matrix-docker-ansible-deploy/roles/custom/matrix-prometheus-nginxlog-exporter/tasks/inject_into_nginx_proxy.yml

---

- name: Fail if matrix-nginx-proxy role already executed
  ansible.builtin.fail:
    msg: >-
      Trying to append prometheus-nginxlog-exporter's configuration to matrix-nginx-proxy,
      but it's pointless since the matrix-nginx-proxy role is already executed.
      To fix this, please change the order of roles in your playbook to make sure that
      the matrix-nginx-proxy role is run after the prometheus-nginxlog-exporter role.
  when: matrix_nginx_proxy_role_executed | default(False) | bool

- name: Generate prometheus-nginxlog-exporter's metrics proxying configuration for matrix-nginx-proxy (matrix.DOMAIN/metrics/nginxlog)
  ansible.builtin.set_fact:
    matrix_prometheus_nginxlog_exporter_matrix_nginx_proxy_metrics_configuration_matrix_domain: |
      location /metrics/nginxlog {
          {# Use the embedded DNS resolver in Docker containers to discover the service #}
          resolver 127.0.0.11 valid=5s;
          set $backend "{{ matrix_prometheus_nginxlog_exporter_container_hostname }}:{{ matrix_prometheus_nginxlog_exporter_container_metrics_port }}";
          proxy_pass http://$backend/metrics;
      }
  when: matrix_prometheus_nginxlog_exporter_metrics_proxying_enabled | bool and matrix_nginx_proxy_enabled | bool

- name: Register prometheus-nginxlog-exporter metrics proxying configuration with matrix-nginx-proxy (matrix.DOMAIN/metrics/nginxlog)
  ansible.builtin.set_fact:
    matrix_nginx_proxy_proxy_matrix_metrics_additional_system_location_configuration_blocks: |
      {{
        matrix_nginx_proxy_proxy_matrix_metrics_additional_system_location_configuration_blocks | default([])
        +
        [matrix_prometheus_nginxlog_exporter_matrix_nginx_proxy_metrics_configuration_matrix_domain]
      }}
  when: matrix_prometheus_nginxlog_exporter_metrics_proxying_enabled | bool