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# Copyright 2015 Google Inc. All Rights Reserved.
#
# 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 app]
import base64
import json
import logging
import os
from flask import current_app, Flask, render_template, request
from google.cloud import pubsub_v1
app = Flask(__name__)
# Configure the following environment variables via app.yaml
# This is used in the push request handler to veirfy that the request came from
# pubsub and originated from a trusted source.
app.config['PUBSUB_VERIFICATION_TOKEN'] = \
os.environ['PUBSUB_VERIFICATION_TOKEN']
app.config['PUBSUB_TOPIC'] = os.environ['PUBSUB_TOPIC']
app.config['PROJECT'] = os.environ['GOOGLE_CLOUD_PROJECT']
# Global list to storage messages received by this instance.
MESSAGES = []
# [START index]
@app.route('/', methods=['GET', 'POST'])
def index():
if request.method == 'GET':
return render_template('index.html', messages=MESSAGES)
data = request.form.get('payload', 'Example payload').encode('utf-8')
publisher = pubsub_v1.PublisherClient()
topic_path = publisher.topic_path(
current_app.config['PROJECT'],
current_app.config['PUBSUB_TOPIC'])
publisher.publish(topic_path, data=data)
return 'OK', 200
# [END index]
# [START push]
@app.route('/pubsub/push', methods=['POST'])
def pubsub_push():
if (request.args.get('token', '') !=
current_app.config['PUBSUB_VERIFICATION_TOKEN']):
return 'Invalid request', 400
envelope = json.loads(request.data.decode('utf-8'))
payload = base64.b64decode(envelope['message']['data'])
MESSAGES.append(payload)
# Returning any 2xx status indicates successful receipt of the message.
return 'OK', 200
# [END push]
@app.errorhandler(500)
def server_error(e):
logging.exception('An error occurred during a request.')
return """
An internal error occurred: <pre>{}</pre>
See logs for full stacktrace.
""".format(e), 500
if __name__ == '__main__':
# This is used when running locally. Gunicorn is used to run the
# application on Google App Engine. See entrypoint in app.yaml.
app.run(host='127.0.0.1', port=8080, debug=True)
# [END app]