patchforreview_remover.py: Handle bot comments for Gitlab status updates

Handle change status report for both Gerrit and Gitlab.

Bug: T325297

patchforreview_remover.py

@@ -19,6 +19,37 @@ class Checker():
         phid = self.client.lookupPhid(t_id)
         return self.phid_check(phid)
 
+    def get_change_url(self, raw_comment):
+        m = re.search(r'https://gerrit(?:-test|)\.wikimedia\.org/r/\d+', raw_comment)
+        if m:
+            return m[0]
+        m = re.search(r'https://gitlab\.wikimedia\.org/repos/.*/-/merge_requests/\d+', raw_comment)
+        if m:
+            return m[0]
+        return None
+
+    def get_operation_type(self, raw_comment, url):
+        """
+        If the operation type can be determined from raw_comment, return
+        it.  It will be the string "open" (first patchset created or merge
+        request created) or "close" (merge or abandon)
+        """
+        # Gitlab style
+        if re.search(r"opened " + re.escape(url), raw_comment):
+            return "open"
+
+        if re.search(r"(merged|closed) " + re.escape(url), raw_comment):
+            return "close"
+
+        # Gerrit style
+        if re.search(r"Change \d+ had a related patch set uploaded", raw_comment):
+            return "open"
+
+        if re.search(r'Change \d+ \*\*(?:merged|abandoned)\*\* by ', raw_comment):
+            return "close"
+
+        return None
+
     def phid_check(self, phid) -> bool:
         """
         Returns true if the Patch-For-Review project should be removed from the Phabricator
@@ -50,15 +81,14 @@ class Checker():
             if len(case['comments']) != 1:
                 return False
             raw_comment = case['comments'][0]['content']['raw']
-            gerrit_patch_id = re.findall(
+
-                r'https://gerrit(?:-test|)\.wikimedia\.org/r/(\d+)(?:$|\]\])', raw_comment)[0]
+            change_url = self.get_change_url(raw_comment)
-            merged = re.findall(
+            if change_url:
-                r'Change \d+ \*\*(?:merged|abandoned)\*\* by ',
+                op = self.get_operation_type(raw_comment, change_url)
-                raw_comment)
 
                 # Append True or False depending on whether the action was to
-            # open a patch (True) or merge a patch (False)
+                # open/reopen a change (True) or merge a change (False)
-            gerrit_patch_status[gerrit_patch_id].append(not(bool(merged)))
+                gerrit_patch_status[change_url].append(op in ["open", "reopen"])
 
         for patch in gerrit_patch_status:
             # The normal sequence of GerritBot transactions for a Gerrit change is "Change
@@ -67,11 +97,12 @@ class Checker():
             # by whoever" (indicated by False in gerrit_patch_status).  The transactions
             # are returned in reverse order so the opened/merged pattern will appear as
             # the reverse of [True, False], which is [False, True].
+            # FIXME: This logic can't handle a open/close/reopen/merge situation.
             if gerrit_patch_status[patch] != [False, True]:
                 return False
         return True
 
-
+if __name__ == "__main__":
     client = Client.newFromCreds()
 
     gerrit_bot_phid = 'PHID-USER-idceizaw6elwiwm5xshb'