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/**************************************************************************/
/* scene_replication_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. */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/**************************************************************************/
# include "scene_replication_interface.h"
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# include "scene_multiplayer.h"
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# include "core/debugger/engine_debugger.h"
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# include "core/io/marshalls.h"
# include "scene/main/node.h"
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# include "scene/scene_string_names.h"
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# define MAKE_ROOM(m_amount) \
if ( packet_cache . size ( ) < m_amount ) \
packet_cache . resize ( m_amount ) ;
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# ifdef DEBUG_ENABLED
_FORCE_INLINE_ void SceneReplicationInterface : : _profile_node_data ( const String & p_what , ObjectID p_id , int p_size ) {
if ( EngineDebugger : : is_profiling ( " multiplayer:replication " ) ) {
Array values ;
values . push_back ( p_what ) ;
values . push_back ( p_id ) ;
values . push_back ( p_size ) ;
EngineDebugger : : profiler_add_frame_data ( " multiplayer:replication " , values ) ;
}
}
# endif
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SceneReplicationInterface : : TrackedNode & SceneReplicationInterface : : _track ( const ObjectID & p_id ) {
if ( ! tracked_nodes . has ( p_id ) ) {
tracked_nodes [ p_id ] = TrackedNode ( p_id ) ;
Node * node = get_id_as < Node > ( p_id ) ;
node - > connect ( SceneStringNames : : get_singleton ( ) - > tree_exited , callable_mp ( this , & SceneReplicationInterface : : _untrack ) . bind ( p_id ) , Node : : CONNECT_ONE_SHOT ) ;
}
return tracked_nodes [ p_id ] ;
}
void SceneReplicationInterface : : _untrack ( const ObjectID & p_id ) {
if ( ! tracked_nodes . has ( p_id ) ) {
return ;
}
uint32_t net_id = tracked_nodes [ p_id ] . net_id ;
uint32_t peer = tracked_nodes [ p_id ] . remote_peer ;
tracked_nodes . erase ( p_id ) ;
// If it was spawned by a remote, remove it from the received nodes.
if ( peer & & peers_info . has ( peer ) ) {
peers_info [ peer ] . recv_nodes . erase ( net_id ) ;
}
// If we spawned or synced it, we need to remove it from any peer it was sent to.
if ( net_id | | peer = = 0 ) {
for ( KeyValue < int , PeerInfo > & E : peers_info ) {
E . value . spawn_nodes . erase ( p_id ) ;
}
}
}
void SceneReplicationInterface : : _free_remotes ( const PeerInfo & p_info ) {
for ( const KeyValue < uint32_t , ObjectID > & E : p_info . recv_nodes ) {
Node * node = tracked_nodes . has ( E . value ) ? get_id_as < Node > ( E . value ) : nullptr ;
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ERR_CONTINUE ( ! node ) ;
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node - > queue_free ( ) ;
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}
}
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bool SceneReplicationInterface : : _has_authority ( const Node * p_node ) {
return multiplayer - > has_multiplayer_peer ( ) & & p_node - > get_multiplayer_authority ( ) = = multiplayer - > get_unique_id ( ) ;
}
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void SceneReplicationInterface : : on_peer_change ( int p_id , bool p_connected ) {
if ( p_connected ) {
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peers_info [ p_id ] = PeerInfo ( ) ;
for ( const ObjectID & oid : spawned_nodes ) {
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_update_spawn_visibility ( p_id , oid ) ;
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}
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for ( const ObjectID & oid : sync_nodes ) {
_update_sync_visibility ( p_id , get_id_as < MultiplayerSynchronizer > ( oid ) ) ;
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}
} else {
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ERR_FAIL_COND ( ! peers_info . has ( p_id ) ) ;
_free_remotes ( peers_info [ p_id ] ) ;
peers_info . erase ( p_id ) ;
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}
}
void SceneReplicationInterface : : on_reset ( ) {
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for ( const KeyValue < int , PeerInfo > & E : peers_info ) {
_free_remotes ( E . value ) ;
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}
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peers_info . clear ( ) ;
// Tracked nodes are cleared on deletion, here we only reset the ids so they can be later re-assigned.
for ( KeyValue < ObjectID , TrackedNode > & E : tracked_nodes ) {
TrackedNode & tobj = E . value ;
tobj . net_id = 0 ;
tobj . remote_peer = 0 ;
}
for ( const ObjectID & oid : sync_nodes ) {
MultiplayerSynchronizer * sync = get_id_as < MultiplayerSynchronizer > ( oid ) ;
ERR_CONTINUE ( ! sync ) ;
sync - > reset ( ) ;
}
last_net_id = 0 ;
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}
void SceneReplicationInterface : : on_network_process ( ) {
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// Prevent endless stalling in case of unforeseen spawn errors.
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if ( spawn_queue . size ( ) ) {
ERR_PRINT ( " An error happened during last spawn, this usually means the 'ready' signal was not emitted by the spawned node. " ) ;
for ( const ObjectID & oid : spawn_queue ) {
Node * node = get_id_as < Node > ( oid ) ;
ERR_CONTINUE ( ! node ) ;
if ( node - > is_connected ( SceneStringNames : : get_singleton ( ) - > ready , callable_mp ( this , & SceneReplicationInterface : : _node_ready ) ) ) {
node - > disconnect ( SceneStringNames : : get_singleton ( ) - > ready , callable_mp ( this , & SceneReplicationInterface : : _node_ready ) ) ;
}
}
spawn_queue . clear ( ) ;
}
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// Process syncs.
uint64_t usec = OS : : get_singleton ( ) - > get_ticks_usec ( ) ;
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for ( KeyValue < int , PeerInfo > & E : peers_info ) {
const HashSet < ObjectID > to_sync = E . value . sync_nodes ;
if ( to_sync . is_empty ( ) ) {
continue ; // Nothing to sync
}
uint16_t sync_net_time = + + E . value . last_sent_sync ;
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_send_sync ( E . key , to_sync , sync_net_time , usec ) ;
_send_delta ( E . key , to_sync , usec , E . value . last_watch_usecs ) ;
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}
}
Error SceneReplicationInterface : : on_spawn ( Object * p_obj , Variant p_config ) {
Node * node = Object : : cast_to < Node > ( p_obj ) ;
ERR_FAIL_COND_V ( ! node | | p_config . get_type ( ) ! = Variant : : OBJECT , ERR_INVALID_PARAMETER ) ;
MultiplayerSpawner * spawner = Object : : cast_to < MultiplayerSpawner > ( p_config . get_validated_object ( ) ) ;
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ERR_FAIL_NULL_V ( spawner , ERR_INVALID_PARAMETER ) ;
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// Track node.
