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@autotelic/fastify-queue

v0.2.0

Published

an async queue for fastify

Downloads

97

Readme

fastify-queue

An async queue for Fastify.

Usage

npm i @autotelic/fastify-queue

Example

const fastifyQueue = require('@autotelic/fastify-queue')

function myRoute (fastify, opts) {
  fastify.register(fastifyQueue)

  fastify.post('/example', async (request, reply) => {
    reply.queue.add('async-action-one', reply.asyncAction())
    reply.queue.add('async-action-two', reply.asyncActionTwo())
    reply.queue.add('async-action-three', reply.asyncActionThree())
    // Manual resolution optional - queue will otherwise resolve in onResponse hook.
    const results = await reply.queue.resolve()
    reply.status(200)
  })
}

API

Plugin opts

fastify-queue accepts the following optional configuration:

  • initializer: (key: string, value: any, reply: FastifyReply) => any | Promise<any>

    • Called each time an item is added to the queue. The value returned will be the value added to the queue.
  • resolver: (key: string, value: any, reply: FastifyReply) => any

    • Called each time an item in the queue is resolved. value is the resolved value of an item in the queue.
  • onError: (error: Error, reply: FastifyReply) => any

    • Called if an error occurs while resolving the queue. Defaults to fastify.log.error(error).
  • onResolved: (result: any, reply: FastifyReply) => void

    • Called after the queue has successfully resolved. result is the resolved queue.
  • queueName: string

    • Determines the name of the reply decorator added by the plugin. Defaults to 'queue'.
  • concurrency: number

    • Max number of concurrently pending promises. Defaults to Infinity.
    • This value is passed directly to p-props options param.
  • stopOnError: boolean

    • When set to false, errors thrown while resolving items in the queue will be accumulated. Once all items in the queue have settled, a single aggregated error will be thrown.
    • This value is passed directly to p-props options param.

Reply Decorator

fastify-queue adds a queue (or the value of opts.queueName) reply decorator containing the following properties:

  • add: (key: string, value: any) => void

    • Used to add items to the queue.
  • resolve: (cb?: (result: any, reply: FastifyReply) => void) => void

    • Used to manually resolve the queue. cb defaults to opts.onResolved.
    • fastify-queue will automatically resolve the queue in an onResponse hook, if this has not already been called.
  • contents: Map

    • The queue Map instance.