feat: add nzbget_exporter (#368)

- add nzbget_exporter class
- add exporter to nzbget class

Reviewed-on: #368

hieradata/roles/apps/media/nzbget.yaml

@@ -4,6 +4,7 @@ hiera_include:
   - nzbget
   - profiles::media::nzbget
   - profiles::nginx::ldapauth
+  - exporters::nzbget_exporter
 
 profiles::packages::include:
   unrar: {}
@@ -13,6 +14,9 @@ nzbget::params::user: nzbget
 nzbget::params::group: media
 nzbget::params::manage_group: false
 
+# nzbget_exporter
+exporters::nzbget_exporter::enable: true
+
 # additional altnames
 profiles::pki::vault::alt_names:
   - nzbget.main.unkin.net
@@ -62,6 +66,9 @@ profiles::consul::client::node_rules:
   - resource: service
     segment: nzbget
     disposition: write
+  - resource: service
+    segment: nzbget_exporter
+    disposition: write
 
 profiles::yum::global::repos:
   rpmfusion-free:

modules/exporters/manifests/nzbget_exporter.pp

@@ -0,0 +1,68 @@
+class exporters::nzbget_exporter (
+  Boolean $enable         = false,
+  String  $user           = 'nzbget_exporter',
+  String  $group          = 'nzbget_exporter',
+  Boolean $manage_user    = true,
+  Boolean $manage_service = true,
+  Stdlib::Port $port      = 9452,
+  Stdlib::HTTPUrl $url    = 'http://127.0.0.1:6789',
+  Stdlib::Absolutepath $exec_path = '/usr/bin/nzbget_exporter',
+){
+
+  if $enable {
+
+    # install required package
+    package {'nzbget_exporter':
+      ensure => installed,
+    }
+
+    # manage the user/group
+    if $manage_user {
+      group { $group:
+        ensure => present,
+      }
+
+      user { $user:
+        ensure     => present,
+        shell      => '/usr/sbin/nologin',
+        groups     => $group,
+        managehome => true,
+      }
+    }
+
+    # manage the systemd service
+    if $manage_service {
+
+      # Use these in notifications or file resources
+      systemd::unit_file { 'nzbget_exporter.service':
+        content   => template('exporters/nzbget_exporter.service.erb'),
+        enable    => true,
+        active    => true,
+        subscribe => Package['nzbget_exporter'],
+      }
+    }
+
+    # manage consul service
+    consul::service { 'nzbget_exporter':
+      service_name => 'nzbget_exporter',
+      address      => $facts['networking']['ip'],
+      port         => $port,
+      tags         => [
+        'metrics',
+        'metrics_scheme=http',
+        'metrics_job=nzbget',
+      ],
+      checks       => [
+        {
+          id              => 'nzbget_exporter_http_check',
+          name            => 'nzbget_exporter HTTP Check',
+          http            => "http://${facts['networking']['fqdn']}:${port}/metrics",
+          method          => 'GET',
+          tls_skip_verify => true,
+          interval        => '10s',
+          timeout         => '1s',
+        },
+      ],
+    }
+  }
+}

modules/exporters/templates/nzbget_exporter.service.erb

@@ -0,0 +1,15 @@
+[Unit]
+Description=Prometheus nzbget_exporter
+Wants=network-online.target
+After=network-online.target
+
+[Service]
+User=<%= @user %>
+Group=<%= @group %>
+ExecStart=<%= @exec_path %> --host=<%= @url %>
+ExecReload=/bin/kill -HUP $MAINPID
+KillMode=process
+Restart=always
+
+[Install]
+WantedBy=multi-user.target