Nest: [gRPC] TypeError: Cannot read property 'service' of null

[VincentSurelle]

Hi everyone ;)

I'm submitting a...

[ ] Regression 
[x] Bug report
[ ] Feature request
[ ] Documentation issue or request
[ ] Support request => Please do not submit support request here, instead post your question on Stack Overflow.

Current behavior

On gRPC microservice startup, Unhandled exception is thrown :

[nodemon] starting `ts-node -r tsconfig-paths/register src/main.ts`
[Nest] 44151   - 1/24/2019, 5:05:24 PM   [NestFactory] Starting Nest application...
[Nest] 44151   - 1/24/2019, 5:05:24 PM   [InstanceLoader] CustomersModule dependencies initialized +0ms
[Nest] 44151   - 1/24/2019, 5:05:24 PM   [InstanceLoader] AppModule dependencies initialized +1ms
[Nest] 44151   - 1/24/2019, 5:05:24 PM   [NestMicroservice] Nest microservice successfully started +194ms
(node:44151) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'service' of null
    at ServerGrpc.collectDeepServices (/Users/vincent/Workspace/customers-dal/node_modules/@nestjs/microservices/server/server-grpc.js:195:24)
    at ServerGrpc.collectDeepServices (/Users/vincent/Workspace/customers-dal/node_modules/@nestjs/microservices/server/server-grpc.js:208:14)
    at ServerGrpc.collectDeepServices (/Users/vincent/Workspace/customers-dal/node_modules/@nestjs/microservices/server/server-grpc.js:208:14)
    at ServerGrpc.collectDeepServices (/Users/vincent/Workspace/customers-dal/node_modules/@nestjs/microservices/server/server-grpc.js:208:14)
    at ServerGrpc.collectDeepServices (/Users/vincent/Workspace/customers-dal/node_modules/@nestjs/microservices/server/server-grpc.js:208:14)
    at ServerGrpc.getServiceNames (/Users/vincent/Workspace/customers-dal/node_modules/@nestjs/microservices/server/server-grpc.js:62:10)
    at ServerGrpc.bindEvents (/Users/vincent/Workspace/customers-dal/node_modules/@nestjs/microservices/server/server-grpc.js:44:35)
    at ServerGrpc.start (/Users/vincent/Workspace/customers-dal/node_modules/@nestjs/microservices/server/server-grpc.js:29:16)
    at ServerGrpc.listen (/Users/vincent/Workspace/customers-dal/node_modules/@nestjs/microservices/server/server-grpc.js:26:16)
    at NestMicroservice.listen (/Users/vincent/Workspace/customers-dal/node_modules/@nestjs/microservices/nest-microservice.js:81:21)
(node:44151) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 2)
(node:44151) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
[nodemon] clean exit - waiting for changes before restart

Expected behavior

Normal startup ? 😄

Minimal reproduction of the problem with instructions

Here is my main.ts :

import { NestFactory } from '@nestjs/core';
import { AppModule } from './app.module';
import { Transport } from '@nestjs/common/enums/transport.enum';
import { join } from 'path';

async function bootstrap() {
  const app = await NestFactory.createMicroservice(AppModule, {
    transport: Transport.GRPC,
    options: {
      package: 'customers',
      protoPath: join(__dirname, './proto/customers.proto'),
    },
  });
  await app.listenAsync();
}
bootstrap();

And here is my .proto file :

syntax = "proto3";

package customers;

import "google/protobuf/empty.proto";

service CustomersService {
  rpc AddOne (Customer) returns (Customer) {}
  rpc GetOne (CustomerById) returns (Customer) {}
  rpc GetAll (google.protobuf.Empty)  returns (Customers) {}
  rpc UpdateOne (Customer) returns (Customer) {}
  rpc DeleteOne (CustomerById) returns (CustomerById) {}
}

message Address {
  string addressLine1 = 1;
  string addressLine2 = 2;
  string addressLine3 = 3;
  string addressLine4 = 4;
  string zipcode = 5;
  string city = 6;
  string state = 7;
  string country = 8;
}

message Customer {
  int32 id = 1;
  string name = 2;
  string email = 3;
  string phone = 4;
  string website = 5;
  string number = 6;
  Address address = 8;
  string logo = 12;
  string banner = 13;
}

message CustomerById {
  int32 id = 1;
}

message Customers {
  repeated Customer customers = 1;
}

Apparently, the problem come from this line (server-grpc.js) :

const isServiceDefined = !shared_utils_1.isUndefined(deepDefinition.service);

I tried to console.log some thing to help debugging :

key: options
deepDefinition: null
nameExtended: Address.type.field.0.options

What is the motivation / use case for changing the behavior?

Environment

 "@nestjs/common": "^5.4.0",
 "@nestjs/core": "^5.4.0",
 "@nestjs/microservices": "^5.6.2",
For Tooling issues:
- Node version: 11.7.0
- Platform:  Mac

Others:
"@grpc/proto-loader": "^0.4.0",
"grpc": "^1.18.0",

Thanks for any help provided :)

[VincentSurelle]

It works with "@grpc/proto-loader": "^0.3.0"

[kmturley]

Equally if you take the sample project:
https://github.com/nestjs/nest/tree/master/sample/04-grpc

It has errors when running:

[Nest] 62903   - 2019-1-26 17:43:57   [Server] grpcPackage.loadPackageDefinition is not a function +14ms
Error: The invalid .proto definition (file not found)

If you upgrade all the packages to latest versions:

{
  "name": "nest-typescript-starter",
  "version": "1.0.0",
  "description": "Nest TypeScript starter repository",
  "license": "MIT",
  "scripts": {
    "start": "ts-node src/main.ts",
    "prestart:prod": "tsc",
    "start:prod": "node dist/main.js"
  },
  "dependencies": {
    "@grpc/proto-loader": "^0.4.0",
    "@nestjs/common": "^5.3.7",
    "@nestjs/core": "^5.3.7",
    "@nestjs/microservices": "^5.3.7",
    "@nestjs/testing": "^5.3.7",
    "@nestjs/websockets": "^5.3.7",
    "class-transformer": "^0.1.7",
    "class-validator": "^0.7.2",
    "grpc": "^1.10.0",
    "reflect-metadata": "^0.1.12",
    "rxjs": "^6.1.0",
    "typescript": "^2.8.0"
  },
  "devDependencies": {
    "@types/node": "^7.0.41",
    "ts-node": "^6.0.0",
    "tslint": "^5.9.1"
  }
}

you get the same error:
(node:44151) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'service' of null

but downgrading proto-loader worked:
npm install @grpc/[email protected]

[kamilmysliwiec]

Fixed in 5.7.0

[lock[bot]]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.