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[feature] Add support for Blob (#2229)
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Closes #2206
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@lpinca
lpinca committed Jul 2, 2024
1 parent 0d1b5e6 commit 59b9629
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Showing 9 changed files with 775 additions and 93 deletions.
18 changes: 11 additions & 7 deletions doc/ws.md
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Original file line number Diff line number Diff line change
Expand Up @@ -466,10 +466,11 @@ does nothing if `type` is not one of `'close'`, `'error'`, `'message'`, or
- {String}

A string indicating the type of binary data being transmitted by the connection.
This should be one of "nodebuffer", "arraybuffer" or "fragments". Defaults to
"nodebuffer". Type "fragments" will emit the array of fragments as received from
the sender, without copyfull concatenation, which is useful for the performance
of binary protocols transferring large messages with multiple fragments.
This should be one of "nodebuffer", "arraybuffer", "blob", or "fragments".
Defaults to "nodebuffer". Type "fragments" will emit the array of fragments as
received from the sender, without copyfull concatenation, which is useful for
the performance of binary protocols transferring large messages with multiple
fragments.

### websocket.bufferedAmount

Expand Down Expand Up @@ -538,7 +539,8 @@ is a noop if the ready state is `CONNECTING` or `CLOSED`.

### websocket.ping([data[, mask]][, callback])

- `data` {Array|Number|Object|String|ArrayBuffer|Buffer|DataView|TypedArray} The
- `data`
{Array|Number|Object|String|ArrayBuffer|Buffer|DataView|TypedArray|Blob} The
data to send in the ping frame.
- `mask` {Boolean} Specifies whether `data` should be masked or not. Defaults to
`true` when `websocket` is not a server client.
Expand All @@ -550,7 +552,8 @@ Send a ping. This method throws an error if the ready state is `CONNECTING`.

### websocket.pong([data[, mask]][, callback])

- `data` {Array|Number|Object|String|ArrayBuffer|Buffer|DataView|TypedArray} The
- `data`
{Array|Number|Object|String|ArrayBuffer|Buffer|DataView|TypedArray|Blob} The
data to send in the pong frame.
- `mask` {Boolean} Specifies whether `data` should be masked or not. Defaults to
`true` when `websocket` is not a server client.
Expand Down Expand Up @@ -588,7 +591,8 @@ only removes listeners added with

### websocket.send(data[, options][, callback])

- `data` {Array|Number|Object|String|ArrayBuffer|Buffer|DataView|TypedArray} The
- `data`
{Array|Number|Object|String|ArrayBuffer|Buffer|DataView|TypedArray|Blob} The
data to send. `Object` values are only supported if they conform to the
requirements of [`Buffer.from()`][]. If those constraints are not met, a
`TypeError` is thrown.
Expand Down
8 changes: 7 additions & 1 deletion lib/constants.js
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Original file line number Diff line number Diff line change
@@ -1,9 +1,15 @@
'use strict';

const BINARY_TYPES = ['nodebuffer', 'arraybuffer', 'fragments'];
const hasBlob = typeof Blob !== 'undefined';

if (hasBlob) BINARY_TYPES.push('blob');

module.exports = {
BINARY_TYPES: ['nodebuffer', 'arraybuffer', 'fragments'],
BINARY_TYPES,
EMPTY_BUFFER: Buffer.alloc(0),
GUID: '258EAFA5-E914-47DA-95CA-C5AB0DC85B11',
hasBlob,
kForOnEventAttribute: Symbol('kIsForOnEventAttribute'),
kListener: Symbol('kListener'),
kStatusCode: Symbol('status-code'),
Expand Down
2 changes: 2 additions & 0 deletions lib/receiver.js
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Original file line number Diff line number Diff line change
Expand Up @@ -559,6 +559,8 @@ class Receiver extends Writable {
data = concat(fragments, messageLength);
} else if (this._binaryType === 'arraybuffer') {
data = toArrayBuffer(concat(fragments, messageLength));
} else if (this._binaryType === 'blob') {
data = new Blob(fragments);
} else {
data = fragments;
}
Expand Down
197 changes: 151 additions & 46 deletions lib/sender.js
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Original file line number Diff line number Diff line change
Expand Up @@ -6,8 +6,8 @@ const { Duplex } = require('stream');
const { randomFillSync } = require('crypto');

