Created
April 19, 2022 08:46
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Upload Tasks
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| export class Uploader<FileData, UploadResponse> { | |
| private tasks: ITask<FileData, UploadResponse>[] = []; | |
| constructor(public options: UploadOptions<FileData, UploadResponse>) {} | |
| private async uploadWithRetry(task: ITask<FileData, UploadResponse>) { | |
| let index = 0; | |
| const { | |
| file, | |
| deferred: { resolve, reject }, | |
| } = task; | |
| const { | |
| backoff = fibonacci, | |
| maxRetries = 5, | |
| uploadContent, | |
| shouldRetry, | |
| } = this.options; | |
| while (index < 1 + maxRetries) { | |
| try { | |
| resolve(await uploadContent(file)); | |
| break; | |
| } catch (err) { | |
| if (shouldRetry?.(err)) { | |
| await wait(backoff((index += 1))); | |
| } else { | |
| reject({ reason: 'unableToRetry' }); | |
| } | |
| } | |
| } | |
| reject({ reason: 'maxRetryCountExceeded' }); | |
| } | |
| private checkTasks() { | |
| const { | |
| tasks, | |
| options: { parallelLimit = 5 }, | |
| } = this; | |
| let available = parallelLimit - tasks.filter((task) => task.running).length; | |
| for (let i = 0; available > 0 && i < tasks.length; i++) { | |
| const task = tasks[i]; | |
| if (!task.running) { | |
| task.running = true; | |
| available -= 1; | |
| this.uploadWithRetry(task).finally(() => { | |
| tasks.splice(tasks.indexOf(task), 1); | |
| process.nextTick(() => this.checkTasks()); | |
| }); | |
| } | |
| } | |
| } | |
| public upload(file: FileData): Promise<UploadResponse> { | |
| return new Promise((resolve, reject) => { | |
| this.tasks.push({ | |
| file, | |
| running: false, | |
| deferred: { resolve, reject }, | |
| }); | |
| process.nextTick(() => this.checkTasks()); | |
| }); | |
| } | |
| } | |
| export type UploadOptions<FileData, UploadResponse> = { | |
| maxRetries?: number; | |
| parallelLimit?: number; | |
| backoff?(n: number): number; | |
| shouldRetry(err: unknown): boolean | undefined; | |
| uploadContent(file: FileData): Promise<UploadResponse>; | |
| }; | |
| type ITask<F, R> = { | |
| file: F; | |
| running: boolean; | |
| deferred: { | |
| resolve(response: R): void; | |
| reject(error: { reason: 'unableToRetry' | 'maxRetryCountExceeded' }): void; | |
| }; | |
| }; | |
| function wait(seconds: number) { | |
| return new Promise((resolve) => setTimeout(resolve, seconds * 1000)); | |
| } | |
| function fibonacci(n: number, ac1 = 1, ac2 = 1): number { | |
| return n < 2 ? ac2 : fibonacci(n - 1, ac2, ac1 + ac2); | |
| } |
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| import crypto from 'crypto'; | |
| import { Uploader } from './uploader'; | |
| const cache = new Map<string, string>(); | |
| const md5 = (file: string | Buffer) => | |
| crypto.createHash('md5').update(file).digest('hex'); | |
| const uploader = new Uploader({ | |
| maxRetries: 10, | |
| parallelLimit: 5, | |
| backoff(n) { | |
| return Math.pow(n, 2); // fibonacci(n) | |
| }, | |
| shouldRetry(error) { | |
| // 这里可以针对 error 的类型做一些判断 | |
| // 有些错误可以尝试重新上传的返回 true 即可 | |
| if (error && (error as { code: number }).code === 1234) { | |
| return true; | |
| } | |
| return false; | |
| }, | |
| async uploadContent(file: { | |
| name: string; | |
| content: string | Buffer; | |
| extname: string; | |
| }) { | |
| const hash = md5(file.content); | |
| if (cache.has(hash)) { | |
| return cache.get(hash); | |
| } | |
| return fetch('/path/to/upload', { body: file.content }); | |
| }, | |
| }); | |
| uploader | |
| .upload({ | |
| name: 'hello.js', | |
| content: 'console.log("hello world");', | |
| extname: 'js', | |
| }) | |
| .then((res) => { | |
| // 上传成功 | |
| }) | |
| .catch((err) => { | |
| // 上传失败 | |
| }); |
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