#
# Licensed to the Apache Software Foundation (ASF) under one or more
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# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
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"""Wrapper of Beam runners that's built for running and verifying e2e tests."""

from __future__ import absolute_import
from __future__ import print_function

from apache_beam.internal import pickler
from apache_beam.options.pipeline_options import StandardOptions
from apache_beam.options.pipeline_options import TestOptions
from apache_beam.runners.direct.direct_runner import DirectRunner
from apache_beam.runners.runner import PipelineState

__all__ = ['TestDirectRunner']


class TestDirectRunner(DirectRunner):
  def run_pipeline(self, pipeline):
    """Execute test pipeline and verify test matcher"""
    options = pipeline._options.view_as(TestOptions)
    on_success_matcher = options.on_success_matcher
    is_streaming = options.view_as(StandardOptions).streaming

    # [BEAM-1889] Do not send this to remote workers also, there is no need to
    # send this option to remote executors.
    options.on_success_matcher = None

    self.result = super(TestDirectRunner, self).run_pipeline(pipeline)

    try:
      if not is_streaming:
        self.result.wait_until_finish()

      if on_success_matcher:
        from hamcrest import assert_that as hc_assert_that
        hc_assert_that(self.result, pickler.loads(on_success_matcher))
    finally:
      if not PipelineState.is_terminal(self.result.state):
        self.result.cancel()
        self.result.wait_until_finish()

    return self.result