fix: memory leaks

package.json

@@ -1,6 +1,6 @@
 {
   "name": "Miru",
-  "version": "4.0.8",
+  "version": "4.0.9",
   "author": "ThaUnknown_ <ThaUnknown@users.noreply.github.com>",
   "description": "Stream anime torrents, real-time with no waiting for downloads.",
   "main": "build/main.js",
@@ -43,7 +43,7 @@
     "webpack": "^5.85.0",
     "webpack-cli": "^5.1.3",
     "webpack-dev-server": "^4.15.0",
-    "webtorrent": "^2.0.37"
+    "webtorrent": "^2.1.0"
   },
   "standard": {
     "ignore": [

src/background/background.js

@@ -51,13 +51,19 @@ class TorrentClient extends WebTorrent {
   async handleMessage ({ data }) {
     switch (data.type) {
       case 'current': {
-        this.current?.removeListener('done', this.boundParse)
-        this.cancelParse()
-        this.current = null
-        this.metadata = null
-        this.parsed = false
         if (data.data) {
-          this.current = (await this.get(data.data.infoHash))?.files.find(file => file.path === data.data.path)
+          const found = (await this.get(data.data.infoHash))?.files.find(file => file.path === data.data.path)
+          if (this.current) {
+            this.current?.removeListener('done', this.boundParse)
+            this.current?.removeAllListeners('iterator')
+            // this is a patch, idfk why these leak
+            for (const iterator of this.current._iterators) {
+              iterator.destroy()
+            }
+          }
+          this.cancelParse()
+          this.parsed = false
+          this.current = found
           if (this.current?.name.endsWith('.mkv')) {
             // if (this.current.done) this.parseSubtitles()
             // this.current.once('done', this.boundParse)
@@ -125,22 +131,23 @@ class TorrentClient extends WebTorrent {
 
   cancelParse () {
     this.parser?.destroy()
+    this.metadata?.destroy()
+    this.metadata = undefined
     this.parser = undefined
   }
 
   parseFonts (file) {
-    const stream = new SubtitleParser(file)
+    this.metadata = new SubtitleParser(file)
-    this.handleSubtitleParser(stream)
+    this.handleSubtitleParser(this.metadata)
-    stream.once('tracks', tracks => {
+    this.metadata.once('tracks', tracks => {
       if (!tracks.length) {
         this.parsed = true
-        stream.destroy()
+        this.metadata.destroy()
       }
     })
-    stream.once('subtitle', () => {
+    this.metadata.once('subtitle', () => {
-      stream.destroy()
+      this.metadata.destroy()
     })
-    this.metadata = stream
   }
 
   handleSubtitleParser (parser, skipFile) {

src/background/matroska.js

@@ -1,6 +1,5 @@
 import { EbmlIteratorDecoder, EbmlTagId } from 'ebml-iterator'
 import { EventEmitter } from 'events'
-import join from 'join-async-iterator'
 import { inflate } from 'pako'
 
 const SSA_TYPES = new Set(['ssa', 'ass'])
@@ -53,10 +52,7 @@ export class SubtitleParserBase extends EventEmitter {
       [EbmlTagId.BlockGroup]: this.handleBlockGroup.bind(this),
       [EbmlTagId.Chapters]: this.handleChapters.bind(this)
     }
-  }
+    this.decoder = new EbmlIteratorDecoder({
-
-  async * [Symbol.asyncIterator] (stream) {
-    const decoder = new EbmlIteratorDecoder({
       bufferTagIds: [
         EbmlTagId.TimecodeScale,
         EbmlTagId.Tracks,
@@ -64,20 +60,17 @@ export class SubtitleParserBase extends EventEmitter {
         EbmlTagId.AttachedFile,
         EbmlTagId.Chapters,
         EbmlTagId.Duration
-      ],
+      ]
-      stream
     })
+  }
 
