added ability to take heap snapshots

package.json

@@ -30,6 +30,7 @@
     "express-session": "^1.8.2",
     "gm": "1.16.0",
     "gravatar": "^1.1.0",
+    "heapdump": "^0.3.0",
     "less": "^1.7.5",
     "logrotate-stream": "^0.2.3",
     "mkdirp": "~0.5.0",

src/socket.io/admin.js

@@ -299,4 +299,8 @@ SocketAdmin.getVoters = function(socket, pid, callback) {
 	});
 };
 
+SocketAdmin.takeHeapSnapshot = function(socket, data, callback) {
+	require('heapdump').writeSnapshot(callback);
+};
+
 module.exports = SocketAdmin;

src/views/admin/development/logger.tpl

@@ -31,6 +31,13 @@
 				</form>
 			</div>
 		</div>
+
+		<div class="panel panel-default">
+			<div class="panel-heading">Heap Snapshot</div>
+			<div class="panel-body">
+				<button class="btn btn-primary" id="heap-snapshot">Take Heap Snapshot</button>
+			</div>
+		</div>
 	</div>
 
 	<div class="col-lg-3">
@@ -47,5 +54,14 @@
 <script>
 	require(['admin/settings'], function(Settings) {
 		Settings.prepare();
+
+		$('#heap-snapshot').on('click', function() {
+			socket.emit('admin.takeHeapSnapshot', function(err, filename) {
+				if (err) {
+					return app.alertError(err.message);
+				}
+				app.alertSuccess('Heap Snapshot saved! ' + filename);
+			});
+		})
 	});
 </script>