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godot/modules/multiplayer/scene_rpc_interface.cpp

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/*************************************************************************/
/* scene_rpc_interface.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* 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_rpc_interface.h"
#include "core/debugger/engine_debugger.h"
#include "core/io/marshalls.h"
#include "scene/main/multiplayer_api.h"
#include "scene/main/node.h"
#include "scene/main/window.h"
#include "scene_multiplayer.h"
// The RPC meta is composed by a single byte that contains (starting from the least significant bit):
// - `NetworkCommands` in the first four bits.
// - `NetworkNodeIdCompression` in the next 2 bits.
// - `NetworkNameIdCompression` in the next 1 bit.
// - `byte_only_or_no_args` in the next 1 bit.
#define NODE_ID_COMPRESSION_SHIFT SceneMultiplayer::CMD_FLAG_0_SHIFT
#define NAME_ID_COMPRESSION_SHIFT SceneMultiplayer::CMD_FLAG_2_SHIFT
#define BYTE_ONLY_OR_NO_ARGS_SHIFT SceneMultiplayer::CMD_FLAG_3_SHIFT
#define NODE_ID_COMPRESSION_FLAG ((1 << NODE_ID_COMPRESSION_SHIFT) | (1 << (NODE_ID_COMPRESSION_SHIFT + 1)))
#define NAME_ID_COMPRESSION_FLAG (1 << NAME_ID_COMPRESSION_SHIFT)
#define BYTE_ONLY_OR_NO_ARGS_FLAG (1 << BYTE_ONLY_OR_NO_ARGS_SHIFT)
#ifdef DEBUG_ENABLED
_FORCE_INLINE_ void SceneRPCInterface::_profile_node_data(const String &p_what, ObjectID p_id, int p_size) {
if (EngineDebugger::is_profiling("multiplayer:rpc")) {
Array values;
values.push_back(p_what);
values.push_back(p_id);
values.push_back(p_size);
EngineDebugger::profiler_add_frame_data("multiplayer:rpc", values);
}
}
#endif
// Returns the packet size stripping the node path added when the node is not yet cached.
int get_packet_len(uint32_t p_node_target, int p_packet_len) {
if (p_node_target & 0x80000000) {
int ofs = p_node_target & 0x7FFFFFFF;
return p_packet_len - (p_packet_len - ofs);
} else {
return p_packet_len;
}
}
void SceneRPCInterface::_parse_rpc_config(const Variant &p_config, bool p_for_node, RPCConfigCache &r_cache) {
if (p_config.get_type() == Variant::NIL) {
return;
}
ERR_FAIL_COND(p_config.get_type() != Variant::DICTIONARY);
const Dictionary config = p_config;
Array names = config.keys();
names.sort(); // Ensure ID order
for (int i = 0; i < names.size(); i++) {
ERR_CONTINUE(names[i].get_type() != Variant::STRING && names[i].get_type() != Variant::STRING_NAME);
String name = names[i].operator String();
ERR_CONTINUE(config[name].get_type() != Variant::DICTIONARY);
ERR_CONTINUE(!config[name].operator Dictionary().has("rpc_mode"));
Dictionary dict = config[name];
RPCConfig cfg;
cfg.name = name;
cfg.rpc_mode = ((MultiplayerAPI::RPCMode)dict.get("rpc_mode", MultiplayerAPI::RPC_MODE_AUTHORITY).operator int());
cfg.transfer_mode = ((MultiplayerPeer::TransferMode)dict.get("transfer_mode", MultiplayerPeer::TRANSFER_MODE_RELIABLE).operator int());
cfg.call_local = dict.get("call_local", false).operator bool();
cfg.channel = dict.get("channel", 0).operator int();
uint16_t id = ((uint16_t)i);
if (p_for_node) {
id |= (1 << 15);
}
r_cache.configs[id] = cfg;
r_cache.ids[name] = id;
}
}
const SceneRPCInterface::RPCConfigCache &SceneRPCInterface::_get_node_config(const Node *p_node) {
const ObjectID oid = p_node->get_instance_id();
if (rpc_cache.has(oid)) {
return rpc_cache[oid];
}
RPCConfigCache cache;
_parse_rpc_config(p_node->get_node_rpc_config(), true, cache);
if (p_node->get_script_instance()) {
_parse_rpc_config(p_node->get_script_instance()->get_rpc_config(), false, cache);
}
rpc_cache[oid] = cache;
return rpc_cache[oid];
}
_FORCE_INLINE_ bool _can_call_mode(Node *p_node, MultiplayerAPI::RPCMode mode, int p_remote_id) {
switch (mode) {
case MultiplayerAPI::RPC_MODE_DISABLED: {
return false;
} break;
case MultiplayerAPI::RPC_MODE_ANY_PEER: {
return true;
} break;
case MultiplayerAPI::RPC_MODE_AUTHORITY: {
return !p_node->is_multiplayer_authority() && p_remote_id == p_node->get_multiplayer_authority();
} break;
}
return false;
}
String SceneRPCInterface::get_rpc_md5(const Object *p_obj) {
const Node *node = Object::cast_to<Node>(p_obj);
ERR_FAIL_COND_V(!node, "");
const RPCConfigCache cache = _get_node_config(node);
String rpc_list;
for (const KeyValue<uint16_t, RPCConfig> &config : cache.configs) {
rpc_list += String(config.value.name);
}
return rpc_list.md5_text();
}
Node *SceneRPCInterface::_process_get_node(int p_from, const uint8_t *p_packet, uint32_t p_node_target, int p_packet_len) {
Node *root_node = SceneTree::get_singleton()->get_root()->get_node(multiplayer->get_root_path());
ERR_FAIL_COND_V(!root_node, nullptr);
Node *node = nullptr;
if (p_node_target & 0x80000000) {
// Use full path (not cached yet).
