another refactor partly done

modules/homelab/lib/features/logging.nix

@@ -0,0 +1,87 @@
+serviceName: {
+  config,
+  lib,
+  ...
+}:
+with lib; let
+  cfg = config.homelab.services.${serviceName};
+  homelabCfg = config.homelab;
+in {
+  options.homelab.services.${serviceName}.logging = {
+    enable = mkEnableOption "logging for ${serviceName}";
+
+    files = mkOption {
+      type = types.listOf types.str;
+      default = [];
+    };
+
+    parsing = {
+      regex = mkOption {
+        type = types.nullOr types.str;
+        default = null;
+      };
+
+      extractFields = mkOption {
+        type = types.listOf types.str;
+        default = [];
+      };
+    };
+
+    multiline = mkOption {
+      type = types.nullOr (types.submodule {
+        options = {
+          firstLineRegex = mkOption {type = types.str;};
+          maxWaitTime = mkOption {
+            type = types.str;
+            default = "3s";
+          };
+        };
+      });
+      default = null;
+    };
+
+    extraLabels = mkOption {
+      type = types.attrsOf types.str;
+      default = {};
+    };
+
+    extraSources = mkOption {
+      type = types.listOf types.attrs;
+      default = [];
+    };
+  };
+
+  config = mkIf (cfg.enable && cfg.logging.enable) {
+    homelab.logging.sources =
+      [
+        {
+          name = "${serviceName}-logs";
+          type = "file";
+          files = {
+            paths = cfg.logging.files;
+            multiline = cfg.logging.multiline;
+          };
+          labels =
+            cfg.logging.extraLabels
+            // {
+              service = serviceName;
+              node = homelabCfg.hostname;
+              environment = homelabCfg.environment;
+            };
+          pipelineStages =
+            mkIf (cfg.logging.parsing.regex != null) [
+              {
+                regex.expression = cfg.logging.parsing.regex;
+              }
+            ]
+            ++ [
+              {
+                labels = listToAttrs (map (field: nameValuePair field null) cfg.logging.parsing.extractFields);
+              }
+            ];
+          enabled = true;
+        }
+      ]
+      ++ cfg.logging.extraSources;
+  };
+}