Dictionary Application

A simple demo that simulates https://httpbin.org/get call and returns a JSON response.

The container image will be pushed to Google Artifact Registry docker repository. Deploy the pushed container image to Google Cloud Run.

Pre-Requisites

• Google Cloud Account
• A Google Service Account with permissions to create Google Artifact Registry registries, service accounts and service account keys.
• Drone CLI to test the pipeline locally
• jq to read and trim service account key json

Clone the sources

git clone https://github.com/kameshsampath/httpbin-get && cd "$_"
export TUTORIAL_HOME="$PWD"

Deploy Infrastructure

The repository has terraform scripts that allows you to quickly setup a Google Cloud infrastructure.

The terraform apply will,

• Create a Google Artifact Registry repository called harness-tutorial
• Create a Google Service Account called harness-tutorial-sa with permissions to
  • Administer the harness-tutorial repository
  • Deploy services to Google Cloud Run

The terraform.tfvars has all defaults. Edit and update it to suit your Google Cloud settings.

Deploy the infrastructure,

make init apply

On the successful run of the terraform, the service account key file will be generated in the $TUTORIAL_HOME/.keys/harness-tutorial-sa folder.

Build

Set some environment variables to be used with the drone pipeline,

NOTE: When using Harness CI, these environment variables could be added into respective step's envVariables

echo -n "" > .env
{
echo "REGISTRIES=$(terraform output -raw artifact_registry)"
echo "PLUGIN_IMAGE=$(terraform output -raw repo_url)/httpbin-get"
echo "PLUGIN_SERVICE_NAME=httpbin-get"
echo "PLUGIN_REGION=$(terraform output -raw region)"
echo "PLUGIN_PROJECT=$(terraform output -raw project_id)"
echo "PLUGIN_SERVICE_ACCOUNT_JSON='$(terraform output -raw repo_sa_key)'"
} >> .env

TIP: Run $PWD/scripts/set-env.sh to create the .env

Let us run the drone pipeline locally to test the infra is setup correctly

drone exec --env-file=.env --trusted

Invoke the service

drone exec --env-file=.env --pipeline='invoke'

The command should shown an output like

{
  "args": {}, 
  "headers": {
    "Accept-Encoding": "gzip, deflate, br", 
    "Accept-Language": "en-GB,en-US;q=0.9,en;q=0.8", 
    "Host": "httpbin.org", 
    "Referer": "https://httpbin.org/", 
    "User-Agent": "go-resty/2.7.0 (https://github.com/go-resty/resty)", 
    "X-Amzn-Trace-Id": "Root=1-63bd82a6-48984f670886c5f55890feea", 
    "X-My-Header": "harness-tutorial-demo"
  }, 
  "origin": "<some ip>", 
  "url": "https://httpbin.org/get"
}

Cleanup

The following command will destroy all resources that has have been created on Google Cloud.

Destroy the google cloud run service,

drone exec --env-file=.env --pipeline=cleanup

Delete all Google Cloud infrastructure resources,

make destroy