Added libs

fspn/utils/observable.py

@@ -0,0 +1,44 @@
+from .wrapper_util import threaded
+import logging, traceback
+
+class Event(object):
+    def __init__(self):
+        self.source = self
+
+class Observable(object):
+    """
+    A simple publish-subscribe system.
+    """
+
+    def __init__(self, events = []):
+        self.events: dict[str, list] = {}
+        for event in events:
+            self.register_event(event)
+    
+    def register_event(self, event):
+        if(event not in self.events):
+            self.events[event] = []
+    
+    def subscribe_event(self, event, callback):
+        if(event not in self.events):
+            self.register_event(event)
+        self.events[event].append(callback)
+    
+    @threaded
+    def fire_event(self, event, **kwargs):
+        e = Event()
+        e.source = self
+        for k, v in kwargs.items():
+            setattr(e, k, v)
+        if(event in self.events):
+            for fn in self.events[event]:
+                self.call_observer(fn, e)
+        else:
+            logging.warning(f"Event {event} without callback")
+    
+    @threaded
+    def call_observer(self, function, event):
+        try:
+            function(event)
+        except Exception as ex:
+            logging.exception(f'Error in event {event} to function {function.__name__}')