livecodingspace-app/public/lib/gundb/lib/wsp.js

;(function(wsp){
	var Gun = require('../gun')
	, ws = require('ws').Server
	, http = require('./http')
	, url = require('url');
	Gun.on('opt').event(function(gun, opt){
		gun.__.opt.ws = opt.ws = gun.__.opt.ws || opt.ws || {};
		function start(server, port, app){
			if(app && app.use){ app.use(gun.wsp.server) }
			server = gun.__.opt.ws.server = gun.__.opt.ws.server || opt.ws.server || server;
			require('./ws')(gun.wsp.ws = gun.wsp.ws || new ws(gun.__.opt.ws), function(req, res){
				var ws = this;
				req.headers['gun-sid'] = ws.sid = (ws.sid? ws.sid : req.headers['gun-sid']);
				ws.sub = ws.sub || gun.wsp.on('network').event(function(msg){
					if(!ws || !ws.send || !ws._socket || !ws._socket.writable){ return this.off() }
					if(!msg || (ws.sid && msg.headers && msg.headers['gun-sid'] === ws.sid)){ return }
					if(msg && msg.headers){ delete msg.headers['ws-rid'] }
					// TODO: BUG? ^ What if other peers want to ack? Do they use the ws-rid or a gun declared id?
					try{ws.send(Gun.text.ify(msg));
					}catch(e){} // juuuust in case.
				});
				gun.wsp.wire(req, res);
			});
			gun.__.opt.ws.port = gun.__.opt.ws.port || opt.ws.port || port || 80;
		}
		var wsp = gun.wsp = gun.wsp || function(server, auth){
			gun.wsp.auth = auth;
			if(!server){ return gun }
			if(Gun.fns.is(server.address)){
				if(server.address()){
					start(server, server.address().port);
					return gun;
				}
			}
			if(Gun.fns.is(server.get) && server.get('port')){
				start(server, server.get('port'));
				return gun;
			}
			var listen = server.listen;
			server.listen = function(port){
				var serve = listen.apply(server, arguments);
				start(serve, port, server);
				return serve;
			}
			return gun;
		}
		gun.wsp.on = gun.wsp.on || Gun.on.create();
		gun.wsp.regex = gun.wsp.regex || opt.route || opt.path || /^\/gun/i;
		gun.wsp.poll = gun.wsp.poll || opt.poll || 1;
		gun.wsp.pull = gun.wsp.pull || opt.pull || gun.wsp.poll * 1000;
		gun.wsp.server = gun.wsp.server || function(req, res, next){ // http
			next = next || function(){};
			if(!req || !res){ return next(), false }
			if(!req.url){ return next(), false }
			if(!req.method){ return next(), false }
			var msg = {};
			msg.url = url.parse(req.url, true);
			if(!gun.wsp.regex.test(msg.url.pathname)){ return next(), false } // TODO: BUG! If the option isn't a regex then this will fail!
			if(msg.url.pathname.replace(gun.wsp.regex,'').slice(0,3).toLowerCase() === '.js'){
				res.writeHead(200, {'Content-Type': 'text/javascript'});
				res.end(gun.wsp.js = gun.wsp.js || require('fs').readFileSync(__dirname + '/../gun.js')); // gun server is caching the gun library for the client
				return true;
			}
			return http(req, res, function(req, res){
				if(!req){ return next() }
				var stream, cb = res = require('./jsonp')(req, res);
				if(req.headers && (stream = req.headers['gun-sid'])){
					stream = (gun.wsp.peers = gun.wsp.peers || {})[stream] = gun.wsp.peers[stream] || {sid: stream};
					stream.sub = stream.sub || gun.wsp.on('network').event(function(req){
						if(!stream){ return this.off() } // self cleans up after itself!
