502 lines
17 KiB
C++
502 lines
17 KiB
C++
/*************************************************************************/
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/* enet_multiplayer_peer.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#include "enet_multiplayer_peer.h"
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#include "core/io/ip.h"
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#include "core/io/marshalls.h"
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#include "core/os/os.h"
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void ENetMultiplayerPeer::set_target_peer(int p_peer) {
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target_peer = p_peer;
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}
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int ENetMultiplayerPeer::get_packet_peer() const {
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ERR_FAIL_COND_V_MSG(!_is_active(), 1, "The multiplayer instance isn't currently active.");
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ERR_FAIL_COND_V(incoming_packets.size() == 0, 1);
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return incoming_packets.front()->get().from;
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}
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MultiplayerPeer::TransferMode ENetMultiplayerPeer::get_packet_mode() const {
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ERR_FAIL_COND_V_MSG(!_is_active(), TRANSFER_MODE_RELIABLE, "The multiplayer instance isn't currently active.");
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ERR_FAIL_COND_V(incoming_packets.size() == 0, TRANSFER_MODE_RELIABLE);
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return incoming_packets.front()->get().transfer_mode;
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}
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int ENetMultiplayerPeer::get_packet_channel() const {
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ERR_FAIL_COND_V_MSG(!_is_active(), 1, "The multiplayer instance isn't currently active.");
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ERR_FAIL_COND_V(incoming_packets.size() == 0, 1);
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int ch = incoming_packets.front()->get().channel;
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if (ch >= SYSCH_MAX) { // First 2 channels are reserved.
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return ch - SYSCH_MAX + 1;
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}
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return 0;
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}
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Error ENetMultiplayerPeer::create_server(int p_port, int p_max_clients, int p_max_channels, int p_in_bandwidth, int p_out_bandwidth) {
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ERR_FAIL_COND_V_MSG(_is_active(), ERR_ALREADY_IN_USE, "The multiplayer instance is already active.");
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set_refuse_new_connections(false);
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Ref<ENetConnection> host;
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host.instantiate();
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Error err = host->create_host_bound(bind_ip, p_port, p_max_clients, 0, p_max_channels > 0 ? p_max_channels + SYSCH_MAX : 0, p_out_bandwidth);
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if (err != OK) {
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return err;
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}
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active_mode = MODE_SERVER;
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unique_id = 1;
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connection_status = CONNECTION_CONNECTED;
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hosts[0] = host;
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return OK;
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}
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Error ENetMultiplayerPeer::create_client(const String &p_address, int p_port, int p_channel_count, int p_in_bandwidth, int p_out_bandwidth, int p_local_port) {
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ERR_FAIL_COND_V_MSG(_is_active(), ERR_ALREADY_IN_USE, "The multiplayer instance is already active.");
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set_refuse_new_connections(false);
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Ref<ENetConnection> host;
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host.instantiate();
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Error err;
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if (p_local_port) {
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err = host->create_host_bound(bind_ip, p_local_port, 1, 0, p_in_bandwidth, p_out_bandwidth);
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} else {
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err = host->create_host(1, 0, p_in_bandwidth, p_out_bandwidth);
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}
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if (err != OK) {
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return err;
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}
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unique_id = generate_unique_id();
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Ref<ENetPacketPeer> peer = host->connect_to_host(p_address, p_port, p_channel_count > 0 ? p_channel_count + SYSCH_MAX : 0, unique_id);
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if (peer.is_null()) {
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host->destroy();
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ERR_FAIL_V_MSG(ERR_CANT_CREATE, "Couldn't connect to the ENet multiplayer server.");
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}
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// Need to wait for CONNECT event.
