[Findit] Add a sub-pipeline to detect first-known failure.

appengine/findit/model/build_analysis.py

Index: appengine/findit/model/build_analysis.py
diff --git a/appengine/findit/model/build_analysis.py b/appengine/findit/model/build_analysis.py
new file mode 100644
index 0000000000000000000000000000000000000000..851e0c64bd65816e3b8e5018dfee7277e7a0f667
--- /dev/null
+++ b/appengine/findit/model/build_analysis.py
@@ -0,0 +1,46 @@
+# Copyright (c) 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.
+
+from google.appengine.ext import ndb
+
+from model.base_model import BaseModel
+from model.build_analysis_status import BuildAnalysisStatus
+
+
+class BuildAnalysis(BaseModel):
+  """Represents an analysis of a build cycle of a builder in a waterfall."""
+
+  @staticmethod
+  def CreateKey(master_name, builder_name, build_number):  # pragma: no cover
+    return ndb.Key('Master', master_name, 'Builder', builder_name,
+                   'BuildAnalysis', build_number)
+
+  @staticmethod
+  def CreateBuildAnalysis(
+      master_name, builder_name, build_number):  # pragma: no cover
+    return BuildAnalysis(
+        key=BuildAnalysis.CreateKey(master_name, builder_name, build_number))
+
+  @staticmethod
+  def GetBuildAnalysis(
+      master_name, builder_name, build_number):  # pragma: no cover
+    return BuildAnalysis.CreateKey(
+        master_name, builder_name, build_number).get()
+
+  def Reset(self):  # pragma: no cover
+    """Reset to the state as if no analysis is run."""
+    self.pipeline_url = None
+    self.status = BuildAnalysisStatus.PENDING
+    self.start_time = None
+    self.updated_time = None
+
+  # Information of the analyzed build.
+  build_start_time = ndb.DateTimeProperty(indexed=True)
+
+  # Information of analysis processing.
+  pipeline_url = ndb.StringProperty(indexed=False)
+  status = ndb.IntegerProperty(
+      default=BuildAnalysisStatus.PENDING, indexed=False)
+  start_time = ndb.DateTimeProperty(indexed=False)
+  updated_time = ndb.DateTimeProperty(indexed=False)