web_flask_pubsub.py

def pubsub_callback(message):
    messages.append(message.data)
    message.ack()
    app.logger.info(message.data)
    
@app.before_request
def before_first_request():
    subscriber = pubsub_v1.SubscriberClient()
    subscription_path = subscriber.subscription_path(PROJECT_ID, subscription_name)
    #subscriber.subscribe_experimental(subscription_name, pubsub_callback)
    app.logger.info(subscription_path)
    app.logger.info(dir(app))
    subscriber.subscribe(subscription_path, pubsub_callback)