466 lines
14 KiB
JavaScript
466 lines
14 KiB
JavaScript
///////////////////////////////////////////////////////////////////////////
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// Wire protocol representation of events and actions
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function encodeEvent(e) {
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switch (e.type) {
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case "routes":
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var rs = [];
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for (var i = 0; i < e.routes.length; i++) {
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rs.push(e.routes[i].toJSON());
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}
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return ["routes", rs];
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case "message":
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return ["message", e.message, e.metaLevel, e.isFeedback];
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}
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}
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function decodeAction(j) {
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switch (j[0]) {
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case "routes":
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var rs = [];
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for (var i = 0; i < j[1].length; i++) {
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rs.push(Route.fromJSON(j[1][i]));
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}
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return updateRoutes(rs);
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case "message":
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return sendMessage(j[1], j[2], j[3]);
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default:
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throw { message: "Invalid JSON-encoded action: " + JSON.stringify(j) };
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}
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}
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///////////////////////////////////////////////////////////////////////////
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// Generic Spy
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function Spy() {
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}
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Spy.prototype.boot = function () {
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World.updateRoutes([sub(__, 0, Infinity), pub(__, 0, Infinity)]);
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};
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Spy.prototype.handleEvent = function (e) {
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switch (e.type) {
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case "routes": console.log("SPY", "routes", e.routes); break;
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case "message": console.log("SPY", "message", e.message, e.metaLevel, e.isFeedback); break;
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default: console.log("SPY", "unknown", e); break;
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}
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};
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///////////////////////////////////////////////////////////////////////////
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// JQuery event driver
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function spawnJQueryDriver() {
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var d = new DemandMatcher(["jQuery", __, __, __]);
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d.onDemandIncrease = function (r) {
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var selector = r.pattern[1];
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var eventName = r.pattern[2];
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World.spawn(new JQueryEventRouter(selector, eventName),
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[pub(["jQuery", selector, eventName, __]),
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pub(["jQuery", selector, eventName, __], 0, 1)]);
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};
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World.spawn(d);
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}
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function JQueryEventRouter(selector, eventName) {
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var self = this;
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this.selector = selector;
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this.eventName = eventName;
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this.handler =
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World.wrap(function (e) {
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World.send(["jQuery", self.selector, self.eventName, e]);
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e.preventDefault();
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return false;
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});
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$(this.selector).on(this.eventName, this.handler);
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}
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JQueryEventRouter.prototype.handleEvent = function (e) {
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if (e.type === "routes" && e.routes.length === 0) {
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$(this.selector).off(this.eventName, this.handler);
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World.exit();
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}
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};
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///////////////////////////////////////////////////////////////////////////
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// Wake detector - notices when something (such as
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// suspension/sleeping!) has caused periodic activities to be
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// interrupted, and warns others about it
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// Inspired by http://blog.alexmaccaw.com/javascript-wake-event
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function WakeDetector(period) {
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this.message = "wake";
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this.period = period || 10000;
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this.mostRecentTrigger = +(new Date());
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this.timerId = null;
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}
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WakeDetector.prototype.boot = function () {
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var self = this;
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World.updateRoutes([pub(this.message)]);
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this.timerId = setInterval(World.wrap(function () { self.trigger(); }), this.period);
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};
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WakeDetector.prototype.handleEvent = function (e) {};
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WakeDetector.prototype.trigger = function () {
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var now = +(new Date());
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if (now - this.mostRecentTrigger > this.period * 1.5) {
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World.send(this.message);
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}
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this.mostRecentTrigger = now;
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};
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///////////////////////////////////////////////////////////////////////////
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// WebSocket client driver
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var DEFAULT_RECONNECT_DELAY = 100;
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var MAX_RECONNECT_DELAY = 30000;
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var DEFAULT_IDLE_TIMEOUT = 300000; // 5 minutes
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var DEFAULT_PING_INTERVAL = DEFAULT_IDLE_TIMEOUT - 10000;
