[Android] Redesigns the sharder to allow replicated vs distributed tests

build/android/pylib/gtest/setup.py

 # Copyright (c) 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.
 
-"""Dispatches GTests."""
+"""Generates test runner factory and tests for GTests."""
 
-import copy
 import fnmatch
 import glob
 import logging
 import os
 import shutil
 
 from pylib import android_commands
 from pylib import cmd_helper
 from pylib import constants
-from pylib import ports
 from pylib.base import base_test_result
-from pylib.base import shard
-from pylib.utils import emulator
-from pylib.utils import report_results
-from pylib.utils import xvfb
 
 import gtest_config
 import test_runner
 
 
 # TODO(frankf): Add more test targets here after making sure we don't
 # blow up the dependency size (and the world).
 _ISOLATE_FILE_PATHS = {
     'base_unittests': 'base/base_unittests.isolate',
     'unit_tests': 'chrome/unit_tests.isolate',
@@ skipping 99 matching lines @@
   deps_product_dir = os.path.join(deps_dir, 'out', build_type)
   if os.path.isdir(deps_product_dir):
     for p in os.listdir(deps_product_dir):
       shutil.move(os.path.join(deps_product_dir, p), deps_dir)
     os.rmdir(deps_product_dir)
     os.rmdir(os.path.join(deps_dir, 'out'))
 
   return deps_dir
 
 
-def _FullyQualifiedTestSuites(exe, option_test_suite, build_type):
+def _FullyQualifiedTestSuite(use_exe_test_runner, suite_name, build_type):
   """Get a list of absolute paths to test suite targets.
 
   Args:
-    exe: if True, use the executable-based test runner.
-    option_test_suite: the test_suite specified as an option.
+    use_exe_test_runner: if True, use the executable-based test runner.
+    suite_name: the suite name specified on the command line.
     build_type: 'Release' or 'Debug'.
 
   Returns:
-    A list of tuples containing the suite and absolute path.
+    A tuple containing the suite and absolute path.
     Ex. ('content_unittests',
           '/tmp/chrome/src/out/Debug/content_unittests_apk/'
           'content_unittests-debug.apk')
 
   Raises:
     Exception: If test suite not found.
   """
   def GetQualifiedSuite(suite):
     if suite.is_suite_exe:
       relpath = suite.name
     else:
       # out/(Debug|Release)/$SUITE_apk/$SUITE-debug.apk
       relpath = os.path.join(suite.name + '_apk', suite.name + '-debug.apk')
     return suite.name, os.path.join(test_suite_dir, relpath)
 
   test_suite_dir = os.path.join(cmd_helper.OutDirectory.get(), build_type)
-  if option_test_suite:
-    all_test_suites = [gtest_config.Suite(exe, option_test_suite)]
-  else:
-    all_test_suites = gtest_config.STABLE_TEST_SUITES
+  test_suite = gtest_config.Suite(use_exe_test_runner, suite_name)
+  name, path = GetQualifiedSuite(test_suite)
 
-  # List of tuples (suite_name, suite_path)
-  qualified_test_suites = map(GetQualifiedSuite, all_test_suites)
+  if not os.path.exists(path):
+    raise Exception('Test suite %s not found in %s.\n'
+                    'Supported test suites:\n %s\n'
+                    'Ensure it has been built.\n' %
+                    (name, path,
+                     [s.name for s in gtest_config.STABLE_TEST_SUITES]))
 
-  for t, q in qualified_test_suites:
-    if not os.path.exists(q):
-      raise Exception('Test suite %s not found in %s.\n'
-                      'Supported test suites:\n %s\n'
-                      'Ensure it has been built.\n' %
-                      (t, q, [s.name for s in gtest_config.STABLE_TEST_SUITES]))
-  return qualified_test_suites
+  return (name, path)
 
 
 def GetTestsFromDevice(runner):
   """Get a list of tests from a device, excluding disabled tests.
 
   Args:
     runner: a TestRunner.
   Returns:
     All non-disabled tests on the device.
   """
   # The executable/apk needs to be copied before we can call GetAllTests.
   runner.test_package.StripAndCopyExecutable()
   all_tests = runner.test_package.GetAllTests()
   # Only includes tests that do not have any match in the disabled list.
   disabled_list = runner.GetDisabledTests()
   return filter(lambda t: not any([fnmatch.fnmatch(t, disabled_pattern)
                                    for disabled_pattern in disabled_list]),
                 all_tests)
 
 
 def GetAllEnabledTests(runner_factory, devices):
   """Get all enabled tests.
 
   Obtains a list of enabled tests from the test package on the device,
   then filters it again using the disabled list on the host.
 
   Args:
-    runner_factory: callable that takes a devices and returns a TestRunner.
-    devices: list of devices.
+    runner_factory: callable that takes device and shard_index and returns
+        a TestRunner.
+    devices: a list of device ids.
 
   Returns:
     List of all enabled tests.
 
   Raises:
     Exception: If no devices available.
   """
   for device in devices:
     try:
       logging.info('Obtaining tests from %s', device)
       runner = runner_factory(device, 0)
       return GetTestsFromDevice(runner)
     except Exception as e:
       logging.warning('Failed obtaining tests from %s with exception: %s',
                       device, e)
   raise Exception('No device available to get the list of tests.')
 
 
-def _RunATestSuite(options, suite_name):
-  """Run a single test suite.
-
-  Helper for Dispatch() to allow stop/restart of the emulator across
-  test bundles.  If using the emulator, we start it on entry and stop
-  it on exit.
+def Setup(use_exe_test_runner, suite_name, test_arguments, timeout,
+          cleanup_test_files, tool, build_type, webkit, push_deps,
+          gtest_filter):
+  """Create the test runner factory and tests.
 
