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Feat: implement parallel fetch w/ HTTP 304 (#43)

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Sukka
2024-10-09 20:49:36 +08:00
committed by GitHub
parent 07d3fdf05b
commit 2e48a72a3c
10 changed files with 273 additions and 111 deletions
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24
Build/lib/fetch-assets.ts
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@@ -3,12 +3,30 @@ import { defaultRequestInit, fetchWithRetry } from './fetch-retry';
import { setTimeout } from 'node:timers/promises';
// eslint-disable-next-line sukka/unicorn/custom-error-definition -- typescript is better
class CustomAbortError extends Error {
export class CustomAbortError extends Error {
public readonly name = 'AbortError';
public readonly digest = 'AbortError';
}
const sleepWithAbort = (ms: number, signal: AbortSignal) => new Promise<void>((resolve, reject) => {
export class Custom304NotModifiedError extends Error {
public readonly name = 'Custom304NotModifiedError';
public readonly digest = 'Custom304NotModifiedError';
constructor(public readonly url: string) {
super('304 Not Modified');
}
}
export class CustomNoETagFallbackError extends Error {
public readonly name = 'CustomNoETagFallbackError';
public readonly digest = 'CustomNoETagFallbackError';
constructor(public readonly data: string) {
super('No ETag Fallback');
}
}
export const sleepWithAbort = (ms: number, signal: AbortSignal) => new Promise<void>((resolve, reject) => {
if (signal.aborted) {
reject(signal.reason as Error);
return;
@@ -34,7 +52,7 @@ export async function fetchAssets(url: string, fallbackUrls: string[] | readonly
const createFetchFallbackPromise = async (url: string, index: number) => {
// Most assets can be downloaded within 250ms. To avoid wasting bandwidth, we will wait for 500ms before downloading from the fallback URL.
try {
await sleepWithAbort(500 + (index + 1) * 20, controller.signal);
await sleepWithAbort(500 + (index + 1) * 10, controller.signal);
} catch {
console.log(picocolors.gray('[fetch cancelled early]'), picocolors.gray(url));
throw new CustomAbortError();