astro/dist/assets/fonts/infra/cached-font-fetcher.js

Astro is a modern site builder with web best practices, performance, and DX front-of-mind.

import { isAbsolute } from "node:path";
import { AstroError, AstroErrorData } from "../../../core/errors/index.js";
export class CachedFontFetcher {
	#storage;
	#fetch;
	#readFile;
	constructor({ storage, fetch, readFile }) {
		this.#storage = storage;
		this.#fetch = fetch;
		this.#readFile = readFile;
	}
	async #cache(storage, key, cb) {
		const existing = await storage.getItemRaw(key);
		if (existing) {
			return existing;
		}
		const data = await cb();
		await storage.setItemRaw(key, data);
		return data;
	}
	async fetch({ id, url, init }) {
		return await this.#cache(this.#storage, id, async () => {
			try {
				if (isAbsolute(url)) {
					return await this.#readFile(url);
				}
				const response = await this.#fetch(url, init ?? undefined);
				if (!response.ok) {
					throw new Error(`Response was not successful, received status code ${response.status}`);
				}
				return Buffer.from(await response.arrayBuffer());
			} catch (cause) {
				throw new AstroError({
					...AstroErrorData.CannotFetchFontFile,
					message: AstroErrorData.CannotFetchFontFile.message(url)
				}, { cause });
			}
		});
	}
}