import { writeJson } from 'fs-extra/esm' import { rename } from 'fs/promises' import PQueue from 'p-queue' import { basename } from 'path' import { mapToJSON } from '@server/helpers/core-utils.js' import { logger, loggerTagsFactory } from '@server/helpers/logger.js' import { MStreamingPlaylistVideo } from '@server/types/models/index.js' import { buildSha256Segment } from '../hls.js' import { storeHLSFileFromPath } from '../object-storage/index.js' const lTags = loggerTagsFactory('live') class LiveSegmentShaStore { private readonly segmentsSha256 = new Map() private readonly videoUUID: string private readonly sha256Path: string private readonly sha256PathTMP: string private readonly streamingPlaylist: MStreamingPlaylistVideo private readonly sendToObjectStorage: boolean private readonly writeQueue = new PQueue({ concurrency: 1 }) constructor (options: { videoUUID: string sha256Path: string streamingPlaylist: MStreamingPlaylistVideo sendToObjectStorage: boolean }) { this.videoUUID = options.videoUUID this.sha256Path = options.sha256Path this.sha256PathTMP = options.sha256Path + '.tmp' this.streamingPlaylist = options.streamingPlaylist this.sendToObjectStorage = options.sendToObjectStorage } async addSegmentSha (segmentPath: string) { logger.debug('Adding live sha segment %s.', segmentPath, lTags(this.videoUUID)) const shaResult = await buildSha256Segment(segmentPath) const segmentName = basename(segmentPath) this.segmentsSha256.set(segmentName, shaResult) try { await this.writeToDisk() } catch (err) { logger.error('Cannot write sha segments to disk.', { err }) } } async removeSegmentSha (segmentPath: string) { const segmentName = basename(segmentPath) logger.debug('Removing live sha segment %s.', segmentPath, lTags(this.videoUUID)) if (!this.segmentsSha256.has(segmentName)) { logger.warn( 'Unknown segment in live segment hash store for video %s and segment %s.', this.videoUUID, segmentPath, lTags(this.videoUUID) ) return } this.segmentsSha256.delete(segmentName) await this.writeToDisk() } private writeToDisk () { return this.writeQueue.add(async () => { logger.debug(`Writing segment sha JSON ${this.sha256Path} of ${this.videoUUID} on disk.`, lTags(this.videoUUID)) // Atomic write: use rename instead of move that is not atomic await writeJson(this.sha256PathTMP, mapToJSON(this.segmentsSha256)) await rename(this.sha256PathTMP, this.sha256Path) if (this.sendToObjectStorage) { const url = await storeHLSFileFromPath(this.streamingPlaylist, this.sha256Path) if (this.streamingPlaylist.segmentsSha256Url !== url) { this.streamingPlaylist.segmentsSha256Url = url await this.streamingPlaylist.save() } } }) } } export { LiveSegmentShaStore }