# This file is a template, and might need editing before it works on your project.
# Auto DevOps
# This CI/CD configuration provides a standard pipeline for
# * building a Docker image (using a buildpack if necessary),
# * storing the image in the container registry,
# * running tests from a buildpack,
# * running code quality analysis,
# * creating a review app for each topic branch,
# * and continuous deployment to production
#
# In order to deploy, you must have a Kubernetes cluster configured either
# via a project integration, or via group/project variables.
# AUTO_DEVOPS_DOMAIN must also be set as a variable at the group or project
# level, or manually added below.
#
# If you want to deploy to staging first, or enable canary deploys,
# uncomment the relevant jobs in the pipeline below.
#
# If Auto DevOps fails to detect the proper buildpack, or if you want to
# specify a custom buildpack, set a project variable `BUILDPACK_URL` to the
# repository URL of the buildpack.
# e.g. BUILDPACK_URL=https://github.com/heroku/heroku-buildpack-ruby.git#v142
# If you need multiple buildpacks, add a file to your project called
# `.buildpacks` that contains the URLs, one on each line, in order.
# Note: Auto CI does not work with multiple buildpacks yet

image: alpine:latest

variables:
  # AUTO_DEVOPS_DOMAIN is the application deployment domain and should be set as a variable at the group or project level.
  # AUTO_DEVOPS_DOMAIN: domain.example.com

  POSTGRES_USER: user
  POSTGRES_PASSWORD: testing-password
  POSTGRES_ENABLED: "true"
  POSTGRES_DB: $CI_ENVIRONMENT_SLUG

stages:
  - build
  - test
  - review
  - staging
  - canary
  - production
  - cleanup

build:
  stage: build
  image: docker:git
  services:
  - docker:dind
  variables:
    DOCKER_DRIVER: overlay2
  script:
    - setup_docker
    - build
  only:
    - branches

test:
  services:
    - postgres:latest
  variables:
    POSTGRES_DB: test
  stage: test
  image: gliderlabs/herokuish:latest
  script:
    - setup_test_db
    - cp -R . /tmp/app
    - /bin/herokuish buildpack test
  only:
    - branches

codequality:
  image: docker:latest
  variables:
    DOCKER_DRIVER: overlay2
  allow_failure: true
  services:
    - docker:dind
  script:
    - setup_docker
    - codeclimate
  artifacts:
    paths: [codeclimate.json]

review:
  stage: review
  script:
    - check_kube_domain
    - install_dependencies
    - download_chart
    - ensure_namespace
    - install_tiller
    - create_secret
    - deploy
  environment:
    name: review/$CI_COMMIT_REF_NAME
    url: http://$CI_PROJECT_PATH_SLUG-$CI_ENVIRONMENT_SLUG.$AUTO_DEVOPS_DOMAIN
    on_stop: stop_review
  only:
    refs:
      - branches
    kubernetes: active
  except:
    - master

stop_review:
  stage: cleanup
  variables:
    GIT_STRATEGY: none
  script:
    - install_dependencies
    - delete
  environment:
    name: review/$CI_COMMIT_REF_NAME
    action: stop
  when: manual
  allow_failure: true
  only:
    refs:
      - branches
    kubernetes: active
  except:
    - master

# Keys that start with a dot (.) will not be processed by GitLab CI.
# Staging and canary jobs are disabled by default, to enable them
# remove the dot (.) before the job name.
# https://docs.gitlab.com/ee/ci/yaml/README.html#hidden-keys

# Staging deploys are disabled by default since
# continuous deployment to production is enabled by default
# If you prefer to automatically deploy to staging and
# only manually promote to production, enable this job by removing the dot (.),
# and uncomment the `when: manual` line in the `production` job.

.staging:
  stage: staging
  script:
    - check_kube_domain
    - install_dependencies
    - download_chart
    - ensure_namespace
    - install_tiller
    - create_secret
    - deploy
  environment:
    name: staging
    url: http://$CI_PROJECT_PATH_SLUG-staging.$AUTO_DEVOPS_DOMAIN
  only:
    refs:
      - master
    kubernetes: active

# Canaries are disabled by default, but if you want them,
# and know what the downsides are, enable this job by removing the dot (.),
# and uncomment the `when: manual` line in the `production` job.