   Args:
-    options: options for running the tests.
-    suite_name: name of the test suite being run.
+    use_exe_test_runner: if True, use the executable-based test runner.
+    suite_name: the suite name specified on the command line.
+    test_arguments: Additional arguments to pass to the test binary.
+    timeout: Timeout for each test.
+    cleanup_test_files: Whether or not to cleanup test files on device.
+    tool: Name of the Valgrind tool.
+    build_type: 'Release' or 'Debug'.
+    webkit: Whether the suite is being run from a WebKit checkout.
+    push_deps: If True, push all dependencies to the device.
+    gtest_filter: filter for tests.
 
   Returns:
-    A tuple of (base_test_result.TestRunResult object, exit code).
+    A tuple of (TestRunnerFactory, tests).
+  """
+  suite_name, suite_path = _FullyQualifiedTestSuite(use_exe_test_runner,
+                                                    suite_name, build_type)
+  # TODO(gkanwar): This breaks the abstraction of having test_dispatcher.py deal
+  # entirely with the devices. Can we do this another way?
+  attached_devices = android_commands.GetAttachedDevices()
 
-  Raises:
-    Exception: For various reasons including device failure or failing to reset
-        the test server port.
-  """
-  attached_devices = []
-  buildbot_emulators = []
-
-  if options.use_emulator:
-    buildbot_emulators = emulator.LaunchEmulators(options.emulator_count,
-                                                  options.abi,
-                                                  wait_for_boot=True)
-    attached_devices = [e.device for e in buildbot_emulators]
-  elif options.test_device:
-    attached_devices = [options.test_device]
-  else:
-    attached_devices = android_commands.GetAttachedDevices()
-
-  if not attached_devices:
-    raise Exception('A device must be attached and online.')
-
-  # Reset the test port allocation. It's important to do it before starting
-  # to dispatch any tests.
-  if not ports.ResetTestServerPortAllocation():
-    raise Exception('Failed to reset test server port.')
-
-  deps_dir = _GenerateDepsDirUsingIsolate(suite_name, options.build_type)
-
+  deps_dir = _GenerateDepsDirUsingIsolate(suite_name, build_type)
   # Constructs a new TestRunner with the current options.
-  def RunnerFactory(device, shard_index):
+  def TestRunnerFactory(device, shard_index):
     return test_runner.TestRunner(
         device,
-        options.test_suite,
-        options.test_arguments,
-        options.timeout,
-        options.cleanup_test_files,
-        options.tool,
-        options.build_type,
-        options.webkit,
-        options.push_deps,
+        suite_path,
+        test_arguments,
+        timeout,
+        cleanup_test_files,
+        tool,
+        build_type,
+        webkit,
+        push_deps,
         constants.GTEST_TEST_PACKAGE_NAME,
         constants.GTEST_TEST_ACTIVITY_NAME,
         constants.GTEST_COMMAND_LINE_FILE,
         deps_dir=deps_dir)
 
   # Get tests and split them up based on the number of devices.
-  if options.test_filter:
-    all_tests = [t for t in options.test_filter.split(':') if t]
+  # TODO(gkanwar): Sharding shouldn't happen here.
+  if gtest_filter:
+    all_tests = [t for t in gtest_filter.split(':') if t]
   else:
-    all_tests = GetAllEnabledTests(RunnerFactory, attached_devices)
+    all_tests = GetAllEnabledTests(TestRunnerFactory, attached_devices)
   num_devices = len(attached_devices)
   tests = [':'.join(all_tests[i::num_devices]) for i in xrange(num_devices)]
   tests = [t for t in tests if t]
 
-  # Run tests.
-  test_results, exit_code = shard.ShardAndRunTests(
-      RunnerFactory, attached_devices, tests, options.build_type,
-      test_timeout=None, num_retries=options.num_retries)
-
-  report_results.LogFull(
-      results=test_results,
-      test_type='Unit test',
-      test_package=suite_name,
-      build_type=options.build_type,
-      flakiness_server=options.flakiness_dashboard_server)
-
-  for buildbot_emulator in buildbot_emulators:
-    buildbot_emulator.Shutdown()
-
-  return (test_results, exit_code)
-
-
-def _ListTestSuites():
-  """Display a list of available test suites."""
-  print 'Available test suites are:'
-  for test_suite in gtest_config.STABLE_TEST_SUITES:
-    print test_suite
-
-
-def Dispatch(options):
-  """Dispatches the tests, sharding if possible.
-
-  If options.use_emulator is True, all tests will be run in new emulator
-  instance.
-
-  Args:
-    options: options for running the tests.
-
-  Returns:
-    base_test_result.TestRunResults object with the results of running the tests
-  """
-  results = base_test_result.TestRunResults()
-
-  if options.test_suite == 'help':
-    _ListTestSuites()
-    return (results, 0)
-
-  if options.use_xvfb:
-    framebuffer = xvfb.Xvfb()
-    framebuffer.Start()
-
-  all_test_suites = _FullyQualifiedTestSuites(options.exe, options.test_suite,
-                                              options.build_type)
-  exit_code = 0
-  for suite_name, suite_path in all_test_suites:
-    # Give each test suite its own copy of options.
-    test_options = copy.deepcopy(options)
-    test_options.test_suite = suite_path
-    test_results, test_exit_code = _RunATestSuite(test_options, suite_name)
-    results.AddTestRunResults(test_results)
-    if test_exit_code and exit_code != constants.ERROR_EXIT_CODE:
-      exit_code = test_exit_code
-
-  if options.use_xvfb:
-    framebuffer.Stop()
-
-  return (results, exit_code)
+  return (TestRunnerFactory, tests)