godot/modules/websocket/lws_server.cpp

/*************************************************************************/
/*  lws_server.cpp                                                       */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md)    */
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#ifndef JAVASCRIPT_ENABLED

#include "lws_server.h"
#include "core/os/os.h"

Error LWSServer::listen(int p_port, PoolVector<String> p_protocols, bool gd_mp_api) {

	ERR_FAIL_COND_V(context != NULL, FAILED);

	_is_multiplayer = gd_mp_api;

	struct lws_context_creation_info info;
	memset(&info, 0, sizeof info);

	if (p_protocols.size() == 0) // default to binary protocol
		p_protocols.append(String("binary"));

	// Prepare lws protocol structs
	_lws_make_protocols(this, &LWSServer::_lws_gd_callback, p_protocols, &_lws_ref);

	info.port = p_port;
	info.user = _lws_ref;
	info.protocols = _lws_ref->lws_structs;
	info.gid = -1;
	info.uid = -1;
	//info.ws_ping_pong_interval = 5;

	context = lws_create_context(&info);

	if (context == NULL) {
		_lws_free_ref(_lws_ref);
		_lws_ref = NULL;
		ERR_EXPLAIN("Unable to create LWS context");
		ERR_FAIL_V(FAILED);
	}

	return OK;
}

bool LWSServer::is_listening() const {
	return context != NULL;
}

int LWSServer::_handle_cb(struct lws *wsi, enum lws_callback_reasons reason, void *user, void *in, size_t len) {

	LWSPeer::PeerData *peer_data = (LWSPeer::PeerData *)user;

	switch (reason) {
		case LWS_CALLBACK_HTTP:
			// no http for now
			// closing immediately returning -1;
			return -1;

		case LWS_CALLBACK_FILTER_PROTOCOL_CONNECTION:
			// check header here?
			break;

		case LWS_CALLBACK_ESTABLISHED: {
			int32_t id = _gen_unique_id();

			Ref<LWSPeer> peer = Ref<LWSPeer>(memnew(LWSPeer));
			peer->set_wsi(wsi);
			_peer_map[id] = peer;

			peer_data->peer_id = id;
			peer_data->in_size = 0;
			peer_data->in_count = 0;
			peer_data->out_count = 0;
			peer_data->rbw.resize(16);
			peer_data->rbr.resize(16);
			peer_data->force_close = false;

			_on_connect(id, lws_get_protocol(wsi)->name);
			break;
		}

		case LWS_CALLBACK_CLOSED: {
			if (peer_data == NULL)
				return 0;
			int32_t id = peer_data->peer_id;
			if (_peer_map.has(id)) {
				_peer_map[id]->close();
				_peer_map.erase(id);
			}
			peer_data->in_count = 0;
			peer_data->out_count = 0;
			peer_data->rbr.resize(0);
			peer_data->rbw.resize(0);
			_on_disconnect(id);
			return 0; // we can end here
		}

		case LWS_CALLBACK_RECEIVE: {
			int32_t id = peer_data->peer_id;
			if (_peer_map.has(id)) {
				static_cast<Ref<LWSPeer> >(_peer_map[id])->read_wsi(in, len);
				if (_peer_map[id]->get_available_packet_count() > 0)
					_on_peer_packet(id);
			}
			break;
		}

		case LWS_CALLBACK_SERVER_WRITEABLE: {
			if (peer_data->force_close)
				return -1;

			int id = peer_data->peer_id;
			if (_peer_map.has(id))
				static_cast<Ref<LWSPeer> >(_peer_map[id])->write_wsi();
			break;
		}

		default:
			break;
	}

	return 0;
}

void LWSServer::stop() {
	if (context == NULL)
		return;

	_peer_map.clear();
	destroy_context();
	context = NULL;
}

bool LWSServer::has_peer(int p_id) const {
	return _peer_map.has(p_id);
}

Ref<WebSocketPeer> LWSServer::get_peer(int p_id) const {
	ERR_FAIL_COND_V(!has_peer(p_id), NULL);
	return _peer_map[p_id];
}

LWSServer::LWSServer() {
	context = NULL;
	_lws_ref = NULL;
}

LWSServer::~LWSServer() {
	invalidate_lws_ref(); // we do not want any more callbacks
	stop();
}

#endif // JAVASCRIPT_ENABLED