cbuildbot/tree_status_unittest.py

#!/usr/bin/python
# Copyright 2014 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Test suite for tree_status.py"""

import os
import sys
import urllib

sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.dirname(
    os.path.abspath(__file__)))))

from chromite.cbuildbot import constants
from chromite.cbuildbot import tree_status
from chromite.lib import cros_test_lib
from chromite.lib import timeout_util


# pylint: disable=W0212,R0904

class TestTreeStatus(cros_test_lib.MoxTestCase):
  """Tests TreeStatus method in cros_build_lib."""

  status_url = 'https://chromiumos-status.appspot.com/current?format=json'

  def setUp(self):
    pass

  def _TreeStatusFile(self, message, general_state):
    """Returns a file-like object with the status message writtin in it."""
    my_response = self.mox.CreateMockAnything()
    my_response.json = '{"message": "%s", "general_state": "%s"}' % (
        message, general_state)
    return my_response

  def _SetupMockTreeStatusResponses(self, status_url,
                                    final_tree_status='Tree is open.',
                                    final_general_state=constants.TREE_OPEN,
                                    rejected_tree_status='Tree is closed.',
                                    rejected_general_state=
                                    constants.TREE_CLOSED,
                                    rejected_status_count=0,
                                    retries_500=0,
                                    output_final_status=True):
    """Mocks out urllib.urlopen commands to simulate a given tree status.

    Args:
      status_url: The status url that status will be fetched from.
      final_tree_status: The final value of tree status that will be returned
        by urlopen.
      final_general_state: The final value of 'general_state' that will be
        returned by urlopen.
      rejected_tree_status: An intermediate value of tree status that will be
        returned by urlopen and retried upon.
      rejected_general_state: An intermediate value of 'general_state' that
        will be returned by urlopen and retried upon.
      rejected_status_count: The number of times urlopen will return the
        rejected state.
      retries_500: The number of times urlopen will fail with a 500 code.
      output_final_status: If True, the status given by final_tree_status and
        final_general_state will be the last status returned by urlopen. If
        False, final_tree_status will never be returned, and instead an
        unlimited number of times rejected_response will be returned.
    """

    final_response = self._TreeStatusFile(final_tree_status,
                                          final_general_state)
    rejected_response = self._TreeStatusFile(rejected_tree_status,
                                            rejected_general_state)
    error_500_response = self.mox.CreateMockAnything()
    self.mox.StubOutWithMock(urllib, 'urlopen')

    for _ in range(retries_500):
      urllib.urlopen(status_url).AndReturn(error_500_response)
      error_500_response.getcode().AndReturn(500)

    if output_final_status:
      for _ in range(rejected_status_count):
        urllib.urlopen(status_url).AndReturn(rejected_response)
        rejected_response.getcode().AndReturn(200)
        rejected_response.read().AndReturn(rejected_response.json)

      urllib.urlopen(status_url).AndReturn(final_response)
      final_response.getcode().AndReturn(200)
      final_response.read().AndReturn(final_response.json)
    else:
      urllib.urlopen(status_url).MultipleTimes().AndReturn(rejected_response)
      rejected_response.getcode().MultipleTimes().AndReturn(200)
      rejected_response.read().MultipleTimes().AndReturn(
          rejected_response.json)

    self.mox.ReplayAll()

  def testTreeIsOpen(self):
    """Tests that we return True is the tree is open."""
    self._SetupMockTreeStatusResponses(self.status_url,
                                       rejected_status_count=5,
                                       retries_500=5)
    self.assertTrue(tree_status.IsTreeOpen(status_url=self.status_url,
                                           period=0))

  def testTreeIsClosed(self):
    """Tests that we return false is the tree is closed."""
    self._SetupMockTreeStatusResponses(self.status_url,
                                       output_final_status=False)
    self.assertFalse(tree_status.IsTreeOpen(status_url=self.status_url,
                                            period=0.1))

  def testTreeIsThrottled(self):
    """Tests that we return True if the tree is throttled."""
    self._SetupMockTreeStatusResponses(self.status_url,
        'Tree is throttled (flaky bug on flaky builder)',
        constants.TREE_THROTTLED)
    self.assertTrue(tree_status.IsTreeOpen(status_url=self.status_url,
                    throttled_ok=True))

  def testTreeIsThrottledNotOk(self):
    """Tests that we respect throttled_ok"""
    self._SetupMockTreeStatusResponses(self.status_url,
      rejected_tree_status='Tree is throttled (flaky bug on flaky builder)',
      rejected_general_state=constants.TREE_THROTTLED,
      output_final_status=False)
    self.assertFalse(tree_status.IsTreeOpen(status_url=self.status_url,
                                            period=0.1))

  def testWaitForStatusOpen(self):
    """Tests that we can wait for a tree open response."""
    self._SetupMockTreeStatusResponses(self.status_url)
    self.assertEqual(tree_status.WaitForTreeStatus(status_url=self.status_url),
                     constants.TREE_OPEN)


  def testWaitForStatusThrottled(self):
    """Tests that we can wait for a tree open response."""
    self._SetupMockTreeStatusResponses(self.status_url,
        final_general_state=constants.TREE_THROTTLED)
    self.assertEqual(tree_status.WaitForTreeStatus(status_url=self.status_url,
                                                   throttled_ok=True),
                     constants.TREE_THROTTLED)

  def testWaitForStatusFailure(self):
    """Tests that we can wait for a tree open response."""
    self._SetupMockTreeStatusResponses(self.status_url,
                                       output_final_status=False)
    self.assertRaises(timeout_util.TimeoutError,
                      tree_status.WaitForTreeStatus,
                      status_url=self.status_url,
                      period=0.1)


if __name__ == '__main__':
  cros_test_lib.main()