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function WebSocketConnection(label, wsurl, shouldReconnect) {
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this.label = label;
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this.wsurl = wsurl;
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this.shouldReconnect = shouldReconnect ? true : false;
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this.reconnectDelay = DEFAULT_RECONNECT_DELAY;
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this.localRoutes = [];
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this.peerRoutes = [];
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this.prevPeerRoutesMessage = null;
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this.sock = null;
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this.deduplicator = new Deduplicator();
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this.activityTimestamp = 0;
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this.idleTimeout = DEFAULT_IDLE_TIMEOUT;
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this.pingInterval = DEFAULT_PING_INTERVAL;
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this.idleTimer = null;
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this.pingTimer = null;
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}
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WebSocketConnection.prototype.clearHeartbeatTimers = function () {
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if (this.idleTimer) { clearTimeout(this.idleTimer); this.idleTimer = null; }
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if (this.pingTimer) { clearTimeout(this.pingTimer); this.pingTimer = null; }
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};
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WebSocketConnection.prototype.recordActivity = function () {
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var self = this;
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this.activityTimestamp = +(new Date());
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this.clearHeartbeatTimers();
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this.idleTimer = setTimeout(function () { self.forceclose(); },
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this.idleTimeout);
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this.pingTimer = setTimeout(function () { self.safeSend(JSON.stringify("ping")) },
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this.pingInterval);
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};
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WebSocketConnection.prototype.statusRoute = function (status) {
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return pub([this.label + "_state", status]);
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};
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WebSocketConnection.prototype.relayRoutes = function () {
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// fresh copy each time, suitable for in-place extension/mutation
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return [this.statusRoute(this.isConnected() ? "connected" : "disconnected"),
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pub([this.label, __, __], 0, 1000),
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sub([this.label, __, __], 0, 1000)];
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};
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WebSocketConnection.prototype.aggregateRoutes = function () {
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var rs = this.relayRoutes();
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for (var i = 0; i < this.peerRoutes.length; i++) {
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var r = this.peerRoutes[i];
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rs.push(new Route(r.isSubscription,
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[this.label, __, r.pattern],
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r.metaLevel,
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r.level));
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}
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// console.log("WebSocketConnection.aggregateRoutes", this.label, rs);
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return rs;
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};
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WebSocketConnection.prototype.boot = function () {
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this.reconnect();
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};
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WebSocketConnection.prototype.trapexit = function () {
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this.forceclose();
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};
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WebSocketConnection.prototype.isConnected = function () {
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return this.sock && this.sock.readyState === this.sock.OPEN;
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};
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WebSocketConnection.prototype.safeSend = function (m) {
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try {
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if (this.isConnected()) { this.sock.send(m); }
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} catch (e) {
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console.warn("Trapped exn while sending", e);
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}
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};
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WebSocketConnection.prototype.sendLocalRoutes = function () {
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this.safeSend(JSON.stringify(encodeEvent(updateRoutes(this.localRoutes))));
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};
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WebSocketConnection.prototype.handleEvent = function (e) {
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// console.log("WebSocketConnection.handleEvent", e);
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switch (e.type) {
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case "routes":
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this.localRoutes = [];
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for (var i = 0; i < e.routes.length; i++) {
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var r = e.routes[i];
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if (r.pattern.length && r.pattern.length === 3
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&& r.pattern[0] === this.label
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&& typeof(r.pattern[1]) === "number")
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{
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this.localRoutes.push(new Route(r.isSubscription,
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r.pattern[2],
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r.pattern[1],
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r.level));
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}
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}
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this.sendLocalRoutes();
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break;
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case "message":
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var m = e.message;
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if (m.length && m.length === 3
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&& m[0] === this.label
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&& typeof(m[1]) === "number")
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{
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var encoded = JSON.stringify(encodeEvent(sendMessage(m[2], m[1], e.isFeedback)));
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if (this.deduplicator.accept(encoded)) {
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this.safeSend(encoded);
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}
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}
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break;
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}
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};
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WebSocketConnection.prototype.forceclose = function (keepReconnectDelay) {
