Improve profile handling

* introduce profile sources
* subscriptions can handle config change events
* web config changes to profile changes will now take effect immediately

owrx/audio/__init__.py

@@ -1,4 +1,10 @@
-from abc import ABC, abstractmethod
+from owrx.config import Config
+from abc import ABC, ABCMeta, abstractmethod
+from typing import List
+
+import logging
+
+logger = logging.getLogger(__name__)
 
 
 class AudioChopperProfile(ABC):
@@ -13,3 +19,68 @@ class AudioChopperProfile(ABC):
     @abstractmethod
     def decoder_commandline(self, file):
         pass
+
+
+class ProfileSourceSubscriber(ABC):
+    @abstractmethod
+    def onProfilesChanged(self):
+        pass
+
+
+class ProfileSource(ABC):
+    def __init__(self):
+        self.subscribers = []
+
+    @abstractmethod
+    def getProfiles(self) -> List[AudioChopperProfile]:
+        pass
+
+    def subscribe(self, subscriber: ProfileSourceSubscriber):
+        if subscriber in self.subscribers:
+            return
+        self.subscribers.append(subscriber)
+
+    def unsubscribe(self, subscriber: ProfileSourceSubscriber):
+        if subscriber not in self.subscribers:
+            return
+        self.subscribers.remove(subscriber)
+
+    def fireProfilesChanged(self):
+        for sub in self.subscribers.copy():
+            try:
+                sub.onProfilesChanged()
+            except Exception:
+                logger.exception("Error while notifying profile subscriptions")
+
+
+class ConfigWiredProfileSource(ProfileSource, metaclass=ABCMeta):
+    def __init__(self):
+        super().__init__()
+        self.configSub = None
+
+    @abstractmethod
+    def getPropertiesToWire(self) -> List[str]:
+        pass
+
+    def subscribe(self, subscriber: ProfileSourceSubscriber):
+        super().subscribe(subscriber)
+        if self.subscribers and self.configSub is None:
+            self.configSub = Config.get().filter(*self.getPropertiesToWire()).wire(self.fireProfilesChanged)
+
+    def unsubscribe(self, subscriber: ProfileSourceSubscriber):
+        super().unsubscribe(subscriber)
+        if not self.subscribers and self.configSub is not None:
+            self.configSub.cancel()
+            self.configSub = None
+
+    def fireProfilesChanged(self, *args):
+        super().fireProfilesChanged()
+
+
+class StaticProfileSource(ProfileSource):
+    def __init__(self, profiles: List[AudioChopperProfile]):
+        super().__init__()
+        self.profiles = profiles
+
+    def getProfiles(self) -> List[AudioChopperProfile]:
+        return self.profiles