---
- name: check if prometheus apt component of spreadspace repo is enabled
  assert:
    msg: "please enable the 'prometheus' component of spreadspace repo using 'spreadspace_apt_repo_components'"
    that:
    - spreadspace_apt_repo_components is defined
    - "'prometheus' in spreadspace_apt_repo_components"

- name: prepare storage volume for /var/lib/prometheus
  when: prometheus_server_storage is defined
  vars:
    storage_volume: "{{ prometheus_server_storage | combine({'dest': '/var/lib/prometheus'}) }}"
  include_role:
    name: "storage/{{ prometheus_server_storage.type }}/volume"

- name: install apt packages
  apt:
    name: prom-server
    state: present

- name: add user for server
  user:
    name: prometheus
    system: yes
    home: /var/lib/prometheus
    create_home: no

- name: create data directory
  file:
    path: /var/lib/prometheus/metrics2
    state: directory
    owner: prometheus
    group: prometheus

- name: create TLS CA and certificates
  import_tasks: tls.yml

- name: create configuration directories
  loop:
  - jobs
  - rules
  - targets
  file:
    path: "/etc/prometheus/{{ item }}"
    state: directory

- name: create sub-directroy for all exporter types in jobs directory
  loop: "{{ prometheus_server_jobs }}"
  file:
    path: "/etc/prometheus/jobs/{{ item }}"
    state: directory

- name: generate targets config
  loop: "{{ prometheus_zone_targets }}"
  copy:
    content: |
      - targets: [ "{{ hostvars[item].prometheus_scrape_endpoint }}" ]
        labels:
          instance: "{{ item }}"
    dest: "/etc/prometheus/targets/{{ item }}.yml"

- name: enable targets for jobs
  loop: "{{ hostvars | prometheus_job_targets(prometheus_server_jobs, prometheus_zone_targets) }}"
  loop_control:
    label: "{{ item.job }} -> {{ item.target }}"
  file:
    src: "{{ item.enabled | ternary('/etc/prometheus/targets/' + item.target + '.yml', omit) }}"
    path: "/etc/prometheus/jobs/{{ item.job }}/{{ item.target }}.yml"
    state: "{{ item.enabled | ternary('link', 'absent') }}"

- name: generate rules files for all jobs
  loop: "{{ prometheus_server_jobs | union(['prometheus']) }}"
  template:
    src: rules.yml.j2
    dest: "/etc/prometheus/rules/{{ item }}.yml"
    validate: "promtool check rules %s"
  notify: reload prometheus

- name: generate configuration file
  template:
    src: prometheus.yml.j2
    dest: /etc/prometheus/prometheus.yml
    validate: "promtool check config %s"
  notify: reload prometheus

- name: generate systemd service unit
  template:
    src: prometheus.service.j2
    dest: /etc/systemd/system/prometheus.service
  notify: restart prometheus

- name: make sure prometheus is enabled and started
  systemd:
    name: prometheus.service
    daemon_reload: yes
    state: started
    enabled: yes