/proc/self/root/var/runtime/node_modules/@aws-sdk/node_modules/ws/lib
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/* eslint no-unused-vars: ["error", { "varsIgnorePattern": "^WebSocket$" }] */'use strict'; const WebSocket = require('./websocket');const { Duplex } = require('stream'); /** * Emits the `'close'` event on a stream. * * @param {Duplex} stream 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. * * @param {Error} err The error * @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 {Duplex} The duplex stream * @public */function createWebSocketStream(ws, options) { let terminateOnDestroy = true; const duplex = new Duplex({ ...options, autoDestroy: false, emitClose: false, objectMode: false, writableObjectMode: false }); ws.on('message', function message(msg, isBinary) { const data = !isBinary && duplex._readableState.objectMode ? msg.toString() : msg; if (!duplex.push(data)) ws.pause(); }); ws.once('error', function error(err) { if (duplex.destroyed) return; // Prevent `ws.terminate()` from being called by `duplex._destroy()`. // // - If the `'error'` event is emitted before the `'open'` event, then // `ws.terminate()` is a noop as no socket is assigned. // - Otherwise, the error is re-emitted by the listener of the `'error'` // event of the `Receiver` object. The listener already closes the // connection by calling `ws.close()`. This allows a close frame to be // sent to the other peer. If `ws.terminate()` is called right after this, // then the close frame might not be sent. terminateOnDestroy = false; 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; } let called = false; ws.once('error', function error(err) { called = true; callback(err); }); ws.once('close', function close() { if (!called) callback(err); process.nextTick(emitClose, duplex); }); if (terminateOnDestroy) ws.terminate(); }; duplex._final = function (callback) { if (ws.readyState === ws.CONNECTING) { ws.once('open', function open() { duplex._final(callback); }); return; } // If the value of the `_socket` property is `null` it means that `ws` is a // client websocket and the handshake failed. In fact, when this happens, a // socket is never assigned to the websocket. Wait for the `'error'` event // that will be emitted by the websocket. if (ws._socket === null) return; if (ws._socket._writableState.finished) { callback(); if (duplex._readableState.endEmitted) duplex.destroy(); } 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.isPaused) ws.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;