Medium – Continious delivery / integration for everyone – CircleCI

config.yml

##
# Hello CircleCI! Version 1 is obsolete so...
version: 2

##
# Define our enviroment.
# This "defaults: &defaults" magic is known as Yaml anchors
# it allows us point to this config from several parts of the document. Neat!
#
defaults: &defaults
  working_directory: ~/project
  docker:
    - image: circleci/node:latest

android_defaults: &android_defaults
  working_directory: ~/project/android
  docker:
    - image: farwayer/react-native
  environment:
    # This configuration works best for our project, but you might want to experiment here a little
    - LANG: "en_US.UTF-8"
    - _JAVA_OPTIONS: "-Xms518m -Xmx2048m"
    - GRADLE_OPTS: '-Dorg.gradle.jvmargs="-Xmx2048m -XX:+HeapDumpOnOutOfMemoryError"'
    - BUILD_THREADS: 2

ios_defaults: &ios_defaults
  working_directory: ~/project/ios
  macos:
      xcode: "9.1.0"
  environment:
    - LANG: "en_US.UTF-8"
    # This is important for Fastlane because we create keychain base on this
    - MATCH_KEYCHAIN_NAME: "circle"
    - MATCH_KEYCHAIN_PASSWORD: "circle"

# ...let's define our jobs

jobs:
  # let's install our project's dependenices...
  install-dependencies:
    <<: *defaults
    steps:
      - checkout
      - attach_workspace:
          at: ~/project
      # ...restore cache if there is any...
      - restore_cache:
          keys:
          - v1-0-dependencies-{{ checksum "package.json" }}
          # fallback to using the latest cache if no exact match is found
          - v1-0-dependencies-
      # ... of not run yarn...
      - run:
          name: Install Dependencies
          command: yarn
      # ... cache the dependencies...
      - save_cache:
          key: v1-0-dependencies-{{ checksum "package.json" }}
          paths:
            - node_modules
            - yarn.lock
      # ...and persist to the workplace, because we want to access this within the workflows (other jobs, etc.)
      - persist_to_workspace:
          root: .
          paths: .
  # Introduce Flow job – let's staticaly check our code...
  flow:
    <<: *defaults
    steps:
      - attach_workspace:
          at: ~/project
      - run: yarn flow
  # Let's check the code style as well...
  lint:
    <<: *defaults
    steps:
      - attach_workspace:
         at: ~/project
      - run: yarn lint
  # Hell yeah! WE HAVE PLENTY OF THEM...
  unit-tests:
    <<: *defaults
    steps:
      - attach_workspace:
          at: ~/project
      - restore_cache:
          keys:
          - v1-0-jest-cache-{{ checksum "package.json" }}
          # fallback to using the latest cache if no exact match is found
          - v1-0-jest-cache-
      - run: yarn test:ci
      - save_cache:
          key: v1-0-jest-cache-{{ checksum "package.json" }}
          paths:
            - .jestCache
      - persist_to_workspace:
          root: .
          paths: .
  ##
  # This part is little bit tricky but still it's not a rocket sience...
  #
  ios-beta:
    <<: *ios_defaults 
    steps:
      # Attach to workplace (there are our saved node_modules)...
      - attach_workspace:
          at: ~/project
      # Install CocoaPod for managing our iOS native dependencies... 
      - run:
          name: Install CocoaPod Spec 
          command: curl https://cocoapods-specs.circleci.com/fetch-cocoapods-repo-from-s3.sh | bash -s cf
      # Install Fastlane...
      - run:
          name: Install Ruby and Fastlane
          command: |
           brew install ruby
           gem install fastlane
      # Install our native dependencies...
      - run:
          name: Update CocaPods dependencies
          command: pod install --verbose
          timeout: 1200
      # Update Fastlane (Fastane plugins, namely appcenter plugin)
      - run:
          name: Bundle update
          command: bundle update
      # Run our iOS deploy task
      - run:
          name: Fastlane
          command: bundle exec fastlane beta 
  ## 
  # Let's do almost the same for Android...
  # It could be worth it to create custom tailored Docker image with Fastlane preinstalled but I wanted to be explicit
  android-beta:
    <<: *android_defaults 
    steps:
      # Attach to workplace (there are our saved node_modules)...
      - attach_workspace:
          at: ~/darwin
      # Optimize build.gradle because memory limitation on our CircleCI machine...
      - run: 
          name: "Optimize build.gradle for CI"
          command: sed -i 's/2g/1g/' app/build.gradle
      # Install Fastlane
      - run:
          name: Install Fastlane  
          command: |
            gem install fastlane -NV
      # Update Fastlane
      - run:
          name: Bundle update
          command: bundle update
      # Run our Andorid deploy task
      - run:
          name: Fastlane 
          command: bundle exec fastlane beta 

# ...let's create our workflows

workflows:
  # yeah we use the latest version of CircleCI
  version: 2
  # Run under every PR this...
  test:
    # ...jobs...
    jobs:
      # At first, install dependencies...
      - install-dependencies
      # If it succeeded...
      # Run ESlint...
      - lint:
          requires:
            - install-dependencies
      # Run FlowType check...
      - flow:
          requires:
            - install-dependencies
      # Run Jest unit tests...
      - unit-tests:
          requires:
            - install-dependencies

      # If unit tests passed and we are on MASTER branch...

      # Deploy iOS...
      - ios-beta:
          requires: 
            - install-dependencies
            - unit-tests
          filters:
            branches:
              only: master
      # Deploy Android...
      - android-beta:
          requires: 
            - install-dependencies
            - unit-tests
          filters:
            branches:
              only: master