-    for await (const chunk of stream) {
+  decoderWrite (chunk) {
-      if (this.destroyed) return null
+    const tags = this.decoder.parseTags(chunk)
-      const tags = decoder.parseTags(chunk)
+    for (const tag of tags) {
-      for (const tag of tags) {
+      this._tagMap[tag.id]?.(tag)
-        this._tagMap[tag.id]?.(tag)
+      if (tag.id === EbmlTagId.Tracks) {
-        if (tag.id === EbmlTagId.Tracks) {
+        if (!tag.Children.some(({ id }) => id === EbmlTagId.TrackEntry)) return this.destroy()
-          if (!tag.Children.some(({ id }) => id === EbmlTagId.TrackEntry)) return this.destroy()
-        }
       }
-      yield chunk
     }
   }
 
@@ -200,12 +193,16 @@ export class SubtitleParser extends SubtitleParserBase {
     super()
 
     ;(async () => {
+      const iterator = stream[Symbol.asyncIterator]()
       try {
-      // eslint-disable-next-line no-unused-vars
+        // eslint-disable-next-line no-unused-vars
-        for await (const _ of super[Symbol.asyncIterator](stream)) {
+        for await (const chunk of iterator) {
-          if (this.destroyed) break
+          if (this.destroyed) return iterator.return()
+          this.decoderWrite(chunk)
         }
-      } catch (e) {}
+      } catch (e) {
+        iterator.return()
+      }
       this.emit('finish')
     })()
   }
@@ -227,35 +224,40 @@ export class SubtitleStream extends SubtitleParserBase {
     }
   }
 
-  async * [Symbol.asyncIterator] (stream = this._stream) {
+  destroy () {
-    while (true) {
+    this.destroyed = true
-      if (this.destroyed) return
+    this.emit('finish')
-      if (this.unstable) {
+    this._stream.return()
-        const iterator = stream[Symbol.asyncIterator]()
+  }
-        const { value: chunk } = await iterator.next()
+
-        if (!chunk) return
+  async * [Symbol.asyncIterator] () {
-        // the ebml decoder expects to see a tag, so we won't use it until we find a cluster
+    try {
-        for (let i = 0; i < chunk.length - 12; i++) {
+      for await (const chunk of this._stream) {
-        // cluster id 0x1F43B675
+        if (this.destroyed) return this._stream.return()
-        // https://matroska.org/technical/elements.html#LevelCluster
+        if (this.unstable) {
-          if (chunk[i] === 0x1f && chunk[i + 1] === 0x43 && chunk[i + 2] === 0xb6 && chunk[i + 3] === 0x75) {
+          // the ebml decoder expects to see a tag, so we won't use it until we find a cluster
-          // length of cluster size tag
+          for (let i = 0; i < chunk.length - 12; i++) {
-            const len = 8 - Math.floor(Math.log2(chunk[i + 4]))
+            // cluster id 0x1F43B675
-            // first tag in cluster is a valid EbmlTag
+            // https://matroska.org/technical/elements.html#LevelCluster
-            if (EbmlTagId[chunk[i + 4 + len]]) {
+            if (chunk[i] === 0x1f && chunk[i + 1] === 0x43 && chunk[i + 2] === 0xb6 && chunk[i + 3] === 0x75) {
-            // okay this is probably a cluster
+              // length of cluster size tag
-              this.unstable = false
+              const len = 8 - Math.floor(Math.log2(chunk[i + 4]))
-              yield chunk.slice(0, i)
+              // first tag in cluster is a valid EbmlTag
-              yield * super[Symbol.asyncIterator](join([[chunk.slice(i)], iterator]))
+              if (EbmlTagId[chunk[i + 4 + len]]) {
-              return
+                // okay this is probably a cluster
+                this.unstable = false
+                this.decoderWrite(chunk.slice(i))
+              }
             }
           }
+        } else {
+          this.decoderWrite(chunk)
         }
         yield chunk
-      } else {
-        yield * super[Symbol.asyncIterator](stream)
-        return
       }
+    } finally {
+      this._stream.return()
     }
+    this._stream.return()
   }
 }