[Findit] Flake Checker: Extract commit position and git hash and display to UI for each analyzed bu…

appengine/findit/waterfall/buildbot.py

 # Copyright 2014 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 contextlib
 from datetime import datetime
 import gzip
 import logging
 import json
 import re
@@ skipping 17 matching lines @@
     r'^%s/([^/]+)/builders/([^/]+)/builds/([\d]+)(?:/.*)?$' %
     _HOST_NAME_PATTERN)
 
 _MILO_BUILD_URL_PATTERN = re.compile(
     r'^https?://luci-milo\.appspot\.com/([^/]+)/([^/]+)/([^/]+)(?:/.*)?$')
 
 _STEP_URL_PATTERN = re.compile(
     r'^%s/([^/]+)/builders/([^/]+)/builds/([\d]+)/steps/([^/]+)(/.*)?$' %
     _HOST_NAME_PATTERN)
 
+_COMMIT_POSITION_PATTERN = re.compile(
+    r'refs/heads/master@{#(\d+)}$', re.IGNORECASE)
+
 # These values are buildbot constants used for Build and BuildStep.
 # This line was copied from buildbot/master/buildbot/status/results.py.
 SUCCESS, WARNINGS, FAILURE, SKIPPED, EXCEPTION, RETRY, CANCELLED = range(7)
 
 
 def GetRecentCompletedBuilds(master_name, builder_name, http_client):
   """Returns a sorted list of recent completed builds for the given builder.
 
   Sorted by completed time, newer builds at beginning of the returned list.
   """
@@ skipping 166 matching lines @@
   times = build_data_json.get('times')
   if not times or len(times) < 2 or not times[1]:
     return None
   return datetime.utcfromtimestamp(times[1])
 
 
 def GetBuildResult(build_data_json):
   return build_data_json.get('results')
 
 
+def _GetCommitPosition(commit_position_line):
+  if commit_position_line:
+    match = _COMMIT_POSITION_PATTERN.match(commit_position_line)
+    if match:
+      return int(match.group(1))
+  return None
+
+
 def ExtractBuildInfo(master_name, builder_name, build_number, build_data):
   """Extracts and returns build information as an instance of BuildInfo."""
   build_info = BuildInfo(master_name, builder_name, build_number)
 
   data_json = json.loads(build_data)
   chromium_revision = GetBuildProperty(
       data_json.get('properties', []), 'got_revision')
+  commit_position_line = GetBuildProperty(
+      data_json.get('properties', []), 'got_revision_cp')
 
   build_info.build_start_time = GetBuildStartTime(data_json)
   build_info.build_end_time = GetBuildEndTime(data_json)
   build_info.chromium_revision = chromium_revision
+  build_info.commit_position = _GetCommitPosition(commit_position_line)
   build_info.completed = data_json.get('currentStep') is None
   build_info.result = GetBuildResult(data_json)
 
   changes = data_json.get('sourceStamp', {}).get('changes', [])
   for change in changes:
     if change['revision'] not in build_info.blame_list:
       build_info.blame_list.append(change['revision'])
 
   # Step categories:
   # 1. A step is passed if it is in SUCCESS or WARNINGS status.
@@ skipping 20 matching lines @@
       # the annotating step like "steps" fail too. Such annotating steps have a
       # log with name "preamble".
       continue
 
     if step_result in (SUCCESS, WARNINGS):
       build_info.passed_steps.append(step_name)
     elif step_result == FAILURE:
       build_info.failed_steps.append(step_name)
 
   return build_info