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connection_status = CONNECTION_CONNECTING;
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active_mode = MODE_CLIENT;
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peers[1] = peer;
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hosts[0] = host;
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return OK;
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}
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Error ENetMultiplayerPeer::create_mesh(int p_id) {
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ERR_FAIL_COND_V_MSG(p_id <= 0, ERR_INVALID_PARAMETER, "The unique ID must be greater then 0");
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ERR_FAIL_COND_V_MSG(_is_active(), ERR_ALREADY_IN_USE, "The multiplayer instance is already active.");
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active_mode = MODE_MESH;
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unique_id = p_id;
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connection_status = CONNECTION_CONNECTED;
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return OK;
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}
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Error ENetMultiplayerPeer::add_mesh_peer(int p_id, Ref<ENetConnection> p_host) {
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ERR_FAIL_COND_V(p_host.is_null(), ERR_INVALID_PARAMETER);
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ERR_FAIL_COND_V_MSG(active_mode != MODE_MESH, ERR_UNCONFIGURED, "The multiplayer instance is not configured as a mesh. Call 'create_mesh' first.");
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List<Ref<ENetPacketPeer>> host_peers;
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p_host->get_peers(host_peers);
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ERR_FAIL_COND_V_MSG(host_peers.size() != 1 || host_peers[0]->get_state() != ENetPacketPeer::STATE_CONNECTED, ERR_INVALID_PARAMETER, "The provided host must have exactly one peer in the connected state.");
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hosts[p_id] = p_host;
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peers[p_id] = host_peers[0];
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emit_signal(SNAME("peer_connected"), p_id);
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return OK;
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}
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void ENetMultiplayerPeer::_store_packet(int32_t p_source, ENetConnection::Event &p_event) {
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Packet packet;
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packet.packet = p_event.packet;
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packet.channel = p_event.channel_id;
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packet.from = p_source;
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if (p_event.packet->flags & ENET_PACKET_FLAG_RELIABLE) {
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packet.transfer_mode = TRANSFER_MODE_RELIABLE;
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} else if (p_event.packet->flags & ENET_PACKET_FLAG_UNSEQUENCED) {
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packet.transfer_mode = TRANSFER_MODE_UNRELIABLE;
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} else {
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packet.transfer_mode = TRANSFER_MODE_UNRELIABLE_ORDERED;
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}
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packet.packet->referenceCount++;
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incoming_packets.push_back(packet);
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}
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void ENetMultiplayerPeer::_disconnect_inactive_peers() {
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HashSet<int> to_drop;
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for (const KeyValue<int, Ref<ENetPacketPeer>> &E : peers) {
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if (E.value->is_active()) {
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continue;
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}
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to_drop.insert(E.key);
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}
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for (const int &P : to_drop) {
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peers.erase(P);
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if (hosts.has(P)) {
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hosts.erase(P);
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}
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ERR_CONTINUE(active_mode == MODE_CLIENT && P != TARGET_PEER_SERVER);
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emit_signal(SNAME("peer_disconnected"), P);
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}
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}
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void ENetMultiplayerPeer::poll() {
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ERR_FAIL_COND_MSG(!_is_active(), "The multiplayer instance isn't currently active.");
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_pop_current_packet();
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_disconnect_inactive_peers();
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switch (active_mode) {
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case MODE_CLIENT: {
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if (!peers.has(1)) {
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close();
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return;
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}
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ENetConnection::Event event;
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ENetConnection::EventType ret = hosts[0]->service(0, event);
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do {
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if (ret == ENetConnection::EVENT_CONNECT) {
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connection_status = CONNECTION_CONNECTED;
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emit_signal(SNAME("peer_connected"), 1);
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} else if (ret == ENetConnection::EVENT_DISCONNECT) {
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if (connection_status == CONNECTION_CONNECTED) {
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// Client just disconnected from server.
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emit_signal(SNAME("peer_disconnected"), 1);
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}
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close();
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} else if (ret == ENetConnection::EVENT_RECEIVE) {
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_store_packet(1, event);
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} else if (ret != ENetConnection::EVENT_NONE) {
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close(); // Error.
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}
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} while (hosts.has(0) && hosts[0]->check_events(ret, event) > 0);
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} break;
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case MODE_SERVER: {
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ENetConnection::Event event;
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ENetConnection::EventType ret = hosts[0]->service(0, event);
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do {
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if (ret == ENetConnection::EVENT_CONNECT) {
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if (is_refusing_new_connections()) {
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event.peer->reset();
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continue;
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}
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// Client joined with invalid ID, probably trying to exploit us.
