arbtt service: init

nixos/modules/module-list.nix

@@ -293,6 +293,7 @@
   ./services/misc/uhub.nix
   ./services/misc/zookeeper.nix
   ./services/monitoring/apcupsd.nix
+  ./services/monitoring/arbtt.nix
   ./services/monitoring/bosun.nix
   ./services/monitoring/cadvisor.nix
   ./services/monitoring/collectd.nix

nixos/modules/services/monitoring/arbtt.nix

@@ -0,0 +1,63 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.arbtt;
+in {
+  options = {
+    services.arbtt = {
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        example = true;
+        description = ''
+          Enable the arbtt statistics capture service.
+        '';
+      };
+
+      package = mkOption {
+        type = types.package;
+        default = pkgs.haskellPackages.arbtt;
+        defaultText = "pkgs.haskellPackages.arbtt";
+        example = literalExample "pkgs.haskellPackages.arbtt";
+        description = ''
+          The package to use for the arbtt binaries.
+        '';
+      };
+
+      logFile = mkOption {
+        type = types.str;
+        default = "%h/.arbtt/capture.log";
+        example = "/home/username/.arbtt-capture.log";
+        description = ''
+          The log file for captured samples.
+        '';
+      };
+
+      sampleRate = mkOption {
+        type = types.int;
+        default = 60;
+        example = 120;
+        description = ''
+          The sampling interval in seconds.
+        '';
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    systemd.user.services.arbtt = {
+      description = "arbtt statistics capture service";
+      wantedBy = [ "multi-user.target" ];
+
+      serviceConfig = {
+        Type = "simple";
+        ExecStart = "${cfg.package}/bin/arbtt-capture --logfile=${cfg.logFile} --sample-rate=${toString cfg.sampleRate}";
+        Restart = "always";
+      };
+    };
+  };
+
+  meta.maintainers = [ maintainers.michaelpj ];
+}