@nasimhuq/abort-promise-queue

abort-promise-queue

Queue of promises. All promises are executed concurrently as they are added to the input queue. Regardless of which promise resolved earlier, output queue will always keep the order it was executed

Output queue returns an object { config, data, error }

• On successful response, data will contain the response body.
• On error response, error will contain the error message.

Install

npm install --save @nasimhuq/abort-promise-queue

Typical usage

Require as CJS

const abortPromiseQueue = require('@nasimhuq/abort-promise-queue');

Import as ES6 Module

import abortPromiseQueue from '@nasimhuq/abort-promise-queue';

Examples

Example 1: Single batch of requests

import abortPromiseQueue from '@nasimhuq/abort-promise-queue'

const api = (url, config) => {
    return new Promise((resolve, reject) => {
        setTimeout(() => {
            if (config.reject) {
                reject(config)
            } else {
                resolve(config)
            }
        }, config.duration)
    })
}

const multi = 1000

const reqConfigList = [
    {
        url: 'First.com',
        config: {
            key: 'First',
            duration: 1000 + multi,
        },
    },
    {
        url: 'Second.com',
        config: {
            key: 'Second',
            duration: 500 + multi,
        },
    },
    {
        url: 'Third.com',
        config: {
            key: 'Third',
            duration: 1300,
            reject: true,
        },
    },
    {
        url: 'Fourth.com',
        config: {
            key: 'Fourth',
            duration: 1300 + multi * 2,
            reject: true,
        },
    },
    {
        url: 'Fifth.com',
        config: {
            key: 'Fifth',
            duration: 1000 + multi * 3,
            reject: true,
        },
    },
    {
        url: 'Sixth.com',
        config: {
            key: 'Sixth',
            duration: 900 + multi,
        },
    },
    {
        url: 'Seventh.com',
        config: {
            key: 'Seventh',
            duration: 700 + multi,
        },
    },
]

const test_abort_queue = async (resolve) => {
    const { inputQueue, outputQueue, abortQueue } = abortPromiseQueue(api)
    reqConfigList.forEach((config) => {
        inputQueue.next(config)
    })
    const start = Date.now()
    try {
        for await (const res of outputQueue) {
            console.log(res)
            if (res.error) {
                abortQueue()
            }
            const end = Date.now()
            console.log('duration: ', end - start)
        }
    } catch (e) {
        console.log('something went wrong!', e)
    }
    console.log('finished')
    resolve() // this resolve is used for display purpose only
}

const test_single_batch = async (resolve) => {
    const { inputQueue, outputQueue } = abortPromiseQueue(api)
    reqConfigList.forEach((config) => {
        inputQueue.next(config)
    })
    const start = Date.now()
    try {
        for await (const res of outputQueue) {
            console.log(res)
            const end = Date.now()
            console.log('duration: ', end - start)
        }
    } catch (e) {
        console.log('something went wrong!')
    }
    console.log('finished')
    resolve() // this resolve is used for display purpose only
}



const test_multiple_batches = async (resolve) => {
    const { inputQueue, outputQueue, closeQueue } = abortPromiseQueue(
        api,
        true,
        500
    )
    inputQueue.next(reqConfigList[0])
    inputQueue.next(reqConfigList[1])
    inputQueue.next(reqConfigList[2])

    const start = Date.now()
    setTimeout(() => {
        console.log('new Batch:', Date.now() - start)
        inputQueue.next(reqConfigList[3])
        inputQueue.next(reqConfigList[4])
        inputQueue.next(reqConfigList[5])
        inputQueue.next(reqConfigList[6])
    }, 3000)

    setTimeout(() => {
        closeQueue() // no more adding new fetch config to inputQueue after this call.
    }, 5000)

    try {
        for await (const res of outputQueue) {
            console.log(res)
            const end = Date.now()
            console.log('duration: ', end - start)
        }
    } catch (e) {
        console.log('something went wrong!')
    }
    console.log('finished')
    resolve() // this resolve is used for display purpose only
}

const test_multiple_batches_promise = async () => {
    return new Promise(async (resolve) => {
        test_multiple_batches(resolve)
    })
}

const test_single_batch_promise = async () => {
    return new Promise(async (resolve) => {
        test_single_batch(resolve)
    })
}

const test_abort_queue_promise = async () => {
    return new Promise(async (resolve) => {
        test_abort_queue(resolve)
    })
}
const allTests = async () => {
    console.log('------------------- abort queue ---------------------------')
    await test_abort_queue_promise()
    console.log('---------------------- single batch -------------------------')
    await test_single_batch_promise()
    console.log('------------------------multiple batches ------------------')
    await test_multiple_batches_promise()
}

allTests()

abort-promise-queue can be used in node.js