feature(microservices): add clients module (factory abstraction)

Author: kamilmysliwiec

packages/microservices/index.ts

@@ -11,5 +11,6 @@ export * from './decorators';
 export * from './enums';
 export * from './exceptions';
 export * from './interfaces';
+export * from './module';
 export * from './nest-microservice';
 export * from './server';

packages/microservices/module/clients.decorators.ts

@@ -0,0 +1,3 @@
+import { getClientToken } from './clients.utils';
+
+export const InjectClient = (name: string) => getClientToken(name);

packages/microservices/module/clients.module.ts

@@ -0,0 +1,19 @@
+import { DynamicModule, Module } from '@nestjs/common';
+import { ClientProxyFactory } from 'client';
+import { getClientToken } from './clients.utils';
+import { ClientsModuleOptions } from './interfaces/clients-module.interface';
+
+@Module({})
+export class ClientsModule {
+  static register(options: ClientsModuleOptions): DynamicModule {
+    const clients = (options || []).map(item => ({
+      provide: getClientToken(item.name),
+      useValue: ClientProxyFactory.create(item.options),
+    }));
+    return {
+      module: ClientsModule,
+      providers: clients,
+      exports: clients,
+    };
+  }
+}

packages/microservices/module/clients.utils.ts

@@ -0,0 +1 @@
+export const getClientToken = (name: string) => `${name.toUpperCase()}_CLIENT`;

packages/microservices/module/index.ts

@@ -0,0 +1,3 @@
+export * from './clients.decorators';
+export * from './clients.module';
+export * from './clients.utils';

packages/microservices/module/interfaces/clients-module.interface.ts

@@ -0,0 +1,8 @@
+import { ClientOptions } from '../../interfaces';
+
+export interface ClientProviderOptions {
+  name: string;
+  options: ClientOptions;
+}
+
+export interface ClientsModuleOptions extends Array<ClientProviderOptions> {}