godot/modules/websocket/emws_client.cpp

/*************************************************************************/
/*  emws_client.cpp                                                      */
/*************************************************************************/
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/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
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#ifdef JAVASCRIPT_ENABLED

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

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

void EMWSClient::_esws_on_message(void *obj, const 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();
}

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

void EMWSClient::_esws_on_close(void *obj, int code, const char *reason, int was_clean) {
	EMWSClient *client = static_cast<EMWSClient *>(obj);
	client->_on_close_request(code, String(reason));
	client->_is_connecting = false;
	client->disconnect_from_host();
	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) {
	if (_js_id) {
		godot_js_websocket_destroy(_js_id);
		_js_id = 0;
	}

	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 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;

	_js_id = godot_js_websocket_create(this, str.utf8().get_data(), proto_string.utf8().get_data(), &_esws_on_connect, &_esws_on_message, &_esws_on_error, &_esws_on_close);
	if (!_js_id) {
		return FAILED;
	}

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

	return OK;
}

void EMWSClient::poll() {
}

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

MultiplayerPeer::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);
}

IPAddress EMWSClient::get_connected_host() const {
	ERR_FAIL_V_MSG(IPAddress(), "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);
	_out_buf_size = nearest_shift(p_out_buffer - 1) + 10;
	return OK;
}

EMWSClient::EMWSClient() {
	_peer = Ref<EMWSPeer>(memnew(EMWSPeer));
}

EMWSClient::~EMWSClient() {
	disconnect_from_host();
	_peer = Ref<EMWSPeer>();
	if (_js_id) {
		godot_js_websocket_destroy(_js_id);
	}
}

#endif // JAVASCRIPT_ENABLED