						if(!req || (req.headers && req.headers['gun-sid'] === stream.sid)){ return }
						(stream.queue = stream.queue || []).push(req);
						stream.drain(stream.reply);
					});
					cb = function(r){ (r.headers||{}).poll = gun.wsp.poll; res(r) }
					stream.drain = stream.drain || function(res){
						if(!res || !stream || !stream.queue || !stream.queue.length){ return }
						res({headers: {'gun-sid': stream.sid}, body: stream.queue });
						stream.off = setTimeout(function(){ stream = null }, gun.wsp.pull);
						stream.reply = stream.queue = null;
						return true;
					}
					clearTimeout(stream.off);
					if(req.headers.pull){
						if(stream.drain(cb)){ return }
						return stream.reply = cb;
					}
				}
				gun.wsp.wire(req, cb);
			}), true;
		}
		if((gun.__.opt.maxSockets = opt.maxSockets || gun.__.opt.maxSockets) !== false){
			require('https').globalAgent.maxSockets = require('http').globalAgent.maxSockets = gun.__.opt.maxSockets || Infinity;
		}
		gun.wsp.msg = gun.wsp.msg || function(id){
			if(!id){
				return gun.wsp.msg.debounce[id = Gun.text.random(9)] = Gun.time.is(), id;
			}
			clearTimeout(gun.wsp.msg.clear);
			gun.wsp.msg.clear = setTimeout(function(){
				var now = Gun.time.is();
				Gun.obj.map(gun.wsp.msg.debounce, function(t,id){
					if((now - t) < (1000 * 60 * 5)){ return }
					Gun.obj.del(gun.wsp.msg.debounce, id);
				});
			},500);
			if(id = gun.wsp.msg.debounce[id]){
				return gun.wsp.msg.debounce[id] = Gun.time.is(), id;
			}
		};
		gun.wsp.msg.debounce = gun.wsp.msg.debounce || {};
		gun.wsp.wire = gun.wsp.wire || (function(){
			// all streams, technically PATCH but implemented as PUT or POST, are forwarded to other trusted peers
			// except for the ones that are listed in the message as having already been sending to.
			// all states, implemented with GET, are replied to the source that asked for it.
			function flow(req, res){
				if (!req.auth || req.headers.broadcast) {
					gun.wsp.on('network').emit(Gun.obj.copy(req));
				}
				if(req.headers.rid){ return } // no need to process.
				if(Gun.is.lex(req.body)){ return tran.get(req, res) }
				else { return tran.put(req, res) }
			}
			function tran(req, res){
				if(!req || !res || !req.body || !req.headers || !req.headers.id){ return }
				if(gun.wsp.msg(req.headers.id)){ return }
				req.method = (req.body && !Gun.is.lex(req.body))? 'put' : 'get';
				if(gun.wsp.auth){ return gun.wsp.auth(req, function(reply){
					if(!reply.headers){ reply.headers = {} }
					if(!reply.headers['Content-Type']){ reply.headers['Content-Type'] = tran.json }
					if(!reply.rid){ reply.headers.rid = req.headers.id }
					if(!reply.id){ reply.headers.id = gun.wsp.msg() }
					res(reply);
				}, flow) }
				else { return flow(req, res) }
			}
			tran.get = function(req, cb){
				var key = req.url.key
				, reply = {headers: {'Content-Type': tran.json, rid: req.headers.id, id: gun.wsp.msg()}};
				//Gun.log(req);
				// NTS HACK! SHOULD BE ITS OWN ISOLATED MODULE! //
				if(req && req.url && req.url.pathname && req.url.pathname.indexOf('gun.nts') >= 0){
					return cb({headers: reply.headers, body: {time: Gun.time.is() }});
				}
				// NTS END! SHOULD HAVE BEEN ITS OWN MODULE //
				// ALL HACK! SHOULD BE ITS OWN MODULE OR CORE? //
				if(req && req.url && Gun.obj.has(req.url.query, '*')){
					return gun.all(req.url.key + req.url.search, function(err, list){
						cb({headers: reply.headers, body: (err? (err.err? err : {err: err || "Unknown error."}) : list || null ) })
					});
				}
				//Gun.log("GET!", req);
				key = req.body;
				//Gun.log("tran.get", key);
				var opt = {key: false, local: true};
				//gun.get(key, function(err, node){
				(gun.__.opt.wire.get||function(key, cb){cb(null,null)})(key, function(err, node){
					//Gun.log("tran.get", key, "<---", err, node);
					reply.headers.id = gun.wsp.msg();
					if(err || !node){
						if(opt.on && opt.on.off){ opt.on.off() }
						return cb({headers: reply.headers, body: (err? (err.err? err : {err: err || "Unknown error."}) : null)});
					}
					if(Gun.obj.empty(node)){
						if(opt.on && opt.on.off){ opt.on.off() }
						return cb({headers: reply.headers, body: node});
					} // we're out of stuff!
