Android: first step into making "perf tests" reuse the functional test infra.

build/android/pylib/perf/test_runner.py

+# Copyright 2013 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.
+
+"""Runs a perf test on a single device.
+
+Our buildbot infrastructure requires each slave to run steps serially.
+This is sub-optimal for android, where these steps can run independently on
+multiple connected devices.
+
+The buildbots will run this script multiple times per cycle:
+- First: all steps listed in --steps in will be executed in parallel using all
+connected devices. Step results will be pickled to disk. Each step has a unique
+name. The result code will be ignored if the step name is listed in
+--flaky-steps.
+The buildbot will treat this step as a regular step, and will not process any
+graph data.
+
+- Then, with -print-step STEP_NAME: at this stage, we'll simply print the file
+with the step results previously saved. The buildbot will then process the graph
+data accordingly.
+
+The JSON steps file contains a dictionary in the format:
+{
+  "step_name_foo": "script_to_execute foo",
+  "step_name_bar": "script_to_execute bar"
+}
+
+The JSON flaky steps file contains a list with step names which results should
+be ignored:
+[
+  "step_name_foo",
+  "step_name_bar"
+]
+
+Note that script_to_execute necessarily have to take at least the following
+options:
+  --device: the serial number to be passed to all adb commands.
+  --keep_test_server_ports: indicates it's being run as a shard, and shouldn't
+  reset test server port allocation.
+"""
+
+import datetime
+import logging
+import pexpect
+import pickle
+import os
+import sys
+import time
+
+from pylib import constants
+from pylib.base import base_test_result
+from pylib.base import base_test_runner
+
+
+_OUTPUT_DIR = os.path.join(constants.DIR_SOURCE_ROOT, 'out', 'step_results')
+
+
+def PrintTestOutput(test_name):
+  """Helper method to print the output of previously executed test_name.
+
+  Args:
+    test_name: name of the test that has been previously executed.
+
+  Returns:
+    exit code generated by the test step.
+  """
+  file_name = os.path.join(_OUTPUT_DIR, test_name)
+  if not os.path.exists(file_name):
+    logging.error('File not found %s', file_name)
+    return 1
+
+  with file(file_name, 'r') as f:
+    persisted_result = pickle.loads(f.read())
+  print persisted_result['output']
+
+  return persisted_result['exit_code']
+
+
+class TestRunner(base_test_runner.BaseTestRunner):
+  def __init__(self, test_options, device, tests, flaky_tests):
+    """A TestRunner instance runs a perf test on a single device.
+
+    Args:
+      test_options: A PerfOptions object.
+      device: Device to run the tests.
+      tests: a dict mapping test_name to command.
+      flaky_tests: a list of flaky test_name.
+    """
+    super(TestRunner, self).__init__(device, None, 'Release')
+    self._options = test_options
+    self._tests = tests
+    self._flaky_tests = flaky_tests
+
+  @staticmethod
+  def _SaveResult(result):
+    with file(os.path.join(_OUTPUT_DIR, result['name']), 'w') as f:
+      f.write(pickle.dumps(result))
+
+  def _LaunchPerfTest(self, test_name):
+    """Runs a perf test.
+
+    Args:
+      test_name: the name of the test to be executed.
+
+    Returns:
+      A tuple containing (Output, base_test_result.ResultType)
+    """
+    cmd = ('%s --device %s --keep_test_server_ports' %
+           (self._tests[test_name], self.device))
+    start_time = datetime.datetime.now()
+    output, exit_code = pexpect.run(
+        cmd, cwd=os.path.abspath(constants.DIR_SOURCE_ROOT),
+        withexitstatus=True, logfile=sys.stdout, timeout=1800,
+        env=os.environ)
+    end_time = datetime.datetime.now()
+    logging.info('%s : exit_code=%d in %d secs at %s',
+                 test_name, exit_code, (end_time - start_time).seconds,
+                 self.device)
+    result_type = base_test_result.ResultType.FAIL
+    if exit_code == 0:
+      result_type = base_test_result.ResultType.PASS
+    if test_name in self._flaky_tests:
+      exit_code = 0
+      result_type = base_test_result.ResultType.PASS
+
+    persisted_result = {
+        'name': test_name,
+        'output': output,
+        'exit_code': exit_code,
+        'result_type': result_type,
+        'total_time': (end_time - start_time).seconds,
+        'device': self.device,
+    }
+    self._SaveResult(persisted_result)
+
+    return (output, result_type)
+
+  def RunTest(self, test_name):
+    """Run a perf test on the device.
+
+    Args:
+      test_name: String to use for logging the test result.
+
+    Returns:
+      A tuple of (TestRunResults, retry).
+    """
+    output, result_type = self._LaunchPerfTest(test_name)
+    results = base_test_result.TestRunResults()
+    results.AddResult(base_test_result.BaseTestResult(test_name, result_type))
+    retry = None
+    if not results.DidRunPass():
+      retry = test_name
+    return results, retry