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const ObjectID oid = node - > get_instance_id ( ) ;
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TrackedNode & tobj = _track ( oid ) ;
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// Spawn state needs to be callected after "ready", but the spawn order follows "enter_tree".
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ERR_FAIL_COND_V ( tobj . spawner ! = ObjectID ( ) , ERR_ALREADY_IN_USE ) ;
tobj . spawner = spawner - > get_instance_id ( ) ;
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spawn_queue . insert ( oid ) ;
node - > connect ( SceneStringNames : : get_singleton ( ) - > ready , callable_mp ( this , & SceneReplicationInterface : : _node_ready ) . bind ( oid ) , Node : : CONNECT_ONE_SHOT ) ;
return OK ;
}
void SceneReplicationInterface : : _node_ready ( const ObjectID & p_oid ) {
ERR_FAIL_COND ( ! spawn_queue . has ( p_oid ) ) ; // Bug.
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// If we are a nested spawn, we need to wait until the parent is ready.
if ( p_oid ! = * ( spawn_queue . begin ( ) ) ) {
return ;
}
for ( const ObjectID & oid : spawn_queue ) {
ERR_CONTINUE ( ! tracked_nodes . has ( oid ) ) ;
TrackedNode & tobj = tracked_nodes [ oid ] ;
MultiplayerSpawner * spawner = get_id_as < MultiplayerSpawner > ( tobj . spawner ) ;
ERR_CONTINUE ( ! spawner ) ;
spawned_nodes . insert ( oid ) ;
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if ( _has_authority ( spawner ) ) {
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_update_spawn_visibility ( 0 , oid ) ;
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}
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}
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spawn_queue . clear ( ) ;
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}
Error SceneReplicationInterface : : on_despawn ( Object * p_obj , Variant p_config ) {
Node * node = Object : : cast_to < Node > ( p_obj ) ;
ERR_FAIL_COND_V ( ! node | | p_config . get_type ( ) ! = Variant : : OBJECT , ERR_INVALID_PARAMETER ) ;
MultiplayerSpawner * spawner = Object : : cast_to < MultiplayerSpawner > ( p_config . get_validated_object ( ) ) ;
ERR_FAIL_COND_V ( ! p_obj | | ! spawner , ERR_INVALID_PARAMETER ) ;
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// Forcibly despawn to all peers that knowns me.
int len = 0 ;
Error err = _make_despawn_packet ( node , len ) ;
ERR_FAIL_COND_V ( err ! = OK , ERR_BUG ) ;
const ObjectID oid = p_obj - > get_instance_id ( ) ;
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for ( const KeyValue < int , PeerInfo > & E : peers_info ) {
if ( ! E . value . spawn_nodes . has ( oid ) ) {
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continue ;
}
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_send_raw ( packet_cache . ptr ( ) , len , E . key , true ) ;
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}
// Also remove spawner tracking from the replication state.
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ERR_FAIL_COND_V ( ! tracked_nodes . has ( oid ) , ERR_INVALID_PARAMETER ) ;
TrackedNode & tobj = _track ( oid ) ;
ERR_FAIL_COND_V ( tobj . spawner ! = spawner - > get_instance_id ( ) , ERR_INVALID_PARAMETER ) ;
tobj . spawner = ObjectID ( ) ;
spawned_nodes . erase ( oid ) ;
for ( KeyValue < int , PeerInfo > & E : peers_info ) {
E . value . spawn_nodes . erase ( oid ) ;
}
return OK ;
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}
Error SceneReplicationInterface : : on_replication_start ( Object * p_obj , Variant p_config ) {
Node * node = Object : : cast_to < Node > ( p_obj ) ;
ERR_FAIL_COND_V ( ! node | | p_config . get_type ( ) ! = Variant : : OBJECT , ERR_INVALID_PARAMETER ) ;
MultiplayerSynchronizer * sync = Object : : cast_to < MultiplayerSynchronizer > ( p_config . get_validated_object ( ) ) ;
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ERR_FAIL_NULL_V ( sync , ERR_INVALID_PARAMETER ) ;
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// Add to synchronizer list.
TrackedNode & tobj = _track ( p_obj - > get_instance_id ( ) ) ;
const ObjectID sid = sync - > get_instance_id ( ) ;
tobj . synchronizers . insert ( sid ) ;
sync_nodes . insert ( sid ) ;
// Update visibility.
sync - > connect ( " visibility_changed " , callable_mp ( this , & SceneReplicationInterface : : _visibility_changed ) . bind ( sync - > get_instance_id ( ) ) ) ;
_update_sync_visibility ( 0 , sync ) ;
if ( pending_spawn = = p_obj - > get_instance_id ( ) & & sync - > get_multiplayer_authority ( ) = = pending_spawn_remote ) {
// Try to apply synchronizer Net ID
ERR_FAIL_COND_V_MSG ( pending_sync_net_ids . is_empty ( ) , ERR_INVALID_DATA , vformat ( " The MultiplayerSynchronizer at path \" %s \" is unable to process the pending spawn since it has no network ID. This might happen when changing the multiplayer authority during the \" _ready \" callback. Make sure to only change the authority of multiplayer synchronizers during \" _enter_tree \" or the \" _spawn_custom \" callback of their multiplayer spawner. " , sync - > get_path ( ) ) ) ;
ERR_FAIL_COND_V ( ! peers_info . has ( pending_spawn_remote ) , ERR_INVALID_DATA ) ;
uint32_t net_id = pending_sync_net_ids [ 0 ] ;
pending_sync_net_ids . pop_front ( ) ;
peers_info [ pending_spawn_remote ] . recv_sync_ids [ net_id ] = sync - > get_instance_id ( ) ;
// Try to apply spawn state (before ready).
