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357 lines
9.0 KiB
357 lines
9.0 KiB
/*
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* Websock: high-performance binary WebSockets
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* Copyright (C) 2011 Joel Martin
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* Licensed under LGPL-3 (see LICENSE.txt)
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*
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* Websock is similar to the standard WebSocket object but Websock
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* enables communication with raw TCP sockets (i.e. the binary stream)
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* via websockify. This is accomplished by base64 encoding the data
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* stream between Websock and websockify.
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*
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* Websock has built-in receive queue buffering; the message event
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* does not contain actual data but is simply a notification that
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* there is new data available. Several rQ* methods are available to
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* read binary data off of the receive queue.
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*/
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/*jslint browser: true, bitwise: false, plusplus: false */
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/*global Util, Base64 */
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// Load Flash WebSocket emulator if needed
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if (window.WebSocket && !window.WEB_SOCKET_FORCE_FLASH) {
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Websock_native = true;
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} else if (window.MozWebSocket && !window.WEB_SOCKET_FORCE_FLASH) {
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Websock_native = true;
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window.WebSocket = window.MozWebSocket;
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} else {
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/* no builtin WebSocket so load web_socket.js */
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// To enable debug:
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// window.WEB_SOCKET_DEBUG=1;
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Websock_native = false;
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(function () {
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function get_INCLUDE_URI() {
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return (typeof INCLUDE_URI !== "undefined") ?
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INCLUDE_URI : "include/";
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}
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var start = "<script src='" + get_INCLUDE_URI(),
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end = "'><\/script>", extra = "";
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window.WEB_SOCKET_SWF_LOCATION = get_INCLUDE_URI() +
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"web-socket-js/WebSocketMain.swf";
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if (Util.Engine.trident) {
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Util.Debug("Forcing uncached load of WebSocketMain.swf");
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window.WEB_SOCKET_SWF_LOCATION += "?" + Math.random();
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}
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extra += start + "web-socket-js/swfobject.js" + end;
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extra += start + "web-socket-js/web_socket.js" + end;
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document.write(extra);
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}());
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}
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function Websock() {
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"use strict";
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var api = {}, // Public API
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websocket = null, // WebSocket object
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rQ = [], // Receive queue
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rQi = 0, // Receive queue index
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rQmax = 10000, // Max receive queue size before compacting
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sQ = [], // Send queue
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eventHandlers = {
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'message' : function() {},
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'open' : function() {},
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'close' : function() {},
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'error' : function() {}
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},
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test_mode = false;
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//
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// Queue public functions
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//
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function get_sQ() {
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return sQ;
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}
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function get_rQ() {
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return rQ;
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}
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function get_rQi() {
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return rQi;
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}
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function set_rQi(val) {
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rQi = val;
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}
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function rQlen() {
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return rQ.length - rQi;
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}
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function rQpeek8() {
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return (rQ[rQi] );
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}
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function rQshift8() {
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return (rQ[rQi++] );
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}
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function rQunshift8(num) {
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if (rQi === 0) {
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rQ.unshift(num);
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} else {
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rQi -= 1;
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rQ[rQi] = num;
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}
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}
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function rQshift16() {
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return (rQ[rQi++] << 8) +
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(rQ[rQi++] );
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}
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function rQshift32() {
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return (rQ[rQi++] << 24) +
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(rQ[rQi++] << 16) +
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(rQ[rQi++] << 8) +
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(rQ[rQi++] );
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}
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function rQshiftStr(len) {
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if (typeof(len) === 'undefined') { len = rQlen(); }
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var arr = rQ.slice(rQi, rQi + len);
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rQi += len;
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return arr.map(function (num) {
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return String.fromCharCode(num); } ).join('');
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}
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function rQshiftBytes(len) {
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if (typeof(len) === 'undefined') { len = rQlen(); }
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rQi += len;
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return rQ.slice(rQi-len, rQi);
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}
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function rQslice(start, end) {
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if (end) {
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return rQ.slice(rQi + start, rQi + end);
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} else {
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return rQ.slice(rQi + start);
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}
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}
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// Check to see if we must wait for 'num' bytes (default to FBU.bytes)
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// to be available in the receive queue. Return true if we need to
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// wait (and possibly print a debug message), otherwise false.
