nixos/prometheus-domain-exporter: init

nixos/modules/services/monitoring/prometheus/exporters.nix

@@ -28,6 +28,7 @@ let
     "blackbox"
     "collectd"
     "dnsmasq"
+    "domain"
     "dovecot"
     "fritzbox"
     "json"

nixos/modules/services/monitoring/prometheus/exporters/domain.nix

@@ -0,0 +1,19 @@
+{ config, lib, pkgs, options }:
+
+with lib;
+
+let
+  cfg = config.services.prometheus.exporters.domain;
+in
+{
+  port = 9222;
+  serviceOpts = {
+    serviceConfig = {
+      ExecStart = ''
+        ${pkgs.prometheus-domain-exporter}/bin/domain_exporter \
+          --bind ${cfg.listenAddress}:${toString cfg.port} \
+          ${concatStringsSep " \\\n  " cfg.extraFlags}
+      '';
+    };
+  };
+}

nixos/tests/prometheus-exporters.nix

@@ -201,6 +201,22 @@ let
       '';
     };
 
+    # Access to WHOIS server is required to properly test this exporter, so
+    # just perform basic sanity check that the exporter is running and returns
+    # a failure.
+    domain = {
+      exporterConfig = {
+        enable = true;
+      };
+      exporterTest = ''
+        wait_for_unit("prometheus-domain-exporter.service")
+        wait_for_open_port(9222)
+        succeed(
+            "curl -sSf 'http://localhost:9222/probe?target=nixos.org' | grep -q 'domain_probe_success 0'"
+        )
+      '';
+    };
+
     dovecot = {
       exporterConfig = {
         enable = true;

pkgs/servers/monitoring/prometheus/domain-exporter.nix

@@ -15,6 +15,8 @@ buildGoModule rec {
 
   doCheck = false; # needs internet connection
 
+  passthru.tests = { inherit (nixosTests.prometheus-exporters) domain; };
+
   meta = with lib; {
     homepage = "https://github.com/caarlos0/domain_exporter";
     description = "Exports the expiration time of your domains as prometheus metrics";