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#   http://www.apache.org/licenses/LICENSE-2.0
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#
# Client tests for Query Event Hooks

from __future__ import absolute_import, division, print_function
import pytest

from tests.common.custom_cluster_test_suite import CustomClusterTestSuite


class TestHooks(CustomClusterTestSuite):
  """
  Tests for FE QueryEventHook invocations.
  """
  DUMMY_HOOK = "org.apache.impala.testutil.DummyQueryEventHook"

  @pytest.mark.execute_serially
  @CustomClusterTestSuite.with_args(
      impala_log_dir="{query_event_hooks_log}",
      impalad_args=("--query_event_hook_classes={0} -logbuflevel=-1 ".format(DUMMY_HOOK)
                    + "--minidump_path={query_event_hooks_minidump}"),
      catalogd_args="--minidump_path={query_event_hooks_minidump}",
      tmp_dir_placeholders=['query_event_hooks_log', 'query_event_hooks_minidump'],
      disable_log_buffering=True)
  def test_query_event_hooks_execute(self):
    """
    Tests that the post query execution hook actually executes by using a
    dummy hook implementation.
    """
    # Dummy hook should log something (See org.apache.impala.testutil.DummyQueryEventHook)
    self.assert_impalad_log_contains("INFO",
        "{0}.onImpalaStartup".format(self.DUMMY_HOOK), expected_count=-1)
    # Run a test query that triggers a lineage event.
    self.execute_query_expect_success(
        self.client, "select count(*) from functional.alltypes")
    # onQueryComplete() is invoked by the lineage logger.
    self.assert_impalad_log_contains("INFO",
        "{0}.onQueryComplete".format(self.DUMMY_HOOK), expected_count=-1)


class TestHooksStartupFail(CustomClusterTestSuite):
  """
  Tests for failed startup due to bad QueryEventHook startup or registration

  All test cases in this testsuite are expected to fail cluster startup and will
  swallow exceptions thrown during setup_method().
  """
  @classmethod
  def setup_class(cls):
    if cls.exploration_strategy() != 'exhaustive':
      pytest.skip('runs only in exhaustive')
    super(TestHooksStartupFail, cls).setup_class()

  FAILING_HOOK = "org.apache.impala.testutil.AlwaysErrorQueryEventHook"
  NONEXIST_HOOK = "captain.hook"

  @pytest.mark.execute_serially
  @CustomClusterTestSuite.with_args(
      expect_cores=True,
      cluster_size=1,
      impalad_timeout_s=5,
      impala_log_dir="{hook_startup_fail_log}",
      impalad_args=("--query_event_hook_classes={0} ".format(FAILING_HOOK)
                    + "--minidump_path={hook_startup_fail_minidump}"),
      catalogd_args="--minidump_path={hook_startup_fail_minidump}",
      tmp_dir_placeholders=['hook_startup_fail_log', 'hook_startup_fail_minidump'],
      disable_log_buffering=True)
  def test_hook_startup_fail(self):
    """
    Tests that exception during QueryEventHook.onImpalaStart will prevent
    successful daemon startup.
    """
    # Parse log file for expected exception.
    self.assert_impalad_log_contains("INFO",
                                     "Exception during onImpalaStartup from "
                                     "QueryEventHook class {0}"
                                     .format(self.FAILING_HOOK), expected_count=-1)

  @pytest.mark.execute_serially
  @CustomClusterTestSuite.with_args(
      expect_cores=True,
      cluster_size=1,
      impalad_timeout_s=5,
      impala_log_dir="{hook_instantiation_fail_log}",
      impalad_args=("--query_event_hook_classes={0} ".format(NONEXIST_HOOK)
                    + "--minidump_path={hook_instantiation_fail_minidump}"),
      catalogd_args="--minidump_path={hook_instantiation_fail_minidump}",
      tmp_dir_placeholders=['hook_instantiation_fail_log',
                            'hook_instantiation_fail_minidump'],
      disable_log_buffering=True)
  def test_hook_instantiation_fail(self):
    """
    Tests that failure to instantiate a QueryEventHook will prevent
    successful daemon startup.
    """
    # Parse log file for expected exception.
    self.assert_impalad_log_contains("INFO",
                                     "Unable to instantiate query event hook class {0}"
                                     .format(self.NONEXIST_HOOK), expected_count=-1)