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pull_queue_snippets.py
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pull_queue_snippets.py
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#!/usr/bin/env python
# Copyright 2017 Google Inc.
#
# 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.
"""Sample command-line program for interacting with the Cloud Tasks API.
See README.md for instructions on setting up your development environment
and running the scripts.
"""
import argparse
import base64
# [START cloud_tasks_create_task]
def create_task(project, queue, location):
"""Create a task for a given queue with an arbitrary payload."""
import googleapiclient.discovery
# Create a client.
client = googleapiclient.discovery.build('cloudtasks', 'v2beta2')
# Prepare the payload.
payload = 'a message for the recipient'
# The API expects base64 encoding of the payload, so encode the unicode
# `payload` object into a byte string and base64 encode it.
base64_encoded_payload = base64.b64encode(payload.encode())
# The request body object will be emitted in JSON, which requires
# unicode objects, so convert the byte string to unicode (still base64).
converted_payload = base64_encoded_payload.decode()
# Construct the request body.
task = {
'task': {
'pullMessage': {
'payload': converted_payload
}
}
}
# Construct the fully qualified queue name.
queue_name = 'projects/{}/locations/{}/queues/{}'.format(
project, location, queue)
# Use the client to build and send the task.
response = client.projects().locations().queues().tasks().create(
parent=queue_name, body=task).execute()
print('Created task {}'.format(response['name']))
return response
# [END cloud_tasks_create_task]
# [START cloud_tasks_pull_task]
def lease_task(project, queue, location):
"""Lease a single task from a given queue for 10 minutes."""
import googleapiclient.discovery
# Create a client.
client = googleapiclient.discovery.build('cloudtasks', 'v2beta2')
duration_seconds = '600s'
lease_options = {
'maxTasks': 1,
'leaseDuration': duration_seconds,
'responseView': 'FULL'
}
queue_name = 'projects/{}/locations/{}/queues/{}'.format(
project, location, queue)
response = client.projects().locations().queues().tasks().lease(
parent=queue_name, body=lease_options).execute()
print('Leased task {}'.format(response))
return response['tasks'][0]
# [END cloud_tasks_pull_task]
def acknowledge_task(task):
"""Acknowledge a given task."""
import googleapiclient.discovery
# Create a client.
client = googleapiclient.discovery.build('cloudtasks', 'v2beta2')
body = {'scheduleTime': task['scheduleTime']}
client.projects().locations().queues().tasks().acknowledge(
name=task['name'], body=body).execute()
print('Acknowledged task {}'.format(task['name']))
if __name__ == '__main__':
parser = argparse.ArgumentParser(
description=__doc__,
formatter_class=argparse.RawDescriptionHelpFormatter)
subparsers = parser.add_subparsers(dest='command')
create_task_parser = subparsers.add_parser(
'create-task',
help=create_task.__doc__)
create_task_parser.add_argument(
'--project',
help='Project ID.',
required=True,
)
create_task_parser.add_argument(
'--queue',
help='Queue ID (short name).',
required=True,
)
create_task_parser.add_argument(
'--location',
help='Location of the queue, e.g. \'us-central1\'.',
required=True,
)
lease_and_ack_parser = subparsers.add_parser(
'lease-and-ack-task',
help=create_task.__doc__)
lease_and_ack_parser.add_argument(
'--project',
help='Project ID.',
required=True,
)
lease_and_ack_parser.add_argument(
'--queue',
help='Queue ID (short name).',
required=True,
)
lease_and_ack_parser.add_argument(
'--location',
help='Location of the queue, e.g. \'us-central1\'.',
required=True,
)
args = parser.parse_args()
if args.command == 'create-task':
create_task(args.project, args.queue, args.location)
if args.command == 'lease-and-ack-task':
task = lease_task(args.project, args.queue, args.location)
acknowledge_task(task)