merge refactor/v2

lib/services/metadata-accessor.service.ts

@@ -0,0 +1,36 @@
+import { Injectable } from '@nestjs/common';
+import { Reflector } from '@nestjs/core';
+import {
+  SCENE_METADATA,
+  UPDATE_LISTENER_METADATA,
+  UPDATE_METADATA,
+} from '../telegraf.constants';
+import { ListenerMetadata } from '../interfaces';
+
+@Injectable()
+export class MetadataAccessorService {
+  constructor(private readonly reflector: Reflector) {}
+
+  isUpdate(target: Function): boolean {
+    // TODO: We really need this check?
+    if (!target) {
+      return false;
+    }
+    return !!this.reflector.get(UPDATE_METADATA, target);
+  }
+
+  isScene(target: Function): boolean {
+    if (!target) {
+      return false;
+    }
+    return !!this.reflector.get(SCENE_METADATA, target);
+  }
+
+  getListenerMetadata(target: Function): ListenerMetadata | undefined {
+    return this.reflector.get(UPDATE_LISTENER_METADATA, target);
+  }
+
+  getSceneMetadata(target: Function): string | undefined {
+    return this.reflector.get(SCENE_METADATA, target);
+  }
+}