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if (!keepReconnectDelay) {
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this.reconnectDelay = DEFAULT_RECONNECT_DELAY;
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}
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this.clearHeartbeatTimers();
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if (this.sock) {
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console.log("WebSocketConnection.forceclose called");
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this.sock.close();
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this.sock = null;
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}
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};
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WebSocketConnection.prototype.reconnect = function () {
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var self = this;
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this.forceclose(true);
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this.sock = new WebSocket(this.wsurl);
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this.sock.onopen = World.wrap(function (e) { return self.onopen(e); });
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this.sock.onmessage = World.wrap(function (e) { return self.onmessage(e); });
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this.sock.onclose = World.wrap(function (e) { return self.onclose(e); });
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};
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WebSocketConnection.prototype.onopen = function (e) {
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console.log("connected to " + this.sock.url);
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this.reconnectDelay = DEFAULT_RECONNECT_DELAY;
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this.sendLocalRoutes();
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};
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WebSocketConnection.prototype.onmessage = function (wse) {
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// console.log("onmessage", wse);
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this.recordActivity();
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var j = JSON.parse(wse.data);
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if (j === "ping") {
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this.safeSend(JSON.stringify("pong"));
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return;
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} else if (j === "pong") {
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return; // recordActivity already took care of our timers
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}
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var e = decodeAction(j);
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switch (e.type) {
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case "routes":
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if (this.prevPeerRoutesMessage !== wse.data) {
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this.prevPeerRoutesMessage = wse.data;
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this.peerRoutes = e.routes;
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World.updateRoutes(this.aggregateRoutes());
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}
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break;
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case "message":
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if (this.deduplicator.accept(wse.data)) {
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World.send([this.label, e.metaLevel, e.message], 0, e.isFeedback);
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}
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break;
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}
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};
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WebSocketConnection.prototype.onclose = function (e) {
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var self = this;
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console.log("onclose", e);
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// Update routes to give clients some indication of the discontinuity
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World.updateRoutes(this.aggregateRoutes());
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if (this.shouldReconnect) {
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console.log("reconnecting to " + this.wsurl + " in " + this.reconnectDelay + "ms");
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setTimeout(World.wrap(function () { self.reconnect(); }), this.reconnectDelay);
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this.reconnectDelay = this.reconnectDelay * 1.618 + (Math.random() * 1000);
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this.reconnectDelay =
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this.reconnectDelay > MAX_RECONNECT_DELAY
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? MAX_RECONNECT_DELAY + (Math.random() * 1000)
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: this.reconnectDelay;
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}
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};
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///////////////////////////////////////////////////////////////////////////
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// Main
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function chatEvent(nym, status, utterance, stamp) {
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return ["chatEvent", nym, status, utterance, stamp || +(new Date())];
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}
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function chatEventNym(c) { return c[1]; }
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function chatEventStatus(c) { return c[2]; }
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function chatEventUtterance(c) { return c[3]; }
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function chatEventStamp(c) { return c[4]; }
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function outputItem(item) {
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var stamp = $("<span/>").text((new Date()).toGMTString()).addClass("timestamp");
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var item = $("<div/>").append([stamp].concat(item));
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var o = $("#chat_output");
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o.append(item);
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o[0].scrollTop = o[0].scrollHeight;
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return item;
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}
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function updateNymList(rs) {
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var statuses = {};
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for (var i = 0; i < rs.length; i++) {
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var p = rs[i].pattern;
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if (p[0] === "broker" && p[1] === 0 && p[2][0] === "chatEvent") {
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statuses[chatEventNym(p[2])] = chatEventStatus(p[2]);
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}
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}
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var nyms = [];
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for (var nym in statuses) { nyms.push(nym); }
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nyms.sort();
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var container = $("#nymlist");
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container[0].innerHTML = ""; // remove all children
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for (var i = 0; i < nyms.length; i++) {
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var n = $("<span/>").text(nyms[i]).addClass("nym");
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var s = statuses[nyms[i]];
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if (s) {
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container.append($("<div/>").append([n, $("<span/>").text(s).addClass("nym_status")]));
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} else {
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container.append($("<div/>").append(n));
