Sample command-line program for interacting with the Cloud Tasks API using App Engine queues.

App Engine queues push tasks to an App Engine HTTP target. This directory contains both the App Engine app to deploy, as well as the snippets to run locally to push tasks to it, which could also be called on App Engine.

create_app_engine_queue_task.py is a simple command-line program to create tasks to be pushed to the App Engine app.

main.py is the main App Engine app. This app serves as an endpoint to receive App Engine task attempts.

app.yaml configures the App Engine app.

Please refer to Setting Up a Python Development Environment.

To set up authentication, please refer to our authentication getting started guide.

To create a queue using the Cloud SDK, use the following gcloud command:

gcloud alpha tasks queues create-app-engine-queue my-appengine-queue

Note: A newly created queue will route to the default App Engine service and version unless configured to do otherwise.

Deploy the App Engine app with gcloud:

gcloud app deploy

Verify the index page is serving:

gcloud app browse

The App Engine app serves as a target for the push requests. It has an endpoint /log_payload that reads the payload (i.e., the request body) of the HTTP POST request and logs it. The log output can be viewed with:

gcloud app logs read

Set environment variables:

First, your project ID:

export PROJECT_ID=my-project-id

Then the queue ID, as specified at queue creation time. Queue IDs already created can be listed with gcloud alpha tasks queues list.

export QUEUE_ID=my-appengine-queue

And finally the location ID, which can be discovered with gcloud alpha tasks queues describe $QUEUE_ID, with the location embedded in the "name" value (for instance, if the name is "projects/my-project/locations/us-central1/queues/my-appengine-queue", then the location is "us-central1").

export LOCATION_ID=us-central1

Create a task, targeted at the log_payload endpoint, with a payload specified:

python create_app_engine_queue_task.py --project=$PROJECT_ID --queue=$QUEUE_ID --location=$LOCATION_ID --payload=hello

Now view that the payload was received and verify the payload:

gcloud app logs read

Create a task that will be scheduled for a time in the future using the --in_seconds flag:

python create_app_engine_queue_task.py --project=$PROJECT_ID --queue=$QUEUE_ID --location=$LOCATION_ID --payload=hello --in_seconds=30