[Findit] Integrate with Fracas through Pub/Sub.

appengine/findit/model/crash/fracas_crash_analysis.py

+# 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 hashlib
+
+from google.appengine.ext import ndb
+
+from model.crash.crash_analysis import CrashAnalysis
+
+
+class FracasCrashAnalysis(CrashAnalysis):
+  """Represents an analysis of a Chrome crash."""
+  # Data of crash per million page loads for each Chrome version.
+  versions_to_cpm = ndb.JsonProperty(indexed=False)
+
+  def Reset(self):
+    super(FracasCrashAnalysis, self).Reset()
+    self.versions_to_cpm = None
+
+  @ndb.ComputedProperty
+  def channel(self):
+    return self.key.pairs()[0][1].split('/')[0]
+
+  @ndb.ComputedProperty
+  def platform(self):
+    return self.key.pairs()[0][1].split('/')[1]
+
+  @staticmethod
+  def _CreateKey(channel, platform, signature):
+    # Use sha1 hex digest of signature to avoid char conflict with '/'.
+    return ndb.Key('FracasCrashAnalysis', '%s/%s/%s' % (
+        channel, platform, hashlib.sha1(signature).hexdigest()))
+
+  @classmethod
+  def Get(cls, channel, platform, signature):
+    return cls._CreateKey(channel, platform, signature).get()
+
+  @classmethod
+  def Create(cls, channel, platform, signature):
+    analysis = cls(key=cls._CreateKey(channel, platform, signature))
+    analysis.signature = signature
+    return analysis