feat: centralize grpc client registration

lib/grpc/factory/grpc-client.factory.ts

@@ -0,0 +1,36 @@
+import { Injectable } from '@nestjs/common'
+import {
+	ClientGrpc,
+	ClientProxyFactory,
+	Transport
+} from '@nestjs/microservices'
+
+@Injectable()
+export class GrpcClientFactory {
+	private clients = new Map<string, ClientGrpc>()
+
+	public createClient(options: {
+		package: string
+		protoPath: string
+		url: string
+	}) {
+		return ClientProxyFactory.create({
+			transport: Transport.GRPC,
+			options
+		}) as ClientGrpc
+	}
+
+	public register(token: string, client: ClientGrpc) {
+		this.clients.set(token, client)
+	}
+
+	public getClient<T extends ClientGrpc = ClientGrpc>(token: string): T {
+		const client = this.clients.get(token)
+
+		if (!client) {
+			throw new Error(`gRPC client with token ${token} not found`)
+		}
+
+		return client as T
+	}
+}