@node-ts/bus-redis

@node-ts/bus-redis

A redis transport adapter for @node-ts/bus.

Installation

Install all packages and their dependencies

npm i reflect-metadata inversify @node-ts/bus-redis @node-ts/bus-core

Once installed, load the BusRedisModule to your inversify container alongside the other modules it depends on:

import { Container } from 'inversify'
import { LoggerModule } from '@node-ts/logger-core'
import { BusModule } from '@node-ts/bus-core'
import { BUS_REDIS_SYMBOLS, BusRedisModule, RedisTransportConfiguration } from '@node-ts/bus-redis'

const container = new Container()
container.load(new LoggerModule())
container.load(new BusModule())
container.load(new BusRedisModule())

const redisConfiguration: RedisTransportConfiguration = {
  queueName: 'accounts-application-queue',
  connectionString: 'redis://127.0.0.1:6379',
  maxRetries: 3,

}
container.bind(BUS_REDIS_SYMBOLS.TransportConfiguration).toConstantValue(redisConfiguration)

Configuration Options

The Redis transport has the following configuration:

• queueName (required) The name of the service queue to create and read messages from.
• connectionString (required) A redis formatted connection string that's used to connect to the Redis instance
• maxRetries (optional) The number of attempts to retry failed messages before they're routed to the dead letter queue. Default: 10
• visibilityTimeout (optional) The time taken before a message has been deemed to have failed or stalled. Once this time has been exceeded the message will be re-added to queue. Default: 30000
• subscriptionsKeyPrefix (optional) Different queues may want to be aware of the same event being sent on the bus. We need to store a set of queue names that are interested in events being published on the bus and where better than redis at a certain key. Default: 'node-ts:bus-redis:subscriptions:'

Development

Local development can be done with the aid of docker to run the required infrastructure. To do so, run:

docker run --name redis -e ALLOW_EMPTY_PASSWORD=yes -p 6379:6379 bitnami/redis