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'use strict';
const { Duplex } = require('stream');
/**
* Emits the `'close'` event on a stream.
*
* @param {stream.Duplex} The stream.
* @private
*/
function emitClose(stream) {
stream.emit('close');
}
/**
* The listener of the `'end'` event.
*
* @private
*/
function duplexOnEnd() {
if (!this.destroyed && this._writableState.finished) {
this.destroy();
}
}
/**
* The listener of the `'error'` event.
*
* @private
*/
function duplexOnError(err) {
this.removeListener('error', duplexOnError);
this.destroy();
if (this.listenerCount('error') === 0) {
// Do not suppress the throwing behavior.
this.emit('error', err);
}
}
/**
* Wraps a `WebSocket` in a duplex stream.
*
* @param {WebSocket} ws The `WebSocket` to wrap
* @param {Object} options The options for the `Duplex` constructor
* @return {stream.Duplex} The duplex stream
* @public
*/
function createWebSocketStream(ws, options) {
let resumeOnReceiverDrain = true;
function receiverOnDrain() {
if (resumeOnReceiverDrain) ws._socket.resume();
}
if (ws.readyState === ws.CONNECTING) {
ws.once('open', function open() {
ws._receiver.removeAllListeners('drain');
ws._receiver.on('drain', receiverOnDrain);
});
} else {
ws._receiver.removeAllListeners('drain');
ws._receiver.on('drain', receiverOnDrain);
}
const duplex = new Duplex({
...options,
autoDestroy: false,
emitClose: false,
objectMode: false,
readableObjectMode: false,
writableObjectMode: false
});
ws.on('message', function message(msg) {
if (!duplex.push(msg)) {
resumeOnReceiverDrain = false;
ws._socket.pause();
}
});
ws.once('error', function error(err) {
duplex.destroy(err);
});
ws.once('close', function close() {
if (duplex.destroyed) return;
duplex.push(null);
});
duplex._destroy = function(err, callback) {
if (ws.readyState === ws.CLOSED) {
callback(err);
process.nextTick(emitClose, duplex);
return;
}
ws.once('close', function close() {
callback(err);
process.nextTick(emitClose, duplex);
});
ws.terminate();
};
duplex._final = function(callback) {
if (ws.readyState === ws.CONNECTING) {
ws.once('open', function open() {
duplex._final(callback);
});
return;
}
if (ws._socket._writableState.finished) {
if (duplex._readableState.endEmitted) duplex.destroy();
callback();
} else {
ws._socket.once('finish', function finish() {
// `duplex` is not destroyed here because the `'end'` event will be
// emitted on `duplex` after this `'finish'` event. The EOF signaling
// `null` chunk is, in fact, pushed when the WebSocket emits `'close'`.
callback();
});
ws.close();
}
};
duplex._read = function() {
if (ws.readyState === ws.OPEN && !resumeOnReceiverDrain) {
resumeOnReceiverDrain = true;
if (!ws._receiver._writableState.needDrain) ws._socket.resume();
}
};
duplex._write = function(chunk, encoding, callback) {
if (ws.readyState === ws.CONNECTING) {
ws.once('open', function open() {
duplex._write(chunk, encoding, callback);
});
return;
}
ws.send(chunk, callback);
};
duplex.on('end', duplexOnEnd);
duplex.on('error', duplexOnError);
return duplex;
}
module.exports = createWebSocketStream;
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