godot/modules/websocket/library_godot_websocket.js

/*************************************************************************/
/*  library_godot_websocket.js                                           */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/

var GodotWebSocket = {
	// Our socket implementation that forwards events to C++.
	$GodotWebSocket__deps: ['$IDHandler'],
	$GodotWebSocket: {
		// Connection opened, report selected protocol
		_onopen: function(p_id, callback, event) {
			const ref = IDHandler.get(p_id);
			if (!ref) {
				return; // Godot object is gone.
			}
			let c_str = GodotOS.allocString(ref.protocol);
			callback(c_str);
			_free(c_str);
		},

		// Message received, report content and type (UTF8 vs binary)
		_onmessage: function(p_id, callback, event) {
			const ref = IDHandler.get(p_id);
			if (!ref) {
				return; // Godot object is gone.
			}
			var buffer;
			var is_string = 0;
			if (event.data instanceof ArrayBuffer) {
				buffer = new Uint8Array(event.data);
			} else if (event.data instanceof Blob) {
				alert("Blob type not supported");
				return;
			} else if (typeof event.data === "string") {
				is_string = 1;
				var enc = new TextEncoder("utf-8");
				buffer = new Uint8Array(enc.encode(event.data));
			} else {
				alert("Unknown message type");
				return;
			}
			var len = buffer.length*buffer.BYTES_PER_ELEMENT;
			var out = _malloc(len);
			HEAPU8.set(buffer, out);
			callback(out, len, is_string);
			_free(out);
		},

		// An error happened, 'onclose' will be called after this.
		_onerror: function(p_id, callback, event) {
			const ref = IDHandler.get(p_id);
			if (!ref) {
				return; // Godot object is gone.
			}
			callback();
		},

		// Connection is closed, this is always fired. Report close code, reason, and clean status.
		_onclose: function(p_id, callback, event) {
			const ref = IDHandler.get(p_id);
			if (!ref) {
				return; // Godot object is gone.
			}
			let c_str = GodotOS.allocString(event.reason);
			callback(event.code, c_str, event.wasClean ? 1 : 0);
			_free(c_str);
		},

		// Send a message
		send: function(p_id, p_data) {
			const ref = IDHandler.get(p_id);
			if (!ref || ref.readyState != ref.OPEN) {
				return 1; // Godot object is gone or socket is not in a ready state.
			}
			ref.send(p_data);
			return 0;
		},

		create: function(socket, p_on_open, p_on_message, p_on_error, p_on_close) {
			const id = IDHandler.add(socket);
			socket.onopen = GodotWebSocket._onopen.bind(null, id, p_on_open);
			socket.onmessage = GodotWebSocket._onmessage.bind(null, id, p_on_message);
			socket.onerror = GodotWebSocket._onerror.bind(null, id, p_on_error);
			socket.onclose = GodotWebSocket._onclose.bind(null, id, p_on_close);
			return id;
		},

		// Closes the JavaScript WebSocket (if not already closing) associated to a given C++ object.
		close: function(p_id, p_code, p_reason) {
			const ref = IDHandler.get(p_id);
			if (ref && ref.readyState < ref.CLOSING) {
				const code = p_code;
				const reason = UTF8ToString(p_reason);
				ref.close(code, reason);
			}
		},

		// Deletes the reference to a C++ object (closing any connected socket if necessary).
		destroy: function(p_id) {
			const ref = IDHandler.get(p_id);
			if (!ref) {
				return;
			}
			GodotWebSocket.close(p_id, 1001, '');
			IDHandler.remove(p_id);
			ref.onopen = null;
			ref.onmessage = null;
			ref.onerror = null;
			ref.onclose = null;
		},
	},

	godot_js_websocket_create: function(p_ref, p_url, p_proto, p_on_open, p_on_message, p_on_error, p_on_close) {
		const on_open = GodotOS.get_func(p_on_open).bind(null, p_ref);
		const on_message = GodotOS.get_func(p_on_message).bind(null, p_ref);
		const on_error = GodotOS.get_func(p_on_error).bind(null, p_ref);
		const on_close = GodotOS.get_func(p_on_close).bind(null, p_ref);
		const url = UTF8ToString(p_url);
		const protos = UTF8ToString(p_proto);
		var socket = null;
		try {
			if (protos) {
				socket = new WebSocket(url, protos.split(","));
			} else {
				socket = new WebSocket(url);
			}
		} catch (e) {
			return 0;
		}
		socket.binaryType = "arraybuffer";
		return GodotWebSocket.create(socket, on_open, on_message, on_error, on_close);
	},

	godot_js_websocket_send: function(p_id, p_buf, p_buf_len, p_raw) {
		var bytes_array = new Uint8Array(p_buf_len);
		var i = 0;
		for(i = 0; i < p_buf_len; i++) {
			bytes_array[i] = getValue(p_buf + i, 'i8');
		}
		var out = bytes_array.buffer;
		if (!p_raw) {
			out = new TextDecoder("utf-8").decode(bytes_array);
		}
		return GodotWebSocket.send(p_id, out);
	},

	godot_js_websocket_close: function(p_id, p_code, p_reason) {
		const code = p_code;
		const reason = UTF8ToString(p_reason);
		GodotWebSocket.close(p_id, code, reason);
	},

	godot_js_websocket_destroy: function(p_id) {
		GodotWebSocket.destroy(p_id);
	},
};

autoAddDeps(GodotWebSocket, '$GodotWebSocket')
mergeInto(LibraryManager.library, GodotWebSocket);