if ( pending_buffer_size > 0 ) {
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ERR_FAIL_COND_V ( ! node | | ! sync - > get_replication_config_ptr ( ) , ERR_UNCONFIGURED ) ;
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int consumed = 0 ;
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const List < NodePath > props = sync - > get_replication_config_ptr ( ) - > get_spawn_properties ( ) ;
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Vector < Variant > vars ;
vars . resize ( props . size ( ) ) ;
Error err = MultiplayerAPI : : decode_and_decompress_variants ( vars , pending_buffer , pending_buffer_size , consumed ) ;
ERR_FAIL_COND_V ( err , err ) ;
if ( consumed > 0 ) {
pending_buffer + = consumed ;
pending_buffer_size - = consumed ;
err = MultiplayerSynchronizer : : set_state ( props , node , vars ) ;
ERR_FAIL_COND_V ( err , err ) ;
}
}
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}
return OK ;
}
Error SceneReplicationInterface : : on_replication_stop ( Object * p_obj , Variant p_config ) {
Node * node = Object : : cast_to < Node > ( p_obj ) ;
ERR_FAIL_COND_V ( ! node | | p_config . get_type ( ) ! = Variant : : OBJECT , ERR_INVALID_PARAMETER ) ;
MultiplayerSynchronizer * sync = Object : : cast_to < MultiplayerSynchronizer > ( p_config . get_validated_object ( ) ) ;
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ERR_FAIL_NULL_V ( sync , ERR_INVALID_PARAMETER ) ;
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sync - > disconnect ( " visibility_changed " , callable_mp ( this , & SceneReplicationInterface : : _visibility_changed ) ) ;
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// Untrack synchronizer.
const ObjectID oid = node - > get_instance_id ( ) ;
const ObjectID sid = sync - > get_instance_id ( ) ;
ERR_FAIL_COND_V ( ! tracked_nodes . has ( oid ) , ERR_INVALID_PARAMETER ) ;
TrackedNode & tobj = _track ( oid ) ;
tobj . synchronizers . erase ( sid ) ;
sync_nodes . erase ( sid ) ;
for ( KeyValue < int , PeerInfo > & E : peers_info ) {
E . value . sync_nodes . erase ( sid ) ;
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E . value . last_watch_usecs . erase ( sid ) ;
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if ( sync - > get_net_id ( ) ) {
E . value . recv_sync_ids . erase ( sync - > get_net_id ( ) ) ;
}
}
return OK ;
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}
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void SceneReplicationInterface : : _visibility_changed ( int p_peer , ObjectID p_sid ) {
MultiplayerSynchronizer * sync = get_id_as < MultiplayerSynchronizer > ( p_sid ) ;
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ERR_FAIL_NULL ( sync ) ; // Bug.
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Node * node = sync - > get_root_node ( ) ;
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ERR_FAIL_NULL ( node ) ; // Bug.
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const ObjectID oid = node - > get_instance_id ( ) ;
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if ( spawned_nodes . has ( oid ) & & p_peer ! = multiplayer - > get_unique_id ( ) ) {
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_update_spawn_visibility ( p_peer , oid ) ;
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}
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_update_sync_visibility ( p_peer , sync ) ;
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}
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bool SceneReplicationInterface : : is_rpc_visible ( const ObjectID & p_oid , int p_peer ) const {
if ( ! tracked_nodes . has ( p_oid ) ) {
return true ; // Untracked nodes are always visible to RPCs.
}
ERR_FAIL_COND_V ( p_peer < 0 , false ) ;
const TrackedNode & tnode = tracked_nodes [ p_oid ] ;
if ( tnode . synchronizers . is_empty ( ) ) {
return true ; // No synchronizers means no visibility restrictions.
}
if ( tnode . remote_peer & & uint32_t ( p_peer ) = = tnode . remote_peer ) {
return true ; // RPCs on spawned nodes are always visible to spawner.
} else if ( spawned_nodes . has ( p_oid ) ) {
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// It's a spawned node we control, this can be fast.
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if ( p_peer ) {
return peers_info . has ( p_peer ) & & peers_info [ p_peer ] . spawn_nodes . has ( p_oid ) ;
} else {
for ( const KeyValue < int , PeerInfo > & E : peers_info ) {
if ( ! E . value . spawn_nodes . has ( p_oid ) ) {
return false ; // Not public.
}
}
return true ; // All peers have this node.
}
} else {
// Cycle object synchronizers to check visibility.
for ( const ObjectID & sid : tnode . synchronizers ) {
MultiplayerSynchronizer * sync = get_id_as < MultiplayerSynchronizer > ( sid ) ;
ERR_CONTINUE ( ! sync ) ;
// RPC visibility is composed using OR when multiple synchronizers are present.
// Note that we don't really care about authority here which may lead to unexpected
// results when using multiple synchronizers to control the same node.
if ( sync - > is_visible_to ( p_peer ) ) {
return true ;
}
}
return false ; // Not visible.
}
}
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Error SceneReplicationInterface : : _update_sync_visibility ( int p_peer , MultiplayerSynchronizer * p_sync ) {
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ERR_FAIL_NULL_V ( p_sync , ERR_BUG ) ;
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if ( ! _has_authority ( p_sync ) | | p_peer = = multiplayer - > get_unique_id ( ) ) {
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return OK ;
}
const ObjectID & sid = p_sync - > get_instance_id ( ) ;
bool is_visible = p_sync - > is_visible_to ( p_peer ) ;
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if ( p_peer = = 0 ) {
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for ( KeyValue < int , PeerInfo > & E : peers_info ) {
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// Might be visible to this specific peer.
