Add support for promises

README.md

@@ -14,18 +14,30 @@ Usage from Node.js
 npm install gamedig
 ```
 
+Promise:
 ```javascript
 var Gamedig = require('gamedig');
-Gamedig.query(
-	{
-		type: 'minecraft',
-		host: 'mc.example.com'
-	},
-	function(state) {
-		if(state.error) console.log("Server is offline");
-		else console.log(state);
-	}
-);
+Gamedig.query({
+	type: 'minecraft',
+	host: 'mc.example.com'
+}).then((state) => {
+	console.log(state);
+}).catch((error) => {
+	console.log("Server is offline");
+});
+```
+
+or Node.JS Callback:
+```javascript
+var Gamedig = require('gamedig');
+Gamedig.query({
+	type: 'minecraft',
+	host: 'mc.example.com'
+},
+function(e,state) {
+	if(e) console.log("Server is offline");
+	else console.log(state);
+});
 ```
 
 > Is NPM out of date? If you're feeling lucky, you can install the latest code with
@@ -40,14 +52,9 @@ Gamedig.query(
 * **port**: (optional) Uses the protocol default if not set
 * **notes**: (optional) Passed through to output
 
-###Callback Function
+### Return Value
 
-The callback function is "guaranteed" to be called exactly once.
-
-If an error occurs, the returned object will contain an "error" key, indicating the issue.
-If the error key exists, it should be assumed that the game server is offline or unreachable.
-
-Otherwise, the returned object is guaranteed to contain the following keys:
+The returned state object will contain the following keys:
 
 **Stable, always present:**
 
@@ -70,7 +77,7 @@ Some servers may return an additional player count number, which may be present
 Games List
 ---
 
-###Supported
+### Supported
 <!--- BEGIN GENERATED GAMES -->
 
 * 7 Days to Die (7d2d) [[Separate Query Port](#separate-query-port)]
@@ -305,7 +312,7 @@ Games List
 
 <!--- END GENERATED GAMES -->
 
-###Not supported (yet)
+### Not supported (yet)
 
 * rFactor Engine (rfactor):
  * rFactor

bin/gamedig.js

@@ -22,13 +22,19 @@ for(var key in argv) {
 var Gamedig = require('../lib/index');
 if(debug) Gamedig.debug = true;
 Gamedig.isCommandLine = true;
-Gamedig.query(
-	options,
-	function(state) {
+
+Gamedig.query(options)
+	.then((state) => {
 		if(outputFormat == 'pretty') {
 			console.log(JSON.stringify(state,null,'  '));
 		} else {
 			console.log(JSON.stringify(state));
 		}
-	}
-);
+	})
+	.catch((error) => {
+		if(outputFormat == 'pretty') {
+			console.log(JSON.stringify({error:error},null,'  '));
+		} else {
+			console.log(JSON.stringify({error:error}));
+		}
+	});

lib/index.js

@@ -29,50 +29,67 @@ udpSocket.on('error', function(e) {
 Gamedig = {
 
 	query: function(options,callback) {
-		if(callback) options.callback = callback;
+		const promise = new Promise((resolve,reject) => {
+			options.callback = (state) => {
+				if (state.error) reject(state.error);
+				else resolve(state);
+			};
 
-		var query;
-		try {
-			query = TypeResolver.lookup(options.type);
-		} catch(e) {
-			process.nextTick(function() {
-				callback({error:e.message});
-			});
-			return;
-		}
-		query.debug = Gamedig.debug;
-		query.udpSocket = udpSocket;
-		query.type = options.type;
-		
-		if(!('port' in query.options) && ('port_query' in query.options)) {
-			if(Gamedig.isCommandLine) {
-				process.stderr.write(
-					"Warning! This game is so old, that we don't know"
-					+" what the server's connection port is. We've guessed that"
-					+" the query port for "+query.type+" is "+query.options.port_query+"."
-					+" If you know the connection port for this type of server, please let"
-					+" us know on the GameDig issue tracker, thanks!\n"
-				);
+			var query;
+			try {
+				query = TypeResolver.lookup(options.type);
+			} catch(e) {
+				process.nextTick(function() {
+					options.callback({error:e.message});
+				});
+				return;
+			}
+			query.debug = Gamedig.debug;
+			query.udpSocket = udpSocket;
+			query.type = options.type;
+
+			if(!('port' in query.options) && ('port_query' in query.options)) {
+				if(Gamedig.isCommandLine) {
+					process.stderr.write(
+						"Warning! This game is so old, that we don't know"
+						+" what the server's connection port is. We've guessed that"
+						+" the query port for "+query.type+" is "+query.options.port_query+"."
+						+" If you know the connection port for this type of server, please let"
+						+" us know on the GameDig issue tracker, thanks!\n"
+					);
+				}
+				query.options.port = query.options.port_query;
+				delete query.options.port_query;
+			}
+
+			// copy over options
+			for(var i in options) query.options[i] = options[i];
+
+			activeQueries.push(query);
+
+			query.on('finished',function(state) {
+				var i = activeQueries.indexOf(query);
+				if(i >= 0) activeQueries.splice(i, 1);
+			});
+
+			process.nextTick(function() {
+				query.start();
+			});
+		});
+
+		if (callback && callback instanceof Function) {
+			if(callback.length == 2) {
+				promise
+					.then((state) => callback(null,state))
+					.catch((error) => callback(error));
+			} else if (callback.length == 1) {
+				promise
+					.then((state) => callback(state))
+					.catch((error) => callback({error:error}));
 			}
-			query.options.port = query.options.port_query;
-			delete query.options.port_query;
 		}
-		
-		// copy over options
-		for(var i in options) query.options[i] = options[i];
 
-		activeQueries.push(query);
-
-		query.on('finished',function(state) {
-			var i = activeQueries.indexOf(query);
-			if(i >= 0) activeQueries.splice(i, 1);
-		});
-		
-		process.nextTick(function() {
-			query.start();
-		});
-
-		return query;
+		return promise;
 	}
 
 };

package.json

@@ -11,7 +11,7 @@
 	],
 	"main": "lib/index.js",
 	"author": "Michael Morrison",
-	"version": "0.2.25",
+	"version": "0.2.26",
 	"repository" : {
 		"type" : "git",
 		"url" : "https://github.com/sonicsnes/node-gamedig.git"
@@ -19,12 +19,10 @@
 	"bugs" : {
 		"url" : "https://github.com/sonicsnes/node-gamedig/issues"
 	},
-	"licenses" : [
-		{
-			"type" : "MIT",
-			"url" : "https://raw.github.com/sonicsnes/node-gamedig/master/LICENSE"
-		}
-	],
+	"license" : "MIT",
+	"engines" : {
+		"node" : ">=4.0.0"
+	},
 	"dependencies": {
 		"iconv-lite": "~0.4.6",
 		"long": "~2.2.3",