version: 2.1
orbs:
  go: circleci/go@0.2.0
  prometheus: prometheus/prometheus@0.16.0
jobs:
  test:
    parameters:
      go_version:
        type: string
      run_style_and_unused:
        type: boolean
        default: false
      run_lint:
        type: boolean
        default: false
      use_gomod_cache:
        type: boolean
        default: true
    docker:
      - image: circleci/golang:<< parameters.go_version >>
    working_directory: /go/src/github.com/prometheus/client_golang
    steps:
      - checkout
      - when:
          condition: << parameters.use_gomod_cache >>
          steps:
            - go/load-cache:
                key: v1-go<< parameters.go_version >>
      - run: make check_license test
      - when:
          condition: << parameters.run_lint >>
          steps:
            - run: make lint
      - when:
          condition: << parameters.run_style_and_unused >>
          steps:
            - run: make style unused
      - when:
          condition: << parameters.use_gomod_cache >>
          steps:
            - go/save-cache:
                key: v1-go<< parameters.go_version >>
      - store_test_results:
          path: test-results
workflows:
  version: 2
  client_golang:
    jobs:
      # Refer to README.md for the currently supported versions.
      - test:
          name: go-1-15
          go_version: "1.15"
          run_lint: true
      - test:
          name: go-1-16
          go_version: "1.16"
          run_lint: true
      - test:
          name: go-1-17
          go_version: "1.17"
          run_lint: true
          run_style_and_unused: true