fix(@nestjs/core, @nestjs/common) pass server to listen method, add configuration class, multiple servers, global route prefix (nestjs#70, nestjs#20, nestjs#40)

Author: kamil.mysliwiec

example/server.ts

@@ -4,7 +4,9 @@ import { ApplicationModule } from './modules/app.module';
 const port = 3001;
 const app = NestFactory.create(ApplicationModule);
 
-app.listen(port, () => {
+app.init();
+app.listen(port, (server) => {
     console.log('Application listen on port:', port);
+    server.close();
     process.exit();
 });

src/common/interfaces/nest-application.interface.ts

@@ -1,3 +1,5 @@
 export interface INestApplication {
-    listen(port: number, callback?: () => void);
+    init(): void;
+    listen(port: number, callback?: (server?) => void): void;
+    setGlobalPrefix(prefix: string): void;
 }

src/core/application-config.ts

@@ -0,0 +1,11 @@
+export class ApplicationConfig {
+    private globalPrefix = '';
+
+    public setGlobalPrefix(prefix: string) {
+        this.globalPrefix = prefix;
+    }
+
+    public getGlobalPrefix() {
+        return this.globalPrefix;
+    }
+}

src/core/nest-application.ts

@@ -8,10 +8,13 @@ import { messages } from './constants';
 import { MicroservicesModule } from '@nestjs/microservices/microservices-module';
 import { Resolver } from './router/interfaces/resolver.interface';
 import { INestApplication } from '@nestjs/common';
+import { ApplicationConfig } from './application-config';
+import { validatePath } from '@nestjs/common/utils/shared.utils';
 
 export class NestApplication implements INestApplication {
-    private readonly routesResolver: Resolver;
+    private readonly config = new ApplicationConfig();
     private readonly logger = new Logger(NestApplication.name);
+    private readonly routesResolver: Resolver;
 
     constructor(
         private readonly container: NestContainer,
@@ -26,12 +29,27 @@ export class NestApplication implements INestApplication {
         MicroservicesModule.setupClients(this.container);
     }
 
-    public listen(port: number, callback?: () => void) {
-        this.setupMiddlewares(this.express);
-        this.setupRoutes(this.express);
+    public init() {
+        const router = ExpressAdapter.createRouter();
+        this.setupMiddlewares(router);
+        this.setupRoutes(router);
+
+        this.express.use(
+            validatePath(this.config.getGlobalPrefix()),
+            router,
+        );
 
         this.logger.log(messages.APPLICATION_READY);
-        return this.express.listen(port, callback);
+    }
+
+    public listen(port: number, callback?: () => void) {
+        const server = this.express.listen(port, () => {
+            callback && callback.call(callback, server);
+        });
+    }
+
+    public setGlobalPrefix(prefix: string) {
+        this.config.setGlobalPrefix(prefix);
     }
 
     private setupMiddlewares(instance) {