127 lines
3.5 KiB
TypeScript
127 lines
3.5 KiB
TypeScript
/**
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* 视频转码任务队列
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*
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* 用于控制转码任务的并发数，避免低性能 NAS 设备过载
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*/
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interface QueuedTask {
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materialId: string
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videoSourceUrl: string
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needsCoverImage: boolean
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resolve: () => void
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reject: (error: Error) => void
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}
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class VideoTranscodeQueue {
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private queue: QueuedTask[] = []
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private processing: Set<string> = new Set()
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private queued: Set<string> = new Set()
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private maxConcurrent: number
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constructor(maxConcurrent: number = 1) {
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// 默认并发数为 1，适合低性能 NAS 设备
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// 可以通过环境变量配置：VIDEO_TRANSCODE_MAX_CONCURRENT
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this.maxConcurrent = maxConcurrent || parseInt(process.env.VIDEO_TRANSCODE_MAX_CONCURRENT || '1', 10)
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}
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/**
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* 添加转码任务到队列
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*/
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async add(
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materialId: string,
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videoSourceUrl: string,
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needsCoverImage: boolean,
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taskFn: (materialId: string, videoSourceUrl: string, needsCoverImage: boolean, retryCount?: number) => Promise<void>
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): Promise<void> {
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// 如果已经在处理中，直接返回
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if (this.processing.has(materialId)) {
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console.log(`[TranscodeQueue] Material ${materialId} is already processing, skipping`)
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return
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}
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if (this.queued.has(materialId)) {
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console.log(`[TranscodeQueue] Material ${materialId} is already queued, skipping`)
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return
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}
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return new Promise((resolve, reject) => {
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this.queue.push({
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materialId,
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videoSourceUrl,
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needsCoverImage,
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resolve,
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reject,
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})
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this.queued.add(materialId)
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// 立即尝试处理队列
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this.process(taskFn)
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})
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}
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/**
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* 处理队列中的任务
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*/
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private async process(
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taskFn: (materialId: string, videoSourceUrl: string, needsCoverImage: boolean) => Promise<void>
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): Promise<void> {
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// 如果已达到最大并发数，等待
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if (this.processing.size >= this.maxConcurrent) {
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console.log(`[TranscodeQueue] 已达到最大并发数 (${this.maxConcurrent})，等待...`)
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return
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}
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// 如果队列为空，返回
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if (this.queue.length === 0) {
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return
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}
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// 取出队列中的第一个任务
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const task = this.queue.shift()
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if (!task) {
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return
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}
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this.queued.delete(task.materialId)
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console.log(`[TranscodeQueue] 开始处理任务: ${task.materialId} (队列剩余: ${this.queue.length})`)
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// 标记为处理中
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this.processing.add(task.materialId)
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// 执行任务（确保异步执行）
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Promise.resolve()
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.then(() => taskFn(task.materialId, task.videoSourceUrl, task.needsCoverImage))
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.then(() => {
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console.log(`[TranscodeQueue] ✓ 任务完成: ${task.materialId}`)
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task.resolve()
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})
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.catch((error) => {
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console.error(`[TranscodeQueue] ✗ 任务失败: ${task.materialId}`, error)
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task.reject(error)
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})
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.finally(() => {
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// 从处理中移除
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this.processing.delete(task.materialId)
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console.log(`[TranscodeQueue] 任务结束: ${task.materialId} (处理中: ${this.processing.size})`)
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// 继续处理下一个任务
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this.process(taskFn)
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})
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}
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/**
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* 获取队列状态
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*/
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getStatus() {
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return {
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queueLength: this.queue.length,
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processingCount: this.processing.size,
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processingIds: Array.from(this.processing),
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queuedIds: Array.from(this.queued),
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maxConcurrent: this.maxConcurrent,
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}
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}
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}
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// 单例模式
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export const transcodeQueue = new VideoTranscodeQueue()
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