[Findit] Post analysis results of flakes to bug filed by chromium-try-flakes.

appengine/findit/waterfall/post_comment_to_bug_pipeline.py

Index: appengine/findit/waterfall/post_comment_to_bug_pipeline.py
diff --git a/appengine/findit/waterfall/post_comment_to_bug_pipeline.py b/appengine/findit/waterfall/post_comment_to_bug_pipeline.py
new file mode 100644
index 0000000000000000000000000000000000000000..3ae5af1cb58eb036eb9dadad19ff5f7fea3250a8
--- /dev/null
+++ b/appengine/findit/waterfall/post_comment_to_bug_pipeline.py
@@ -0,0 +1,47 @@
+# Copyright 2016 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import logging
+
+from issue_tracker import IssueTrackerAPI
+
+from common.pipeline_wrapper import BasePipeline
+
+
+def _GetIssue(bug_id, issue_tracker):
+  """Returns the issue of the given bug.
+
+  Traverse if the bug was merged into another."""
+  issue = issue_tracker.getIssue(bug_id)
+  while issue and issue.merged_into:
+    issue = issue_tracker.getIssue(issue.merged_into)
+  return issue
+
+
+class PostCommentToBugPipeline(BasePipeline):
+
+  # Arguments number differs from overridden method - pylint: disable=W0221
+  def run(self, bug_id, comment, labels, project_name='chromium'):
+    """Posts a comment and adds labels to the bug.
+
+    Args:
+      bug_id (int): The bug id to update.
+      comment (str): The comment to post.
+      labels (list): A list labels to add.
+      project_name (str): The project name for the bug. Default to 'chromium'.
+    """
+    assert bug_id, 'Invalid bug id: %s' % bug_id
+
+    issue_tracker = IssueTrackerAPI(project_name)
+    issue = _GetIssue(bug_id, issue_tracker)
+    if not issue:
+      logging.warn('Bug %s/%s or the merged-into one seems deleted!',
+                   project_name, bug_id)
+      return
+
+    for label in labels:
+      issue.labels.append(label)
+
+    issue_tracker.update(issue, comment, send_email=True)
+    logging.info('Bug %s/%s was updated.', project_name, bug_id)