					/*
					(function(chunks){ // FEATURE! Stream chunks if the nodes are large!
						var max = 10, count = 0, soul = Gun.is.node.soul(node);
						if(Object.keys(node).length > max){
							var n = Gun.is.node.soul.ify({}, soul);
							Gun.obj.map(node, function(val, field){
								if(!(++count % max)){
									cb({headers: reply.headers, chunk: n}); // send node chunks
									n = Gun.is.node.soul.ify({}, soul);
								}
								Gun.is.node.state.ify([n, node], field, val);
							});
							if(count % max){ // finish off the last chunk
								cb({headers: reply.headers, chunk: n});
							}
						} else {
							cb({headers: reply.headers, chunk: node}); // send full node
						}
					}([]));
					*/
					cb({headers: reply.headers, chunk: node }); // Use this if you don't want streaming chunks feature.
				}, opt);
			}
			tran.put = function(req, cb){
				// NOTE: It is highly recommended you do your own PUT/POSTs through your own API that then saves to gun manually.
				// This will give you much more fine-grain control over security, transactions, and what not.
				var reply = {headers: {'Content-Type': tran.json, rid: req.headers.id, id: gun.wsp.msg()}};
				if(!req.body){ return cb({headers: reply.headers, body: {err: "No body"}}) }
				//Gun.log("\n\ntran.put ----------------->", req.body);
				if(Gun.is.graph(req.body)){
					if(req.err = Gun.union(gun, req.body, function(err, ctx){ // TODO: BUG? Probably should give me ctx.graph
						if(err){ return cb({headers: reply.headers, body: {err: err || "Union failed."}}) }
						var ctx = ctx || {}; ctx.graph = {};
						Gun.is.graph(req.body, function(node, soul){
							ctx.graph[soul] = gun.__.graph[soul];
						});
						(gun.__.opt.wire.put || function(g,cb){cb("No save.")})(ctx.graph, function(err, ok){
							if(err){ return cb({headers: reply.headers, body: {err: err || "Failed."}}) } // TODO: err should already be an error object?
							cb({headers: reply.headers, body: {ok: ok || "Persisted."}});
							//Gun.log("tran.put <------------------------", ok);
						}, {local: true});
					}).err){ cb({headers: reply.headers, body: {err: req.err || "Union failed."}}) }
				} else {
					cb({headers: reply.headers, body: {err: "Not a valid graph!"}});
				}
			}
			gun.wsp.on('network').event(function(req){
				// TODO: MARK! You should move the networking events to here, not in WSS only.
			});
			tran.json = 'application/json';
			return tran;
		}());
		if(opt.server){
			wsp(opt.server);
		}

		if(gun.wsp.driver){ return }
		var driver = gun.wsp.driver = {};
		var noop = function(){};
		var get = gun.__.opt.wire.get || noop;
		var put = gun.__.opt.wire.put || noop;
		var driver = {
			put: function(graph, cb, opt){
				put(graph, cb, opt);
				opt = opt || {};
				if(opt.local){ return }
				var id = gun.wsp.msg();
				gun.wsp.on('network').emit({ // sent to dynamic peers!
					headers: {'Content-Type': 'application/json', id: id},
					body: graph
				});
				var ropt = {headers:{}, WebSocket: WebSocket};
				ropt.headers.id = id;
				Gun.obj.map(opt.peers || gun.__.opt.peers, function(peer, url){
					Gun.request(url, graph, function(err, reply){
						reply.body = reply.body || reply.chunk || reply.end || reply.write;
						if(err || !reply || (err = reply.body && reply.body.err)){
							return cb({err: Gun.log(err || "Put failed.") });
						}
						cb(null, reply.body);
					}, ropt);
				});
			},
			get: function(lex, cb, opt){
				get(lex, cb, opt);
				opt = opt || {};
				if(opt.local){ return }
				if(!Gun.request){ return console.log("Server could not find default network abstraction.") }
				var ropt = {headers:{}};
				ropt.headers.id = gun.wsp.msg();
				Gun.obj.map(opt.peers || gun.__.opt.peers, function(peer, url){
					Gun.request(url, lex, function(err, reply){
						reply.body = reply.body || reply.chunk || reply.end || reply.write;
						if(err || !reply || (err = reply.body && reply.body.err)){
							return cb({err: Gun.log(err || "Get failed.") });
						}
						cb(null, reply.body);
					}, ropt);
				});
			}
		}
		var WebSocket = require('ws');
		Gun.request.WebSocket = WebSocket;
		Gun.request.createServer(gun.wsp.wire);
		gun.__.opt.wire = driver;
		gun.opt({wire: driver}, true);
	});
}({}));