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globals/message_bus.gd

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+extends Node
+
+
+var message_types: Dictionary[String, Array] = {}
+
+
+func subscribe(id: String, callback: Callable) -> void:
+	if not message_types.has(id):
+		message_types.set(id, Array())
+
+	message_types.get(id).append(callback)
+
+
+func clear_voided_listeners() -> void:
+	for mtype in message_types.keys():
+		var mlisteners: Array = message_types.get(mtype)
+		for mlistener in mlisteners:
+			if mlistener.is_valid(): continue
+			mlisteners.erase(mlistener)
+
+
+func emit_local(id: String, data: Variant, expand: bool = false) -> void:
+	emit_propagation(id, data, expand)
+
+
+# TODO: Need to actually validate client request. Also, message bus is more
+#       about server talking to clients than clients to server. I.E, reducing
+#       the number of needed @rpc method decorator bindings.
+@rpc("any_peer", "call_remote", "reliable")
+func emit_request(id: String, data: Variant, expand: bool = false) -> void:
+	if not multiplayer.is_server(): return
+	if not message_types.has(id):
+		push_error("'%s' not an existing message type to handle...", [id])
+		return
+
+	emit_propagation(id, data, expand)
+
+@rpc("authority", "call_local", "reliable")
+func emit_propagation(id: String, data: Variant, expand: bool = false) -> void:
+	if not message_types.has(id):
+		push_error("'%s' not an existing message type to handle...", [id])
+		return
+
+	for callback: Callable in message_types.get(id):
+		if data == null:
+			callback.call()
+			continue
+
+		if not expand:
+			callback.call(data)
+		else:
+			callback.callv(data)
+
+@rpc("authority", "call_remote", "reliable")
+func emit_propagation_clients_only(id: String, data: Variant, expand: bool = false) -> void:
+	if not message_types.has(id):
+		push_error("'%s' not an existing message type to handle...", [id])
+		return
+
+	for callback: Callable in message_types.get(id):
+		if data == null:
+			callback.call()
+			continue
+
+		if not expand:
+			callback.call(data)
+		else:
+			callback.callv(data)