godot/modules/websocket/emws_client.cpp

/*************************************************************************/
/*  emws_client.cpp                                                      */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
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#ifdef JAVASCRIPT_ENABLED

#include "emws_client.h"
#include "core/io/ip.h"
#include "core/project_settings.h"
#include "emscripten.h"

extern "C" {
EMSCRIPTEN_KEEPALIVE void _esws_on_connect(void *obj, char *proto) {
	EMWSClient *client = static_cast<EMWSClient *>(obj);
	client->_is_connecting = false;
	client->_on_connect(String(proto));
}

EMSCRIPTEN_KEEPALIVE void _esws_on_message(void *obj, uint8_t *p_data, int p_data_size, int p_is_string) {
	EMWSClient *client = static_cast<EMWSClient *>(obj);

	Error err = static_cast<EMWSPeer *>(*client->get_peer(1))->read_msg(p_data, p_data_size, p_is_string == 1);
	if (err == OK)
		client->_on_peer_packet();
}

EMSCRIPTEN_KEEPALIVE void _esws_on_error(void *obj) {
	EMWSClient *client = static_cast<EMWSClient *>(obj);
	client->_is_connecting = false;
	client->_on_error();
}

EMSCRIPTEN_KEEPALIVE void _esws_on_close(void *obj, int code, char *reason, int was_clean) {
	EMWSClient *client = static_cast<EMWSClient *>(obj);
	client->_on_close_request(code, String(reason));
	client->_is_connecting = false;
	client->_on_disconnect(was_clean != 0);
}
}

Error EMWSClient::connect_to_host(String p_host, String p_path, uint16_t p_port, bool p_ssl, const Vector<String> p_protocols, const Vector<String> p_custom_headers) {
	String proto_string;
	for (int i = 0; i < p_protocols.size(); i++) {
		if (i != 0)
			proto_string += ",";
		proto_string += p_protocols[i];
	}

	String str = "ws://";

	if (p_custom_headers.size()) {
		WARN_PRINT_ONCE("Custom headers are not supported in in HTML5 platform.");
	}
	if (p_ssl) {
		str = "wss://";
		if (ssl_cert.is_valid()) {
			WARN_PRINT_ONCE("Custom SSL certificate is not supported in HTML5 platform.");
		}
	}
	str += p_host + ":" + itos(p_port) + p_path;

	_is_connecting = true;
	/* clang-format off */
	int peer_sock = EM_ASM_INT({
		var proto_str = UTF8ToString($2);
		var socket = null;
		try {
			if (proto_str) {
				socket = new WebSocket(UTF8ToString($1), proto_str.split(","));
			} else {
				socket = new WebSocket(UTF8ToString($1));
			}
		} catch (e) {
			return -1;
		}
		var c_ptr = Module.IDHandler.get($0);
		socket.binaryType = "arraybuffer";

		// Connection opened
		socket.addEventListener("open", function (event) {
			if (!Module.IDHandler.has($0))
				return; // Godot Object is gone!
			ccall("_esws_on_connect",
				"void",
				["number", "string"],
				[c_ptr, socket.protocol]
			);
		});

		// Listen for messages
		socket.addEventListener("message", function (event) {
			if (!Module.IDHandler.has($0))
				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);
			ccall("_esws_on_message",
				"void",
				["number", "number", "number", "number"],
				[c_ptr, out, len, is_string]
			);
			_free(out);
		});

		socket.addEventListener("error", function (event) {
			if (!Module.IDHandler.has($0))
				return; // Godot Object is gone!
			ccall("_esws_on_error",
				"void",
				["number"],
				[c_ptr]
			);
		});

		socket.addEventListener("close", function (event) {
			if (!Module.IDHandler.has($0))
				return; // Godot Object is gone!
			var was_clean = 0;
			if (event.wasClean)
				was_clean = 1;
			ccall("_esws_on_close",
				"void",
				["number", "number", "string", "number"],
				[c_ptr, event.code, event.reason, was_clean]
			);
		});

		return Module.IDHandler.add(socket);
	}, _js_id, str.utf8().get_data(), proto_string.utf8().get_data());
	/* clang-format on */
	if (peer_sock == -1)
		return FAILED;

	static_cast<Ref<EMWSPeer>>(_peer)->set_sock(peer_sock, _in_buf_size, _in_pkt_size);

	return OK;
};

void EMWSClient::poll() {
}

Ref<WebSocketPeer> EMWSClient::get_peer(int p_peer_id) const {
	return _peer;
}

NetworkedMultiplayerPeer::ConnectionStatus EMWSClient::get_connection_status() const {
	if (_peer->is_connected_to_host()) {
		if (_is_connecting)
			return CONNECTION_CONNECTING;
		return CONNECTION_CONNECTED;
	}

	return CONNECTION_DISCONNECTED;
};

void EMWSClient::disconnect_from_host(int p_code, String p_reason) {
	_peer->close(p_code, p_reason);
};

IP_Address EMWSClient::get_connected_host() const {
	ERR_FAIL_V_MSG(IP_Address(), "Not supported in HTML5 export.");
};

uint16_t EMWSClient::get_connected_port() const {
	ERR_FAIL_V_MSG(0, "Not supported in HTML5 export.");
};

int EMWSClient::get_max_packet_size() const {
	return (1 << _in_buf_size) - PROTO_SIZE;
}

Error EMWSClient::set_buffers(int p_in_buffer, int p_in_packets, int p_out_buffer, int p_out_packets) {
	_in_buf_size = nearest_shift(p_in_buffer - 1) + 10;
	_in_pkt_size = nearest_shift(p_in_packets - 1);
	return OK;
}

EMWSClient::EMWSClient() {
	_in_buf_size = DEF_BUF_SHIFT;
	_in_pkt_size = DEF_PKT_SHIFT;

	_is_connecting = false;
	_peer = Ref<EMWSPeer>(memnew(EMWSPeer));
	/* clang-format off */
	_js_id = EM_ASM_INT({
		return Module.IDHandler.add($0);
	}, this);
	/* clang-format on */
};

EMWSClient::~EMWSClient() {
	disconnect_from_host();
	_peer = Ref<EMWSPeer>();
	/* clang-format off */
	EM_ASM({
		Module.IDHandler.remove($0);
	}, _js_id);
	/* clang-format on */
};

#endif // JAVASCRIPT_ENABLED