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if (event.data < 2 || peers.has((int)event.data)) {
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event.peer->reset();
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continue;
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}
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int id = event.data;
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event.peer->set_meta(SNAME("_net_id"), id);
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peers[id] = event.peer;
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emit_signal(SNAME("peer_connected"), id);
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} else if (ret == ENetConnection::EVENT_DISCONNECT) {
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int id = event.peer->get_meta(SNAME("_net_id"));
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if (!peers.has(id)) {
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// Never fully connected.
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continue;
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}
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emit_signal(SNAME("peer_disconnected"), id);
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peers.erase(id);
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} else if (ret == ENetConnection::EVENT_RECEIVE) {
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int32_t source = event.peer->get_meta(SNAME("_net_id"));
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_store_packet(source, event);
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} else if (ret != ENetConnection::EVENT_NONE) {
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close(); // Error
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}
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} while (hosts.has(0) && hosts[0]->check_events(ret, event) > 0);
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} break;
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case MODE_MESH: {
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HashSet<int> to_drop;
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for (KeyValue<int, Ref<ENetConnection>> &E : hosts) {
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ENetConnection::Event event;
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ENetConnection::EventType ret = E.value->service(0, event);
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do {
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if (ret == ENetConnection::EVENT_CONNECT) {
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event.peer->reset();
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} else if (ret == ENetConnection::EVENT_RECEIVE) {
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_store_packet(E.key, event);
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} else if (ret == ENetConnection::EVENT_NONE) {
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break; // Keep polling the others.
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} else {
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to_drop.insert(E.key); // Error or disconnect.
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break; // Keep polling the others.
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}
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} while (E.value->check_events(ret, event) > 0);
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}
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for (const int &P : to_drop) {
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if (peers.has(P)) {
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emit_signal(SNAME("peer_disconnected"), P);
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peers.erase(P);
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}
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hosts.erase(P);
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}
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} break;
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default:
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return;
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}
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}
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bool ENetMultiplayerPeer::is_server() const {
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return active_mode == MODE_SERVER;
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}
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bool ENetMultiplayerPeer::is_server_relay_supported() const {
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return active_mode == MODE_SERVER || active_mode == MODE_CLIENT;
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}
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void ENetMultiplayerPeer::disconnect_peer(int p_peer, bool p_force) {
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ERR_FAIL_COND(!_is_active() || !peers.has(p_peer));
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peers[p_peer]->peer_disconnect(0); // Will be removed during next poll.
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if (active_mode == MODE_CLIENT || active_mode == MODE_SERVER) {
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hosts[0]->flush();
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} else {
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ERR_FAIL_COND(!hosts.has(p_peer));
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hosts[p_peer]->flush();
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}
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if (p_force) {
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peers.erase(p_peer);
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if (hosts.has(p_peer)) {
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hosts.erase(p_peer);
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}
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if (active_mode == MODE_CLIENT) {
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hosts.clear(); // Avoid flushing again.
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close();
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}
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}
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}
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void ENetMultiplayerPeer::close() {
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if (!_is_active()) {
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return;
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}
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_pop_current_packet();
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for (KeyValue<int, Ref<ENetPacketPeer>> &E : peers) {
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if (E.value.is_valid() && E.value->get_state() == ENetPacketPeer::STATE_CONNECTED) {
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E.value->peer_disconnect_now(0);
