add option to filter alerts by component

conf.py

@@ -45,6 +45,7 @@ def load_and_validate_config(path):
         ),
         alerts=ConfigWrapper(
             brightness=max(int(config.get('alerts', {}).get('brightness', 255)), 10),
+            filters=sorted(config.get('alerts', {}).get('filters', set())),
         ),
         rainbow=ConfigWrapper(
             enable=bool(config.get('rainbow', {}).get('enable', True) is True),

config.example.toml

@@ -30,6 +30,11 @@ universe = 1
 # rainbow brightness (see below).
 brightness = 255
 
+# Filter by specific components. If this list is non-empty, the message
+# will get shown if atleast one of these filters match. The filters are
+# applied by using re.search() on the component part of the message.
+filters = []
+
 
 [rainbow]
 # Wether to enable the rainbow 'no alerts' loop. If false, all other

mqtt_queue.py

@@ -46,12 +46,23 @@ class MQTTQueue:
 
             text = re.sub(r'\<[a-z\/]+\>', '', data['msg'])
 
-            self.queue.put(
+            add_to_queue = True
-                (
+            if self.config.alerts.filters:
-                    data['level'].lower(),
+                add_to_queue = False
-                    data['component'],
+                for f in self.config.alerts.filters:
-                    text,
+                    if re.search(f, data['component'], re.IGNORECASE):
+                        add_to_queue = True
+                        break # no point in searching further
+
+            if add_to_queue:
+                self.queue.put(
+                    (
+                        data['level'].lower(),
+                        data['component'],
+                        text,
+                    )
                 )
-            )
+            else:
+                LOG.info(f'Ignoring message for {data["component"]} because it was filtered')
         except Exception as e:
             LOG.exception(msg.payload)