[Findit] Retrieve recent builds of a given builder.

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
 import urllib
 
 import cloudstorage as gcs
 
 from waterfall.build_info import BuildInfo
 
 
 _MASTER_URL_PATTERN = re.compile(r'^https?://build\.chromium\.org/p/([^/]+)'
                                  '(/.*)?$')
 
 _BUILD_URL_PATTERN = re.compile(r'^https?://build\.chromium\.org/p/([^/]+)/'
                                 'builders/([^/]+)/builds/([\d]+)(/.*)?$')
 
 _STEP_URL_PATTERN = re.compile(r'^https?://build\.chromium\.org/p/([^/]+)/'
                                'builders/([^/]+)/builds/([\d]+)/steps/'
                                '([^/]+)(/.*)?$')
 
 # 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.
+  """
+  url = 'https://build.chromium.org/p/%s/json/builders/' % master_name
+  status_code, data = http_client.Get(url)
+  if status_code != 200:
+    logging.error('Failed to retrieve recent builds for %s/%s',
+                  master_name, builder_name)
+    return []
+  data_json = json.loads(data)
+  metadata = data_json.get(builder_name, {})
+  cachedBuilds = metadata.get('cachedBuilds', [])
+  currentBuilds = metadata.get('currentBuilds', [])
+  return sorted(set(cachedBuilds) - set(currentBuilds), reverse=True)
+
+
 def GetMasterNameFromUrl(url):
   """Parses the given url and returns the master name."""
   if not url:
     return None
 
   match = _MASTER_URL_PATTERN.match(url)
   if not match:
     return None
   return match.group(1)
 
@@ skipping 194 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