Improve task statistics

allianceauth/authentication/task_statistics/counters.py

@@ -0,0 +1,40 @@
+from collections import namedtuple
+import datetime as dt
+
+from .event_series import EventSeries
+
+
+"""Global series for counting task events."""
+succeeded_tasks = EventSeries("SUCCEEDED_TASKS")
+retried_tasks = EventSeries("RETRIED_TASKS")
+failed_tasks = EventSeries("FAILED_TASKS")
+
+
+_TaskCounts = namedtuple(
+    "_TaskCounts", ["succeeded", "retried", "failed", "total", "earliest_task", "hours"]
+)
+
+
+def dashboard_results(hours: int) -> _TaskCounts:
+    """Counts of all task events within the given timeframe."""
+
+    def earliest_if_exists(events: EventSeries, earliest: dt.datetime) -> list:
+        my_earliest = events.first_event(earliest=earliest)
+        return [my_earliest] if my_earliest else []
+
+    earliest = dt.datetime.utcnow() - dt.timedelta(hours=hours)
+    earliest_events = list()
+    succeeded_count = succeeded_tasks.count(earliest=earliest)
+    earliest_events += earliest_if_exists(succeeded_tasks, earliest)
+    retried_count = retried_tasks.count(earliest=earliest)
+    earliest_events += earliest_if_exists(retried_tasks, earliest)
+    failed_count = failed_tasks.count(earliest=earliest)
+    earliest_events += earliest_if_exists(failed_tasks, earliest)
+    return _TaskCounts(
+        succeeded=succeeded_count,
+        retried=retried_count,
+        failed=failed_count,
+        total=succeeded_count + retried_count + failed_count,
+        earliest_task=min(earliest_events) if earliest_events else None,
+        hours=hours,
+    )