[Findit] Show the list of failed build cycles that a culprit is responsible for.

appengine/findit/handlers/culprit.py

Index: appengine/findit/handlers/culprit.py
diff --git a/appengine/findit/handlers/culprit.py b/appengine/findit/handlers/culprit.py
new file mode 100644
index 0000000000000000000000000000000000000000..1575f0e24a46a586dfa3dd4d748d66dd56bc6aee
--- /dev/null
+++ b/appengine/findit/handlers/culprit.py
@@ -0,0 +1,43 @@
+# 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.
+
+from google.appengine.ext import ndb
+
+from common.base_handler import BaseHandler
+from common.base_handler import Permission
+
+
+def _FormatDatetime(dt):
+  if not dt:
+    return None  # pragma: no cover
+  else:
+    return dt.strftime('%Y-%m-%d %H:%M:%S UTC')
+
+
+class Culprit(BaseHandler):
+  PERMISSION_LEVEL = Permission.ANYONE
+
+  def HandleGet(self):
+    """Lists the build cycles in which the culprit caused failures."""
+    key = self.request.get('key', '')
+
+    culprit = ndb.Key(urlsafe=key).get()
+    if not culprit:  # pragma: no cover
+      return self.CreateError('Culprit not found', 404)
+
+    def ConvertBuildInfoToADict(build_info):
+      return {
+          'master_name': build_info[0],
+          'builder_name': build_info[1],
+          'build_number': build_info[2],
+      }
+
+    data = {
+        'project_name': culprit.project_name,
+        'revision': culprit.revision,
+        'cr_notified': culprit.cr_notified,
+        'cr_notification_time': _FormatDatetime(culprit.cr_notification_time),
+        'builds': map(ConvertBuildInfoToADict, culprit.builds),
+    }
+    return {'template': 'waterfall/culprit.html', 'data': data}