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perf: reuse TextDecoder instance #2863

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merged 1 commit into from
Feb 27, 2024
Merged

perf: reuse TextDecoder instance #2863

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5 changes: 3 additions & 2 deletions lib/web/websocket/receiver.js
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,8 @@ const { WebsocketFrameSend } = require('./frame')
// Copyright (c) 2013 Arnout Kazemier and contributors
// Copyright (c) 2016 Luigi Pinca and contributors

const textDecoder = new TextDecoder('utf-8', { fatal: true })

class ByteParser extends Writable {
#buffers = []
#byteOffset = 0
Expand Down Expand Up @@ -322,8 +324,7 @@ class ByteParser extends Writable {
}

try {
// TODO: optimize this
reason = new TextDecoder('utf-8', { fatal: true }).decode(reason)
reason = textDecoder.decode(reason)
} catch {
return null
}
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4 changes: 3 additions & 1 deletion lib/web/websocket/util.js
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Original file line number Diff line number Diff line change
Expand Up @@ -55,6 +55,8 @@ function fireEvent (e, target, eventConstructor = Event, eventInitDict = {}) {
target.dispatchEvent(event)
}

const textDecoder = new TextDecoder('utf-8', { fatal: true })

/**
* @see https://websockets.spec.whatwg.org/#feedback-from-the-protocol
* @param {import('./websocket').WebSocket} ws
Expand All @@ -74,7 +76,7 @@ function websocketMessageReceived (ws, type, data) {
// -> type indicates that the data is Text
// a new DOMString containing data
try {
dataForEvent = new TextDecoder('utf-8', { fatal: true }).decode(data)
dataForEvent = textDecoder.decode(data)
} catch {
failWebsocketConnection(ws, 'Received invalid UTF-8 in text frame.')
return
Expand Down