const PerMessageDeflate = require('./permessage-deflate');
const { EMPTY_BUFFER } = require('./constants');
const { isValidStatusCode } = require('./validation');
const { EMPTY_BUFFER, kWebSocket, NOOP } = require('./constants');
const { isBlob, isValidStatusCode } = require('./validation');
const { mask: applyMask, toBuffer } = require('./buffer-util');

const kByteLength = Symbol('kByteLength');
Expand All @@ -16,6 +16,10 @@ const RANDOM_POOL_SIZE = 8 * 1024;
let randomPool;
let randomPoolPointer = RANDOM_POOL_SIZE;

const DEFAULT = 0;
const DEFLATING = 1;
const GET_BLOB_DATA = 2;

/**
* HyBi Sender implementation.
*/
Expand All @@ -42,8 +46,10 @@ class Sender {
this._compress = false;

this._bufferedBytes = 0;
this._deflating = false;
this._queue = [];
this._state = DEFAULT;
this.onerror = NOOP;
this[kWebSocket] = undefined;
}

/**
Expand Down Expand Up @@ -210,7 +216,7 @@ class Sender {
rsv1: false
};

if (this._deflating) {
if (this._state !== DEFAULT) {
this.enqueue([this.dispatch, buf, false, options, cb]);
} else {
this.sendFrame(Sender.frame(buf, options), cb);
Expand All @@ -232,6 +238,9 @@ class Sender {
if (typeof data === 'string') {
byteLength = Buffer.byteLength(data);
readOnly = false;
} else if (isBlob(data)) {
byteLength = data.size;
readOnly = false;
} else {
data = toBuffer(data);
byteLength = data.length;
Expand All @@ -253,7 +262,13 @@ class Sender {
rsv1: false
};

if (this._deflating) {
if (isBlob(data)) {
if (this._state !== DEFAULT) {
this.enqueue([this.getBlobData, data, false, options, cb]);
} else {
this.getBlobData(data, false, options, cb);
}
} else if (this._state !== DEFAULT) {
this.enqueue([this.dispatch, data, false, options, cb]);
} else {
this.sendFrame(Sender.frame(data, options), cb);
Expand All @@ -275,6 +290,9 @@ class Sender {
if (typeof data === 'string') {
byteLength = Buffer.byteLength(data);
readOnly = false;
} else if (isBlob(data)) {
byteLength = data.size;
readOnly = false;
} else {
data = toBuffer(data);
byteLength = data.length;
Expand All @@ -296,7 +314,13 @@ class Sender {
rsv1: false
};

if (this._deflating) {
if (isBlob(data)) {
if (this._state !== DEFAULT) {
this.enqueue([this.getBlobData, data, false, options, cb]);
} else {
this.getBlobData(data, false, options, cb);
}
} else if (this._state !== DEFAULT) {
this.enqueue([this.dispatch, data, false, options, cb]);
} else {
this.sendFrame(Sender.frame(data, options), cb);
Expand Down Expand Up @@ -330,6 +354,9 @@ class Sender {
if (typeof data === 'string') {
byteLength = Buffer.byteLength(data);
readOnly = false;
} else if (isBlob(data)) {
byteLength = data.size;
readOnly = false;
} else {
data = toBuffer(data);
byteLength = data.length;
Expand Down Expand Up @@ -357,40 +384,94 @@ class Sender {

if (options.fin) this._firstFragment = true;

if (perMessageDeflate) {
const opts = {
[kByteLength]: byteLength,
fin: options.fin,
generateMask: this._generateMask,
mask: options.mask,
maskBuffer: this._maskBuffer,
opcode,
readOnly,
rsv1
};

if (this._deflating) {
this.enqueue([this.dispatch, data, this._compress, opts, cb]);
const opts = {
[kByteLength]: byteLength,
fin: options.fin,
generateMask: this._generateMask,
mask: options.mask,
maskBuffer: this._maskBuffer,
opcode,
readOnly,
rsv1
};

if (isBlob(data)) {
if (this._state !== DEFAULT) {
this.enqueue([this.getBlobData, data, this._compress, opts, cb]);
} else {
this.dispatch(data, this._compress, opts, cb);
this.getBlobData(data, this._compress, opts, cb);
}
} else if (this._state !== DEFAULT) {
this.enqueue([this.dispatch, data, this._compress, opts, cb]);
} else {
this.sendFrame(
Sender.frame(data, {
[kByteLength]: byteLength,
fin: options.fin,
generateMask: this._generateMask,
mask: options.mask,
maskBuffer: this._maskBuffer,
opcode,
readOnly,
rsv1: false
}),
cb
);
this.dispatch(data, this._compress, opts, cb);
}
}

