sdks/python/apache_beam/yaml/main.py

#
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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
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#    http://www.apache.org/licenses/LICENSE-2.0
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import argparse

import yaml

import apache_beam as beam
from apache_beam.io.filesystems import FileSystems
from apache_beam.typehints.schemas import LogicalType
from apache_beam.typehints.schemas import MillisInstant
from apache_beam.yaml import yaml_transform

# Workaround for https://github.com/apache/beam/issues/28151.
LogicalType.register_logical_type(MillisInstant)


def _configure_parser(argv):
  parser = argparse.ArgumentParser()
  parser.add_argument(
      '--pipeline_spec', help='A yaml description of the pipeline to run.')
  parser.add_argument(
      '--pipeline_spec_file',
      help='A file containing a yaml description of the pipeline to run.')
  return parser.parse_known_args(argv)


def _pipeline_spec_from_args(known_args):
  if known_args.pipeline_spec_file and known_args.pipeline_spec:
    raise ValueError(
        "Exactly one of pipeline_spec or pipeline_spec_file must be set.")
  elif known_args.pipeline_spec_file:
    with FileSystems.open(known_args.pipeline_spec_file) as fin:
      pipeline_yaml = fin.read().decode()
  elif known_args.pipeline_spec:
    pipeline_yaml = known_args.pipeline_spec
  else:
    raise ValueError(
        "Exactly one of pipeline_spec or pipeline_spec_file must be set.")

  return pipeline_yaml


def run(argv=None):
  yaml_transform._LOGGER.setLevel('INFO')
  known_args, pipeline_args = _configure_parser(argv)
  pipeline_yaml = _pipeline_spec_from_args(known_args)
  pipeline_spec = yaml.load(pipeline_yaml, Loader=yaml_transform.SafeLineLoader)

  with beam.Pipeline(  # linebreak for better yapf formatting
      options=beam.options.pipeline_options.PipelineOptions(
          pipeline_args,
          pickle_library='cloudpickle',
          **yaml_transform.SafeLineLoader.strip_metadata(pipeline_spec.get(
              'options', {}))),
      display_data={'yaml': pipeline_yaml}) as p:
    print("Building pipeline...")
    yaml_transform.expand_pipeline(p, pipeline_spec)
    print("Running pipeline...")


if __name__ == '__main__':
  import logging
  logging.getLogger().setLevel(logging.INFO)
  run()