gun/src/websocket.js

A realtime, decentralized, offline-first, graph data synchronization engine.

var Gun = require('./index');
Gun.Mesh = require('./mesh');

// TODO: resync upon reconnect online/offline
//window.ononline = window.onoffline = function(){ console.log('online?', navigator.onLine) }

Gun.on('opt', function(root){
	this.to.next(root);
	if(root.once){ return }
	var opt = root.opt;
	if(false === opt.WebSocket){ return }

	var env = Gun.window || {};
	var websocket = opt.WebSocket || env.WebSocket || env.webkitWebSocket || env.mozWebSocket;
	if(!websocket){ return }
	opt.WebSocket = websocket;

	var mesh = opt.mesh = opt.mesh || Gun.Mesh(root);

	var wire = mesh.wire || opt.wire;
	mesh.wire = opt.wire = open;
	function open(peer){ try{
		if(!peer || !peer.url){ return wire && wire(peer) }
		var url = peer.url.replace(/^http/, 'ws');
		var wire = peer.wire = new opt.WebSocket(url);
		wire.onclose = function(){
			reconnect(peer);
			opt.mesh.bye(peer);
		};
		wire.onerror = function(err){
			reconnect(peer);
		};
		wire.onopen = function(){
			opt.mesh.hi(peer);
		}
		wire.onmessage = function(msg){
			if(!msg){ return }
			opt.mesh.hear(msg.data || msg, peer);
		};
		return wire;
	}catch(e){ opt.mesh.bye(peer) }}

	setTimeout(function(){ !opt.super && root.on('out', {dam:'hi'}) },1); // it can take a while to open a socket, so maybe no longer lazy load for perf reasons?

	var wait = 2 * 999;
	function reconnect(peer){
		clearTimeout(peer.defer);
		if(!opt.peers[peer.url]){ return }
		if(doc && peer.retry <= 0){ return }
		peer.retry = (peer.retry || opt.retry+1 || 60) - ((-peer.tried + (peer.tried = +new Date) < wait*4)?1:0);
		peer.defer = setTimeout(function to(){
			if(doc && doc.hidden){ return setTimeout(to,wait) }
			open(peer);
		}, wait);
	}
	var doc = (''+u !== typeof document) && document;
});
var noop = function(){}, u;