fix: use zip.async

src/content/comic.ts

@@ -26,7 +26,7 @@ export class ComicReferrer extends createDefaultClass("comic"){
     async initDesc():Promise<void>{
         if(this.desc !== undefined) return;
         const zip = await readZip(this.path);
-        const entries = zip.entries();
+        const entries = await zip.entries();
         this.pagenum = Object.keys(entries).filter(x=>ImageExt.includes(extname(x))).length;
         const entry =  entries["desc.json"];
         if(entry === undefined){

src/route/comic.ts

@@ -3,17 +3,17 @@ import {
   createReadableStreamFromZip,
   entriesByNaturalOrder,
   readZip,
+  ZipAsync,
 } from "../util/zipwrap";
 import { since_last_modified } from "./util";
 import { ContentContext } from "./context";
 import Router from "koa-router";
-import StreamZip from "node-stream-zip";
 
 /**
  * zip stream cache.
  */
 
-let ZipStreamCache: { [path: string]: [StreamZip, number] } = {};
+let ZipStreamCache: { [path: string]: [ZipAsync, number] } = {};
 
 async function acquireZip(path: string) {
   if (ZipStreamCache[path] === undefined) {
@@ -48,7 +48,7 @@ async function renderZipImage(ctx: Context, path: string, page: number) {
   const image_ext = ["gif", "png", "jpeg", "bmp", "webp", "jpg"];
   //console.log(`opened ${page}`);
   let zip = await acquireZip(path);
-  const entries = entriesByNaturalOrder(zip).filter((x) => {
+  const entries = (await entriesByNaturalOrder(zip)).filter((x) => {
     const ext = x.name.split(".").pop();
     return ext !== undefined && image_ext.includes(ext);
   });

src/util/zipwrap.ts

@@ -1,41 +1,26 @@
-import StreamZip, { ZipEntry } from 'node-stream-zip';
+import { ZipEntry } from 'node-stream-zip';
+
 import {orderBy} from 'natural-orderby';
 import { ReadStream } from 'fs';
+import StreamZip from 'node-stream-zip';
 
-export async function readZip(path : string):Promise<StreamZip>{
-    return new Promise((resolve,reject)=>{
-            let zip = new StreamZip({
+export type ZipAsync = InstanceType<typeof StreamZip.async>;
+export async function readZip(path : string): Promise<ZipAsync>{
+    return new StreamZip.async({
         file:path,
         storeEntries: true
     });
-            zip.on('error',(err)=>{
-                console.error(`read zip file ${path}`);
-                reject(err);
-            });
-            zip.on('ready',()=>{
-                resolve(zip);
-            });
-        }
-    );
 }
-export function entriesByNaturalOrder(zip: StreamZip){
-    const entries = zip.entries();
+export async function entriesByNaturalOrder(zip: ZipAsync){
+    const entries = await zip.entries();
     const ret = orderBy(Object.values(entries),v=>v.name);
     return ret;
 }
-export async function createReadableStreamFromZip(zip:StreamZip,entry: ZipEntry):Promise<NodeJS.ReadableStream>{
-    return new Promise((resolve,reject)=>{
-        zip.stream(entry,(err, stream)=>{
-            if(stream !== undefined){
-                resolve(stream);
-            }
-            else{
-                reject(err);
-            }
-        });}
-    );
+
+export async function createReadableStreamFromZip(zip:ZipAsync,entry: ZipEntry):Promise<NodeJS.ReadableStream>{
+    return await zip.stream(entry);
 }
-export async function readAllFromZip(zip:StreamZip,entry: ZipEntry):Promise<Buffer>{
+export async function readAllFromZip(zip:ZipAsync,entry: ZipEntry):Promise<Buffer>{
     const stream = await createReadableStreamFromZip(zip,entry);
     const chunks:Uint8Array[] = [];
     return new Promise((resolve,reject)=>{