siimee/backend/lib/utils.js

const PassThrough = require('stream').PassThrough

const allStreams = {}

const activeStream = name => allStreams[name]

/**
 * Takes an open HTTP stream and writes
 * a msg to it, then fires notification plugin's
 * onEvent callback
 * @param {object} msg you want to send
 * @param {string} name <profileId>.<eventType>
 * @param {object} req server request object
 * @param {Toolkit} h hapi common response toolkit
 */
const dispatchNotification = (msg, name, h) => {
    const stream = activeStream(name)
    if (!stream) return
    stream.write(msg)
    return h.event(stream, h, { event: name })
}

const intializeStream = (name, h) => {
    allStreams[name] = new PassThrough({ objectMode: true })

    return dispatchNotification(
        {
            profile_id: name,
            name: 'BDGRS',
            price: (500 + Math.floor(Math.random() * 100)).toString(),
            order: Math.floor(Math.random() * 2) === 1 ? 'BUY' : 'SELL',
            type: 'info',
        },
        name,
        h,
    )
}

module.exports = {
    dispatchNotification,
    allStreams,
    intializeStream,
}