how to create NestJs grpc client - node.js

Question

am trying to create a NestJs gRPC client on docker env, but i always get this error when compiling
[Nest] 1076 - 2020-05-19 23:59:34 [ClientProxy] The invalid gRPC package (package not found)
Error: The invalid gRPC package (package not found)
at ClientGrpcProxy.createClients (/app/node_modules/#nestjs/microservices/client/client-grpc.js:188:45)
at new ClientGrpcProxy (/app/node_modules/#nestjs/microservices/client/client-grpc.js:26:33)
at Function.create (/app/node_modules/#nestjs/microservices/client/client-proxy-factory.js:22:24)
at clients.map.item (/app/node_modules/#nestjs/microservices/module/clients.module.js:11:51)
at Array.map (<anonymous>)
at Function.register (/app/node_modules/#nestjs/microservices/module/clients.module.js:9:41)
at Object.<anonymous> (/app/dist/src/modules/orders/orders.module.js:31:43)
at Module._compile (module.js:653:30)
at Object.Module._extensions..js (module.js:664:10)
at Module.load (module.js:566:32)
/app/node_modules/#nestjs/microservices/client/client-grpc.js:190
throw invalidPackageError;
^
Error: The invalid gRPC package (package not found)
at ClientGrpcProxy.createClients (/app/node_modules/#nestjs/microservices/client/client-grpc.js:188:45)
at new ClientGrpcProxy (/app/node_modules/#nestjs/microservices/client/client-grpc.js:26:33)
at Function.create (/app/node_modules/#nestjs/microservices/client/client-proxy-factory.js:22:24)
at clients.map.item (/app/node_modules/#nestjs/microservices/module/clients.module.js:11:51)
at Array.map (<anonymous>)
at Function.register (/app/node_modules/#nestjs/microservices/module/clients.module.js:9:41)
at Object.<anonymous> (/app/dist/src/modules/orders/orders.module.js:31:43)
at Module._compile (module.js:653:30)
at Object.Module._extensions..js (module.js:664:10)
at Module.load (module.js:566:32)
i have already tried reinstalling the packages (gRPC, #grpc/proto-loader and #nestjs/microservices),
I get this problem when trying with both methods provided in docs
First Method with #Client decorator
#Client({
transport: Transport.GRPC,
options: {
package: 'app',
protoPath: join(__dirname, '../../../../../../src/modules/orders/proto/app.proto'),
},
})
private client : ClientGrpc
private grpcService: IGrpcService;
onModuleInit(){
this.grpcService= this.client.getService<IGrpcService>('AppController')
}
Second Method using ClientModule in appmodule.ts
ClientsModule.register([{
name:'TEST',
transport: Transport.GRPC,
options: {
package: 'app',
protoPath: join(__dirname, '../../../../src/modules/orders/proto/app.proto'),
},
}])
Proto file
syntax = "proto3";
package role;
service RoleService {
rpc CheckPermission (StringMessage) returns (BooleanPayload) {}
rpc AddPolicy (StringMessage) returns (BooleanPayload) {}
}
message StringMessage {
repeated string params = 1;
}
message Role {
string id = 1;
string codeName = 2;
string label = 3;
string createdAt = 4;
string updatedAt = 5;
}
message BooleanPayload {
bool success = 1;
}

Answer 1

I have fixed it, the problem was with my proto file Package and service, i've changed it to the name of the controller in using it in.

Answer 2

Follow question at here. Found a sample
Nest gGPC server: https://github.com/chj-damon/nestjs-grpc-server
Nest gGPC client: https://github.com/chj-damon/nestjs-grpc-client
Also, see more at a document gRPC client
Proto file:
syntax = "proto3";
package hero;
service HeroService {
rpc FindOne (HeroById) returns (Hero) {}
}
message HeroById {
int32 id = 1;
}
message Hero {
int32 id = 1;
string name = 2;
}
Controller:
import { Controller, OnModuleInit, Get, Param } from '#nestjs/common';
import {
GrpcMethod,
ClientGrpc,
Client,
Transport,
} from '#nestjs/microservices';
import { HeroById } from './interfaces/hero-by-id.interface';
import { Hero } from './interfaces/hero.interface';
import { Observable } from 'rxjs';
import { join } from 'path';
import { grpcClientOptions } from '../grpc-hero.options';
interface HeroService {
findOne(data: { id: number }): Observable<any>;
}
#Controller('hero')
export class HeroController implements OnModuleInit {
#Client(grpcClientOptions) private readonly client: ClientGrpc;
private heroService: HeroService;
onModuleInit() {
this.heroService = this.client.getService<HeroService>('HeroService');
}
#Get(':id')
call(#Param() params): Observable<any> {
return this.heroService.findOne({ id: +params.id });
}
}