Implement mod communication channels (#6351)

Implement network communication for channels

* Implement ModChannel manager server side to route incoming messages from clients to other clients
* Add signal handler switch on client & ModChannelMgr on client to handle channels
* Add Lua API bindings + client packet sending + unittests
* Implement server message sending
* Add callback from received message handler to Lua API using registration method

1 files changed, 7 insertions, 0 deletions

diff --git a/src/gamedef.h b/src/gamedef.h
index e7fe6c4ab..8117319bc 100644
--- a/src/gamedef.h
+++ b/src/gamedef.h
@@ -33,6 +33,7 @@ class MtEventManager;
 class IRollbackManager;
 class EmergeManager;
 class Camera;
+class ModChannel;
 class ModMetadata;
 
 namespace irr { namespace scene {
@@ -78,4 +79,10 @@ public:
 	virtual std::string getModStoragePath() const = 0;
 	virtual bool registerModStorage(ModMetadata *storage) = 0;
 	virtual void unregisterModStorage(const std::string &name) = 0;
+
+	virtual bool joinModChannel(const std::string &channel) = 0;
+	virtual bool leaveModChannel(const std::string &channel) = 0;
+	virtual bool sendModChannelMessage(const std::string &channel,
+		const std::string &message) = 0;
+	virtual ModChannel *getModChannel(const std::string &channel) = 0;
 };