.canary:
  stage: canary
  script:
    - check_kube_domain
    - install_dependencies
    - download_chart
    - ensure_namespace
    - install_tiller
    - create_secret
    - deploy canary
  environment:
    name: production
    url: http://$CI_PROJECT_PATH_SLUG.$AUTO_DEVOPS_DOMAIN
  when: manual
  only:
    refs:
      - master
    kubernetes: active

# This job continuously deploys to production on every push to `master`.
# To make this a manual process, either because you're enabling `staging`
# or `canary` deploys, or you simply want more control over when you deploy
# to production, uncomment the `when: manual` line in the `production` job.

production:
  stage: production
  script:
    - check_kube_domain
    - install_dependencies
    - download_chart
    - ensure_namespace
    - install_tiller
    - create_secret
    - deploy
    - delete canary
  environment:
    name: production
    url: http://$CI_PROJECT_PATH_SLUG.$AUTO_DEVOPS_DOMAIN
#  when: manual
  only:
    refs:
      - master
    kubernetes: active

# ---------------------------------------------------------------------------

.auto_devops: &auto_devops |
  # Auto DevOps variables and functions
  [[ "$TRACE" ]] && set -x
  auto_database_url=postgres://${POSTGRES_USER}:${POSTGRES_PASSWORD}@${CI_ENVIRONMENT_SLUG}-postgres:5432/${POSTGRES_DB}
  export DATABASE_URL=${DATABASE_URL-$auto_database_url}
  export CI_APPLICATION_REPOSITORY=$CI_REGISTRY_IMAGE/$CI_COMMIT_REF_SLUG
  export CI_APPLICATION_TAG=$CI_COMMIT_SHA
  export CI_CONTAINER_NAME=ci_job_build_${CI_JOB_ID}
  export TILLER_NAMESPACE=$KUBE_NAMESPACE

  function codeclimate() {
    cc_opts="--env CODECLIMATE_CODE="$PWD" \
             --volume "$PWD":/code \
             --volume /var/run/docker.sock:/var/run/docker.sock \
             --volume /tmp/cc:/tmp/cc"

    docker run ${cc_opts} codeclimate/codeclimate init
    docker run ${cc_opts} codeclimate/codeclimate analyze -f json > codeclimate.json
  }

  function deploy() {
    track="${1-stable}"
    name="$CI_ENVIRONMENT_SLUG"

    if [[ "$track" != "stable" ]]; then
      name="$name-$track"
    fi

    replicas="1"
    service_enabled="false"
    postgres_enabled="$POSTGRES_ENABLED"
    # canary uses stable db
    [[ "$track" == "canary" ]] && postgres_enabled="false"

    env_track=$( echo $track | tr -s  '[:lower:]'  '[:upper:]' )
    env_slug=$( echo ${CI_ENVIRONMENT_SLUG//-/_} | tr -s  '[:lower:]'  '[:upper:]' )

    if [[ "$track" == "stable" ]]; then
      # for stable track get number of replicas from `PRODUCTION_REPLICAS`
      eval new_replicas=\$${env_slug}_REPLICAS
      service_enabled="true"
    else
      # for all tracks get number of replicas from `CANARY_PRODUCTION_REPLICAS`
      eval new_replicas=\$${env_track}_${env_slug}_REPLICAS
    fi
    if [[ -n "$new_replicas" ]]; then
      replicas="$new_replicas"
    fi

    helm upgrade --install \
      --wait \
      --set service.enabled="$service_enabled" \
      --set releaseOverride="$CI_ENVIRONMENT_SLUG" \
      --set image.repository="$CI_APPLICATION_REPOSITORY" \
      --set image.tag="$CI_APPLICATION_TAG" \
      --set image.pullPolicy=IfNotPresent \
      --set application.track="$track" \
      --set application.database_url="$DATABASE_URL" \
      --set service.url="$CI_ENVIRONMENT_URL" \
      --set replicaCount="$replicas" \
      --set postgresql.enabled="$postgres_enabled" \
      --set postgresql.nameOverride="postgres" \
      --set postgresql.postgresUser="$POSTGRES_USER" \
      --set postgresql.postgresPassword="$POSTGRES_PASSWORD" \
      --set postgresql.postgresDatabase="$POSTGRES_DB" \
      --namespace="$KUBE_NAMESPACE" \
      --version="$CI_PIPELINE_ID-$CI_JOB_ID" \
      "$name" \
      chart/
  }

  function install_dependencies() {
    apk add -U openssl curl tar gzip bash ca-certificates git
    wget -q -O /etc/apk/keys/sgerrand.rsa.pub https://raw.githubusercontent.com/sgerrand/alpine-pkg-glibc/master/sgerrand.rsa.pub
    wget https://github.com/sgerrand/alpine-pkg-glibc/releases/download/2.23-r3/glibc-2.23-r3.apk
    apk add glibc-2.23-r3.apk
    rm glibc-2.23-r3.apk

    curl https://kubernetes-helm.storage.googleapis.com/helm-v2.6.1-linux-amd64.tar.gz | tar zx
    mv linux-amd64/helm /usr/bin/
    helm version --client

