Allow setting up multiple signaling servers.

Signed-off-by: Joachim Bauch <bauch@struktur.de>

js/signaling.js

@@ -439,8 +439,15 @@
 		}.bind(this));
 	};
 
-	function StandaloneSignaling(settings, url) {
+	function StandaloneSignaling(settings, urls) {
 		SignalingBase.prototype.constructor.apply(this, arguments);
+		if (typeof(urls) === "string") {
+			urls = [urls];
+		}
+		// We can connect to any of the servers.
+		var idx = Math.floor(Math.random() * urls.length);
+		// TODO(jojo): Try other server if connection fails.
+		var url = urls[idx];
 		// Make sure we are using websocket urls.
 		if (url.indexOf("https://") === 0) {
 			url = "wss://" + url.substr(8);
@@ -755,9 +762,9 @@
 		} else {
 			settings = {};
 		}
-		var url = settings['server'];
-		if (url)  {
-			return new StandaloneSignaling(settings, url);
+		var urls = settings['server'];
+		if (urls)  {
+			return new StandaloneSignaling(settings, urls);
 		} else {
 			return new InternalSignaling(settings);
 		}

lib/Config.php

@@ -109,7 +109,11 @@ class Config {
 	 * @return string
 	 */
 	public function getSignalingServer() {
-		return $this->config->getAppValue('spreed', 'signaling_server', '');
+		$server = $this->config->getAppValue('spreed', 'signaling_server', '');
+		if ($server === '') {
+			return [];
+		}
+		return explode('\n', $server);
 	}
 
 	/**

lib/Controller/BackendController.php

@@ -73,6 +73,8 @@ class BackendController extends Controller {
 			return;
 		}
 
+		// We can use any server of the available backends.
+		$signaling = $signaling[array_rand($signaling)];
 		if (substr($signaling, -1) === '/') {
 			$signaling = substr($signaling, 0, strlen($signaling) - 1);
 		}

lib/Controller/SignalingController.php

@@ -90,7 +90,8 @@ class SignalingController extends OCSController {
 	 * @return DataResponse
 	 */
 	public function signaling($messages) {
-		if ($this->config->getSignalingServer() !== '') {
+		$signaling = $this->config->getSignalingServer();
+		if (!empty($signaling)) {
 			throw new \Exception('Internal signaling disabled.');
 		}
 
@@ -124,7 +125,8 @@ class SignalingController extends OCSController {
 	 * @return DataResponse
 	 */
 	public function pullMessages() {
-		if ($this->config->getSignalingServer() !== '') {
+		$signaling = $this->config->getSignalingServer();
+		if (!empty($signaling)) {
 			throw new \Exception('Internal signaling disabled.');
 		}