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bool is_visible_to_peer = is_visible | | p_sync - > is_visible_to ( E . key ) ;
if ( is_visible_to_peer = = E . value . sync_nodes . has ( sid ) ) {
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continue ;
}
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if ( is_visible_to_peer ) {
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E . value . sync_nodes . insert ( sid ) ;
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} else {
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E . value . sync_nodes . erase ( sid ) ;
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E . value . last_watch_usecs . erase ( sid ) ;
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}
}
return OK ;
} else {
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ERR_FAIL_COND_V ( ! peers_info . has ( p_peer ) , ERR_INVALID_PARAMETER ) ;
if ( is_visible = = peers_info [ p_peer ] . sync_nodes . has ( sid ) ) {
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return OK ;
}
if ( is_visible ) {
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peers_info [ p_peer ] . sync_nodes . insert ( sid ) ;
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} else {
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peers_info [ p_peer ] . sync_nodes . erase ( sid ) ;
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peers_info [ p_peer ] . last_watch_usecs . erase ( sid ) ;
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}
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return OK ;
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}
}
Error SceneReplicationInterface : : _update_spawn_visibility ( int p_peer , const ObjectID & p_oid ) {
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const TrackedNode * tnode = tracked_nodes . getptr ( p_oid ) ;
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ERR_FAIL_NULL_V ( tnode , ERR_BUG ) ;
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MultiplayerSpawner * spawner = get_id_as < MultiplayerSpawner > ( tnode - > spawner ) ;
Node * node = get_id_as < Node > ( p_oid ) ;
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ERR_FAIL_NULL_V ( node , ERR_BUG ) ;
ERR_FAIL_NULL_V ( spawner , ERR_BUG ) ;
ERR_FAIL_COND_V ( ! _has_authority ( spawner ) , ERR_BUG ) ;
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ERR_FAIL_COND_V ( ! tracked_nodes . has ( p_oid ) , ERR_BUG ) ;
const HashSet < ObjectID > synchronizers = tracked_nodes [ p_oid ] . synchronizers ;
bool is_visible = true ;
for ( const ObjectID & sid : synchronizers ) {
MultiplayerSynchronizer * sync = get_id_as < MultiplayerSynchronizer > ( sid ) ;
ERR_CONTINUE ( ! sync ) ;
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if ( ! _has_authority ( sync ) ) {
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continue ;
}
// Spawn visibility is composed using OR when multiple synchronizers are present.
if ( sync - > is_visible_to ( p_peer ) ) {
is_visible = true ;
break ;
}
is_visible = false ;
}
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// Spawn (and despawn) when needed.
HashSet < int > to_spawn ;
HashSet < int > to_despawn ;
if ( p_peer ) {
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ERR_FAIL_COND_V ( ! peers_info . has ( p_peer ) , ERR_INVALID_PARAMETER ) ;
if ( is_visible = = peers_info [ p_peer ] . spawn_nodes . has ( p_oid ) ) {
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return OK ;
}
if ( is_visible ) {
to_spawn . insert ( p_peer ) ;
} else {
to_despawn . insert ( p_peer ) ;
}
} else {
// Check visibility for each peers.
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for ( const KeyValue < int , PeerInfo > & E : peers_info ) {
if ( is_visible ) {
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// This is fast, since the the object is visible to everyone, we don't need to check each peer.
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if ( E . value . spawn_nodes . has ( p_oid ) ) {
// Already spawned.
continue ;
}
to_spawn . insert ( E . key ) ;
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} else {
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// Need to check visibility for each peer.
_update_spawn_visibility ( E . key , p_oid ) ;
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}
}
}
if ( to_spawn . size ( ) ) {
int len = 0 ;
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_make_spawn_packet ( node , spawner , len ) ;
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for ( int pid : to_spawn ) {
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ERR_CONTINUE ( ! peers_info . has ( pid ) ) ;
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int path_id ;
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multiplayer_cache - > send_object_cache ( spawner , pid , path_id ) ;
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_send_raw ( packet_cache . ptr ( ) , len , pid , true ) ;
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peers_info [ pid ] . spawn_nodes . insert ( p_oid ) ;
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}
}
if ( to_despawn . size ( ) ) {
int len = 0 ;
_make_despawn_packet ( node , len ) ;
for ( int pid : to_despawn ) {
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ERR_CONTINUE ( ! peers_info . has ( pid ) ) ;
peers_info [ pid ] . spawn_nodes . erase ( p_oid ) ;
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_send_raw ( packet_cache . ptr ( ) , len , pid , true ) ;
}
}
return OK ;
}
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Error SceneReplicationInterface : : _send_raw ( const uint8_t * p_buffer , int p_size , int p_peer , bool p_reliable ) {
ERR_FAIL_COND_V ( ! p_buffer | | p_size < 1 , ERR_INVALID_PARAMETER ) ;
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Ref < MultiplayerPeer > peer = multiplayer - > get_multiplayer_peer ( ) ;
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ERR_FAIL_COND_V ( peer . is_null ( ) , ERR_UNCONFIGURED ) ;
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peer - > set_transfer_channel ( 0 ) ;
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peer - > set_transfer_mode ( p_reliable ? MultiplayerPeer : : TRANSFER_MODE_RELIABLE : MultiplayerPeer : : TRANSFER_MODE_UNRELIABLE ) ;
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return multiplayer - > send_command ( p_peer , p_buffer , p_size ) ;
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}
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Error SceneReplicationInterface : : _make_spawn_packet ( Node * p_node , MultiplayerSpawner * p_spawner , int & r_len ) {
ERR_FAIL_COND_V ( ! multiplayer | | ! p_node | | ! p_spawner , ERR_BUG ) ;
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const ObjectID oid = p_node - > get_instance_id ( ) ;
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TrackedNode * tnode = tracked_nodes . getptr ( oid ) ;
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ERR_FAIL_NULL_V ( tnode , ERR_INVALID_PARAMETER ) ;
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if ( tnode - > net_id = = 0 ) {
// Ensure the node has an ID.
tnode - > net_id = + + last_net_id ;
}
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uint32_t nid = tnode - > net_id ;
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ERR_FAIL_COND_V ( ! nid , ERR_UNCONFIGURED ) ;
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// Prepare custom arg and scene_id
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uint8_t scene_id = p_spawner - > find_spawnable_scene_index_from_object ( oid ) ;
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bool is_custom = scene_id = = MultiplayerSpawner : : INVALID_ID ;
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Variant spawn_arg = p_spawner - > get_spawn_argument ( oid ) ;
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int spawn_arg_size = 0 ;
if ( is_custom ) {
Error err = MultiplayerAPI : : encode_and_compress_variant ( spawn_arg , nullptr , spawn_arg_size , false ) ;
ERR_FAIL_COND_V ( err , err ) ;
}
// Prepare spawn state.
