38 lines
2.0 KiB
TypeScript
38 lines
2.0 KiB
TypeScript
import "server-only";
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import { createReadStream, createWriteStream } from "node:fs";
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import { mkdir, stat, statfs, unlink, readdir } from "node:fs/promises";
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import { join } from "node:path";
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import { tmpdir } from "node:os";
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import { pipeline } from "node:stream/promises";
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import { Readable, Transform } from "node:stream";
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import JSZip from "jszip";
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const directory = join(tmpdir(), "canvas-download-zips-v1");
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export async function writeDownloadZip(zip: JSZip, id: string, progress: (percent: number) => void) {
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await mkdir(directory, { recursive: true, mode: 0o700 });
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// Remove abandoned files after restart as well as expired in-process tasks.
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for (const name of await readdir(directory)) {
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const path = join(directory, name);
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if ((await stat(path)).mtimeMs < Date.now() - 60 * 60_000) await unlink(path).catch(() => undefined);
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}
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const path = join(directory, `${id}.zip`);
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try {
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const disk = await statfs(directory);
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const budget = disk.bavail * disk.bsize - 1024 * 1024 * 1024;
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let written = 0;
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const guard = new Transform({ transform(chunk, _encoding, callback) {
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written += chunk.length;
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callback(written > budget ? new Error("服务器下载空间不足，请减少本次图片数量") : null, chunk);
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} });
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await pipeline(zip.generateNodeStream({ type: "nodebuffer", streamFiles: true, compression: "STORE" },
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metadata => progress(metadata.percent)), guard, createWriteStream(path, { mode: 0o600 }));
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return { path, bytes: (await stat(path)).size };
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} catch (error) { await unlink(path).catch(() => undefined); throw error; }
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}
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export function readDownloadZip(path: string) {
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return Readable.toWeb(createReadStream(path)) as ReadableStream<Uint8Array>;
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}
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export function streamDownloadZip(zip: JSZip) {
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return Readable.toWeb(zip.generateNodeStream({ type: "nodebuffer", streamFiles: true, compression: "STORE" }) as Readable) as ReadableStream<Uint8Array>;
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}
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export async function removeDownloadZip(path: string) { await unlink(path).catch(() => undefined); }
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