Initial commit for testing/fixing a deprecated godot-colyseus addon

addons/godot_colyseus/lib/promises.gd

@@ -0,0 +1,107 @@
+extends RefCounted
+
+class Promise: 
+	enum State {
+		Waiting,
+		Success,
+		Failed
+	}
+	var result
+	
+	signal completed
+	
+	var _state: State = State.Waiting
+	
+	func get_state() -> State:
+		return _state
+	
+	func resolve(res = null):
+		if res is Promise:
+			await res.completed
+			result = res.result
+			_state = res.get_state()
+			emit_signal("completed")
+		else:
+			result = res
+			_state = State.Success
+			emit_signal("completed")
+	
+	func reject(error = null):
+		result = error
+		_state = State.Failed
+		emit_signal("completed")
+	
+	var data:get = get_data
+	func get_data():
+		if _state == State.Success:
+			return result
+		return null
+	
+	var error:get = get_error
+	func get_error():
+		if _state == State.Failed:
+			return result
+		return null
+	
+	var is_failed : bool :
+		get():
+			return _state == State.Failed
+			
+	func wait():
+		if _state == State.Waiting:
+			await self.completed
+		return self
+
+	func _to_string():
+		match _state:
+			State.Waiting:
+				return "[Waiting]"
+			State.Success:
+				return str("[Success:",result,"]")
+			State.Failed:
+				return str("[Failed:",result,"]")
+	
+	func _next(promise, callback: Callable, argv: Array):
+		await wait()
+		if _state == State.Success:
+			var arr = [get_data(), promise]
+			arr.append_array(argv)
+			var ret = await callback.callv(arr)
+			promise.resolve(ret)
+	
+	func then(callback: Callable, argv: Array = []) -> Promise:
+		return RunPromise.new(Callable(self, "_next"), [callback, argv])
+
+class FramePromise extends Promise:
+	var cb: Callable
+	var argv: Array
+	
+	func _init(callback: Callable,argv: Array = []):
+		cb = callback
+		self.argv = argv
+		_run()
+	
+	func _run():
+		var root = Engine.get_main_loop()
+		while true:
+			if root is SceneTree:
+				await root.process_frame
+			var arr = [self]
+			arr.append_array(argv)
+			cb.callv(arr)
+			if get_state() != State.Waiting:
+				break
+
+class RunPromise extends Promise:
+	var cb: Callable
+	var argv: Array
+	
+	func _init(callback: Callable,argv: Array = []):
+		cb = callback
+		self.argv = argv
+		_run()
+	
+	func _run():
+		var arr = [self]
+		arr.append_array(argv)
+		await cb.callv(arr)