    curl -L -o /usr/bin/kubectl https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl
    chmod +x /usr/bin/kubectl
    kubectl version --client
  }

  function setup_docker() {
    if ! docker info &>/dev/null; then
      if [ -z "$DOCKER_HOST" -a "$KUBERNETES_PORT" ]; then
        export DOCKER_HOST='tcp://localhost:2375'
      fi
    fi
  }

  function setup_test_db() {
    if [ -z ${KUBERNETES_PORT+x} ]; then
      DB_HOST=postgres
    else
      DB_HOST=localhost
    fi
    export DATABASE_URL="postgres://${POSTGRES_USER}:${POSTGRES_PASSWORD}@${DB_HOST}:5432/${POSTGRES_DB}"
  }

  function download_chart() {
    if [[ ! -d chart ]]; then
      auto_chart=${AUTO_DEVOPS_CHART:-gitlab/auto-deploy-app}
      auto_chart_name=$(basename $auto_chart)
      auto_chart_name=${auto_chart_name%.tgz}
    else
      auto_chart="chart"
      auto_chart_name="chart"
    fi

    helm init --client-only
    helm repo add gitlab https://charts.gitlab.io
    if [[ ! -d "$auto_chart" ]]; then
      helm fetch ${auto_chart} --untar
    fi
    if [ "$auto_chart_name" != "chart" ]; then
      mv ${auto_chart_name} chart
    fi

    helm dependency update chart/
    helm dependency build chart/
  }

  function ensure_namespace() {
    kubectl describe namespace "$KUBE_NAMESPACE" || kubectl create namespace "$KUBE_NAMESPACE"
  }

  function check_kube_domain() {
    if [ -z ${AUTO_DEVOPS_DOMAIN+x} ]; then
      echo "In order to deploy, AUTO_DEVOPS_DOMAIN must be set as a variable at the group or project level, or manually added in .gitlab-cy.yml"
      false
    else
      true
    fi
  }

  function build() {
    if [[ -f Dockerfile ]]; then
      echo "Building Dockerfile-based application..."
      docker build -t "$CI_APPLICATION_REPOSITORY:$CI_APPLICATION_TAG" .
    else
      echo "Building Heroku-based application using gliderlabs/herokuish docker image..."
      docker run -i --name="$CI_CONTAINER_NAME" -v "$(pwd):/tmp/app:ro" gliderlabs/herokuish /bin/herokuish buildpack build
      docker commit "$CI_CONTAINER_NAME" "$CI_APPLICATION_REPOSITORY:$CI_APPLICATION_TAG"
      docker rm "$CI_CONTAINER_NAME" >/dev/null
      echo ""

      echo "Configuring $CI_APPLICATION_REPOSITORY:$CI_APPLICATION_TAG docker image..."
      docker create --expose 5000 --env PORT=5000 --name="$CI_CONTAINER_NAME" "$CI_APPLICATION_REPOSITORY:$CI_APPLICATION_TAG" /bin/herokuish procfile start web
      docker commit "$CI_CONTAINER_NAME" "$CI_APPLICATION_REPOSITORY:$CI_APPLICATION_TAG"
      docker rm "$CI_CONTAINER_NAME" >/dev/null
      echo ""
    fi

    if [[ -n "$CI_REGISTRY_USER" ]]; then
      echo "Logging to GitLab Container Registry with CI credentials..."
      docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" "$CI_REGISTRY"
      echo ""
    fi

    echo "Pushing to GitLab Container Registry..."
    docker push "$CI_APPLICATION_REPOSITORY:$CI_APPLICATION_TAG"
    echo ""
  }

  function install_tiller() {
    echo "Checking Tiller..."
    helm init --upgrade
    kubectl rollout status -n "$TILLER_NAMESPACE" -w "deployment/tiller-deploy"
    if ! helm version --debug; then
      echo "Failed to init Tiller."
      return 1
    fi
    echo ""
  }

  function create_secret() {
    kubectl create secret -n "$KUBE_NAMESPACE" \
      docker-registry gitlab-registry \
      --docker-server="$CI_REGISTRY" \
      --docker-username="$CI_REGISTRY_USER" \
      --docker-password="$CI_REGISTRY_PASSWORD" \
      --docker-email="$GITLAB_USER_EMAIL" \
      -o yaml --dry-run | kubectl replace -n "$KUBE_NAMESPACE" --force -f -
  }

  function delete() {
    track="${1-stable}"
    name="$CI_ENVIRONMENT_SLUG"

    if [[ "$track" != "stable" ]]; then
      name="$name-$track"
    fi

    helm delete "$name" || true
  }

before_script:
  - *auto_devops