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List < NodePath > state_props ;
List < uint32_t > sync_ids ;
const HashSet < ObjectID > synchronizers = tnode - > synchronizers ;
for ( const ObjectID & sid : synchronizers ) {
MultiplayerSynchronizer * sync = get_id_as < MultiplayerSynchronizer > ( sid ) ;
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if ( ! _has_authority ( sync ) ) {
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continue ;
}
ERR_CONTINUE ( ! sync ) ;
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ERR_FAIL_NULL_V ( sync - > get_replication_config_ptr ( ) , ERR_BUG ) ;
for ( const NodePath & prop : sync - > get_replication_config_ptr ( ) - > get_spawn_properties ( ) ) {
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state_props . push_back ( prop ) ;
}
// Ensure the synchronizer has an ID.
if ( sync - > get_net_id ( ) = = 0 ) {
sync - > set_net_id ( + + last_net_id ) ;
}
sync_ids . push_back ( sync - > get_net_id ( ) ) ;
}
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int state_size = 0 ;
Vector < Variant > state_vars ;
Vector < const Variant * > state_varp ;
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if ( state_props . size ( ) ) {
Error err = MultiplayerSynchronizer : : get_state ( state_props , p_node , state_vars , state_varp ) ;
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ERR_FAIL_COND_V_MSG ( err ! = OK , err , " Unable to retrieve spawn state. " ) ;
err = MultiplayerAPI : : encode_and_compress_variants ( state_varp . ptrw ( ) , state_varp . size ( ) , nullptr , state_size ) ;
ERR_FAIL_COND_V_MSG ( err ! = OK , err , " Unable to encode spawn state. " ) ;
}
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// Encode scene ID, path ID, net ID, node name.
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int path_id = multiplayer_cache - > make_object_cache ( p_spawner ) ;
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CharString cname = p_node - > get_name ( ) . operator String ( ) . utf8 ( ) ;
int nlen = encode_cstring ( cname . get_data ( ) , nullptr ) ;
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MAKE_ROOM ( 1 + 1 + 4 + 4 + 4 + 4 * sync_ids . size ( ) + 4 + nlen + ( is_custom ? 4 + spawn_arg_size : 0 ) + state_size ) ;
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uint8_t * ptr = packet_cache . ptrw ( ) ;
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ptr [ 0 ] = ( uint8_t ) SceneMultiplayer : : NETWORK_COMMAND_SPAWN ;
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ptr [ 1 ] = scene_id ;
int ofs = 2 ;
ofs + = encode_uint32 ( path_id , & ptr [ ofs ] ) ;
ofs + = encode_uint32 ( nid , & ptr [ ofs ] ) ;
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ofs + = encode_uint32 ( sync_ids . size ( ) , & ptr [ ofs ] ) ;
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ofs + = encode_uint32 ( nlen , & ptr [ ofs ] ) ;
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for ( uint32_t snid : sync_ids ) {
ofs + = encode_uint32 ( snid , & ptr [ ofs ] ) ;
}
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ofs + = encode_cstring ( cname . get_data ( ) , & ptr [ ofs ] ) ;
// Write args
if ( is_custom ) {
ofs + = encode_uint32 ( spawn_arg_size , & ptr [ ofs ] ) ;
Error err = MultiplayerAPI : : encode_and_compress_variant ( spawn_arg , & ptr [ ofs ] , spawn_arg_size , false ) ;
ERR_FAIL_COND_V ( err , err ) ;
ofs + = spawn_arg_size ;
}
// Write state.
if ( state_size ) {
Error err = MultiplayerAPI : : encode_and_compress_variants ( state_varp . ptrw ( ) , state_varp . size ( ) , & ptr [ ofs ] , state_size ) ;
ERR_FAIL_COND_V ( err , err ) ;
ofs + = state_size ;
}
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r_len = ofs ;
return OK ;
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}
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Error SceneReplicationInterface : : _make_despawn_packet ( Node * p_node , int & r_len ) {
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const ObjectID oid = p_node - > get_instance_id ( ) ;
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const TrackedNode * tnode = tracked_nodes . getptr ( oid ) ;
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ERR_FAIL_NULL_V ( tnode , ERR_INVALID_PARAMETER ) ;
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MAKE_ROOM ( 5 ) ;
uint8_t * ptr = packet_cache . ptrw ( ) ;
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ptr [ 0 ] = ( uint8_t ) SceneMultiplayer : : NETWORK_COMMAND_DESPAWN ;
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int ofs = 1 ;
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uint32_t nid = tnode - > net_id ;
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ofs + = encode_uint32 ( nid , & ptr [ ofs ] ) ;
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r_len = ofs ;
return OK ;
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}
Error SceneReplicationInterface : : on_spawn_receive ( int p_from , const uint8_t * p_buffer , int p_buffer_len ) {
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ERR_FAIL_COND_V_MSG ( p_buffer_len < 18 , ERR_INVALID_DATA , " Invalid spawn packet received " ) ;
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int ofs = 1 ; // The spawn/despawn command.
uint8_t scene_id = p_buffer [ ofs ] ;
ofs + = 1 ;
uint32_t node_target = decode_uint32 ( & p_buffer [ ofs ] ) ;
ofs + = 4 ;
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MultiplayerSpawner * spawner = Object : : cast_to < MultiplayerSpawner > ( multiplayer_cache - > get_cached_object ( p_from , node_target ) ) ;
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ERR_FAIL_NULL_V ( spawner , ERR_DOES_NOT_EXIST ) ;
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ERR_FAIL_COND_V ( p_from ! = spawner - > get_multiplayer_authority ( ) , ERR_UNAUTHORIZED ) ;
uint32_t net_id = decode_uint32 ( & p_buffer [ ofs ] ) ;
ofs + = 4 ;
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uint32_t sync_len = decode_uint32 ( & p_buffer [ ofs ] ) ;
ofs + = 4 ;
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uint32_t name_len = decode_uint32 ( & p_buffer [ ofs ] ) ;
ofs + = 4 ;
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ERR_FAIL_COND_V_MSG ( name_len + ( sync_len * 4 ) > uint32_t ( p_buffer_len - ofs ) , ERR_INVALID_DATA , vformat ( " Invalid spawn packet size: %d, wants: %d " , p_buffer_len , ofs + name_len + ( sync_len * 4 ) ) ) ;
List < uint32_t > sync_ids ;
for ( uint32_t i = 0 ; i < sync_len ; i + + ) {
sync_ids . push_back ( decode_uint32 ( & p_buffer [ ofs ] ) ) ;
ofs + = 4 ;
}
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ERR_FAIL_COND_V_MSG ( name_len < 1 , ERR_INVALID_DATA , " Zero spawn name size. " ) ;
// We need to make sure no trickery happens here, but we want to allow autogenerated ("@") node names.
const String name = String : : utf8 ( ( const char * ) & p_buffer [ ofs ] , name_len ) ;
ERR_FAIL_COND_V_MSG ( name . validate_node_name ( ) ! = name , ERR_INVALID_DATA , vformat ( " Invalid node name received: '%s'. Make sure to add nodes via 'add_child(node, true)' remotely. " , name ) ) ;
ofs + = name_len ;
// Check that we can spawn.
