terraform-plan.yml

name: Terraform Plan

on:
  pull_request:
    paths:
      - '**.tf'
      - '**.json'
      - '**.tfvars'

env:
  AWS_REGION: us-east-1
  PYTHON_MODULES_DIR: modules/python
jobs:
  setup-matrix:
    runs-on: ubuntu-latest
    name: Setup test matrix scenarios
    steps:
      - name: Checkout Repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Setup test matrix scenarios
        id: setup-matrix-scenarios
        run: |
          set -eux
          matrix=$(find $GITHUB_WORKSPACE/scenarios/ -name "*.tfvars" | awk -F'/' '{split($11, file_name, "."); split(file_name[1], cloud_region, "-");region= (length(cloud_region) > 1) ? substr($11, index($11, "-") + 1) : ""; cloud=cloud_region[1]; gsub(".json", "", region); print "{\"cloud\": \"" cloud "\", \"file_name\": \"" file_name[1] "\", " (region != "" ? "\"region\": \"" region "\", " : "") "\"scenario_type\": \"" $8 "\", \"scenario_name\": \"" $9 "\"},"}' | sort | uniq | sed 's/,$/,/')
          matrix_array="[${matrix%,}]"

          file_changes=$(git diff --name-only -r origin/main HEAD)
          echo "PR file changes: $file_changes"

          if [ -z "$file_changes" ]; then
            matrix_combinations=null
            echo "matrix_combinations=$matrix_combinations" >> "$GITHUB_OUTPUT"
          else
            cloud_changes=$(echo "$file_changes" | grep -E '\.tf$' | awk -F'/' '{print $3}' | uniq)
            echo "File changes related to cloud: $cloud_changes"

            run_all_tests=false
            module_matrix='[]'
            scenario_matrix='[]'
            if [ $(echo "$cloud_changes" | wc -w) -eq 1 ]; then
              cloud=$(echo "$cloud_changes" | cut -d' ' -f1)
              module_matrix=$(echo "$matrix_array" | jq --arg cloud_value "$cloud" '. | map(select(.cloud == $cloud_value))')
            elif [ $(echo "$cloud_changes" | wc -w) -eq 0 ]; then
              run_all_tests=false
            else
              run_all_tests=true
              module_matrix=$(echo "$matrix_array")
            fi
            echo "module_matrix: $module_matrix"
            if [ "$run_all_tests" = false ]; then
              changed_scenario_names=$(echo "$file_changes" | grep -E '^scenarios/' | awk -F'/' '{print $3}' | tr ' ' '\n' | sort -u)
              echo "Test scenarios changed: $changed_scenario_names"
              for scenario_name in $changed_scenario_names; do
                filtered_objects=$(echo "$matrix_array" | jq --arg scenario_value "$scenario_name" '. | map(select(.scenario_name == $scenario_value))')
                scenario_matrix=$(echo "$scenario_matrix $filtered_objects" | jq -s 'flatten | unique')
              done
            fi
            updated_matrix=$(echo "$module_matrix $scenario_matrix" | jq -s 'flatten | unique')
            echo "Test scenarios to run: $updated_matrix"
            updated_matrix="${updated_matrix//$'\n'/''}"
            matrix_combinations="{\"include\": ${updated_matrix%?}}"
            echo "matrix_combinations={\"include\": ${updated_matrix} }" >> "$GITHUB_OUTPUT"
          fi
          echo "matrix_combinations: $matrix_combinations"
    outputs:
      matrix-combinations: ${{ steps.setup-matrix-scenarios.outputs.matrix_combinations }}

  terraform-plan:
    permissions:
      id-token: write
      contents: read
    needs: setup-matrix
    if: ${{ needs.setup-matrix.result == 'success' && needs.setup-matrix.outputs.matrix-combinations != 'null' && needs.setup-matrix.outputs.matrix-combinations['inlcude'] != '[]' }}
    strategy:
      fail-fast: false
      max-parallel: 3
      matrix: ${{ fromJson(needs.setup-matrix.outputs.matrix-combinations) }}
    runs-on: ubuntu-latest
    name: ${{ matrix.cloud }}-${{ matrix.scenario_type }}-${{ matrix.scenario_name }} ${{ matrix.region }}

    steps:
      - name: Checkout Repository
        uses: actions/checkout@v4

      - name: Get job id and set env
        run: |
          echo "RUN_ID=123456789" >> "$GITHUB_ENV"
          echo "TERRAFORM_INPUT_FILE=$GITHUB_WORKSPACE/scenarios/${{ matrix.scenario_type }}/${{ matrix.scenario_name }}/terraform-inputs/${{ matrix.file_name }}.tfvars" >> "$GITHUB_ENV"
          echo "TERRAFORM_TEST_INPUT_FILE=$GITHUB_WORKSPACE/scenarios/${{ matrix.scenario_type }}/${{ matrix.scenario_name }}/terraform-test-inputs/${{ matrix.file_name }}.json" >> "$GITHUB_ENV"
          echo "TERRAFORM_MODULES_DIR=modules/terraform/${{ matrix.cloud }}" >> "$GITHUB_ENV"
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Create JSON Input
        run: |
          INPUT_JSON_OBJECT=$(jq . ${{ env.TERRAFORM_TEST_INPUT_FILE }})
          INPUT_JSON_STRING=$(echo $INPUT_JSON_OBJECT | jq -c .)
          echo "INPUT_JSON=$INPUT_JSON_STRING" >> "$GITHUB_ENV"

      - name: Azure login
        if: ${{ matrix.cloud == 'azure' }}
        uses: azure/login@v1
        with:
          client-id: ${{ secrets.AZURE_MI }}
          tenant-id: ${{ secrets.AZURE_TENANT_ID }}
          subscription-id: ${{ secrets.AZURE_SUBSCRIPTION_ID }}

      - name: AWS login
        if: ${{ matrix.cloud == 'aws' }}
        uses: aws-actions/configure-aws-credentials@v2
        with:
          aws-access-key-id: ${{ secrets.AWS_ACCESS_KEY_ID }}
          aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
          aws-region: ${{ env.AWS_REGION }}

      - name: Setup Terraform
        uses: hashicorp/setup-terraform@v2
        with:
          terraform_version: 1.5.6

      - name: Terraform Init
        working-directory: ${{ env.TERRAFORM_MODULES_DIR }}
        run: terraform init

      - name: Terraform Plan
        working-directory: ${{ env.TERRAFORM_MODULES_DIR }}
        run: terraform plan -var-file "$TERRAFORM_INPUT_FILE" -var="json_input=$INPUT_JSON"