Ruby Google Cloud Tasks sample for Google App Engine Standard

This sample application shows how to use Google Cloud Tasks on Google App Engine [standard environment][appengine-standard].

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

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

app.yaml configures the app for App Engine Ruby flexible environment.

• Setup
• Running locally
• Deploying to App Engine
• Running the tests

Setup

Before you can run or deploy the sample, you need to do the following:

1. Refer to the appengine/README.md file for instructions on running and deploying.
2. Enable the Cloud Tasks API in the Google Cloud Console.
3. Set up Google Application Credentials.
4. Install dependencies:

   bundle install
   

Creating a queue

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

gcloud tasks queues create my-appengine-queue

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

Deploying the app to App Engine standard environment

Deploy the App Engine app with gcloud:

gcloud app deploy app.yaml

Verify the index page is serving:

gcloud app browse

Run the Sample Using the Command Line

Set environment variables:

First, your project ID:

export GOOGLE_CLOUD_PROJECT=my-project-id

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

export QUEUE_ID=my-appengine-queue

And finally the location ID, which can be discovered with gcloud 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

Using App Engine Push Queues

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

ruby create_task.rb $GOOGLE_CLOUD_PROJECT $LOCATION_ID $QUEUE_ID hello

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

Create a task that will be scheduled for a time in the future using the a second argument:

ruby create_task.rb $GOOGLE_CLOUD_PROJECT $LOCATION_ID $QUEUE_ID hello 30