use zip.js
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04ce1306b7
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@ -5,7 +5,7 @@
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"main": "build/app.js",
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"scripts": {
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"compile": "swc src --out-dir dist",
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"dev": "nodemon -r @swc-node/register --exec node app.ts",
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"dev": "nodemon -r @swc-node/register --enable-source-maps --exec node app.ts",
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"start": "node build/app.js"
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},
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"author": "",
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@ -1,26 +1,33 @@
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import { type Context, DefaultContext, DefaultState, Next } from "koa";
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import Router from "koa-router";
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import { createReadableStreamFromZip, entriesByNaturalOrder, readZip, type ZipAsync } from "../util/zipwrap";
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import { createReadableStreamFromZip, entriesByNaturalOrder, readZip } from "../util/zipwrap";
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import type { ContentContext } from "./context";
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import { since_last_modified } from "./util";
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import type { ZipReader } from "@zip.js/zip.js";
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import type { FileHandle } from "node:fs/promises";
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import { Readable, Writable } from "node:stream";
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/**
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* zip stream cache.
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*/
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const ZipStreamCache: { [path: string]: [ZipAsync, number] } = {};
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const ZipStreamCache: {
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[path: string]: [{
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reader: ZipReader<FileHandle>,
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handle: FileHandle
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}, number]
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} = {};
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async function acquireZip(path: string) {
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if (!(path in ZipStreamCache)) {
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const ret = await readZip(path);
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ZipStreamCache[path] = [ret, 1];
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const obj = await readZip(path);
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ZipStreamCache[path] = [obj, 1];
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// console.log(`acquire ${path} 1`);
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return ret;
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return obj.reader;
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}
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const [ret, refCount] = ZipStreamCache[path];
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ZipStreamCache[path] = [ret, refCount + 1];
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// console.log(`acquire ${path} ${refCount + 1}`);
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return ret;
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return ret.reader;
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}
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function releaseZip(path: string) {
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@ -29,7 +36,10 @@ function releaseZip(path: string) {
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const [ref, refCount] = obj;
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// console.log(`release ${path} : ${refCount}`);
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if (refCount === 1) {
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ref.close();
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const { reader, handle } = ref;
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reader.close().then(() => {
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handle.close();
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});
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delete ZipStreamCache[path];
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} else {
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ZipStreamCache[path] = [ref, refCount - 1];
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@ -41,33 +51,35 @@ async function renderZipImage(ctx: Context, path: string, page: number) {
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// console.log(`opened ${page}`);
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const zip = await acquireZip(path);
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const entries = (await entriesByNaturalOrder(zip)).filter((x) => {
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const ext = x.name.split(".").pop();
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const ext = x.filename.split(".").pop();
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return ext !== undefined && image_ext.includes(ext);
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});
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if (0 <= page && page < entries.length) {
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const entry = entries[page];
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const last_modified = new Date(entry.time);
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const last_modified = entry.lastModDate;
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if (since_last_modified(ctx, last_modified)) {
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return;
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}
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const read_stream = await createReadableStreamFromZip(zip, entry);
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/** Exceptions (ECONNRESET, ECONNABORTED) may be thrown when processing this request
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* for reasons such as when the browser unexpectedly closes the connection.
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* Once such an exception is raised, the stream is not properly destroyed,
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* so there is a problem with the zlib stream being accessed even after the stream is closed.
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* So it waits for 100 ms and releases it.
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* Additionaly, there is a risk of memory leak becuase zlib stream is not properly destroyed.
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* @todo modify function 'stream' in 'node-stream-zip' library to prevent memory leak */
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read_stream.once("close", () => {
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const nodeReadableStream = new Readable();
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nodeReadableStream._read = () => { };
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read_stream.pipeTo(new WritableStream({
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write(chunk) {
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nodeReadableStream.push(chunk);
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},
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close() {
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nodeReadableStream.push(null);
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setTimeout(() => {
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releaseZip(path);
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}, 100);
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});
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},
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}));
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ctx.body = read_stream;
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ctx.response.length = entry.size;
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ctx.body = nodeReadableStream;
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ctx.response.length = entry.uncompressedSize;
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// console.log(`${entry.name}'s ${page}:${entry.size}`);
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ctx.response.type = entry.name.split(".").pop() as string;
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ctx.response.type = entry.filename.split(".").pop() as string;
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ctx.status = 200;
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ctx.set("Date", new Date().toUTCString());
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ctx.set("Last-Modified", last_modified.toUTCString());
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@ -1,33 +1,59 @@
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import type { ZipEntry } from "node-stream-zip";
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import { ReadStream } from "node:fs";
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import { type FileHandle, open } from "node:fs/promises";
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import { orderBy } from "natural-orderby";
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import StreamZip from "node-stream-zip";
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import { ZipReader, Reader, type Entry } from "@zip.js/zip.js";
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export type ZipAsync = InstanceType<typeof StreamZip.async>;
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export async function readZip(path: string): Promise<ZipAsync> {
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return new StreamZip.async({
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file: path,
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storeEntries: true,
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});
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class FileReader extends Reader<FileHandle> {
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private fd: FileHandle;
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private offset: number;
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constructor(fd: FileHandle) {
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super(fd);
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this.fd = fd;
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this.offset = 0;
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}
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async init(): Promise<void> {
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this.offset = 0;
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this.size = (await this.fd.stat()).size;
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}
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close(): void {
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this.fd.close();
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}
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async readUint8Array(index: number, length: number): Promise<Uint8Array> {
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const buffer = new Uint8Array(length);
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const buf = await this.fd.read(buffer, 0, length, index);
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if (buf.bytesRead !== length) {
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console.error(`read error: ${buf.bytesRead} !== ${length}`);
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throw new Error("read error");
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}
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return buffer;
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}
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}
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export async function entriesByNaturalOrder(zip: ZipAsync) {
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const entries = await zip.entries();
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const ret = orderBy(Object.values(entries), (v) => v.name);
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export async function readZip(path: string): Promise<{
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reader: ZipReader<FileHandle>
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handle: FileHandle
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}> {
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const fd = await open(path);
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const reader = new ZipReader(new FileReader(fd), {
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useCompressionStream: true,
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preventClose: false,
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});
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return { reader, handle: fd };
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}
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export async function entriesByNaturalOrder(zip: ZipReader<FileHandle>) {
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// console.log(zip);
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const entries = await zip.getEntries();
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// console.log(entries.map((v) => v.filename));
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const ret = orderBy(entries, (v) => v.filename);
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return ret;
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}
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export async function createReadableStreamFromZip(zip: ZipAsync, entry: ZipEntry): Promise<NodeJS.ReadableStream> {
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return await zip.stream(entry);
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}
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export async function readAllFromZip(zip: ZipAsync, entry: ZipEntry): Promise<Buffer> {
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const stream = await createReadableStreamFromZip(zip, entry);
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const chunks: Uint8Array[] = [];
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return new Promise((resolve, reject) => {
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stream.on("data", (data) => {
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chunks.push(data);
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});
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stream.on("error", (err) => reject(err));
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stream.on("end", () => resolve(Buffer.concat(chunks)));
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});
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export async function createReadableStreamFromZip(_zip: ZipReader<FileHandle>, entry: Entry): Promise<ReadableStream> {
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if (entry.getData === undefined) {
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throw new Error("entry.getData is undefined");
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}
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const stream = new TransformStream<Uint8Array, Uint8Array>();
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entry.getData(stream.writable);
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return stream.readable;
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}
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