feat(server): job system (#10134)

packages/backend/server/src/base/nestjs/index.ts

@@ -2,3 +2,4 @@ import './config';
 export * from './decorator';
 export * from './exception';
 export * from './optional-module';
+export * from './scanner';

packages/backend/server/src/base/nestjs/scanner.ts

@@ -0,0 +1,60 @@
+import { Global, Injectable, Module } from '@nestjs/common';
+import {
+  DiscoveryModule,
+  DiscoveryService,
+  MetadataScanner,
+} from '@nestjs/core';
+import { RESOLVER_TYPE_METADATA } from '@nestjs/graphql';
+
+@Injectable()
+export class ModuleScanner {
+  constructor(
+    private readonly discovery: DiscoveryService,
+    private readonly scanner: MetadataScanner
+  ) {}
+
+  getClassProviders() {
+    return this.discovery
+      .getProviders()
+      .filter(
+        wrapper =>
+          wrapper.instance && !wrapper.isAlias && !wrapper.isNotMetatype
+      );
+  }
+
+  getAtInjectables() {
+    return this.getClassProviders().filter(
+      wrapper => !this.isResolver(wrapper.instance)
+    );
+  }
+
+  getControllers() {
+    return this.discovery.getControllers();
+  }
+
+  getResolvers() {
+    return this.getClassProviders().filter(wrapper =>
+      this.isResolver(wrapper.instance)
+    );
+  }
+
+  getAllMethodNames(instance: any) {
+    return this.scanner.getAllMethodNames(Object.getPrototypeOf(instance));
+  }
+
+  isResolver(instance: any) {
+    if (typeof instance !== 'object') {
+      return false;
+    }
+    const metadata = Reflect.getMetadata(RESOLVER_TYPE_METADATA, instance);
+    return metadata !== undefined;
+  }
+}
+
+@Global()
+@Module({
+  imports: [DiscoveryModule],
+  providers: [ModuleScanner],
+  exports: [ModuleScanner],
+})
+export class ScannerModule {}