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websocket: pre-calculated length #3284

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merged 1 commit into from
May 21, 2024
Merged

websocket: pre-calculated length #3284

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9 changes: 7 additions & 2 deletions lib/web/websocket/receiver.js
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@ const {
failWebsocketConnection,
websocketMessageReceived,
utf8Decode,
bufferConcat,
isControlFrame,
isTextBinaryFrame,
isContinuationFrame
Expand All @@ -33,6 +34,7 @@ class ByteParser extends Writable {

#info = {}
#fragments = []
#fragmentsBytes = 0

/** @type {Map<string, PerMessageDeflate>} */
#extensions
Expand Down Expand Up @@ -208,15 +210,17 @@ class ByteParser extends Writable {
} else {
if (!this.#info.compressed) {
this.#fragments.push(body)
this.#fragmentsBytes += body.length

// If the frame is not fragmented, a message has been received.
// If the frame is fragmented, it will terminate with a fin bit set
// and an opcode of 0 (continuation), therefore we handle that when
// parsing continuation frames, not here.
if (!this.#info.fragmented && this.#info.fin) {
const fullMessage = Buffer.concat(this.#fragments)
const fullMessage = bufferConcat(this.#fragments, this.#fragmentsBytes)
websocketMessageReceived(this.ws, this.#info.binaryType, fullMessage)
this.#fragments.length = 0
this.#fragmentsBytes = 0
}

this.#state = parserStates.INFO
Expand All @@ -236,12 +240,13 @@ class ByteParser extends Writable {
return
}

websocketMessageReceived(this.ws, this.#info.binaryType, Buffer.concat(this.#fragments))
websocketMessageReceived(this.ws, this.#info.binaryType, bufferConcat(this.#fragments, this.#fragmentsBytes))

this.#loop = true
this.#state = parserStates.INFO
this.run(callback)
this.#fragments.length = 0
this.#fragmentsBytes = 0
})

this.#loop = false
Expand Down
24 changes: 24 additions & 0 deletions lib/web/websocket/util.js
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Original file line number Diff line number Diff line change
Expand Up @@ -294,6 +294,29 @@ const utf8Decode = hasIntl
throw new TypeError('Invalid utf-8 received.')
}

function bufferConcat (buffers, length) {
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Avoid instance assertion in Buffer.concat.

if (buffers.length === 0 || length === 0) {
return Buffer.allocUnsafe(0)
}
let offset = 0
if (length === undefined) {
length = 0
for (let i = 0; i < buffers.length; ++i) {
length += buffers[i].length
}
}
const output = Buffer.allocUnsafe(length)
for (let i = 0; i < buffers.length; ++i) {
const buffer = buffers[i]
output.set(buffer, offset)
offset += buffer.length
}
if (offset < length) {
output.fill(0, offset, length)
}
return output
}

module.exports = {
isConnecting,
isEstablished,
Expand All @@ -305,6 +328,7 @@ module.exports = {
failWebsocketConnection,
websocketMessageReceived,
utf8Decode,
bufferConcat,
isControlFrame,
isContinuationFrame,
isTextBinaryFrame,
Expand Down
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