[bugzillarest] Add time to first attention on enriched indices

The time to first attention is the time expressed in days
between the ticket creation and the first comment from a
contributor different from the author creating the bug.
The field added to the indices is 'time_to_fist_attention'.

Signed-off-by: Santiago Dueñas <sduenas@bitergia.com>

grimoire_elk/enriched/bugzillarest.py

@@ -138,6 +138,7 @@ def get_rich_item(self, item):
         eitem['comments'] = 0
         eitem['number_of_comments'] = 0
         eitem['time_to_last_update_days'] = None
+        eitem['time_to_first_attention'] = None
         eitem['url'] = None
 
         # Add the field to know if the ticket is open
@@ -155,6 +156,9 @@ def get_rich_item(self, item):
         if 'is_open' in issue and not issue['is_open']:
             eitem['timeopen_days'] = eitem['time_to_last_update_days']
 
+        eitem['time_to_first_attention'] = \
+            get_time_diff_days(eitem['creation_ts'], self.get_time_to_first_attention(issue))
+
         eitem['changes'] = 0
         for history in issue['history']:
             if 'changes' in history:
@@ -177,3 +181,28 @@ def get_rich_item(self, item):
         self.add_repository_labels(eitem)
         self.add_metadata_filter_raw(eitem)
         return eitem
+
+    def get_time_to_first_attention(self, item):
+        """Set the time to first attention.
+
+        This date is defined as the first date at which a comment by someone
+        other than the user who created the issue.
+        """
+        if 'comments' not in item:
+            return None
+
+        comment_dates = []
+        creator = item['creator']
+
+        # First comment is the description of the issue
+        # Real comments start at the second position (index 1)
+        for comment in item['comments'][1:]:
+            user = comment['creator']
+            if user == creator:
+                continue
+            comment_dates.append(str_to_datetime(comment['time']).replace(tzinfo=None))
+
+        if comment_dates:
+            return min(comment_dates)
+        else:
+            return None

tests/test_bugzillarest.py

@@ -91,6 +91,18 @@ def test_enrich_keywords(self):
         eitem = enrich_backend.get_rich_item(item)
         self.assertEqual(eitem['keywords'], ['crash', 'regression'])
 
+    def test_time_to_first_attention(self):
+        """Test whether time_to_first_attention is calculated"""
+
+        self._test_raw_to_enrich()
+        enrich_backend = self.connectors[self.connector][2]()
+
+        expected = [7.23, 0.03, 0.2, 2.31, 9.88, None, None]
+
+        for index in range(0, len(self.items)):
+            eitem = enrich_backend.get_rich_item(self.items[index])
+            self.assertEqual(eitem['time_to_first_attention'], expected[index])
+
     def test_raw_to_enrich_sorting_hat(self):
         """Test enrich with SortingHat"""