addprefix.py

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"""A Python multi-language pipeline that adds prefixes to a given set of strings.

This pipeline reads an input text file and adds two prefixes to every line read from the file.
* Prefix 'java'. This is added by a multi-language Java transform named 'JavaPrefix'.
* Prefix 'python'. This is added by a Python transform.

Example commands for executing the program:

DirectRunner:
$ python addprefix.py --runner DirectRunner --environment_type=DOCKER --input <INPUT FILE> --output output --expansion_service_port <PORT>

DataflowRunner:
$ python addprefix.py \
 --runner DataflowRunner \
 --temp_location $TEMP_LOCATION \
 --project $GCP_PROJECT \
 --region $GCP_REGION \
 --job_name $JOB_NAME \
 --num_workers $NUM_WORKERS \
 --input "gs://dataflow-samples/shakespeare/kinglear.txt" \
 --output "gs://$GCS_BUCKET/javaprefix/output" \
 --expansion_service_port <PORT>
"""
importlogging
importre
importtyping

importapache_beamasbeam
fromapache_beam.ioimportReadFromText
fromapache_beam.ioimportWriteToText
fromapache_beam.transforms.externalimportImplicitSchemaPayloadBuilder
fromapache_beam.options.pipeline_optionsimportPipelineOptions


defrun(input_path, output_path, expansion_service_port, pipeline_args):
pipeline_options=PipelineOptions(pipeline_args)

withbeam.Pipeline(options=pipeline_options) asp:
input=p|'Read'>>ReadFromText(input_path).with_output_types(str)

java_output= (
input
|'JavaPrefix'>>beam.ExternalTransform(
'beam:transform:org.apache.beam:javaprefix:v1',
ImplicitSchemaPayloadBuilder({'prefix': 'java:'}),
 ('localhost:%s'%expansion_service_port)))

defpython_prefix(record):
return'python:%s'%record

output=java_output|'PythonPrefix'>>beam.Map(python_prefix)
output|'Write'>>WriteToText(output_path)


if__name__=='__main__':
logging.getLogger().setLevel(logging.INFO)
importargparse

parser=argparse.ArgumentParser()
parser.add_argument(
'--input',
dest='input',
required=True,
help='Input file')
parser.add_argument(
'--output',
dest='output',
required=True,
help='Output file')
parser.add_argument(
'--expansion_service_port',
dest='expansion_service_port',
required=True,
help='Expansion service port')
known_args, pipeline_args=parser.parse_known_args()

run(
known_args.input,
known_args.output,
known_args.expansion_service_port,
pipeline_args)