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import { randomUUID } from 'node:crypto'
import { once } from 'node:events'
import fs from 'node:fs'
import fsPromises from 'node:fs/promises'
import { extname, join } from 'node:path'
import { PassThrough, Writable } from 'node:stream'
import { pipeline } from 'node:stream/promises'
import Throttle from 'throttle'
import { FX_DIR, PUBLIC_DIR, SOX } from './config.js'
import { BAD_REQUEST_ERROR } from './errors.js'
import { logger } from './util.js'
export default class Service {
constructor () {
this.bitrate = 0
this.clientStreams = new Map()
this.readStream = null
this.songPath = SOX.CONVERSATION
this.throttle = null
}
appendFxStream (command) {
const fxPath = this.getFxPath(command)
const newThrottle = new Throttle(this.bitrate)
pipeline(newThrottle, this.broadcast())
this.throttle.on('unpipe', () => this.appendFxStreamOnUnpipe(fxPath, newThrottle))
this.throttle.pause()
this.readStream.unpipe(this.throttle)
}
appendFxStreamOnUnpipe (fxPath, newThrottle) {
const newReadStream = this.mergeAudioStreams(fxPath, this.readStream)
this.readStream = newReadStream
this.throttle = newThrottle
this.readStream.removeListener('unpipe', () => this.appendFxStreamOnUnpipe(fxPath, newThrottle))
pipeline(newReadStream, newThrottle)
}
broadcast () {
return new Writable({
write: (chunk, encoding, callback) => {
for (const [id, stream] of this.clientStreams) {
if (stream.writableEnded) {
this.clientStreams.delete(id)
continue
}
stream.write(chunk)
}
callback()
}
})
}
createClientStream () {
const id = randomUUID()
const stream = new PassThrough()
this.clientStreams.set(id, stream)
return {
id, stream
}
}
/** @param {string} fileName */
createFileStream (fileName) {
return fs.createReadStream(fileName)
}
executeSoxCommand (args) {
return child_process.spawn('sox', args)
}
async getBitrate (filePath) {
try {
const args = ['--i', '-B', filePath]
const { stdout, stderr } = this.executeSoxCommand(args)
await Promise.all([once(stdout, 'readable'), once(stderr, 'readable')])
const [success, error] = [stdout, stderr].map(stream => stream.read())
if (error) await Promise.reject(error)
return success.toString().trim().replace(/k/, '000')
}
catch (error) {
logger.error(error)
return SOX.FALLBACK_BITRATE
}
}
/** @param {string} fileName */
async getFileInfo (fileName) {
const name = join(PUBLIC_DIR, fileName)
await fsPromises.access(name)
const type = extname(name)
return {
name, type
}
}
/** @param {string} fileName */
async getFileStream (fileName) {
const { name, type } = await this.getFileInfo(fileName)
const stream = this.createFileStream(name)
return {
stream, type
}
}
/** @param {string} fileName */
getFxPath (fileName) {
const filePath = join(FX_DIR, `${fileName}.mp3`)
if (!fs.existsSync(filePath)) throw BAD_REQUEST_ERROR
return filePath
}
mergeAudioStreams (fxPath, readStream) {
const transform = new PassThrough()
const args = [
'-t', SOX.AUDIO_MEDIA_TYPE,
'-v', SOX.SONG_VOLUME,
'-m', '-',
'-t', SOX.AUDIO_MEDIA_TYPE,
'-v', SOX.FX_VOLUME,
fxPath,
'-t', SOX.AUDIO_MEDIA_TYPE,
'-'
]
const { stdin, stdout } = this.executeSoxCommand(args)
pipeline(readStream, stdin)
pipeline(stdout, transform)
return transform
}
/** @param {`${string}-${string}-${string}-${string}-${string}`} id */
removeClientStream (id) {
this.clientStreams.delete(id)
}
async startStream () {
const bitrate = this.bitrate = await this.getBitrate(this.songPath) / SOX.BITRATE_DIVISOR
const throttle = this.throttle = new Throttle(bitrate)
const readStream = this.readStream = this.createFileStream(this.songPath)
return pipeline(readStream, throttle, this.broadcast())
}
async stopStream () {
// this.throttle?.end?.()
this.readStream.destroy()
}
} |