Add initial clustering support.

grpc_sessions.proto

@@ -0,0 +1,49 @@
+/**
+ * Standalone signaling server for the Nextcloud Spreed app.
+ * Copyright (C) 2022 struktur AG
+ *
+ * @author Joachim Bauch <bauch@struktur.de>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+syntax = "proto3";
+
+option go_package = "github.com/strukturag/nextcloud-spreed-signaling;signaling";
+
+package signaling;
+
+service RpcSessions {
+  rpc LookupSessionId(LookupSessionIdRequest) returns (LookupSessionIdReply) {}
+  rpc IsSessionInCall(IsSessionInCallRequest) returns (IsSessionInCallReply) {}
+}
+
+message LookupSessionIdRequest {
+  string roomSessionId = 1;
+}
+
+message LookupSessionIdReply {
+  string sessionId = 1;
+}
+
+message IsSessionInCallRequest {
+  string sessionId = 1;
+  string roomId = 2;
+  string backendUrl = 3;
+}
+
+message IsSessionInCallReply {
+  bool inCall = 1;
+}