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godot/modules/multiplayer/scene_cache_interface.cpp

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/**************************************************************************/
/* scene_cache_interface.cpp */
/**************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/**************************************************************************/
#include "scene_cache_interface.h"
#include "scene_multiplayer.h"
#include "core/io/marshalls.h"
#include "scene/main/node.h"
#include "scene/main/window.h"
#include "scene/scene_string_names.h"
SceneCacheInterface::NodeCache &SceneCacheInterface::_track(Node *p_node) {
const ObjectID oid = p_node->get_instance_id();
NodeCache *nc = nodes_cache.getptr(oid);
if (!nc) {
nodes_cache[oid] = NodeCache();
p_node->connect(SceneStringName(tree_exited), callable_mp(this, &SceneCacheInterface::_remove_node_cache).bind(oid), Object::CONNECT_ONE_SHOT);
}
return nodes_cache[oid];
}
void SceneCacheInterface::_remove_node_cache(ObjectID p_oid) {
NodeCache *nc = nodes_cache.getptr(p_oid);
if (!nc) {
return;
}
if (nc->cache_id) {
assigned_ids.erase(nc->cache_id);
}
for (KeyValue<int, int> &E : nc->recv_ids) {
PeerInfo *pinfo = peers_info.getptr(E.key);
ERR_CONTINUE(!pinfo);
pinfo->recv_nodes.erase(E.value);
}
for (KeyValue<int, bool> &E : nc->confirmed_peers) {
PeerInfo *pinfo = peers_info.getptr(E.key);
ERR_CONTINUE(!pinfo);
pinfo->sent_nodes.erase(p_oid);
}
nodes_cache.erase(p_oid);
}
void SceneCacheInterface::on_peer_change(int p_id, bool p_connected) {
if (p_connected) {
peers_info.insert(p_id, PeerInfo());
} else {
PeerInfo *pinfo = peers_info.getptr(p_id);
ERR_FAIL_NULL(pinfo); // Bug.
for (KeyValue<int, ObjectID> E : pinfo->recv_nodes) {
NodeCache *nc = nodes_cache.getptr(E.value);
ERR_CONTINUE(!nc);
nc->recv_ids.erase(E.key);
}
for (const ObjectID &oid : pinfo->sent_nodes) {
NodeCache *nc = nodes_cache.getptr(oid);
ERR_CONTINUE(!nc);
nc->confirmed_peers.erase(p_id);
}
peers_info.erase(p_id);
}
}
void SceneCacheInterface::process_simplify_path(int p_from, const uint8_t *p_packet, int p_packet_len) {
ERR_FAIL_COND(!peers_info.has(p_from)); // Bug.
ERR_FAIL_COND_MSG(p_packet_len < 38, "Invalid packet received. Size too small.");
Node *root_node = SceneTree::get_singleton()->get_root()->get_node(multiplayer->get_root_path());
ERR_FAIL_NULL(root_node);
int ofs = 1;
String methods_md5;
methods_md5.parse_utf8((const char *)(p_packet + ofs), 32);
ofs += 33;
int id = decode_uint32(&p_packet[ofs]);
ofs += 4;
ERR_FAIL_COND_MSG(peers_info[p_from].recv_nodes.has(id), vformat("Duplicate remote cache ID %d for peer %d", id, p_from));
String paths;
paths.parse_utf8((const char *)(p_packet + ofs), p_packet_len - ofs);
const NodePath path = paths;
Node *node = root_node->get_node(path);
ERR_FAIL_NULL(node);
const bool valid_rpc_checksum = multiplayer->get_rpc_md5(node) == methods_md5;
if (valid_rpc_checksum == false) {
ERR_PRINT("The rpc node checksum failed. Make sure to have the same methods on both nodes. Node path: " + path);
}
peers_info[p_from].recv_nodes.insert(id, node->get_instance_id());
NodeCache &cache = _track(node);
cache.recv_ids.insert(p_from, id);
// Send ack.
Vector<uint8_t> packet;
packet.resize(1 + 1 + 4);
packet.write[0] = SceneMultiplayer::NETWORK_COMMAND_CONFIRM_PATH;
packet.write[1] = valid_rpc_checksum;
encode_uint32(id, &packet.write[2]);
Ref<MultiplayerPeer> multiplayer_peer = multiplayer->get_multiplayer_peer();
ERR_FAIL_COND(multiplayer_peer.is_null());
multiplayer_peer->set_transfer_channel(0);
multiplayer_peer->set_transfer_mode(MultiplayerPeer::TRANSFER_MODE_RELIABLE);
multiplayer->send_command(p_from, packet.ptr(), packet.size());
}
void SceneCacheInterface::process_confirm_path(int p_from, const uint8_t *p_packet, int p_packet_len) {
ERR_FAIL_COND_MSG(p_packet_len != 6, "Invalid packet received. Size too small.");
Node *root_node = SceneTree::get_singleton()->get_root()->get_node(multiplayer->get_root_path());
ERR_FAIL_NULL(root_node);
const bool valid_rpc_checksum = p_packet[1];
int id = decode_uint32(&p_packet[2]);
const ObjectID *oid = assigned_ids.getptr(id);
if (oid == nullptr) {
return; // May be trying to confirm a node that was removed.
}
if (valid_rpc_checksum == false) {
const Node *node = Object::cast_to<Node>(ObjectDB::get_instance(*oid));
ERR_FAIL_NULL(node); // Bug.