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}
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}
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for (KeyValue<int, Ref<ENetConnection>> &E : hosts) {
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E.value->flush();
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}
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active_mode = MODE_NONE;
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incoming_packets.clear();
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peers.clear();
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hosts.clear();
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unique_id = 0;
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connection_status = CONNECTION_DISCONNECTED;
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set_refuse_new_connections(false);
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}
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int ENetMultiplayerPeer::get_available_packet_count() const {
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return incoming_packets.size();
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}
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Error ENetMultiplayerPeer::get_packet(const uint8_t **r_buffer, int &r_buffer_size) {
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ERR_FAIL_COND_V_MSG(incoming_packets.size() == 0, ERR_UNAVAILABLE, "No incoming packets available.");
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_pop_current_packet();
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current_packet = incoming_packets.front()->get();
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incoming_packets.pop_front();
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*r_buffer = (const uint8_t *)(current_packet.packet->data);
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r_buffer_size = current_packet.packet->dataLength;
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return OK;
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}
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Error ENetMultiplayerPeer::put_packet(const uint8_t *p_buffer, int p_buffer_size) {
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ERR_FAIL_COND_V_MSG(!_is_active(), ERR_UNCONFIGURED, "The multiplayer instance isn't currently active.");
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ERR_FAIL_COND_V_MSG(connection_status != CONNECTION_CONNECTED, ERR_UNCONFIGURED, "The multiplayer instance isn't currently connected to any server or client.");
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ERR_FAIL_COND_V_MSG(target_peer != 0 && !peers.has(ABS(target_peer)), ERR_INVALID_PARAMETER, vformat("Invalid target peer: %d", target_peer));
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ERR_FAIL_COND_V(active_mode == MODE_CLIENT && !peers.has(1), ERR_BUG);
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int packet_flags = 0;
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int channel = SYSCH_RELIABLE;
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int tr_channel = get_transfer_channel();
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if (tr_channel > 0) {
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channel = SYSCH_MAX + tr_channel - 1;
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} else {
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switch (get_transfer_mode()) {
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case TRANSFER_MODE_UNRELIABLE: {
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packet_flags = ENET_PACKET_FLAG_UNSEQUENCED | ENET_PACKET_FLAG_UNRELIABLE_FRAGMENT;
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channel = SYSCH_UNRELIABLE;
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} break;
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case TRANSFER_MODE_UNRELIABLE_ORDERED: {
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packet_flags = ENET_PACKET_FLAG_UNRELIABLE_FRAGMENT;
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channel = SYSCH_UNRELIABLE;
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} break;
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case TRANSFER_MODE_RELIABLE: {
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packet_flags = ENET_PACKET_FLAG_RELIABLE;
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channel = SYSCH_RELIABLE;
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} break;
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}
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}
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#ifdef DEBUG_ENABLED
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if ((packet_flags & ENET_PACKET_FLAG_UNRELIABLE_FRAGMENT) && p_buffer_size > ENET_HOST_DEFAULT_MTU) {
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WARN_PRINT_ONCE(vformat("Sending %d bytes unrealiably which is above the MTU (%d), this will result in higher packet loss", p_buffer_size, ENET_HOST_DEFAULT_MTU));
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}
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#endif
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ENetPacket *packet = enet_packet_create(nullptr, p_buffer_size, packet_flags);
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memcpy(&packet->data[0], p_buffer, p_buffer_size);
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if (is_server()) {
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if (target_peer == 0) {
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hosts[0]->broadcast(channel, packet);
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} else if (target_peer < 0) {
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// Send to all but one and make copies for sending.
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int exclude = -target_peer;
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for (KeyValue<int, Ref<ENetPacketPeer>> &E : peers) {
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if (E.key == exclude) {
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continue;
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}
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E.value->send(channel, packet);
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}
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_destroy_unused(packet);
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} else {
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peers[target_peer]->send(channel, packet);
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}
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ERR_FAIL_COND_V(!hosts.has(0), ERR_BUG);
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hosts[0]->flush();
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} else if (active_mode == MODE_CLIENT) {
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peers[1]->send(channel, packet); // Send to server for broadcast.