Node * parent = spawner - > get_node_or_null ( spawner - > get_spawn_path ( ) ) ;
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ERR_FAIL_NULL_V ( parent , ERR_UNCONFIGURED ) ;
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ERR_FAIL_COND_V ( parent - > has_node ( name ) , ERR_INVALID_DATA ) ;
Node * node = nullptr ;
if ( scene_id = = MultiplayerSpawner : : INVALID_ID ) {
// Custom spawn.
ERR_FAIL_COND_V ( p_buffer_len - ofs < 4 , ERR_INVALID_DATA ) ;
uint32_t arg_size = decode_uint32 ( & p_buffer [ ofs ] ) ;
ofs + = 4 ;
ERR_FAIL_COND_V ( arg_size > uint32_t ( p_buffer_len - ofs ) , ERR_INVALID_DATA ) ;
Variant v ;
Error err = MultiplayerAPI : : decode_and_decompress_variant ( v , & p_buffer [ ofs ] , arg_size , nullptr , false ) ;
ERR_FAIL_COND_V ( err ! = OK , err ) ;
ofs + = arg_size ;
node = spawner - > instantiate_custom ( v ) ;
} else {
// Scene based spawn.
node = spawner - > instantiate_scene ( scene_id ) ;
}
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ERR_FAIL_NULL_V ( node , ERR_UNAUTHORIZED ) ;
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node - > set_name ( name ) ;
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// Add and track remote
ERR_FAIL_COND_V ( ! peers_info . has ( p_from ) , ERR_UNAVAILABLE ) ;
ERR_FAIL_COND_V ( peers_info [ p_from ] . recv_nodes . has ( net_id ) , ERR_ALREADY_IN_USE ) ;
ObjectID oid = node - > get_instance_id ( ) ;
TrackedNode & tobj = _track ( oid ) ;
tobj . spawner = spawner - > get_instance_id ( ) ;
tobj . net_id = net_id ;
tobj . remote_peer = p_from ;
peers_info [ p_from ] . recv_nodes [ net_id ] = oid ;
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// The initial state will be applied during the sync config (i.e. before _ready).
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pending_spawn = node - > get_instance_id ( ) ;
pending_spawn_remote = p_from ;
pending_buffer_size = p_buffer_len - ofs ;
pending_buffer = pending_buffer_size > 0 ? & p_buffer [ ofs ] : nullptr ;
pending_sync_net_ids = sync_ids ;
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parent - > add_child ( node ) ;
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spawner - > emit_signal ( SNAME ( " spawned " ) , node ) ;
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pending_spawn = ObjectID ( ) ;
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pending_spawn_remote = 0 ;
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pending_buffer = nullptr ;
pending_buffer_size = 0 ;
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if ( pending_sync_net_ids . size ( ) ) {
pending_sync_net_ids . clear ( ) ;
ERR_FAIL_V ( ERR_INVALID_DATA ) ; // Should have been consumed.
}
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return OK ;
}
Error SceneReplicationInterface : : on_despawn_receive ( int p_from , const uint8_t * p_buffer , int p_buffer_len ) {
ERR_FAIL_COND_V_MSG ( p_buffer_len < 5 , ERR_INVALID_DATA , " Invalid spawn packet received " ) ;
int ofs = 1 ; // The spawn/despawn command.
uint32_t net_id = decode_uint32 ( & p_buffer [ ofs ] ) ;
ofs + = 4 ;
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// Untrack remote
ERR_FAIL_COND_V ( ! peers_info . has ( p_from ) , ERR_UNAUTHORIZED ) ;
PeerInfo & pinfo = peers_info [ p_from ] ;
ERR_FAIL_COND_V ( ! pinfo . recv_nodes . has ( net_id ) , ERR_UNAUTHORIZED ) ;
Node * node = get_id_as < Node > ( pinfo . recv_nodes [ net_id ] ) ;
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ERR_FAIL_NULL_V ( node , ERR_BUG ) ;
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pinfo . recv_nodes . erase ( net_id ) ;
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const ObjectID oid = node - > get_instance_id ( ) ;
ERR_FAIL_COND_V ( ! tracked_nodes . has ( oid ) , ERR_BUG ) ;
MultiplayerSpawner * spawner = get_id_as < MultiplayerSpawner > ( tracked_nodes [ oid ] . spawner ) ;
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ERR_FAIL_NULL_V ( spawner , ERR_DOES_NOT_EXIST ) ;
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ERR_FAIL_COND_V ( p_from ! = spawner - > get_multiplayer_authority ( ) , ERR_UNAUTHORIZED ) ;
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if ( node - > get_parent ( ) ! = nullptr ) {
node - > get_parent ( ) - > remove_child ( node ) ;
}
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node - > queue_free ( ) ;
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spawner - > emit_signal ( SNAME ( " despawned " ) , node ) ;
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return OK ;
}
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bool SceneReplicationInterface : : _verify_synchronizer ( int p_peer , MultiplayerSynchronizer * p_sync , uint32_t & r_net_id ) {
r_net_id = p_sync - > get_net_id ( ) ;
if ( r_net_id = = 0 | | ( r_net_id & 0x80000000 ) ) {
int path_id = 0 ;
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bool verified = multiplayer_cache - > send_object_cache ( p_sync , p_peer , path_id ) ;
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ERR_FAIL_COND_V_MSG ( path_id < 0 , false , " This should never happen! " ) ;
if ( r_net_id = = 0 ) {
// First time path based ID.
r_net_id = path_id | 0x80000000 ;
p_sync - > set_net_id ( r_net_id | 0x80000000 ) ;
}
return verified ;
}
return true ;
}
MultiplayerSynchronizer * SceneReplicationInterface : : _find_synchronizer ( int p_peer , uint32_t p_net_id ) {
MultiplayerSynchronizer * sync = nullptr ;
if ( p_net_id & 0x80000000 ) {
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sync = Object : : cast_to < MultiplayerSynchronizer > ( multiplayer_cache - > get_cached_object ( p_peer , p_net_id & 0x7FFFFFFF ) ) ;
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} else if ( peers_info [ p_peer ] . recv_sync_ids . has ( p_net_id ) ) {
const ObjectID & sid = peers_info [ p_peer ] . recv_sync_ids [ p_net_id ] ;
sync = get_id_as < MultiplayerSynchronizer > ( sid ) ;
}
return sync ;
}
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void SceneReplicationInterface : : _send_delta ( int p_peer , const HashSet < ObjectID > & p_synchronizers , uint64_t p_usec , const HashMap < ObjectID , uint64_t > & p_last_watch_usecs ) {
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MAKE_ROOM ( /* header */ 1 + /* element */ 4 + 8 + 4 + delta_mtu ) ;
uint8_t * ptr = packet_cache . ptrw ( ) ;
ptr [ 0 ] = SceneMultiplayer : : NETWORK_COMMAND_SYNC | ( 1 < < SceneMultiplayer : : CMD_FLAG_0_SHIFT ) ;
int ofs = 1 ;
for ( const ObjectID & oid : p_synchronizers ) {
MultiplayerSynchronizer * sync = get_id_as < MultiplayerSynchronizer > ( oid ) ;
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ERR_CONTINUE ( ! sync | | ! sync - > get_replication_config_ptr ( ) | | ! _has_authority ( sync ) ) ;
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uint32_t net_id ;
if ( ! _verify_synchronizer ( p_peer , sync , net_id ) ) {
continue ;
}
uint64_t last_usec = p_last_watch_usecs . has ( oid ) ? p_last_watch_usecs [ oid ] : 0 ;
uint64_t indexes ;
List < Variant > delta = sync - > get_delta_state ( p_usec , last_usec , indexes ) ;
if ( ! delta . size ( ) ) {
continue ; // Nothing to update.
}
Vector < const Variant * > varp ;
varp . resize ( delta . size ( ) ) ;
const Variant * * vptr = varp . ptrw ( ) ;
int i = 0 ;
for ( const Variant & v : delta ) {
vptr [ i ] = & v ;
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i + + ;
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}
int size ;
Error err = MultiplayerAPI : : encode_and_compress_variants ( vptr , varp . size ( ) , nullptr , size ) ;
ERR_CONTINUE_MSG ( err ! = OK , " Unable to encode delta state. " ) ;
ERR_CONTINUE_MSG ( size > delta_mtu , vformat ( " Synchronizer delta bigger than MTU will not be sent (%d > %d): %s " , size , delta_mtu , sync - > get_path ( ) ) ) ;
if ( ofs + 4 + 8 + 4 + size > delta_mtu ) {
// Send what we got, and reset write.
_send_raw ( packet_cache . ptr ( ) , ofs , p_peer , true ) ;
ofs = 1 ;
}
if ( size ) {
ofs + = encode_uint32 ( sync - > get_net_id ( ) , & ptr [ ofs ] ) ;
ofs + = encode_uint64 ( indexes , & ptr [ ofs ] ) ;
ofs + = encode_uint32 ( size , & ptr [ ofs ] ) ;
MultiplayerAPI : : encode_and_compress_variants ( vptr , varp . size ( ) , & ptr [ ofs ] , size ) ;
ofs + = size ;
}
# ifdef DEBUG_ENABLED
_profile_node_data ( " delta_out " , oid , size ) ;
# endif
peers_info [ p_peer ] . last_watch_usecs [ oid ] = p_usec ;
}
if ( ofs > 1 ) {
// Got some left over to send.
_send_raw ( packet_cache . ptr ( ) , ofs , p_peer , true ) ;
}
}
Error SceneReplicationInterface : : on_delta_receive ( int p_from , const uint8_t * p_buffer , int p_buffer_len ) {
int ofs = 1 ;
while ( ofs + 4 + 8 + 4 < p_buffer_len ) {
uint32_t net_id = decode_uint32 ( & p_buffer [ ofs ] ) ;
ofs + = 4 ;
uint64_t indexes = decode_uint64 ( & p_buffer [ ofs ] ) ;
ofs + = 8 ;
uint32_t size = decode_uint32 ( & p_buffer [ ofs ] ) ;
ofs + = 4 ;
ERR_FAIL_COND_V ( size > uint32_t ( p_buffer_len - ofs ) , ERR_INVALID_DATA ) ;
MultiplayerSynchronizer * sync = _find_synchronizer ( p_from , net_id ) ;
Node * node = sync ? sync - > get_root_node ( ) : nullptr ;
if ( ! sync | | sync - > get_multiplayer_authority ( ) ! = p_from | | ! node ) {
ofs + = size ;
ERR_CONTINUE_MSG ( true , " Ignoring delta for non-authority or invalid synchronizer. " ) ;
}
List < NodePath > props = sync - > get_delta_properties ( indexes ) ;
ERR_FAIL_COND_V ( props . size ( ) = = 0 , ERR_INVALID_DATA ) ;
Vector < Variant > vars ;
vars . resize ( props . size ( ) ) ;
int consumed = 0 ;
Error err = MultiplayerAPI : : decode_and_decompress_variants ( vars , p_buffer + ofs , size , consumed ) ;
ERR_FAIL_COND_V ( err ! = OK , err ) ;
ERR_FAIL_COND_V ( uint32_t ( consumed ) ! = size , ERR_INVALID_DATA ) ;
err = MultiplayerSynchronizer : : set_state ( props , node , vars ) ;
ERR_FAIL_COND_V ( err ! = OK , err ) ;
ofs + = size ;
sync - > emit_signal ( SNAME ( " delta_synchronized " ) ) ;
# ifdef DEBUG_ENABLED
_profile_node_data ( " delta_in " , sync - > get_instance_id ( ) , size ) ;
# endif
}
return OK ;
}
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void SceneReplicationInterface : : _send_sync ( int p_peer , const HashSet < ObjectID > & p_synchronizers , uint16_t p_sync_net_time , uint64_t p_usec ) {
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MAKE_ROOM ( /* header */ 3 + /* element */ 4 + 4 + sync_mtu ) ;
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uint8_t * ptr = packet_cache . ptrw ( ) ;
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ptr [ 0 ] = SceneMultiplayer : : NETWORK_COMMAND_SYNC ;
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int ofs = 1 ;
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ofs + = encode_uint16 ( p_sync_net_time , & ptr [ 1 ] ) ;
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// Can only send updates for already notified nodes.
