feat: systemd management (#532)

lib/data/model/server/systemd.dart

@@ -0,0 +1,118 @@
+import 'package:fl_lib/fl_lib.dart';
+import 'package:flutter/material.dart';
+
+enum SystemdUnitFunc {
+  start,
+  stop,
+  restart,
+  reload,
+  enable,
+  disable,
+  status,
+  ;
+
+  IconData get icon => switch (this) {
+        start => Icons.play_arrow,
+        stop => Icons.stop,
+        restart => Icons.refresh,
+        reload => Icons.refresh,
+        enable => Icons.check,
+        disable => Icons.close,
+        status => Icons.info,
+      };
+}
+
+enum SystemdUnitType {
+  service,
+  socket,
+  mount,
+  timer,
+  ;
+
+  static SystemdUnitType? fromString(String? value) {
+    return values.firstWhereOrNull((e) => e.name == value?.toLowerCase());
+  }
+}
+
+enum SystemdUnitScope {
+  system,
+  user,
+  ;
+
+  Color? get color => switch (this) {
+        system => Colors.red,
+        _ => null,
+      };
+
+  String getCmdPrefix(bool isRoot) {
+    if (this == system) {
+      return isRoot ? 'systemctl' : 'sudo systemctl';
+    }
+    return 'systemctl --user';
+  }
+}
+
+enum SystemdUnitState {
+  active,
+  inactive,
+  failed,
+  activating,
+  deactivating,
+  ;
+
+  static SystemdUnitState? fromString(String? value) {
+    return values.firstWhereOrNull((e) => e.name == value?.toLowerCase());
+  }
+
+  Color? get color => switch (this) {
+        failed => Colors.red,
+        _ => null,
+      };
+}
+
+final class SystemdUnit {
+  final String name;
+  final String? description;
+  final SystemdUnitType type;
+  final SystemdUnitScope scope;
+  final SystemdUnitState state;
+
+  SystemdUnit({
+    required this.name,
+    this.description,
+    required this.type,
+    required this.scope,
+    required this.state,
+  });
+
+  String getCmd({
+    required SystemdUnitFunc func,
+    required bool isRoot,
+  }) {
+    final prefix = scope.getCmdPrefix(isRoot);
+    return '$prefix ${func.name} $name';
+  }
+
+  List<SystemdUnitFunc> get availableFuncs {
+    final funcs = <SystemdUnitFunc>{};
+    switch (state) {
+      case SystemdUnitState.active:
+        funcs.addAll([SystemdUnitFunc.stop, SystemdUnitFunc.restart]);
+        break;
+      case SystemdUnitState.inactive:
+        funcs.addAll([SystemdUnitFunc.start]);
+        break;
+      case SystemdUnitState.failed:
+        funcs.addAll([SystemdUnitFunc.restart]);
+        break;
+      case SystemdUnitState.activating:
+        funcs.addAll([SystemdUnitFunc.stop]);
+        break;
+      case SystemdUnitState.deactivating:
+        funcs.addAll([SystemdUnitFunc.start]);
+        break;
+    }
+    funcs.addAll([SystemdUnitFunc.status]);
+    return funcs.toList();
+  }
+}