---
- name: generate apt pin file for exporter-modbus package
  when: prometheus_exporter_modbus_version is defined
  copy:
    dest: "/etc/apt/preferences.d/prom-exporter-modbus.pref"
    content: |
      Package: prom-exporter-modbus
      Pin: version {{ prometheus_exporter_modbus_version }}-1
      Pin-Priority: 1001

- name: remove apt pin file for exporter-modbus package
  when: prometheus_exporter_modbus_version is not defined
  file:
    path: "/etc/apt/preferences.d/prom-exporter-modbus.pref"
    state: absent

- name: install apt packages
  apt:
    name: "prom-exporter-modbus{% if prometheus_exporter_modbus_version is defined %}={{ prometheus_exporter_modbus_version }}-1{% endif %}"
    state: present
    allow_downgrade: yes
  notify: restart prometheus-modbus-exporter

- name: create config directory
  file:
    path: /etc/prometheus/exporter/modbus
    state: directory

- name: generate configuration
  template:
    src: config.yml.j2
    dest: /etc/prometheus/exporter/modbus/config.yml
  notify: restart prometheus-modbus-exporter

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

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

- name: register exporter
  copy:
    content: |
      location = /modbus {
          proxy_pass http://127.0.0.1:9602/metrics;
      }
      location = /modbus/probe {
          proxy_pass http://127.0.0.1:9602/modbus;
      }
    dest: /etc/prometheus/exporter/modbus.locations
  notify: reload nginx