version: 2
jobs:
  build:
    working_directory: /app
    docker:
      - image: docker:17.05.0-ce-git
        auth:
          #Put the contents of keyfile.json into an environment variable for the build called GCR_CREDS, which is then passed in.
          username: _json_key
          password: $GOOGLE_AUTH
    steps:
      - checkout
      - setup_remote_docker:
          # Requires this version to be able to use docker-compose
          version: 17.05.0-ce
      - run:
          name: Install dependencies
          command: |
            apk add --no-cache \
              py-pip=9.0.0-r1
            pip install \
              docker-compose==1.12.0
      - restore_cache:
          keys:
            - v1-{{ .Branch }}
          paths:
            - /caches/application.tar
      - run:
          name: Load Docker image layer cache
          command: |
            set +o pipefail
            docker load -i /caches/application.tar | true
      - run:
          name: Build application Docker image
          command: |
            # docker build --cache-from=application -t application .
            docker-compose -f ./docker-compose-test.yml build
      - run:
          name: Save Docker image layer cache
          command: |
            mkdir -p /caches
            docker save -o /caches/application.tar application
      - save_cache:
          key: v1-{{ .Branch }}-{{ epoch }}
          paths:
            - /caches/application.tar
      - run:
          name: Run tests
          command: |
            docker run -d -p 27017:27017 --network="bridge" app-db:latest
            docker run -d -p 6379:6379 --network="bridge" app-cache:latest
            docker run -p 9000:9000 --network="bridge" application:latest /opt/app/test.sh
      - run:
          name: Dump Google Cloud Credentials to file
          command: echo ${GOOGLE_AUTH} > ${HOME}/gcp-key.json
      - deploy:
          name: Push application Docker image
          command: |
            if [ "${CIRCLE_BRANCH}" == "master" ]; then
              echo "Deploying to Google Cloud...
              gcloud auth activate-service-account --key-file ${HOME}/gcp-key.json
              gcloud --quiet config set project ${GOOGLE_PROJECT_ID}
              gcloud --quiet config set compute/zone ${GOOGLE_COMPUTE_ZONE}
              # gcloud --quiet container clusters get-credentials ${GOOGLE_CLUSTER_NAME}
              gcloud -q app deploy --project
            fi