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}
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}
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}
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function outputState(state) {
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outputItem([$("<span/>").text(state).addClass(state).addClass("state")])
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.addClass("state_" + state);
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}
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function outputUtterance(who, what) {
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outputItem([$("<span/>").text(who).addClass("nym"),
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$("<span/>").text(what).addClass("utterance")]).addClass("utterance");
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}
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var G;
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$(document).ready(function () {
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$("#chat_form").submit(function (e) { e.preventDefault(); return false; });
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$("#nym_form").submit(function (e) { e.preventDefault(); return false; });
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if (!($("#nym").val())) { $("#nym").val("nym" + Math.floor(Math.random() * 65536)); }
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G = new Ground(function () {
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console.log('starting ground boot');
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// World.spawn(new Spy());
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spawnJQueryDriver();
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World.spawn(new WakeDetector());
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var wsconn = new WebSocketConnection("broker", $("#wsurl").val(), true);
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World.spawn(wsconn);
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World.spawn({
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// Monitor connection, notifying connectivity changes
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state: "crashed", // start with this to avoid spurious initial message print
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boot: function () {
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World.updateRoutes([sub(["broker_state", __], 0, 1)]);
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},
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handleEvent: function (e) {
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if (e.type === "routes") {
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var newState = (e.routes.length > 0) ? e.routes[0].pattern[1] : "crashed";
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if (this.state != newState) {
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outputState(newState);
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this.state = newState;
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}
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}
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}
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});
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World.spawn({
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// Actual chat functionality
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peers: new PresenceDetector(),
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peerMap: {},
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boot: function () {
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World.updateRoutes(this.subscriptions());
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},
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nym: function () { return $("#nym").val(); },
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currentStatus: function () { return $("#status").val(); },
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subscriptions: function () {
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return [sub("wake"),
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sub(["jQuery", "#send_chat", "click", __]),
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sub(["jQuery", "#nym", "change", __]),
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sub(["jQuery", "#status", "change", __]),
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sub(["jQuery", "#wsurl", "change", __]),
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pub(["broker", 0, chatEvent(this.nym(), this.currentStatus(), __, __)]),
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sub(["broker", 0, chatEvent(__, __, __, __)], 0, 1)];
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},
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handleEvent: function (e) {
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var self = this;
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switch (e.type) {
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case "routes":
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updateNymList(e.routes);
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break;
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case "message":
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if (e.message === "wake") {
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wsconn.forceclose();
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return;
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}
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switch (e.message[0]) {
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case "jQuery":
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switch (e.message[1]) {
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case "#send_chat":
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var inp = $("#chat_input");
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var utterance = inp.val();
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inp.val("");
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if (utterance) {
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World.send(["broker", 0, chatEvent(this.nym(),
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this.currentStatus(),
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utterance)]);
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}
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break;
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case "#nym":
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case "#status":
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World.updateRoutes(this.subscriptions());
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break;
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case "#wsurl":
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wsconn.forceclose();
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wsconn.wsurl = $("#wsurl").val();
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break;
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default:
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console.log("Got jquery event from as-yet-unhandled subscription",
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e.message[2], e.message[3]);
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}
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break;
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case "broker":
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if (e.message[2][0] === "chatEvent") {
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outputUtterance(chatEventNym(e.message[2]),
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chatEventUtterance(e.message[2]));
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}
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break;
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default:
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break;
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}
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break;
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}
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}
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});
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});
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G.startStepping();
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});
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