[Findit] Adding metadata for manually vs automatically triggered flake analyses

appengine/findit/waterfall/flake/triggering_sources.py

Index: appengine/findit/waterfall/flake/triggering_sources.py
diff --git a/appengine/findit/waterfall/flake/triggering_sources.py b/appengine/findit/waterfall/flake/triggering_sources.py
new file mode 100644
index 0000000000000000000000000000000000000000..5db2921414b8d36073f788a68b1dd49b05dc7b6b
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+++ b/appengine/findit/waterfall/flake/triggering_sources.py
@@ -0,0 +1,33 @@
+# 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.
+
+"""Sources for from where a flake analysis was triggered."""
+
+# An analysis was triggered directly through Findit's UI.
+FINDIT_UI = 1
+
+# An analysis was triggered using Findit's API.
+FINDIT_API = 2
+
+# An analysis was triggered using Findit's normal analysis pipeline.
+FINDIT_PIPELINE = 3
+
+
+def GetDescriptionForTriggeringSource(triggering_source, manually_triggered):
+  """Returns a human-readable description for where a request came from."""
+  template = 'The analysis was triggered %s through %s'
+
+  def _GetTriggeringSourceDescription(triggering_source):
+    source_to_description = {
+        FINDIT_UI: 'Findit UI',
+        FINDIT_API: 'Findit API',
+        FINDIT_PIPELINE: 'Findit pipeline'
+    }
+    return source_to_description.get(triggering_source, 'other/unknown source')
+
+  def _GetTriggeringUserDescription(manually_triggered):
+    return 'manually' if manually_triggered else 'automatically'
+
+  return template % (_GetTriggeringUserDescription(manually_triggered),
+                     _GetTriggeringSourceDescription(triggering_source))