle_timeout_ms, self.onIdleTimeout)
+
     def is_playing(self) -> bool:
         return self.playing
 

software/src/webserver.py

@@ -20,6 +20,13 @@ def start_webserver(config_, app_):
     app = app_
 
 
+@webapp.before_request
+async def before_request_handler(request):
+    if request.method in ['PUT', 'POST'] and app.is_playing():
+        return "Cannot write to device while playback is active", 503
+    app.reset_idle_timeout()
+
+
 @webapp.route('/')
 async def index(request):
     print("wohoo, a guest :)")
@@ -52,8 +59,6 @@ async def config_get(request):
 
 @webapp.route('/api/v1/config', methods=['PUT'])
 async def config_put(request):
-    if app.is_playing():
-        return 503
     try:
         config.set_config(request.json)
     except ValueError as ex: