/**************************************************************************/ /* 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" void SceneCacheInterface::on_peer_change(int p_id, bool p_connected) { if (p_connected) { path_get_cache.insert(p_id, PathGetCache()); } else { // Cleanup get cache. path_get_cache.erase(p_id); // Cleanup sent cache. // Some refactoring is needed to make this faster and do paths GC. for (const KeyValue<NodePath, PathSentCache> &E : path_send_cache) { PathSentCache *psc = path_send_cache.getptr(E.key); psc->confirmed_peers.erase(p_id); } } } void SceneCacheInterface::process_simplify_path(int p_from, const uint8_t *p_packet, int p_packet_len) { Node *root_node = SceneTree::get_singleton()->get_root()->get_node(multiplayer->get_root_path()); ERR_FAIL_COND(!root_node); ERR_FAIL_COND_MSG(p_packet_len < 38, "Invalid packet received. Size too small."); 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; String paths; paths.parse_utf8((const char *)(p_packet + ofs), p_packet_len - ofs); NodePath path = paths; if (!path_get_cache.has(p_from)) { path_get_cache[p_from] = PathGetCache(); } Node *node = root_node->get_node(path); ERR_FAIL_COND(node == nullptr); 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); } PathGetCache::NodeInfo ni; ni.path = path; path_get_cache[p_from].nodes[id] = ni; // Encode path to send ack. CharString pname = String(path).utf8(); int len = encode_cstring(pname.get_data(), nullptr); Vector<uint8_t> packet; packet.resize(1 + 1 + len); packet.write[0] = SceneMultiplayer::NETWORK_COMMAND_CONFIRM_PATH; packet.write[1] = valid_rpc_checksum; encode_cstring(pname.get_data(), &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 < 3, "Invalid packet received. Size too small."); const bool valid_rpc_checksum = p_packet[1]; String paths; paths.parse_utf8((const char *)&p_packet[2], p_packet_len - 2); NodePath path = paths; 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); } PathSentCache *psc = path_send_cache.getptr(path); ERR_FAIL_COND_MSG(!psc, "Invalid packet received. Tries to confirm a path which was not found in cache."); HashMap<int, bool>::Iterator E = psc->confirmed_peers.find(p_from); ERR_FAIL_COND_MSG(!E, "Invalid packet received. Source peer was not found in cache for the given path."); E->value = true; } Error SceneCacheInterface::_send_confirm_path(Node *p_node, NodePath p_path, PathSentCache *psc, const List<int> &p_peers) { // Encode function name. const CharString path = String(p_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(psc->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. psc->confirmed_peers.insert(peer_id, false); } return err; } bool SceneCacheInterface::is_cache_confirmed(NodePath p_path, int p_peer) { const PathSentCache *psc = path_send_cache.getptr(p_path); ERR_FAIL_COND_V(!psc, false); HashMap<int, bool>::ConstIterator F = psc->confirmed_peers.find(p_peer); ERR_FAIL_COND_V(!F, false); // Should never happen. return F->value; } int SceneCacheInterface::make_object_cache(Object *p_obj) { Node *node = Object::cast_to<Node>(p_obj); ERR_FAIL_COND_V(!node, -1); NodePath for_path = multiplayer->get_root_path().rel_path_to(node->get_path()); // See if the path is cached. PathSentCache *psc = path_send_cache.getptr(for_path); if (!psc) { // Path is not cached, create. path_send_cache[for_path] = PathSentCache(); psc = path_send_cache.getptr(for_path); psc->id = last_send_cache_id++; } return psc->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_COND_V(!node, false); r_id = make_object_cache(p_obj); ERR_FAIL_COND_V(r_id < 0, false); NodePath for_path = multiplayer->get_root_path().rel_path_to(node->get_path()); PathSentCache *psc = path_send_cache.getptr(for_path); 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. HashMap<int, bool>::Iterator F = psc->confirmed_peers.find(p_peer_id); if (!F) { peers_to_add.push_back(p_peer_id); // Need to also be notified. has_all_peers = false; } else if (!F->value) { has_all_peers = false; } } else { // Long and painful. for (const int &E : multiplayer->get_connected_peers()) { if (p_peer_id < 0 && E == -p_peer_id) { continue; // Continue, excluded. } HashMap<int, bool>::Iterator F = psc->confirmed_peers.find(E); if (!F) { peers_to_add.push_back(E); // Need to also be notified. has_all_peers = false; } else if (!F->value) { has_all_peers = false; } } } if (peers_to_add.size()) { _send_confirm_path(node, for_path, psc, 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_COND_V(!root_node, nullptr); HashMap<int, PathGetCache>::Iterator E = path_get_cache.find(p_from); ERR_FAIL_COND_V_MSG(!E, nullptr, vformat("No cache found for peer %d.", p_from)); HashMap<int, PathGetCache::NodeInfo>::Iterator F = E->value.nodes.find(p_cache_id); ERR_FAIL_COND_V_MSG(!F, nullptr, vformat("ID %d not found in cache of peer %d.", p_cache_id, p_from)); PathGetCache::NodeInfo *ni = &F->value; Node *node = root_node->get_node(ni->path); if (!node) { ERR_PRINT("Failed to get cached path: " + String(ni->path) + "."); } return node; } void SceneCacheInterface::clear() { path_get_cache.clear(); path_send_cache.clear(); last_send_cache_id = 1; }