Docker-RabbitMQ-NestJS microservices error 406 PRECONDITION_FAILED - docker

Question

I'm new to Docker and RabbitMQ and I've been trying for 2 days to solve an error in my docker containers which contains: api_client, api_consumer, RabbitMQ. I've done a research and tried to read as many threads with this problem as I found but unfortunately nothing helped.
So here is my code:
compose.yml
services:
api_client:
build:
context: ""
dockerfile: apps/api_client/Dockerfile
env_file:
- ./config/.env.local
restart: always
ports:
- "3000:3000"
depends_on:
- rabbitmq
api_consumer:
build:
context: ""
dockerfile: apps/api_consumer/Dockerfile
env_file:
- ./config/.env.local
restart: always
depends_on:
- rabbitmq
rabbitmq:
image: rabbitmq:3.9.2-management
container_name: rabbitmq
hostname: rabbitmq
volumes:
- /var/lib/rabbitmq
- ./rabbitmq.conf:/etc/rabbitmq/rabbitmq.conf
ports:
- "5672:5672"
- "15672:15672"
main.ts (in api_consumer)
async function bootstrap() {
const app = await NestFactory.createMicroservice<MicroserviceOptions>(
ApiConsumerModule,
{
transport: Transport.RMQ,
options: {
queue: 'test_queue',
urls: ['amqp://guest:guest#rabbitmq:5672'],
queueOptions: {
durable: true
}
}
},
);
const AWSAppConfig = app.get(AwsAppconfigLoaderService);
const Log = new Logger(ApiClientService.name);
await AWSAppConfig.loadAWSAppConfig()
.then((_) => {
Log.log(AWSAppConfig.getAppName());
})
.catch((err) => {
Log.error(
`Error occured while downloading AWS Config: ${JSON.stringify(
err,
)}`,
);
});
await app.listen();
}
bootstrap();
api-client.module.ts (in api_client)
#Module({
imports: [
ConfigModule.forRoot({
isGlobal: true,
load: [AppConfig],
}),
ClientsModule.register([{
name: GET_MATCHED_DEVICES,
transport: Transport.RMQ,
options: {
queue: 'test_queue',
urls: ['amqp://guest:guest#rabbitmq:5672'],
queueOptions: {
durable: true
}
}
},
]),
AwsAppconfigLoaderModule,
],
controllers: [ApiClientController],
providers: [ApiClientService],
})
export class ApiClientModule {}
Functionality is simple- when GET on localhost:3000 (api_client) is called, it calls (in controller) return this.client.send('getSample', "hello") and then in api_consumer it should call (in controller)
#MessagePattern('getSample')
getSample(data): string {
Logger.debug(data)
return "It works!";
}
When all docker services start there is the first error:
Disconnected from RMQ. Trying to reconnect.
{
"err": {
"code": 406,
"classId": 60,
"methodId": 40
}
}
And then when I try to access the localhost:3000, this error always occur:
Error: Channel closed by server: 406 (PRECONDITION-FAILED) with message "PRECONDITION_FAILED - fast reply consumer does not exist"
Both errors come from api_client.
What I've tried and didn't help:
-change durable to false or remove durable options completely
-add noAck
-remove queue in adminer on localhost:15672 (which works fine)
-remove port from urls in both microservices
-as you can see the queue options are the same in both microservices
Now the most absurd thing is that this code did work absolutely fine until I started to work on second compose file (and dockerfiles) for local (faster) development with volumes. Then suddenly these errors have started to occur and even if I undid all my code changes the errors are still there. Because of this I've wiped all my volumes (with docker system prune -a --volumes) many times but still nothing. My OS is Ubuntu 20.04
I am completely out of ideas so I've written it here in hope for some help, please.

Answer 1

The failure occurs because the app can not connect to rabbitmq, the problem resides in your docker compose. Make sure the services are using the same network in docker and are able to communicate.

Answer 2

I know it sounds strange but I have had the same problem yesterday, also using a docker-compose file and without making any changes to it or to the rabbitmq logic, it broke. I tried many things, and when i changed
return this.client.send('getSample', "hello") and #MessagePattern
to
return this.client.emit('getSample', "hello") and #EventPattern
thinking it wouldn't make sense for it to fix the issue, it actually did.
I suggest you try that and tell me if it works, sorry if i can't help you more.

Answer 3

So after 5 days of figuring out what causes the error I've found out the problem lies in Nest itself. The bug has been documented here. I've deleted all the code associated with #nestjs/microservices and tried to use this approach using amqlib only and the request/response functionality finally works.