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import { close, ensureDir, move, open, outputJSON, pathExists, read, readFile, remove, stat, writeFile } from 'fs-extra'
import { flatten, uniq } from 'lodash'
import { basename, dirname, join } from 'path'
import { MStreamingPlaylistFilesVideo, MVideoWithFile } from '@server/types/models'
import { sha256 } from '../helpers/core-utils'
import { getAudioStreamCodec, getVideoStreamCodec, getVideoStreamSize } from '../helpers/ffprobe-utils'
import { logger } from '../helpers/logger'
import { doRequest, doRequestAndSaveToFile } from '../helpers/requests'
import { generateRandomString } from '../helpers/utils'
import { CONFIG } from '../initializers/config'
import { HLS_STREAMING_PLAYLIST_DIRECTORY, P2P_MEDIA_LOADER_PEER_VERSION } from '../initializers/constants'
import { sequelizeTypescript } from '../initializers/database'
import { VideoFileModel } from '../models/video/video-file'
import { VideoStreamingPlaylistModel } from '../models/video/video-streaming-playlist'
import { getHlsResolutionPlaylistFilename, getVideoFilePath } from './video-paths'
async function updateStreamingPlaylistsInfohashesIfNeeded () {
const playlistsToUpdate = await VideoStreamingPlaylistModel.listByIncorrectPeerVersion()
// Use separate SQL queries, because we could have many videos to update
for (const playlist of playlistsToUpdate) {
await sequelizeTypescript.transaction(async t => {
const videoFiles = await VideoFileModel.listByStreamingPlaylist(playlist.id, t)
playlist.assignP2PMediaLoaderInfoHashes(playlist.Video, videoFiles)
playlist.p2pMediaLoaderPeerVersion = P2P_MEDIA_LOADER_PEER_VERSION
await playlist.save({ transaction: t })
})
}
}
async function updateMasterHLSPlaylist (video: MVideoWithFile, playlist: MStreamingPlaylistFilesVideo) {
const directory = join(HLS_STREAMING_PLAYLIST_DIRECTORY, video.uuid)
const masterPlaylists: string[] = [ '#EXTM3U', '#EXT-X-VERSION:3' ]
const masterPlaylistPath = join(directory, playlist.playlistFilename)
for (const file of playlist.VideoFiles) {
const playlistFilename = getHlsResolutionPlaylistFilename(file.filename)
// If we did not generated a playlist for this resolution, skip
const filePlaylistPath = join(directory, playlistFilename)
if (await pathExists(filePlaylistPath) === false) continue
const videoFilePath = getVideoFilePath(playlist, file)
const size = await getVideoStreamSize(videoFilePath)
const bandwidth = 'BANDWIDTH=' + video.getBandwidthBits(file)
const resolution = `RESOLUTION=${size.width}x${size.height}`
let line = `#EXT-X-STREAM-INF:${bandwidth},${resolution}`
if (file.fps) line += ',FRAME-RATE=' + file.fps
const codecs = await Promise.all([
getVideoStreamCodec(videoFilePath),
getAudioStreamCodec(videoFilePath)
])
line += `,CODECS="${codecs.filter(c => !!c).join(',')}"`
masterPlaylists.push(line)
masterPlaylists.push(playlistFilename)
}
await writeFile(masterPlaylistPath, masterPlaylists.join('\n') + '\n')
}
async function updateSha256VODSegments (video: MVideoWithFile, playlist: MStreamingPlaylistFilesVideo) {
const json: { [filename: string]: { [range: string]: string } } = {}
const playlistDirectory = join(HLS_STREAMING_PLAYLIST_DIRECTORY, video.uuid)
// For all the resolutions available for this video
for (const file of playlist.VideoFiles) {
const rangeHashes: { [range: string]: string } = {}
const videoPath = getVideoFilePath(playlist, file)
const resolutionPlaylistPath = join(playlistDirectory, getHlsResolutionPlaylistFilename(file.filename))
// Maybe the playlist is not generated for this resolution yet
if (!await pathExists(resolutionPlaylistPath)) continue
const playlistContent = await readFile(resolutionPlaylistPath)
const ranges = getRangesFromPlaylist(playlistContent.toString())
const fd = await open(videoPath, 'r')
for (const range of ranges) {
const buf = Buffer.alloc(range.length)
await read(fd, buf, 0, range.length, range.offset)
rangeHashes[`${range.offset}-${range.offset + range.length - 1}`] = sha256(buf)
}
await close(fd)
const videoFilename = file.filename
json[videoFilename] = rangeHashes
}
const outputPath = join(playlistDirectory, playlist.segmentsSha256Filename)
await outputJSON(outputPath, json)
}
async function buildSha256Segment (segmentPath: string) {
const buf = await readFile(segmentPath)
return sha256(buf)
}
function downloadPlaylistSegments (playlistUrl: string, destinationDir: string, timeout: number, bodyKBLimit: number) {
let timer
let remainingBodyKBLimit = bodyKBLimit
logger.info('Importing HLS playlist %s', playlistUrl)
return new Promise<void>(async (res, rej) => {
const tmpDirectory = join(CONFIG.STORAGE.TMP_DIR, await generateRandomString(10))
await ensureDir(tmpDirectory)
timer = setTimeout(() => {
deleteTmpDirectory(tmpDirectory)
return rej(new Error('HLS download timeout.'))
}, timeout)
try {
// Fetch master playlist
const subPlaylistUrls = await fetchUniqUrls(playlistUrl)
const subRequests = subPlaylistUrls.map(u => fetchUniqUrls(u))
const fileUrls = uniq(flatten(await Promise.all(subRequests)))
logger.debug('Will download %d HLS files.', fileUrls.length, { fileUrls })
for (const fileUrl of fileUrls) {
const destPath = join(tmpDirectory, basename(fileUrl))
await doRequestAndSaveToFile(fileUrl, destPath, { bodyKBLimit: remainingBodyKBLimit })
const { size } = await stat(destPath)
remainingBodyKBLimit -= (size / 1000)
logger.debug('Downloaded HLS playlist file %s with %d kB remained limit.', fileUrl, Math.floor(remainingBodyKBLimit))
}
clearTimeout(timer)
await move(tmpDirectory, destinationDir, { overwrite: true })
return res()
} catch (err) {
deleteTmpDirectory(tmpDirectory)
return rej(err)
}
})
function deleteTmpDirectory (directory: string) {
remove(directory)
.catch(err => logger.error('Cannot delete path on HLS download error.', { err }))
}
async function fetchUniqUrls (playlistUrl: string) {
const { body } = await doRequest(playlistUrl)
if (!body) return []
const urls = body.split('\n')
.filter(line => line.endsWith('.m3u8') || line.endsWith('.mp4'))
.map(url => {
if (url.startsWith('http://') || url.startsWith('https://')) return url
return `${dirname(playlistUrl)}/${url}`
})
return uniq(urls)
}
}
// ---------------------------------------------------------------------------
export {
updateMasterHLSPlaylist,
updateSha256VODSegments,
buildSha256Segment,
downloadPlaylistSegments,
updateStreamingPlaylistsInfohashesIfNeeded
}
// ---------------------------------------------------------------------------
function getRangesFromPlaylist (playlistContent: string) {
const ranges: { offset: number, length: number }[] = []
const lines = playlistContent.split('\n')
const regex = /^#EXT-X-BYTERANGE:(\d+)@(\d+)$/
for (const line of lines) {
const captured = regex.exec(line)
if (captured) {
ranges.push({ length: parseInt(captured[1], 10), offset: parseInt(captured[2], 10) })
}
}
return ranges
}
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