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d95794ec8a
As many open source projects have started doing it, we're removing the current year from the copyright notice, so that we don't need to bump it every year. It seems like only the first year of publication is technically relevant for copyright notices, and even that seems to be something that many companies stopped listing altogether (in a version controlled codebase, the commits are a much better source of date of publication than a hardcoded copyright statement). We also now list Godot Engine contributors first as we're collectively the current maintainers of the project, and we clarify that the "exclusive" copyright of the co-founders covers the timespan before opensourcing (their further contributions are included as part of Godot Engine contributors). Also fixed "cf." Frenchism - it's meant as "refer to / see".
503 lines
17 KiB
C++
503 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) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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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);
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return hosts[0];
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}
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Ref<ENetPacketPeer> ENetMultiplayerPeer::get_peer(int p_id) const {
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ERR_FAIL_COND_V(!_is_active(), nullptr);
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ERR_FAIL_COND_V(!peers.has(p_id), nullptr);
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ERR_FAIL_COND_V(active_mode == MODE_CLIENT && p_id != 1, nullptr);
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return peers[p_id];
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}
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void ENetMultiplayerPeer::_destroy_unused(ENetPacket *p_packet) {
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if (p_packet->referenceCount == 0) {
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enet_packet_destroy(p_packet);
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}
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}
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void ENetMultiplayerPeer::_bind_methods() {
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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));
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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));
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ClassDB::bind_method(D_METHOD("create_mesh", "unique_id"), &ENetMultiplayerPeer::create_mesh);
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ClassDB::bind_method(D_METHOD("add_mesh_peer", "peer_id", "host"), &ENetMultiplayerPeer::add_mesh_peer);
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ClassDB::bind_method(D_METHOD("set_bind_ip", "ip"), &ENetMultiplayerPeer::set_bind_ip);
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ClassDB::bind_method(D_METHOD("get_host"), &ENetMultiplayerPeer::get_host);
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ClassDB::bind_method(D_METHOD("get_peer", "id"), &ENetMultiplayerPeer::get_peer);
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ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "host", PROPERTY_HINT_RESOURCE_TYPE, "ENetConnection", PROPERTY_USAGE_NONE), "", "get_host");
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}
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ENetMultiplayerPeer::ENetMultiplayerPeer() {
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bind_ip = IPAddress("*");
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}
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ENetMultiplayerPeer::~ENetMultiplayerPeer() {
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if (_is_active()) {
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close();
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}
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}
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// Sets IP for ENet to bind when using create_server or create_client
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// if no IP is set, then ENet bind to ENET_HOST_ANY
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void ENetMultiplayerPeer::set_bind_ip(const IPAddress &p_ip) {
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ERR_FAIL_COND_MSG(!p_ip.is_valid() && !p_ip.is_wildcard(), vformat("Invalid bind IP address: %s", String(p_ip)));
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bind_ip = p_ip;
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}
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