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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 | 3x 18x 18x 18x 18x 18x 1x 1x 1x 1x 1x 1x 2x 2x 2x 2x 4x 2x 1x 1x 1x 1x 1x 2x 1x 1x 1x 1x 1x 1x 1x 1x 1x 2x 2x 1x 1x 1x 1x 1x 1x | import fs from 'fs'
import fsPromises from 'fs/promises'
import {
randomUUID
} from 'crypto'
import config from './config.js'
import {
PassThrough,
Writable
} from 'stream'
import {
once
} from 'events'
import streamsPromises from 'stream/promises'
import Throttle from 'throttle'
import childProcess from 'child_process'
import {
logger
} from './util.js'
import {
join,
extname
} from 'path'
const {
dir: {
publicDirectory
},
constants: {
fallbackBitRate,
englishConversation,
bitRateDivisor
}
} = config
export class Service {
constructor() {
this.clientStreams = new Map()
this.currentSong = englishConversation
this.currentBitRate = 0
this.throttleTransform = {}
this.currentReadable = {}
}
createClientStream() {
const id = randomUUID()
const clientStream = new PassThrough()
this.clientStreams.set(id, clientStream)
return {
id,
clientStream
}
}
removeClientStream(id) {
this.clientStreams.delete(id)
}
_executeSoxCommand(args) {
return childProcess.spawn('sox', args)
}
async getBitRate(song) {
try {
const args = [
'--i', // info
'-B', // bitrate
song
]
const {
stderr, // tudo que é erro
stdout, // tudo que é log
// stdin // enviar dados como stream
} = this._executeSoxCommand(args)
await Promise.all([
once(stderr, 'readable'),
once(stdout, 'readable'),
])
const [success, error] = [stdout, stderr].map(stream => stream.read())
if (error) return await Promise.reject(error)
return success
.toString()
.trim()
.replace(/k/, '000')
} catch (error) {
logger.error(`deu ruim no bitrate: ${error}`)
return fallbackBitRate
}
}
broadCast() {
return new Writable({
write: (chunk, enc, cb) => {
for (const [id, stream] of this.clientStreams) {
// se o cliente descontou não devemos mais mandar dados pra ele
if (stream.writableEnded) {
this.clientStreams.delete(id)
continue;
}
stream.write(chunk)
}
cb()
}
})
}
async startStreamming() {
logger.info(`starting with ${this.currentSong}`)
const bitRate = this.currentBitRate = (await this.getBitRate(this.currentSong)) / bitRateDivisor
const throttleTransform = this.throttleTransform = new Throttle(bitRate)
const songReadable = this.currentReadable = this.createFileStream(this.currentSong)
return streamsPromises.pipeline(
songReadable,
throttleTransform,
this.broadCast()
)
}
stopStreamming() {
this.throttleTransform?.end?.()
}
createFileStream(filename) {
return fs.createReadStream(filename)
}
async getFileInfo(file) {
// file = home/index.html
const fullFilePath = join(publicDirectory, file)
// valida se existe, se não existe estoura erro!!
await fsPromises.access(fullFilePath)
const fileType = extname(fullFilePath)
return {
type: fileType,
name: fullFilePath
}
}
async getFileStream(file) {
const {
name,
type
} = await this.getFileInfo(file)
return {
stream: this.createFileStream(name),
type
}
}
} |