Configurable rates, handle ping exceptions, Mojang service tracking

app.js

@@ -1,6 +1,7 @@
 var server = require('./lib/server');
 var ping = require('./lib/ping');
 var logger = require('./lib/logger');
+var mojang = require('./lib/mojang_services');
 
 var config = require('./config.json');
 
@@ -13,10 +14,10 @@ function pingAll() {
 	for (var i = 0; i < servers.length; i++) {
 		// Make sure we lock our scope.
 		(function(network) {
-			ping.ping(network.ip, network.port, network.type, 2500, function(err, res) {
+			ping.ping(network.ip, network.port, network.type, config.rates.connectTimeout, function(err, res) {
 				// Handle our ping results, if it succeeded.
 				if (err) {
-					logger.log('error', 'Failed to ping ' + network.ip + ': ' + err);
+					logger.log('error', 'Failed to ping ' + network.ip + ': ' + JSON.stringify(err));
 				}
 
 				server.io.sockets.emit('update', res);
@@ -47,6 +48,23 @@ function pingAll() {
 	}
 }
 
+// Start our main loop that does everything.
+function startMainLoop() {
+	setInterval(pingAll, config.rates.pingAll);
+
+	setInterval(function() {
+		mojang.update(config.rates.mojangStatusTimeout);
+
+		server.io.sockets.emit('updateMojangServices', mojang.toMessage());
+	}, config.rates.upateMojangStatus);
+
+	// Manually fire the first round of our tasks.
+	mojang.update(config.rates.mojangStatusTimeout);
+	server.io.sockets.emit('updateMojangServices', mojang.toMessage());
+
+	pingAll();
+}
+
 server.start(function() {
 	// Track how many people are currently connected.
 	server.io.on('connect', function(client) {
@@ -74,8 +92,5 @@ server.start(function() {
 		});
 	});
 
-	// Start our main loop that fires off pings.
-	setInterval(pingAll, 2500);
-
-	pingAll();
+	startMainLoop();
 });

config.json

@@ -30,5 +30,11 @@
 	"site": {
 		"port": 80,
 		"ip": "0.0.0.0"
+	},
+	"rates": {
+		"upateMojangStatus": 5000,
+		"mojangStatusTimeout": 3500,
+		"pingAll": 2500,
+		"connectTimeout": 2500
 	}
 }

lib/mojang_services.js

@@ -0,0 +1,80 @@
+var request = require('request');
+
+var logger = require('./logger');
+
+var serviceNameLookup = {
+	'minecraft.net': 'Website',
+	'sessionserver.mojang.com': 'Sessions',
+	'authserver.mojang.com': 'Auth',
+	'textures.minecraft.net': 'Skins',
+	'api.mojang.com': 'API'
+};
+
+var serviceStates = {
+	// Lazy populated.
+};
+
+function updateService(name, status) {
+	// Only update if we need to.
+	if (!(name in serviceStates) || serviceStates[name].status !== status) {
+		var newEntry = {
+			name: serviceNameLookup[name], // Send the clean name, not the URL.
+			status: status
+		};
+
+		// If it's an outage, track when it started.
+		if (status === 'yellow'|| status === 'red') {
+			newEntry.startTime = (new Date).getTime();
+		}
+
+		// Generate a nice title from the color.
+		if (status === 'green') {
+			newEntry.title = 'Online';
+		} else if (status === 'yellow') {
+			newEntry.title = 'Unstable';
+		} else if (status === 'red') {
+			newEntry.title = 'Offline';
+		} else {
+			throw new Error('Unknown Mojang status: ' + status);
+		}
+
+		// Wipe the old status in favor of the new one.
+		serviceStates[name] = newEntry;
+	}
+}
+
+exports.update = function(timeout) {
+	request({
+		uri: 'http://status.mojang.com/check',
+		method: 'GET',
+		timeout: timeout
+	}, function(err, res, body) {
+		if (err) {
+			logger.log('error', 'Failed to update Mojang services: %s', JSON.stringify(err));
+		} else {
+			try {
+				body = JSON.parse(body);
+
+				for (var i = 0; i < body.length; i++) {
+					var service = body[i];
+					var name = Object.keys(service)[0]; // Because they return an array of object, we have to do this :(
+
+					// If it's not in the lookup, we don't care about it.
+					if (name in serviceNameLookup) {
+						updateService(name, service[name]);
+					}
+				}
+
+				logger.log('debug', 'Updated Mojang services: %s', JSON.stringify(serviceStates));
+			} catch(err) {
+				// Catch anything weird that can happen, since things probably will.
+				logger.log('error', 'Failed to parse Mojang\'s response: %s', JSON.stringify(err));
+			}
+		}
+	});
+};
+
+exports.toMessage = function() {
+	// This is what we send to the clients.
+	return serviceStates;
+};

lib/ping.js

@@ -5,6 +5,8 @@ var mcpc_ping = require('mc-ping-updated');
 function pingMinecraftPC(host, port, timeout, callback) {
 	var milliseconds = (new Date).getTime();
 
+	// Try catch incase the down stream module is bad at handling exceptions.
+	try {
 		mcpc_ping(host, port, function(err, res) {
 		    if (err) {
 		        callback(err, null);
@@ -20,12 +22,17 @@ function pingMinecraftPC(host, port, timeout, callback) {
 				});
 		    }
 		}, timeout);	
+	} catch (err) {
+		callback(err, null);
+	}
 }
 
 // This is a wrapper function for mcpe-ping, mainly used to convert the data structure of the result.
 function pingMinecraftPE(host, port, timeout, callback) {
 	var milliseconds = (new Date).getTime();
 		
+	// Try catch incase the down stream module is bad at handling exceptions.
+	try {
 		mcpe_ping(host, port || 19132, function(err, res) {
 			if (err) {
 				callback(err, null);
@@ -41,6 +48,9 @@ function pingMinecraftPE(host, port, timeout, callback) {
 				});
 			}
 		}, timeout);
+	} catch (err) {
+		callback(err, null);
+	}
 }
 
 exports.ping = function(host, port, type, timeout, callback) {

package.json

@@ -7,6 +7,7 @@
     "mc-ping-updated": "0.0.6",
     "mcpe-ping": "0.0.3",
     "mime": "^1.3.4",
+    "request": "^2.65.0",
     "socket.io": "^1.3.7",
     "winston": "^2.0.0"
   },