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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>
"""
import logging
import re
import typing

import apache_beam as beam
from apache_beam.io import ReadFromText
from apache_beam.io import WriteToText
from apache_beam.transforms.external import ImplicitSchemaPayloadBuilder
from apache_beam.options.pipeline_options import PipelineOptions


def run(input_path, output_path, expansion_service_port, pipeline_args):
 pipeline_options = PipelineOptions(pipeline_args)

 with beam.Pipeline(options=pipeline_options) as p:
 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)))

 def python_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)
 import argparse

 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)