nest-queue

Queue manager for NestJS applications

Easy for use and installation into you'r projects.

yarn add nest-queue

Make sure you have installed redis on your host. For local development you can easily install it using docker.

For better working you need to use nest package with 6.. ver.
#### How to

1) Add new module in your app.module.ts file:

This module (QueueModule) marked as global.

``typescript
import { Module } from '@nestjs/common';
import { QueueModule } from 'nest-queue';

@Module({
imports: [
QueueModule.forRoot({}),
]
})
export class AppModule {}
`

For first parameter forRoot function accept options for current module.
Settings very simply and have this structure:

`typescript
export interface QueueModuleOptions {
name?: string,
connection?: Bull.QueueOptions,
}
`

For connection settings you can take help from Bull documentation.
By default connection setting is:
`
connection: {
redis: {
port: 6379,
}
}
`

It means we will work with localhost:6379 host.

2) Add queue and handle events

For add job to queue u need inject a Queue instance into your service or controller.
For example:

`typescript
import { Controller, Get } from '@nestjs/common'
import { Queue } from 'bull';
import { QueueInjection } from 'nest-queue';

@Controller('test')
class TestController {
constructor(
@QueueInjection() private readonly queue: Queue,
) {}

@Get('/')
index() {
this.queue.add('testEvent', { data: 1, somedata: 2 });
}
}
`

In this case you can manipulate with job adding. You can add delayed call and etc.
Information about it you can take from Bull documentation.

Anywhere (controllers, services) in your project you can provide event handler for redis calls.
@EventConsumer(eventName) method decorator allows you to work with it. For example:

`typescript
import { Job, DoneCallback } from 'bull';
import { EventConsumer } from 'nest-queue';

class TestService {
@EventConsumer('testEvent')
eventHandler(job: Job, done: DoneCallback) {
// job.data has passed data from queue adding
done(); // required call to stop job
}
}
`

Context (this) in this function equals to TestService prototype with all resolved dependencies

Function that will provide as event handler receive two arguments Job and DoneCallback.
This function calls as bull-processors and you can take help about from bull Bull documentation.

#### Future Goals

* Add tests;
* Async module adding;
* Workaround with bull and provide once module for manipulating with jobs;
* Add console commands lika a queue list` and etc for receiving information about
all processing jobs and allow to restart failed jobs (like a Laravel artisan queue manager).

#### Contributors

* Maxim Markin