server.yml

---
- hosts: backend
  gather_facts: no
  vars:
    - app_source_zip: "apps/server.zip"
    - app_source_zip_remote: "server.zip"

  tasks:
    - name: Install java11
      become: yes
      apt:
        name: default-jre
        state: latest

    - name: Install unzip
      become: yes
      apt:
        name: unzip
        state: latest

    - name: Build the application
      retries: 10
      delay: 5
      shell: "./scripts/build-server.sh {{ app_source_name }}"
      delegate_to: 127.0.0.1

    - name: Upload the application
      synchronize:
        src: "{{ app_source_zip }}"
        dest: "{{ app_source_zip_remote }}"

    # Registering the service before unpacking the app allows to make sure the app is stopped
    # on the first deployment.
    - name: Add the systemd service
      become: yes
      template:
        src: "{{ app_systemd_service_source }}"
        dest: "/etc/systemd/system/{{ app_systemd_service_name }}.service"

    - name: Pick up systemd changes
      become: yes
      systemd:
        daemon_reload: yes

    - name: Make sure the application is stopped
      become: yes
      systemd:
        name: "{{ app_systemd_service_name }}"
        state: stopped

    # This is crucial to avoid polluting the classpath with old jars after upgrading dependencies
    - name: Delete old application (important!)
      become: yes
      file:
        path: "{{ app_home }}/{{ app_directory_name }}"
        state: absent

    - name: Create the app group
      become: yes
      group:
        name: "{{ app_group }}"
        state: present

    - name: Create the app user
      become: yes
      user:
        name: "{{ app_user }}"
        group: "{{ app_group }}"
        state: present
        system: yes

    - name: Create the app directory
      become: yes
      file:
        path: "{{ app_home }}"
        state: directory
        owner: "{{ app_user }}"
        group: "{{ app_group }}"

    - name: Unpack the application
      become: yes
      unarchive:
        remote_src: yes
        src: "{{ app_source_zip_remote }}"
        dest: "{{ app_home }}"
        owner: "{{ app_user }}"
        group: "{{ app_group }}"

    - name: Set the application config
      become: yes
      template:
        src: "{{ app_env_config_source }}"
        dest: "{{ app_env_config_file }}"
        owner: "{{ app_user }}"
        group: "{{ app_group }}"

    - name: Set the application files permissions
      become: yes
      file:
        dest: "{{ app_home }}"
        owner: "{{ app_user }}"
        group: "{{ app_group }}"
        recurse: yes

    - name: Make sure the application is started
      become: yes
      systemd:
        name: "{{ app_systemd_service_name }}"
        state: started

    - name: Enable the application to run on system startup
      become: yes
      systemd:
        name: "{{ app_systemd_service_name }}"
        enabled: yes

# TODO: Check service is healthy by querying localhost:9000/health