fix: Negative time duration for labels applied after issue close; Inflated metric numbers for unlabeled labels on open issues

labels.py

@@ -43,6 +43,7 @@ def get_label_metrics(issue: github3.issues.Issue, labels: List[str]) -> dict:
     """
     label_metrics: dict = {}
     label_events = get_label_events(issue, labels)
+    label_last_event_type: dict = {}
 
     for label in labels:
         label_metrics[label] = None
@@ -55,6 +56,12 @@ def get_label_metrics(issue: github3.issues.Issue, labels: List[str]) -> dict:
 
     # Calculate the time to add or subtract to the time spent in label based on the label events
     for event in label_events:
+        # Skip labeling events that have occured past issue close time
+        if issue.closed_at is not None and (
+            event.created_at >= datetime.fromisoformat(issue.closed_at)
+        ):
+            continue
+
         if event.event == "labeled":
             labeled[event.label["name"]] = True
             if event.label["name"] in labels:
@@ -63,6 +70,7 @@ def get_label_metrics(issue: github3.issues.Issue, labels: List[str]) -> dict:
                 label_metrics[
                     event.label["name"]
                 ] -= event.created_at - datetime.fromisoformat(issue.created_at)
+                label_last_event_type[event.label["name"]] = "labeled"
         elif event.event == "unlabeled":
             unlabeled[event.label["name"]] = True
             if event.label["name"] in labels:
@@ -71,16 +79,20 @@ def get_label_metrics(issue: github3.issues.Issue, labels: List[str]) -> dict:
                 label_metrics[
                     event.label["name"]
                 ] += event.created_at - datetime.fromisoformat(issue.created_at)
+                label_last_event_type[event.label["name"]] = "unlabeled"
 
     for label in labels:
-        # if the label is still on there, add the time from the last event to now
         if label in labeled:
             # if the issue is closed, add the time from the issue creation to the closed_at time
             if issue.state == "closed":
                 label_metrics[label] += datetime.fromisoformat(
                     issue.closed_at
                 ) - datetime.fromisoformat(issue.created_at)
             else:
+                # skip label if last labeling event is 'unlabled' and issue is still open
+                if label_last_event_type[label] == "unlabeled":
+                    continue
+
                 # if the issue is open, add the time from the issue creation to now
                 label_metrics[label] += datetime.now(pytz.utc) - datetime.fromisoformat(
                     issue.created_at

test_labels.py

@@ -40,6 +40,12 @@ def setUp(self):
                 label={"name": "bug"},
                 created_at=datetime(2021, 1, 4, tzinfo=pytz.UTC),
             ),
+            # Label labeled after issue close date
+            MagicMock(
+                event="labeled",
+                label={"name": "foo"},
+                created_at=datetime(2021, 1, 20, tzinfo=pytz.UTC),
+            ),
         ]
 
     def test_get_label_events(self):
@@ -80,6 +86,13 @@ def test_get_label_metrics_open_issue(self):
             datetime.now(pytz.utc) - datetime(2021, 1, 4, tzinfo=pytz.UTC),
         )
 
+    def test_get_label_metrics_closed_issue_labeled_past_closed_at(self):
+        """Test get_label_metrics using a closed issue that was labeled past issue closed_at"""
+        self.issue.state = "closed"
+        labels = ["foo"]
+        metrics = get_label_metrics(self.issue, labels)
+        self.assertEqual(metrics["foo"], None)
+
 
 class TestGetAverageTimeInLabels(unittest.TestCase):
     """Unit tests for get_stats_time_in_labels"""