grafana: re-organize

services/grafana/qbittorrent-collector.nix

@@ -0,0 +1,60 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}:
+let
+  textfileDir = "/var/lib/prometheus-node-exporter-textfiles";
+
+  qbittorrentCollector = pkgs.writeShellApplication {
+    name = "qbittorrent-collector";
+    runtimeInputs = with pkgs; [
+      curl
+      jq
+    ];
+    text = ''
+      QBIT="http://${config.vpnNamespaces.wg.namespaceAddress}:${toString config.services.qbittorrent.webuiPort}"
+      OUT="${textfileDir}/qbittorrent.prom"
+
+      if info=$(curl -sf --max-time 5 "''${QBIT}/api/v2/transfer/info"); then
+        dl=$(echo "$info" | jq '.dl_info_speed')
+        ul=$(echo "$info" | jq '.up_info_speed')
+      else
+        dl=0
+        ul=0
+      fi
+
+      {
+        echo '# HELP qbittorrent_download_bytes_per_second Current download speed in bytes/s'
+        echo '# TYPE qbittorrent_download_bytes_per_second gauge'
+        echo "qbittorrent_download_bytes_per_second $dl"
+        echo '# HELP qbittorrent_upload_bytes_per_second Current upload speed in bytes/s'
+        echo '# TYPE qbittorrent_upload_bytes_per_second gauge'
+        echo "qbittorrent_upload_bytes_per_second $ul"
+      } > "''${OUT}.tmp"
+      mv "''${OUT}.tmp" "$OUT"
+    '';
+  };
+in
+lib.mkIf (config.services.grafana.enable && config.services.qbittorrent.enable) {
+  systemd.services.qbittorrent-collector = {
+    description = "Collect qBittorrent transfer metrics for Prometheus";
+    after = [
+      "network.target"
+      "qbittorrent.service"
+    ];
+    serviceConfig = {
+      Type = "oneshot";
+      ExecStart = lib.getExe qbittorrentCollector;
+    };
+  };
+
+  systemd.timers.qbittorrent-collector = {
+    wantedBy = [ "timers.target" ];
+    timerConfig = {
+      OnCalendar = "*:*:0/15";
+      RandomizedDelaySec = "3s";
+    };
+  };
+}