publish-events/channel-connection/client-libraries/python/publish.py

# Copyright 2023 Google LLC
#
# Licensed 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
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# [START eventarc_third_party_publish_python]
import sys
import argparse
import logging

from cloudevents.http import CloudEvent
from cloudevents.conversion import to_json
from google.cloud.eventarc_publishing_v1.types import publisher
from google.cloud.eventarc_publishing_v1.services.publisher import client

parser = argparse.ArgumentParser(
    description="Arguments to publish an event with Eventarc Publisher API")
parser.add_argument('--channel-connection', type=str,
                    help='Name of the channel connection on which the event should be published')
parser.add_argument(
    '--log', type=str, choices=['DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL'], default='ERROR')

logger = logging.getLogger()
console_handler = logging.StreamHandler(sys.stdout)
logger.addHandler(console_handler)


def main():
    args = parser.parse_args()
    logger.setLevel(args.log)

    # Build a valid CloudEvent
    # The CloudEvent "id" and "time" are auto-generated if omitted and "specversion" defaults to "1.0".
    attributes = {
        "type": "provider.v1.event",
        "source": "//provider/source",
        "datacontenttype": "application/json",
        # Note: someattribute and somevalue have to match with the client trigger!
        "someattribute": "somevalue"
    }
    data = {"message": "Hello World from Python"}
    event = CloudEvent(attributes, data)

    logger.debug('Prepared CloudEvent:')
    logger.debug(event)

    request = publisher.PublishChannelConnectionEventsRequest()
    request.channel_connection = args.channel_connection
    request.text_events.append(to_json(event))

    logger.debug('Prepared publishing request:')
    logger.debug(request)

    publisher_client = client.PublisherClient()
    response = publisher_client.publish_channel_connection_events(request)
    logger.info('Event published')
    logger.debug(f'Result: {response}')


if __name__ == '__main__':
    main()
# [END eventarc_third_party_publish_python]