Refactor forwarder and implement clock service

rpi/models/clock.py

@@ -1,9 +1,17 @@
 import threading
 import time
 from datetime import datetime
+from typing import Callable
 
 
 class Clock:
+
+    millis : int
+    increment : int
+
+    on_update : Callable[[str], None]
+    on_terminated : Callable[[], None]
+
     def __init__(self, value: int, increment: int) -> None:
         self.millis = value * 1000
         self.increment = increment * 1000
@@ -14,8 +22,6 @@ class Clock:
 
         self.thread = threading.Thread(target=self._update_clock, daemon=True)
 
-    # ---------- time computation ----------
-
     def _compute_seconds(self) -> int:
         return (self.millis // 1000) % 60
 
@@ -25,8 +31,6 @@ class Clock:
     def _add_increment(self) -> None:
         self.millis += self.increment
 
-    # ---------- thread logic ----------
-
     def _update_clock(self):
         while not self._terminate_event.is_set():
             self._run_event.wait()
@@ -35,12 +39,26 @@ class Clock:
                 if self.millis <= 0:
                     self.millis = 0
                     self._run_event.clear()
+                    self.__notify_update()
                     break
 
                 self.millis -= 1
+                self.__notify_update()
 
             time.sleep(0.001)
-    # ---------- public API ----------
+
+    def __notify_update(self):
+        self.on_update(self.clock_to_str())
+
+    def __notify_terminated(self):
+        self.on_terminated()
+
+    def set_on_update(self, callback : Callable[[str], None]):
+        self.on_update = callback
+
+    def set_on_terminated(self, callback: Callable[[], None]):
+        self.on_terminated = callback
+
     def is_running(self) -> bool:
         return self._run_event.is_set()