ERR_PRINT("The rpc node checksum failed. Make sure to have the same methods on both nodes. Node path: " + node->get_path());
}
NodeCache *cache = nodes_cache.getptr(*oid);
ERR_FAIL_NULL(cache); // Bug.
bool *confirmed = cache->confirmed_peers.getptr(p_from);
ERR_FAIL_NULL_MSG(confirmed, "Invalid packet received. Tries to confirm a node which was not requested.");
*confirmed = true;
}
Error SceneCacheInterface::_send_confirm_path(Node *p_node, NodeCache &p_cache, const List<int> &p_peers) {
// Encode function name.
const CharString path = String(multiplayer->get_root_path().rel_path_to(p_node->get_path())).utf8();
const int path_len = encode_cstring(path.get_data(), nullptr);
// Extract MD5 from rpc methods list.
const String methods_md5 = multiplayer->get_rpc_md5(p_node);
const int methods_md5_len = 33; // 32 + 1 for the `0` that is added by the encoder.
Vector<uint8_t> packet;
packet.resize(1 + 4 + path_len + methods_md5_len);
int ofs = 0;
packet.write[ofs] = SceneMultiplayer::NETWORK_COMMAND_SIMPLIFY_PATH;
ofs += 1;
ofs += encode_cstring(methods_md5.utf8().get_data(), &packet.write[ofs]);
ofs += encode_uint32(p_cache.cache_id, &packet.write[ofs]);
ofs += encode_cstring(path.get_data(), &packet.write[ofs]);
Ref<MultiplayerPeer> multiplayer_peer = multiplayer->get_multiplayer_peer();
ERR_FAIL_COND_V(multiplayer_peer.is_null(), ERR_BUG);
Error err = OK;
for (int peer_id : p_peers) {
multiplayer_peer->set_transfer_channel(0);
multiplayer_peer->set_transfer_mode(MultiplayerPeer::TRANSFER_MODE_RELIABLE);
err = multiplayer->send_command(peer_id, packet.ptr(), packet.size());
ERR_FAIL_COND_V(err != OK, err);
// Insert into confirmed, but as false since it was not confirmed.
p_cache.confirmed_peers.insert(peer_id, false);
ERR_CONTINUE(!peers_info.has(peer_id));
peers_info[peer_id].sent_nodes.insert(p_node->get_instance_id());
}
return err;
}
bool SceneCacheInterface::is_cache_confirmed(Node *p_node, int p_peer) {
ERR_FAIL_NULL_V(p_node, false);
const ObjectID oid = p_node->get_instance_id();
NodeCache *cache = nodes_cache.getptr(oid);
bool *confirmed = cache ? cache->confirmed_peers.getptr(p_peer) : nullptr;
return confirmed && *confirmed;
}
int SceneCacheInterface::make_object_cache(Object *p_obj) {
Node *node = Object::cast_to<Node>(p_obj);
ERR_FAIL_NULL_V(node, -1);
NodeCache &cache = _track(node);
if (cache.cache_id == 0) {
cache.cache_id = last_send_cache_id++;
assigned_ids[cache.cache_id] = p_obj->get_instance_id();
}
return cache.cache_id;
}
bool SceneCacheInterface::send_object_cache(Object *p_obj, int p_peer_id, int &r_id) {
Node *node = Object::cast_to<Node>(p_obj);
ERR_FAIL_NULL_V(node, false);
// See if the path is cached.
NodeCache &cache = _track(node);
if (cache.cache_id == 0) {
cache.cache_id = last_send_cache_id++;
assigned_ids[cache.cache_id] = p_obj->get_instance_id();
}
r_id = cache.cache_id;
bool has_all_peers = true;
List<int> peers_to_add; // If one is missing, take note to add it.
if (p_peer_id > 0) {
// Fast single peer check.
ERR_FAIL_COND_V_MSG(!peers_info.has(p_peer_id), false, "Peer doesn't exist: " + itos(p_peer_id));
bool *confirmed = cache.confirmed_peers.getptr(p_peer_id);
if (!confirmed) {
peers_to_add.push_back(p_peer_id); // Need to also be notified.
has_all_peers = false;
} else if (!(*confirmed)) {
has_all_peers = false;
}
} else {
// Long and painful.
for (KeyValue<int, PeerInfo> &E : peers_info) {
if (p_peer_id < 0 && E.key == -p_peer_id) {
continue; // Continue, excluded.
}
bool *confirmed = cache.confirmed_peers.getptr(E.key);
if (!confirmed) {
peers_to_add.push_back(E.key); // Need to also be notified.
has_all_peers = false;
} else if (!(*confirmed)) {
has_all_peers = false;
}
}
}
if (peers_to_add.size()) {
_send_confirm_path(node, cache, peers_to_add);
}
return has_all_peers;
}
Object *SceneCacheInterface::get_cached_object(int p_from, uint32_t p_cache_id) {
Node *root_node = SceneTree::get_singleton()->get_root()->get_node(multiplayer->get_root_path());
ERR_FAIL_NULL_V(root_node, nullptr);
PeerInfo *pinfo = peers_info.getptr(p_from);
ERR_FAIL_NULL_V(pinfo, nullptr);
const ObjectID *oid = pinfo->recv_nodes.getptr(p_cache_id);
ERR_FAIL_NULL_V_MSG(oid, nullptr, vformat("ID %d not found in cache of peer %d.", p_cache_id, p_from));
Node *node = Object::cast_to<Node>(ObjectDB::get_instance(*oid));
ERR_FAIL_NULL_V_MSG(node, nullptr, vformat("Failed to get cached node from peer %d with cache ID %d.", p_from, p_cache_id));
return node;
}
void SceneCacheInterface::clear() {
for (KeyValue<ObjectID, NodeCache> &E : nodes_cache) {
Object *obj = ObjectDB::get_instance(E.key);
ERR_CONTINUE(!obj);
obj->disconnect(SceneStringName(tree_exited), callable_mp(this, &SceneCacheInterface::_remove_node_cache));
}
peers_info.clear();
nodes_cache.clear();
assigned_ids.clear();
last_send_cache_id = 1;
}
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