// This is a lazy implementation, we could optimize much more here with by grouping by replication config.
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for ( const ObjectID & oid : p_synchronizers ) {
MultiplayerSynchronizer * sync = get_id_as < MultiplayerSynchronizer > ( oid ) ;
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ERR_CONTINUE ( ! sync | | ! sync - > get_replication_config_ptr ( ) | | ! _has_authority ( sync ) ) ;
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if ( ! sync - > update_outbound_sync_time ( p_usec ) ) {
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continue ; // nothing to sync.
}
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Node * node = sync - > get_root_node ( ) ;
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ERR_CONTINUE ( ! node ) ;
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uint32_t net_id = sync - > get_net_id ( ) ;
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if ( ! _verify_synchronizer ( p_peer , sync , net_id ) ) {
// The path based sync is not yet confirmed, skipping.
continue ;
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}
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int size ;
Vector < Variant > vars ;
Vector < const Variant * > varp ;
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const List < NodePath > props = sync - > get_replication_config_ptr ( ) - > get_sync_properties ( ) ;
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Error err = MultiplayerSynchronizer : : get_state ( props , node , vars , varp ) ;
ERR_CONTINUE_MSG ( err ! = OK , " Unable to retrieve sync state. " ) ;
err = MultiplayerAPI : : encode_and_compress_variants ( varp . ptrw ( ) , varp . size ( ) , nullptr , size ) ;
ERR_CONTINUE_MSG ( err ! = OK , " Unable to encode sync state. " ) ;
// TODO Handle single state above MTU.
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ERR_CONTINUE_MSG ( size > sync_mtu , vformat ( " Node states bigger than MTU will not be sent (%d > %d): %s " , size , sync_mtu , node - > get_path ( ) ) ) ;
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if ( ofs + 4 + 4 + size > sync_mtu ) {
// Send what we got, and reset write.
_send_raw ( packet_cache . ptr ( ) , ofs , p_peer , false ) ;
ofs = 3 ;
}
if ( size ) {
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ofs + = encode_uint32 ( sync - > get_net_id ( ) , & ptr [ ofs ] ) ;
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ofs + = encode_uint32 ( size , & ptr [ ofs ] ) ;
MultiplayerAPI : : encode_and_compress_variants ( varp . ptrw ( ) , varp . size ( ) , & ptr [ ofs ] , size ) ;
ofs + = size ;
}
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# ifdef DEBUG_ENABLED
_profile_node_data ( " sync_out " , oid , size ) ;
# endif
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}
if ( ofs > 3 ) {
// Got some left over to send.
_send_raw ( packet_cache . ptr ( ) , ofs , p_peer , false ) ;
}
}
Error SceneReplicationInterface : : on_sync_receive ( int p_from , const uint8_t * p_buffer , int p_buffer_len ) {
ERR_FAIL_COND_V_MSG ( p_buffer_len < 11 , ERR_INVALID_DATA , " Invalid sync packet received " ) ;
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bool is_delta = ( p_buffer [ 0 ] & ( 1 < < SceneMultiplayer : : CMD_FLAG_0_SHIFT ) ) ! = 0 ;
if ( is_delta ) {
return on_delta_receive ( p_from , p_buffer , p_buffer_len ) ;
}
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uint16_t time = decode_uint16 ( & p_buffer [ 1 ] ) ;
int ofs = 3 ;
while ( ofs + 8 < p_buffer_len ) {
uint32_t net_id = decode_uint32 ( & p_buffer [ ofs ] ) ;
ofs + = 4 ;
uint32_t size = decode_uint32 ( & p_buffer [ ofs ] ) ;
ofs + = 4 ;
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ERR_FAIL_COND_V ( size > uint32_t ( p_buffer_len - ofs ) , ERR_INVALID_DATA ) ;
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MultiplayerSynchronizer * sync = _find_synchronizer ( p_from , net_id ) ;
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if ( ! sync ) {
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// Not received yet.
ofs + = size ;
continue ;
}
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Node * node = sync - > get_root_node ( ) ;
if ( sync - > get_multiplayer_authority ( ) ! = p_from | | ! node ) {
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// Not valid for me.
ofs + = size ;
ERR_CONTINUE_MSG ( true , " Ignoring sync data from non-authority or for missing node. " ) ;
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}
if ( ! sync - > update_inbound_sync_time ( time ) ) {
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// State is too old.
ofs + = size ;
continue ;
}
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const List < NodePath > props = sync - > get_replication_config_ptr ( ) - > get_sync_properties ( ) ;
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Vector < Variant > vars ;
vars . resize ( props . size ( ) ) ;
int consumed ;
Error err = MultiplayerAPI : : decode_and_decompress_variants ( vars , & p_buffer [ ofs ] , size , consumed ) ;
ERR_FAIL_COND_V ( err , err ) ;
err = MultiplayerSynchronizer : : set_state ( props , node , vars ) ;
ERR_FAIL_COND_V ( err , err ) ;
ofs + = size ;
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sync - > emit_signal ( SNAME ( " synchronized " ) ) ;
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# ifdef DEBUG_ENABLED
_profile_node_data ( " sync_in " , sync - > get_instance_id ( ) , size ) ;
# endif
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}
return OK ;
}
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void SceneReplicationInterface : : set_max_sync_packet_size ( int p_size ) {
ERR_FAIL_COND_MSG ( p_size < 128 , " Sync maximum packet size must be at least 128 bytes. " ) ;
sync_mtu = p_size ;
}
int SceneReplicationInterface : : get_max_sync_packet_size ( ) const {
return sync_mtu ;
}
void SceneReplicationInterface : : set_max_delta_packet_size ( int p_size ) {
ERR_FAIL_COND_MSG ( p_size < 128 , " Sync maximum packet size must be at least 128 bytes. " ) ;
delta_mtu = p_size ;
}
int SceneReplicationInterface : : get_max_delta_packet_size ( ) const {
return delta_mtu ;
}