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ERR_FAIL_COND_V(!hosts.has(0), ERR_BUG);
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hosts[0]->flush();
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} else {
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if (target_peer <= 0) {
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int exclude = ABS(target_peer);
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for (KeyValue<int, Ref<ENetPacketPeer>> &E : peers) {
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if (E.key == exclude) {
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continue;
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}
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E.value->send(channel, packet);
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ERR_CONTINUE(!hosts.has(E.key));
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hosts[E.key]->flush();
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}
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_destroy_unused(packet);
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} else {
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peers[target_peer]->send(channel, packet);
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ERR_FAIL_COND_V(!hosts.has(target_peer), ERR_BUG);
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hosts[target_peer]->flush();
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}
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}
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return OK;
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}
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int ENetMultiplayerPeer::get_max_packet_size() const {
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return 1 << 24; // Anything is good
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}
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void ENetMultiplayerPeer::_pop_current_packet() {
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if (current_packet.packet) {
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current_packet.packet->referenceCount--;
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_destroy_unused(current_packet.packet);
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current_packet.packet = nullptr;
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current_packet.from = 0;
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current_packet.channel = -1;
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}
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}
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MultiplayerPeer::ConnectionStatus ENetMultiplayerPeer::get_connection_status() const {
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return connection_status;
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}
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int ENetMultiplayerPeer::get_unique_id() const {
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ERR_FAIL_COND_V_MSG(!_is_active(), 0, "The multiplayer instance isn't currently active.");
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return unique_id;
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}
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void ENetMultiplayerPeer::set_refuse_new_connections(bool p_enabled) {
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#ifdef GODOT_ENET
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if (_is_active()) {
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for (KeyValue<int, Ref<ENetConnection>> &E : hosts) {
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E.value->refuse_new_connections(p_enabled);
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}
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}
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#endif
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MultiplayerPeer::set_refuse_new_connections(p_enabled);
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}
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Ref<ENetConnection> ENetMultiplayerPeer::get_host() const {
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ERR_FAIL_COND_V(!_is_active(), nullptr);
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ERR_FAIL_COND_V(active_mode == MODE_MESH, nullptr);
|
|
return hosts[0];
|
|
}
|
|
|
|
Ref<ENetPacketPeer> ENetMultiplayerPeer::get_peer(int p_id) const {
|
|
ERR_FAIL_COND_V(!_is_active(), nullptr);
|
|
ERR_FAIL_COND_V(!peers.has(p_id), nullptr);
|
|
ERR_FAIL_COND_V(active_mode == MODE_CLIENT && p_id != 1, nullptr);
|
|
return peers[p_id];
|
|
}
|
|
|
|
void ENetMultiplayerPeer::_destroy_unused(ENetPacket *p_packet) {
|
|
if (p_packet->referenceCount == 0) {
|
|
enet_packet_destroy(p_packet);
|
|
}
|
|
}
|
|
|
|
void ENetMultiplayerPeer::_bind_methods() {
|
|
ClassDB::bind_method(D_METHOD("create_server", "port", "max_clients", "max_channels", "in_bandwidth", "out_bandwidth"), &ENetMultiplayerPeer::create_server, DEFVAL(32), DEFVAL(0), DEFVAL(0), DEFVAL(0));
|
|
ClassDB::bind_method(D_METHOD("create_client", "address", "port", "channel_count", "in_bandwidth", "out_bandwidth", "local_port"), &ENetMultiplayerPeer::create_client, DEFVAL(0), DEFVAL(0), DEFVAL(0), DEFVAL(0));
|
|
ClassDB::bind_method(D_METHOD("create_mesh", "unique_id"), &ENetMultiplayerPeer::create_mesh);
|
|
ClassDB::bind_method(D_METHOD("add_mesh_peer", "peer_id", "host"), &ENetMultiplayerPeer::add_mesh_peer);
|
|
ClassDB::bind_method(D_METHOD("set_bind_ip", "ip"), &ENetMultiplayerPeer::set_bind_ip);
|
|
|
|
ClassDB::bind_method(D_METHOD("get_host"), &ENetMultiplayerPeer::get_host);
|
|
ClassDB::bind_method(D_METHOD("get_peer", "id"), &ENetMultiplayerPeer::get_peer);
|
|
|
|
ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "host", PROPERTY_HINT_RESOURCE_TYPE, "ENetConnection", PROPERTY_USAGE_NONE), "", "get_host");
|
|
}
|
|
|
|
ENetMultiplayerPeer::ENetMultiplayerPeer() {
|
|
bind_ip = IPAddress("*");
|
|
}
|
|
|
|
ENetMultiplayerPeer::~ENetMultiplayerPeer() {
|
|
if (_is_active()) {
|
|
close();
|
|
}
|
|
}
|
|
|
|
// Sets IP for ENet to bind when using create_server or create_client
|
|
// if no IP is set, then ENet bind to ENET_HOST_ANY
|
|
void ENetMultiplayerPeer::set_bind_ip(const IPAddress &p_ip) {
|
|
ERR_FAIL_COND_MSG(!p_ip.is_valid() && !p_ip.is_wildcard(), vformat("Invalid bind IP address: %s", String(p_ip)));
|
|
|
|
bind_ip = p_ip;
|
|
}
|