k8s_tunnel.yml

name: Tunnel to Juju controller via load balancer on k8s

on:
  pull_request:
    paths-ignore:
      - "README.md"
      - "project-docs/**"
  push:
    branches:
      - "main"
    paths-ignore:
      - "README.md"
      - "project-docs/**"

# Testing only needs permissions to read the repository contents.
permissions:
  contents: read

jobs:
  # Ensure project builds before running testing matrix
  build:
    name: Build
    runs-on: ubuntu-latest
    timeout-minutes: 5
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-go@v5
        with:
          go-version-file: "go.mod"
          cache: true
      - run: go build -v .

  # Run acceptance tests in a matrix with Terraform CLI versions
  add-machine-test:
    name: Add Machine
    needs: build
    runs-on: [self-hosted, jammy, x64]
    env:
      ACTIONS_ALLOW_IPV6: false
    strategy:
      fail-fast: false
      matrix:
        # Only on lxd
        cloud:
          - "microk8s"
        terraform:
          - "1.9.*"
    timeout-minutes: 60
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-go@v5
        with:
          go-version-file: "go.mod"
          cache: true
      # set up terraform
      - uses: hashicorp/setup-terraform@v3
        with:
          terraform_version: ${{ matrix.terraform }}
          terraform_wrapper: false
      # set up snap, lxd, tox, Juju, bootstrap a controller, etc.
      - name: Setup operator environment
        uses: charmed-kubernetes/actions-operator@main
        with:
          provider: ${{ matrix.cloud }}
          juju-channel: 2.9/stable
      - run: go mod download
      - name: "Bring up loadbalancer & access via terraform plan"
        run: |
          echo "Determine Juju details"
          CONTROLLER=$(juju whoami --format yaml | yq .controller)
          JUJU_AGENT_VERSION=$(juju show-controller | yq .$CONTROLLER.details.agent-version |tr -d '"')
          JUJU_USERNAME=$(juju show-controller | yq .$CONTROLLER.account.user)
          JUJU_PASSWORD=$(cat ~/.local/share/juju/accounts.yaml | yq .controllers.$CONTROLLER.password)
          JUJU_CA_CERT=$(juju show-controller | yq .$CONTROLLER.details.ca-cert | sed ':a;N;$!ba;s/\n/\\n/g')

          # Ensure Juju controller name
          echo "Controller name: $CONTROLLER"
          echo "Juju Username: $JUJU_USERNAME"

          # Enable Ingress in MicroK8s
          sudo microk8s enable ingress

          # Determine a subnet for MetalLB
          subnet="$(ip route get 1 | head -n 1 | awk '{print $7}' | awk -F. '{print $1 "." $2 "." $3 ".240/24"}')"
          echo "MetalLB subnet: $subnet"
          
          # Add the current user to the microk8s group
          echo "Adding current user to the microk8s group"
          sudo usermod -a -G microk8s $(whoami)
          chown -R $(whoami) ~/.kube

          # Apply changes to group membership
          newgrp microk8s
          /snap/microk8s/current/usr/bin/env

          # Enable MetalLB on MicroK8s
          sudo microk8s enable metallb:$subnet

          namespace="controller-$CONTROLLER"
          service_name="controller-service-lb"

          # Display services layout
          echo "Services layout:"
          sudo microk8s.kubectl get services -n $namespace

          # Create a LoadBalancer service
          sudo microk8s.kubectl apply -f - <<EOF
          apiVersion: v1
          kind: Service
          metadata:
            name: $service_name
            namespace: $namespace
          spec:
            ipFamilies:
            - IPv4
            ipFamilyPolicy: SingleStack
            ports:
            - name: api-server
              port: 17070
              protocol: TCP
              targetPort: 17070
            selector:
              app.kubernetes.io/name: controller
            sessionAffinity: None
            type: LoadBalancer
          EOF
          echo "Load Balancer service created."

          # Display services layout with the Load Balancer
          echo "Services layout with the Load Balancer:"
          sudo microk8s.kubectl get services -n $namespace

          echo "Waiting for external IP for $service_name in $namespace..."
          external_ip=""
          attempts=0
          max_attempts=3

          while [ -z "$external_ip" ] && [ "$attempts" -lt "$max_attempts" ]; do
            external_ip="$(sudo microk8s.kubectl get service -n "$namespace" "$service_name" -o=jsonpath='{.status.loadBalancer.ingress[0].ip}')"
            if [ -z "$external_ip" ]; then
              echo "External IP not yet assigned. Waiting..."
              attempts=$((attempts + 1))
              sleep 5
            fi
          done

          if [ -z "$external_ip" ]; then
            echo "External IP not assigned after $max_attempts attempts. Exiting..."
            exit 1
          else
            echo "LoadBalancer service ready at IP: $external_ip"
          fi
          
          # Write the Terraform configuration file
          echo "
          terraform {
            required_providers {
              juju = {
                source = \"juju/juju\"
                version = \">= 0.9.1\"
              }
            }
          }
          provider \"juju\" {
            controller_addresses = \"$external_ip:17070\"
            username = \"$JUJU_USERNAME\"
            password = \"$JUJU_PASSWORD\"
            ca_certificate = \"$JUJU_CA_CERT\"
          }

          resource \"juju_model\" \"testmodel\" {
            name = \"test-model\"
          }

          resource \"juju_application\" \"testapp\" {
            name = \"juju-qa-test\"
            model = juju_model.testmodel.name

            charm {
              name = \"juju-qa-test\"
            }
          }
          " > ./terraform_config.tf

          echo "====== Using Terraform Config: ==========="
          cat ./terraform_config.tf
          echo "=========================================="

          # Initialize and apply Terraform
          echo "Initializing Terraform..."
          terraform init
          echo "Planning Terraform changes..."
          terraform plan
          echo "Applying Terraform changes..."
          terraform apply --auto-approve

          # Cleanup: Remove Terraform configuration file
          rm ./terraform_config.tf