[Predator] Run predator.

appengine/findit/util_scripts/crash_queries/delta_test/run-predator.py

Index: appengine/findit/util_scripts/crash_queries/delta_test/run-predator.py
diff --git a/appengine/findit/util_scripts/crash_queries/delta_test/run-predator.py b/appengine/findit/util_scripts/crash_queries/delta_test/run-predator.py
new file mode 100644
index 0000000000000000000000000000000000000000..564a84c63f07dc5e8531bff31bfe5cd32c003070
--- /dev/null
+++ b/appengine/findit/util_scripts/crash_queries/delta_test/run-predator.py
@@ -0,0 +1,127 @@
+# 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 argparse
+import json
+import logging
+import os
+import sys
+import threading
+import traceback
+
+_SCRIPT_DIR = os.path.join(os.path.dirname(__file__), os.path.pardir,
+                           os.path.pardir)
+sys.path.insert(1, _SCRIPT_DIR)
+
+import script_util
+script_util.SetUpSystemPaths()
+
+from common.chrome_dependency_fetcher import ChromeDependencyFetcher
+from crash.crash_pipeline import FinditForClientID
+from crash.crash_report import CrashReport
+from crash.culprit import Culprit
+from crash.detect_regression_range import DetectRegressionRange
+from crash.findit_for_chromecrash import FinditForChromeCrash
+from crash.type_enums import CrashClient
+from crash_queries.delta_test import delta_util
+from git_checkout.local_git_repository import LocalGitRepository
+from model.crash.crash_config import CrashConfig
+import remote_api
+
+_FRACAS_FEEDBACK_URL_TEMPLATE = (
+    'https://%s.appspot.com/crash/fracas-result-feedback?key=%s')
+
+
+
+def StoreResults(crash, client_id, app_id, id_to_culprits, lock, verbose=False):
+  """Stores findit result of crash into id_to_culprits dict."""
+  crash_url = _FRACAS_FEEDBACK_URL_TEMPLATE % (app_id, crash['id'])
+  try:
+    findit = FinditForClientID(client_id, LocalGitRepository())
+    stacktrace = findit._stacktrace_parser.Parse(
+        crash['stack_trace'],
+        ChromeDependencyFetcher(findit._repository).GetDependency(
+            crash['crashed_version'],
+            crash['platform']))
+    if stacktrace:
+      culprit = findit._predator.FindCulprit(CrashReport(
+          crashed_version=crash['crashed_version'],
+          signature=crash['signature'],
+          platform=crash['platform'],
+          stacktrace=stacktrace,
+          regression_range=crash['regression_range']))
+    else:
+      culprit = None
+    with lock:
+      id_to_culprits[crash['id']] = culprit
+      if verbose:
+        print '\n\nCrash:', crash_url
+        print json.dumps(culprit.ToDicts()[0] if culprit else {'found': False},
+                         indent=4, sort_keys=True)
+  except Exception:
+    with lock:
+      id_to_culprits[crash['id']] = None
+      print '\n\nCrash:', crash_url
+      print traceback.format_exc()
+
+
+def GetCulprits(crashes, client_id, app_id, verbose=False):
+  """Run predator analysis on crashes locally."""
+  # Enable remote access to app engine services.
+  remote_api.EnableRemoteApi(app_id)
+  origin_get = CrashConfig.Get
+  try:
+    # This hack is to solve flaky BadStatusLine excepion(crbug.com/666150) in
+    # remote api when key.get() gets called in threads.
+    # TODO(katesonia): Remove this hack after crbug.com/659354 is done.
+    CrashConfig.Get = script_util.GetLockedMethod(CrashConfig, 'Get',
+                                                  threading.Lock())
+    id_to_culprits = {}
+    tasks = []
+    lock = threading.Lock()
+    for crash in crashes:
+      crash['regression_range'] = DetectRegressionRange(
+          crash['historical_metadata'])
+      tasks.append({
+          'function': StoreResults,
+          'args': [crash, client_id, app_id, id_to_culprits, lock],
+          'kwargs': {'verbose': verbose}
+      })
+    script_util.RunTasks(tasks)
+
+    return id_to_culprits
+  finally:
+    CrashConfig.Get = origin_get
+
+
+def RunPredator():
+  """Runs delta testing between 2 different Findit versions."""
+  argparser = argparse.ArgumentParser(
+      description='Run Predator on a batch of crashes.')
+  argparser.add_argument('result_path', help='Path to store results')
+  argparser.add_argument('client', help=('Possible values are: fracas, cracas, '
+                                         'clusterfuzz. Right now, only fracas '
+                                         'is supported.'))
+  argparser.add_argument('app', help='App engine id to get config from.')
+  argparser.add_argument(
+      '--verbose',
+      '-v',
+      action='store_true',
+      default=False,
+      help='Print findit results.')
+  args = argparser.parse_args()
+
+  crashes = json.loads(raw_input())
+  if not crashes:
+    logging.error('Failed to get crashes info.')
+    return
+
+  culprits = GetCulprits(crashes, args.client, args.app, args.verbose)
+  delta_util.FlushResult(culprits, args.result_path)
+
+
+if __name__ == '__main__':
+  # Disable the trivial loggings inside predator.
+  logging.basicConfig(level=logging.ERROR)
+  RunPredator()