---
- hosts: all
  become: true
  vars:
    container_name: ansible-deploy-ci-test

  tasks:
    - name: Register previous image name for possible fallback
      shell: "docker ps --filter name=ansible-deploy-ci-test --format='{{json .Image}}'"
      register: prev

    - set_fact:
        prev_image_name="{{ prev.stdout }}"

    - name: Docker login
      docker_login:
        username: "{{ docker_user }}"
        password: "{{ docker_password }}"
        registry: "{{ docker_registry }}"

    - name: Pull app image
      docker_image:
        name: "{{ image_name }}"
        source: pull

    - name: Stop running container
      docker_container:
        name: "{{ container_name }}"
        image: "{{ image_name }}"
        state: absent

    - name: Create app container
      docker_container:
        name: "{{ container_name }}"
        image: "{{ image_name }}"
        state: started
        ports:
          - "80:80"

    - name: Test app responds on port 80
      uri:
        url: "http://{{ ansible_host }}:80"
      ignore_errors: True
      register: result

    - name: Rollback if app isn't responding
      docker_container:
        name: "{{ container_name }}"
        image: "{{ prev_image_name }}"
        state: started
        ports:
          - "80:80"
      when: result is failed