matrix-docker-ansible-deploy/roles/matrix-prometheus/tasks/setup.yml

---

#
# Tasks related to setting up matrix-prometheus
#

- name: Ensure matrix-prometheus image is pulled
  docker_image:
    name: "{{ matrix_prometheus_docker_image }}"
    source: "{{ 'pull' if ansible_version.major > 2 or ansible_version.minor > 7 else omit }}"
    force_source: "{{ matrix_prometheus_docker_image_force_pull if ansible_version.major > 2 or ansible_version.minor >= 8 else omit }}"
    force: "{{ omit if ansible_version.major > 2 or ansible_version.minor >= 8 else matrix_prometheus_docker_image_force_pull }}"
  when: "matrix_prometheus_enabled|bool"

- name: Ensure Prometheus paths exists
  file:
    path: "{{ item }}"
    state: directory
    mode: 0750
    owner: "{{ matrix_user_username }}"
    group: "{{ matrix_user_groupname }}"
  with_items:
    - "{{ matrix_prometheus_base_path }}"
    - "{{ matrix_prometheus_config_path }}"
    - "{{ matrix_prometheus_data_path }}"
  when: matrix_prometheus_enabled|bool

- block:
    # Well, this actually creates the network if it doesn't exist, but..
    # The network should have been created by `matrix-base` already.
    # We don't rely on that other call and its result, because it runs
    # on `--tags=setup-all`, but will get skipped during `--tags=setup-prometheus`.
    - name: Fetch Matrix Docker network details
      docker_network:
        name: "{{ matrix_docker_network }}"
        driver: bridge
      register: matrix_docker_network_info

    - set_fact:
        matrix_prometheus_endpoint_node_targets: ["{{ matrix_docker_network_info.network.IPAM.Config[0].Gateway }}:9100"]
  when: "matrix_prometheus_enabled|bool and matrix_prometheus_node_exporter_enabled|bool and matrix_prometheus_endpoint_node_targets|length == 0"

- name: Ensure prometheus.yml installed
  copy:
    content: "{{ matrix_prometheus_configuration|to_nice_yaml }}"
    dest: "{{ matrix_prometheus_config_path }}/prometheus.yml"
    mode: 0644
    owner: "{{ matrix_user_username }}"
    group: "{{ matrix_user_groupname }}"
  when: matrix_prometheus_enabled|bool

- name: Download synapse-v2.rules
  get_url:
    url: "{{ matrix_synapse_prometheus_rules_download_url }}"
    dest: "{{ matrix_prometheus_config_path }}/synapse-v2.rules"
    force: true
    mode: 0440
    owner: "{{ matrix_user_username }}"
    group: "{{ matrix_user_groupname }}"
  when: matrix_prometheus_enabled|bool


- name: Ensure matrix-prometheus.service installed
  template:
    src: "{{ role_path }}/templates/systemd/matrix-prometheus.service.j2"
    dest: "{{ matrix_systemd_path }}/matrix-prometheus.service"
    mode: 0644
  register: matrix_prometheus_systemd_service_result
  when: matrix_prometheus_enabled|bool

- name: Ensure systemd reloaded after matrix-prometheus.service installation
  service:
    daemon_reload: yes
  when: "matrix_prometheus_enabled|bool and matrix_prometheus_systemd_service_result.changed"

#
# Tasks related to getting rid of matrix-prometheus (if it was previously enabled)
#

- name: Check existence of matrix-prometheus service
  stat:
    path: "{{ matrix_systemd_path }}/matrix-prometheus.service"
  register: matrix_prometheus_service_stat

- name: Ensure matrix-prometheus is stopped
  service:
    name: matrix-prometheus
    state: stopped
    daemon_reload: yes
  register: stopping_result
  when: "not matrix_prometheus_enabled|bool and matrix_prometheus_service_stat.stat.exists"

- name: Ensure matrix-prometheus.service doesn't exist
  file:
    path: "{{ matrix_systemd_path }}/matrix-prometheus.service"
    state: absent
  when: "not matrix_prometheus_enabled|bool and matrix_prometheus_service_stat.stat.exists"

- name: Ensure systemd reloaded after matrix-prometheus.service removal
  service:
    daemon_reload: yes
  when: "not matrix_prometheus_enabled|bool and matrix_prometheus_service_stat.stat.exists"

- name: Ensure matrix-prometheus Docker image doesn't exist
  docker_image:
    name: "{{ matrix_prometheus_docker_image }}"
    state: absent
  when: "not matrix_prometheus_enabled|bool"