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[MP] Handle cleanup of "scene cache" nodes 

Make sure we delete the relevant ObjectID from the cache when the nodes
are removed from tree.
This commit is contained in:
Fabio Alessandrelli 2023-12-10 14:40:18 +01:00
parent 2ababdcc06
commit 853df2895a
2 changed files with 109 additions and 82 deletions
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164
modules/multiplayer/scene_cache_interface.cpp
View File

@ -35,25 +35,61 @@
#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(SceneStringNames::get_singleton()->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;
}
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) {
path_get_cache.insert(p_id, PathGetCache());
peers_info.insert(p_id, PeerInfo());
} 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 (KeyValue<ObjectID, PathSentCache> &E : path_send_cache) {
E.value.confirmed_peers.erase(p_id);
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);
ERR_FAIL_COND_MSG(p_packet_len < 38, "Invalid packet received. Size too small.");
int ofs = 1;
String methods_md5;
@ -63,15 +99,13 @@ void SceneCacheInterface::process_simplify_path(int p_from, const uint8_t *p_pac
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;
if (!path_get_cache.has(p_from)) {
path_get_cache[p_from] = PathGetCache();
}
Node *node = root_node->get_node(path);
ERR_FAIL_NULL(node);
const bool valid_rpc_checksum = multiplayer->get_rpc_md5(node) == methods_md5;
@ -79,10 +113,9 @@ void SceneCacheInterface::process_simplify_path(int p_from, const uint8_t *p_pac
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 = node->get_path();
path_get_cache[p_from].nodes[id] = ni;
peers_info[p_from].recv_nodes.insert(id, node->get_instance_id());
NodeCache &cache = _track(node);
cache.recv_ids.insert(p_from, id);
// Encode path to send ack.
CharString pname = String(path).utf8();
@ -122,15 +155,15 @@ void SceneCacheInterface::process_confirm_path(int p_from, const uint8_t *p_pack
Node *node = root_node->get_node(path);
ERR_FAIL_NULL(node);
PathSentCache *psc = path_send_cache.getptr(node->get_instance_id());
ERR_FAIL_NULL_MSG(psc, "Invalid packet received. Tries to confirm a path which was not found in cache.");
NodeCache *cache = nodes_cache.getptr(node->get_instance_id());
ERR_FAIL_NULL_MSG(cache, "Invalid packet received. Tries to confirm a node which was not requested.");
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;
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, PathSentCache *psc, const List<int> &p_peers) {
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);
@ -148,7 +181,7 @@ Error SceneCacheInterface::_send_confirm_path(Node *p_node, PathSentCache *psc,
ofs += encode_cstring(methods_md5.utf8().get_data(), &packet.write[ofs]);
ofs += encode_uint32(psc->id, &packet.write[ofs]);
ofs += encode_uint32(p_cache.cache_id, &packet.write[ofs]);
ofs += encode_cstring(path.get_data(), &packet.write[ofs]);
@ -162,80 +195,74 @@ Error SceneCacheInterface::_send_confirm_path(Node *p_node, PathSentCache *psc,
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);
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 PathSentCache *psc = path_send_cache.getptr(p_node->get_instance_id());
ERR_FAIL_NULL_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;
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);
const ObjectID oid = node->get_instance_id();
// See if the path is cached.
PathSentCache *psc = path_send_cache.getptr(oid);
if (!psc) {
// Path is not cached, create.
path_send_cache[oid] = PathSentCache();
psc = path_send_cache.getptr(oid);
psc->id = last_send_cache_id++;
NodeCache &cache = _track(node);
if (cache.cache_id == 0) {
cache.cache_id = last_send_cache_id++;
}
return psc->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);
const ObjectID oid = node->get_instance_id();
// See if the path is cached.
PathSentCache *psc = path_send_cache.getptr(oid);
if (!psc) {
// Path is not cached, create.
path_send_cache[oid] = PathSentCache();
psc = path_send_cache.getptr(oid);
psc->id = last_send_cache_id++;
NodeCache &cache = _track(node);
if (cache.cache_id == 0) {
cache.cache_id = last_send_cache_id++;
}
r_id = psc->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.
HashMap<int, bool>::Iterator F = psc->confirmed_peers.find(p_peer_id);
if (!F) {
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 (!F->value) {
} else if (!(*confirmed)) {
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) {
for (KeyValue<int, PeerInfo> &E : peers_info) {
if (p_peer_id < 0 && E.key == -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.
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 (!F->value) {
} else if (!(*confirmed)) {
has_all_peers = false;
}
}
}
if (peers_to_add.size()) {
_send_confirm_path(node, psc, peers_to_add);
_send_confirm_path(node, cache, peers_to_add);
}
return has_all_peers;
@ -244,22 +271,23 @@ bool SceneCacheInterface::send_object_cache(Object *p_obj, int p_peer_id, int &r
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);
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));
PeerInfo *pinfo = peers_info.getptr(p_from);
ERR_FAIL_NULL_V(pinfo, nullptr);
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) + ".");
}
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() {
path_get_cache.clear();
path_send_cache.clear();
for (KeyValue<ObjectID, NodeCache> &E : nodes_cache) {
Object *obj = ObjectDB::get_instance(E.key);
ERR_CONTINUE(!obj);
obj->disconnect(SceneStringNames::get_singleton()->tree_exited, callable_mp(this, &SceneCacheInterface::_remove_node_cache));
}
peers_info.clear();
nodes_cache.clear();
last_send_cache_id = 1;
}

27
modules/multiplayer/scene_cache_interface.h
View File

@ -43,27 +43,26 @@ private:
SceneMultiplayer *multiplayer = nullptr;
//path sent caches
struct PathSentCache {
HashMap<int, bool> confirmed_peers;
int id;
struct NodeCache {
int cache_id;
HashMap<int, int> recv_ids; // peer id, remote cache id
HashMap<int, bool> confirmed_peers; // peer id, confirmed
};
//path get caches
struct PathGetCache {
struct NodeInfo {
NodePath path;
ObjectID instance;
struct PeerInfo {
HashMap<int, ObjectID> recv_nodes; // remote cache id, ObjectID
HashSet<ObjectID> sent_nodes;
};
HashMap<int, NodeInfo> nodes;
};
HashMap<ObjectID, PathSentCache> path_send_cache;
HashMap<int, PathGetCache> path_get_cache;
HashMap<ObjectID, NodeCache> nodes_cache;
HashMap<int, PeerInfo> peers_info;
int last_send_cache_id = 1;
void _remove_node_cache(ObjectID p_oid);
NodeCache &_track(Node *p_node);
protected:
Error _send_confirm_path(Node *p_node, PathSentCache *psc, const List<int> &p_peers);
Error _send_confirm_path(Node *p_node, NodeCache &p_cache, const List<int> &p_peers);
public:
void clear();