/**
* Gets the contents of a blob as binary data.
*
* @param {Blob} blob The blob
* @param {Boolean} [compress=false] Specifies whether or not to compress
* the data
* @param {Object} options Options object
* @param {Boolean} [options.fin=false] Specifies whether or not to set the
* FIN bit
* @param {Function} [options.generateMask] The function used to generate the
* masking key
* @param {Boolean} [options.mask=false] Specifies whether or not to mask
* `data`
* @param {Buffer} [options.maskBuffer] The buffer used to store the masking
* key
* @param {Number} options.opcode The opcode
* @param {Boolean} [options.readOnly=false] Specifies whether `data` can be
* modified
* @param {Boolean} [options.rsv1=false] Specifies whether or not to set the
* RSV1 bit
* @param {Function} [cb] Callback
* @private
*/
getBlobData(blob, compress, options, cb) {
this._bufferedBytes += options[kByteLength];
this._state = GET_BLOB_DATA;

blob
.arrayBuffer()
.then((arrayBuffer) => {
if (this._socket.destroyed) {
const err = new Error(
'The socket was closed while the blob was being read'
);

//
// `callCallbacks` is called in the next tick to ensure that errors
// that might be thrown in the callbacks behave like errors thrown
// outside the promise chain.
//
process.nextTick(callCallbacks, this, err, cb);
return;
}

this._bufferedBytes -= options[kByteLength];
const data = toBuffer(arrayBuffer);

if (!compress) {
this._state = DEFAULT;
this.sendFrame(Sender.frame(data, options), cb);
this.dequeue();
} else {
this.dispatch(data, compress, options, cb);
}
})
.catch((err) => {
//
// `onError` is called in the next tick for the same reason that
// `callCallbacks` above is.
//
process.nextTick(onError, this, err, cb);
});
}

/**
* Dispatches a message.
*
Expand Down Expand Up @@ -423,27 +504,19 @@ class Sender {
const perMessageDeflate = this._extensions[PerMessageDeflate.extensionName];

this._bufferedBytes += options[kByteLength];
this._deflating = true;
this._state = DEFLATING;
perMessageDeflate.compress(data, options.fin, (_, buf) => {
if (this._socket.destroyed) {
const err = new Error(
'The socket was closed while data was being compressed'
);

if (typeof cb === 'function') cb(err);

for (let i = 0; i < this._queue.length; i++) {
const params = this._queue[i];
const callback = params[params.length - 1];

if (typeof callback === 'function') callback(err);
}

callCallbacks(this, err, cb);
return;
}

this._bufferedBytes -= options[kByteLength];
this._deflating = false;
this._state = DEFAULT;
options.readOnly = false;
this.sendFrame(Sender.frame(buf, options), cb);
this.dequeue();
Expand All @@ -456,7 +529,7 @@ class Sender {
* @private
*/
dequeue() {
while (!this._deflating && this._queue.length) {
while (this._state === DEFAULT && this._queue.length) {
const params = this._queue.shift();

this._bufferedBytes -= params[3][kByteLength];
Expand Down Expand Up @@ -495,3 +568,35 @@ class Sender {
}

module.exports = Sender;

/**
* Calls queued callbacks with an error.
*
* @param {Sender} sender The `Sender` instance
* @param {Error} err The error to call the callbacks with
* @param {Function} [cb] The first callback
* @private
*/
function callCallbacks(sender, err, cb) {
if (typeof cb === 'function') cb(err);

for (let i = 0; i < sender._queue.length; i++) {
const params = sender._queue[i];
const callback = params[params.length - 1];

if (typeof callback === 'function') callback(err);
}
}

/**
* Handles a `Sender` error.
*
* @param {Sender} sender The `Sender` instance
* @param {Error} err The error
* @param {Function} [cb] The first pending callback
* @private
*/
function onError(sender, err, cb) {
callCallbacks(sender, err, cb);
sender.onerror(err);
}
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