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function rQwait(msg, num, goback) {
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var rQlen = rQ.length - rQi; // Skip rQlen() function call
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if (rQlen < num) {
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if (goback) {
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if (rQi < goback) {
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throw("rQwait cannot backup " + goback + " bytes");
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}
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rQi -= goback;
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}
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//Util.Debug(" waiting for " + (num-rQlen) +
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// " " + msg + " byte(s)");
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return true; // true means need more data
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}
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return false;
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}
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//
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// Private utility routines
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//
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function encode_message() {
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/* base64 encode */
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return Base64.encode(sQ);
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}
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function decode_message(data) {
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//Util.Debug(">> decode_message: " + data);
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/* base64 decode */
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rQ = rQ.concat(Base64.decode(data, 0));
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//Util.Debug(">> decode_message, rQ: " + rQ);
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}
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//
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// Public Send functions
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//
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function flush() {
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if (websocket.bufferedAmount !== 0) {
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Util.Debug("bufferedAmount: " + websocket.bufferedAmount);
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}
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if (websocket.bufferedAmount < api.maxBufferedAmount) {
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//Util.Debug("arr: " + arr);
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//Util.Debug("sQ: " + sQ);
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if (sQ.length > 0) {
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websocket.send(encode_message(sQ));
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sQ = [];
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}
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return true;
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} else {
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Util.Info("Delaying send, bufferedAmount: " +
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websocket.bufferedAmount);
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return false;
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}
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}
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// overridable for testing
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function send(arr) {
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//Util.Debug(">> send_array: " + arr);
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sQ = sQ.concat(arr);
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return flush();
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}
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function send_string(str) {
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//Util.Debug(">> send_string: " + str);
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api.send(str.split('').map(
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function (chr) { return chr.charCodeAt(0); } ) );
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}
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//
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// Other public functions
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function recv_message(e) {
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//Util.Debug(">> recv_message: " + e.data.length);
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try {
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decode_message(e.data);
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if (rQlen() > 0) {
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eventHandlers.message();
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// Compact the receive queue
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if (rQ.length > rQmax) {
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//Util.Debug("Compacting receive queue");
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rQ = rQ.slice(rQi);
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rQi = 0;
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}
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} else {
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Util.Debug("Ignoring empty message");
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}
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} catch (exc) {
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if (typeof exc.stack !== 'undefined') {
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Util.Warn("recv_message, caught exception: " + exc.stack);
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} else if (typeof exc.description !== 'undefined') {
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Util.Warn("recv_message, caught exception: " + exc.description);
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} else {
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Util.Warn("recv_message, caught exception:" + exc);
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}
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if (typeof exc.name !== 'undefined') {
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eventHandlers.error(exc.name + ": " + exc.message);
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} else {
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eventHandlers.error(exc);
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}
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}
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//Util.Debug("<< recv_message");
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}
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// Set event handlers
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function on(evt, handler) {
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eventHandlers[evt] = handler;
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}
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function init() {
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rQ = [];
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rQi = 0;
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sQ = [];
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websocket = null;
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}
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function open(uri) {
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init();
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if (test_mode) {
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websocket = {};
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} else {
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websocket = new WebSocket(uri, 'base64');
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// TODO: future native binary support
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//websocket = new WebSocket(uri, ['binary', 'base64']);
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}
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websocket.onmessage = recv_message;
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websocket.onopen = function() {
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Util.Debug(">> WebSock.onopen");
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if (websocket.protocol) {
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Util.Info("Server chose sub-protocol: " + websocket.protocol);
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}
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eventHandlers.open();
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Util.Debug("<< WebSock.onopen");
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};
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websocket.onclose = function(e) {
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Util.Debug(">> WebSock.onclose");
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eventHandlers.close(e);
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Util.Debug("<< WebSock.onclose");
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};
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websocket.onerror = function(e) {
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Util.Debug(">> WebSock.onerror: " + e);
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eventHandlers.error(e);
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Util.Debug("<< WebSock.onerror");
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};
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}
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function close() {
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if (websocket) {
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if ((websocket.readyState === WebSocket.OPEN) ||
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(websocket.readyState === WebSocket.CONNECTING)) {
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Util.Info("Closing WebSocket connection");
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websocket.close();
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}
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websocket.onmessage = function (e) { return; };
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}
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}
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// Override internal functions for testing
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// Takes a send function, returns reference to recv function
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function testMode(override_send) {
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test_mode = true;
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api.send = override_send;
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api.close = function () {};
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return recv_message;
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}
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function constructor() {
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// Configuration settings
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api.maxBufferedAmount = 200;
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// Direct access to send and receive queues
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api.get_sQ = get_sQ;
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api.get_rQ = get_rQ;
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api.get_rQi = get_rQi;
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api.set_rQi = set_rQi;
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// Routines to read from the receive queue
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api.rQlen = rQlen;
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api.rQpeek8 = rQpeek8;
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api.rQshift8 = rQshift8;
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api.rQunshift8 = rQunshift8;
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api.rQshift16 = rQshift16;
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api.rQshift32 = rQshift32;
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api.rQshiftStr = rQshiftStr;
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api.rQshiftBytes = rQshiftBytes;
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api.rQslice = rQslice;
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api.rQwait = rQwait;
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api.flush = flush;
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api.send = send;
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api.send_string = send_string;
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api.on = on;
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api.init = init;
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api.open = open;
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api.close = close;
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api.testMode = testMode;
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return api;
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}
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return constructor();
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}
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