NATS microservice and client not reconnecting

Bug Report

Current behavior

If a microservice app or client can’t connect to NATS server, or disconnects after connected, it throws an error but never tries to reconnect.

Input Code

const app = await NestFactory.createMicroservice<MicroserviceOptions>(AppModule, {
    transport: Transport.NATS,
    options:   {
      url:   'nats://localhost:4222',
      maxReconnectAttempts: -1,
    },
  });

Expected behavior

It should reconnect according to the connect options which sets maxReconnectAttempts and reconnectTimeWait.

Further things

• The app never starts if there is no connection, instead it should retry until connected and then continue to start
• If connection is lost after initially connected, ClientProxy.send() throws an error on first call, but then does not throw an error anymore. It shows an log in console “NatsError: Connection closed” but does not throw an error.
• I dont see any hooks for logging. E.g. when the connection is lost I want to log an error and when the connection is back I want to log that, too. -> EDIT: Hooks are there but not accessible, see #6692

Environment

Nest version: 8.0.0-alpha.3
 
For Tooling issues:
- Node version: 15.6.0
- Platform:  macOS Big Sur

[kamilmysliwiec]

Thanks @ceoro9! Let’s track this here https://github.com/nestjs/nest/pull/6696

[MickL]

Thanks for all your afforts!