Get started with Datakit

Tech Preview and uses: Kong Gateway decK

Deployment Platform:

Prerequisites

decK

decK is a CLI tool for managing Kong Gateway declaratively with state files. To complete this tutorial you will first need to install decK.

Kong Gateway license

This tutorial requires a Kong Gateway license. Export your license to an environment variable:

export KONG_LICENSE_DATA='LICENSE_CONTENTS_GO_HERE'

Start Kong Gateway with the WASM engine

Start the Kong Gateway container with the KONG_WASM variable:

curl -Ls https://get.konghq.com/quickstart | bash -s -- \
   -e KONG_LICENSE_DATA \
   -e KONG_WASM=on

Create a Service and a Route

To be able to validate the configuration, we need to create a Gateway Service and a Route:

echo '
_format_version: "3.0"
services:
  - name: example-service
    url: http://httpbin.konghq.com
routes:
  - name: example-route
    paths:
    - "/"
    strip_path: true
    service:
      name: example-service
' | deck gateway apply -

Enable Datakit

Test out Datakit by combining responses from two third-party API calls, then returning the result directly back to the client:

echo '
_format_version: "3.0"
plugins:
  - name: datakit
    service: example-service
    config:
      debug: true
      nodes:
      - name: CAT_FACT
        type: call
        url: https://catfact.ninja/fact
      - name: DOG_FACT
        type: call
        url: https://dogapi.dog/api/v1/facts
      - name: JOIN
        type: jq
        inputs:
        - cat: CAT_FACT.body
        - dog: DOG_FACT.body
        jq: |
          {
            "cat_fact": $cat.fact,
            "dog_fact": $dog.facts[0]
          }
      - name: EXIT
        type: exit
        inputs:
        - body: JOIN
        status: 200
' | deck gateway apply -

Validate

Access the Service using the /anything path:

curl -i -X GET "http://localhost:8000/anything"

You should get a 200 response with a random fact from each fact generator called in the config:

{
    "cat_fact": "The longest living cat on record according to the Guinness Book belongs to the late Creme Puff of Austin, Texas who lived to the ripe old age of 38 years and 3 days!",
    "dog_fact": "Greyhounds can reach a speed of up to 45 miles per hour."
}

Cleanup

Destroy the Kong Gateway container

curl -Ls https://get.konghq.com/quickstart | bash -s -- -d