[Net] Modularize multiplayer, expose MultiplayerAPI to extensions.

- RPC configurations are now dictionaries.
- Script.get_rpc_methods renamed to Script.get_rpc_config.
- Node.rpc[_id] and Callable.rpc now return an Error.
- Refactor MultiplayerAPI to allow extension.
- New MultiplayerAPI.rpc method with Array argument (for scripts).
- Move the default MultiplayerAPI implementation to a module.

1 files changed, 10 insertions, 18 deletions

diff --git a/modules/gdscript/gdscript.cpp b/modules/gdscript/gdscript.cpp
index a34bf6ef82..0216a710d7 100644
--- a/modules/gdscript/gdscript.cpp
+++ b/modules/gdscript/gdscript.cpp
@@ -954,8 +954,8 @@ void GDScript::get_members(HashSet<StringName> *p_members) {
 	}
 }
 
-const Vector<Multiplayer::RPCConfig> GDScript::get_rpc_methods() const {
-	return rpc_functions;
+const Variant GDScript::get_rpc_config() const {
+	return rpc_config;
 }
 
 Variant GDScript::callp(const StringName &p_method, const Variant **p_args, int p_argcount, Callable::CallError &r_error) {
@@ -1212,9 +1212,9 @@ void GDScript::_save_orphaned_subclasses() {
 
 void GDScript::_init_rpc_methods_properties() {
 	// Copy the base rpc methods so we don't mask their IDs.
-	rpc_functions.clear();
+	rpc_config.clear();
 	if (base.is_valid()) {
-		rpc_functions = base->rpc_functions;
+		rpc_config = base->rpc_config.duplicate();
 	}
 
 	GDScript *cscript = this;
@@ -1222,12 +1222,9 @@ void GDScript::_init_rpc_methods_properties() {
 	while (cscript) {
 		// RPC Methods
 		for (KeyValue<StringName, GDScriptFunction *> &E : cscript->member_functions) {
-			Multiplayer::RPCConfig config = E.value->get_rpc_config();
-			if (config.rpc_mode != Multiplayer::RPC_MODE_DISABLED) {
-				config.name = E.value->get_name();
-				if (rpc_functions.find(config) == -1) {
-					rpc_functions.push_back(config);
-				}
+			Variant config = E.value->get_rpc_config();
+			if (config.get_type() != Variant::NIL) {
+				rpc_config[E.value->get_name()] = config;
 			}
 		}
 
@@ -1241,9 +1238,6 @@ void GDScript::_init_rpc_methods_properties() {
 			cscript = nullptr;
 		}
 	}
-
-	// Sort so we are 100% that they are always the same.
-	rpc_functions.sort_custom<Multiplayer::SortRPCConfig>();
 }
 
 GDScript::~GDScript() {
@@ -1408,9 +1402,7 @@ bool GDScriptInstance::get(const StringName &p_name, Variant &r_ret) const {
 			while (sl) {
 				HashMap<StringName, GDScriptFunction *>::ConstIterator E = sl->member_functions.find(p_name);
 				if (E) {
-					Multiplayer::RPCConfig config;
-					config.name = p_name;
-					if (sptr->rpc_functions.find(config) != -1) {
+					if (sptr->rpc_config.has(p_name)) {
 						r_ret = Callable(memnew(GDScriptRPCCallable(this->owner, E->key)));
 					} else {
 						r_ret = Callable(this->owner, E->key);
@@ -1629,8 +1621,8 @@ ScriptLanguage *GDScriptInstance::get_language() {
 	return GDScriptLanguage::get_singleton();
 }
 
-const Vector<Multiplayer::RPCConfig> GDScriptInstance::get_rpc_methods() const {
-	return script->get_rpc_methods();
+const Variant GDScriptInstance::get_rpc_config() const {
+	return script->get_rpc_config();
 }
 
 void GDScriptInstance::reload_members() {