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Instructions

Prerequisites

  1. Install Docker

Set your SnowCLI connection (optional)

We use your default connection to connect to Snowflake and deploy the images / app. Set your default connection by modifying your config.toml file or by exporting the following environment variable:

export SNOWFLAKE_DEFAULT_CONNECTION_NAME=<your connection name>

Create image repository, build and push your local service image

The service/ directory contains a Dockerfile that builds a simple Python server that responds to GET health checks, a GET for /index.html, as well as POSTing to /echo in the Snowflake External Function payload format. You can build it and push it to an image repository called SPCS_NA.PUBLIC.IMAGES in your account like so:

./build-and-push.sh

This command will always use your default SnowCLI connection.

Deploy the application

Deploy the app package and instance as such:

snow app run

Take note of the name of the application, which is based on the name you chose when you initialized this project. The application object and package are, by default, automatically suffixed by your (local) user name (i.e. $USER).

Setup the application

When the application is opened for the first time, you will be prompted to grant the following account-level privileges to it:

  • CREATE COMPUTE POOL
  • BIND SERVICE ENDPOINT

Click on the Grant button to proceed.

Activate the application

Once privileges are granted, a new Activate button should appear. Click the button and wait until the application is fully activated. The Activate button invokes the grant_callback defined in the manifest.yml file, which then creates the COMPUTE POOL and SERVICE needed to launch the application.

Launch the application

Once all services and pools are created, you will be able to launch the app by clicking on the Launch App button. This will navigate to the URL provided by the Service and Endpoint defined in the default_web_endpoint in the manifest.yml. You will see the contents of index.html as served by the application container.

Test out the echo service

snow sql -q "select <app name>.services.echo('Hello world!')"

You should see the same text back (Hello world!).

Clean up

You can stop the service and drop the compute pool without dropping the application by running the following statement:

snow sql -q "call <app name>.setup.drop_service_and_pool()"

Optionally, you can remove the app + package altogether afterwards:

snow app teardown --cascade

Version 2.4.0+ of Snowflake CLI should be installed in order to execute --cascate command.