Fix TaskResult IDs skipped in Task Results

src/handlers/health_check_handler.py

@@ -1,5 +1,6 @@
 import logging
 from pathlib import Path
+from time import sleep
 
 from django.conf import settings
 
@@ -10,3 +11,4 @@ def trigger_api_restart_callback(sender, **kwargs):
     logger.warning("triggering API container restart")
     if settings.IN_DOCKER:
         Path(settings.SDR_HEALTHCHECK_FILE).touch()
+        sleep(60) # sleep to prevent running next task until restart completed

src/scheduler/scheduler.py

@@ -94,6 +94,7 @@ def run(self, blocking=True):
 
         try:
             self.calibrate_if_needed()
+            self.reset_next_task_id()
             while True:
                 with minimum_duration(blocking):
                     self._consume_schedule(blocking)
@@ -155,7 +156,16 @@ def _initialize_task_result(self) -> TaskResult:
         """Initalize an 'in-progress' result so it exists when action runs."""
         tid = self.task.task_id
         task_result = TaskResult(schedule_entry=self.entry, task_id=tid)
+        logger.debug(f"Creating task result with task id = {tid}")
         task_result.save()
+        if tid > 1:
+            last_task_id_exists = TaskResult.objects.filter(task_id=tid-1).exists()
+            if not last_task_id_exists:
+                logger.warning(f"TaskResult for previous task id ({tid-1}) does not exist. Current task_id = {tid}")
+                # commented out code useful for debugging if this warning occurs
+                # self.entry.is_active = False
+                # self.entry.save()
+                # raise Exception(f"Task ID Mismatch! last task id = {tid-1} current task id = {tid}")
         return task_result
 
     def _call_task_action(self):
@@ -241,6 +251,7 @@ def _finalize_task_result(self, task_result, started, finished, status, detail):
             task_result.save()
 
         with self.task_status_lock:
+            self.last_status = status
             if status == "failure" and self.last_status == "failure":
                 self.consecutive_failures = self.consecutive_failures + 1
             elif status == "failure":
@@ -249,8 +260,10 @@ def _finalize_task_result(self, task_result, started, finished, status, detail):
                 self.consecutive_failures = 0
             if self.consecutive_failures >= settings.MAX_FAILURES:
                 trigger_api_restart.send(sender=self.__class__)
-
-            self.last_status = status
+                # prevent more tasks from being run
+                # restart can cause missing db task result ids
+                # if tasks continue to run waiting for restart
+                thread.stop()
 
     @staticmethod
     def _callback_response_handler(resp, task_result):
@@ -373,6 +386,17 @@ def calibrate_if_needed(self):
                     "Skipping startup calibration since sensor_calibration exists and has not expired."
                 )
 
+    def reset_next_task_id(self):
+        # reset next task id
+        for entry in self.schedule:
+            count = TaskResult.objects.filter(schedule_entry=entry).count()
+            if count > 0:
+                last_task_id = TaskResult.objects.filter(schedule_entry=entry).order_by("task_id")[count-1].task_id
+                if entry.next_task_id != last_task_id + 1:
+                    logger.info(f"Changing next_task_id from {entry.next_task_id} to {last_task_id + 1}")
+                    entry.next_task_id = last_task_id + 1
+                    entry.save(update_fields=("next_task_id",))
+
 
 @contextmanager
 def minimum_duration(blocking):