int ofs = p_node_target & 0x7FFFFFFF;
ERR_FAIL_COND_V_MSG(ofs >= p_packet_len, nullptr, "Invalid packet received. Size smaller than declared.");
String paths;
paths.parse_utf8((const char *)&p_packet[ofs], p_packet_len - ofs);
NodePath np = paths;
node = root_node->get_node(np);
if (!node) {
ERR_PRINT("Failed to get path from RPC: " + String(np) + ".");
}
return node;
} else {
// Use cached path.
return Object::cast_to<Node>(multiplayer->get_path_cache()->get_cached_object(p_from, p_node_target));
}
}
void SceneRPCInterface::process_rpc(int p_from, const uint8_t *p_packet, int p_packet_len) {
// Extract packet meta
int packet_min_size = 1;
int name_id_offset = 1;
ERR_FAIL_COND_MSG(p_packet_len < packet_min_size, "Invalid packet received. Size too small.");
// Compute the meta size, which depends on the compression level.
int node_id_compression = (p_packet[0] & NODE_ID_COMPRESSION_FLAG) >> NODE_ID_COMPRESSION_SHIFT;
int name_id_compression = (p_packet[0] & NAME_ID_COMPRESSION_FLAG) >> NAME_ID_COMPRESSION_SHIFT;
switch (node_id_compression) {
case NETWORK_NODE_ID_COMPRESSION_8:
packet_min_size += 1;
name_id_offset += 1;
break;
case NETWORK_NODE_ID_COMPRESSION_16:
packet_min_size += 2;
name_id_offset += 2;
break;
case NETWORK_NODE_ID_COMPRESSION_32:
packet_min_size += 4;
name_id_offset += 4;
break;
default:
ERR_FAIL_MSG("Was not possible to extract the node id compression mode.");
}
switch (name_id_compression) {
case NETWORK_NAME_ID_COMPRESSION_8:
packet_min_size += 1;
break;
case NETWORK_NAME_ID_COMPRESSION_16:
packet_min_size += 2;
break;
default:
ERR_FAIL_MSG("Was not possible to extract the name id compression mode.");
}
ERR_FAIL_COND_MSG(p_packet_len < packet_min_size, "Invalid packet received. Size too small.");
uint32_t node_target = 0;
switch (node_id_compression) {
case NETWORK_NODE_ID_COMPRESSION_8:
node_target = p_packet[1];
break;
case NETWORK_NODE_ID_COMPRESSION_16:
node_target = decode_uint16(p_packet + 1);
break;
case NETWORK_NODE_ID_COMPRESSION_32:
node_target = decode_uint32(p_packet + 1);
break;
default:
// Unreachable, checked before.
CRASH_NOW();
}
Node *node = _process_get_node(p_from, p_packet, node_target, p_packet_len);
ERR_FAIL_COND_MSG(node == nullptr, "Invalid packet received. Requested node was not found.");
uint16_t name_id = 0;
switch (name_id_compression) {
case NETWORK_NAME_ID_COMPRESSION_8:
name_id = p_packet[name_id_offset];
break;
case NETWORK_NAME_ID_COMPRESSION_16:
name_id = decode_uint16(p_packet + name_id_offset);
break;
default:
// Unreachable, checked before.
CRASH_NOW();
}
const int packet_len = get_packet_len(node_target, p_packet_len);
_process_rpc(node, name_id, p_from, p_packet, packet_len, packet_min_size);
}
void SceneRPCInterface::_process_rpc(Node *p_node, const uint16_t p_rpc_method_id, int p_from, const uint8_t *p_packet, int p_packet_len, int p_offset) {
ERR_FAIL_COND_MSG(p_offset > p_packet_len, "Invalid packet received. Size too small.");
// Check that remote can call the RPC on this node.
const RPCConfigCache &cache_config = _get_node_config(p_node);
ERR_FAIL_COND(!cache_config.configs.has(p_rpc_method_id));
const RPCConfig &config = cache_config.configs[p_rpc_method_id];
bool can_call = _can_call_mode(p_node, config.rpc_mode, p_from);
ERR_FAIL_COND_MSG(!can_call, "RPC '" + String(config.name) + "' is not allowed on node " + p_node->get_path() + " from: " + itos(p_from) + ". Mode is " + itos((int)config.rpc_mode) + ", authority is " + itos(p_node->get_multiplayer_authority()) + ".");
int argc = 0;
const bool byte_only_or_no_args = p_packet[0] & BYTE_ONLY_OR_NO_ARGS_FLAG;
if (byte_only_or_no_args) {
if (p_offset < p_packet_len) {
// This packet contains only bytes.
argc = 1;
}
} else {
// Normal variant, takes the argument count from the packet.
ERR_FAIL_COND_MSG(p_offset >= p_packet_len, "Invalid packet received. Size too small.");
argc = p_packet[p_offset];
p_offset += 1;
}
Vector<Variant> args;
Vector<const Variant *> argp;
args.resize(argc);
argp.resize(argc);
#ifdef DEBUG_ENABLED
_profile_node_data("rpc_in", p_node->get_instance_id(), p_packet_len);
#endif
int out;
MultiplayerAPI::decode_and_decompress_variants(args, &p_packet[p_offset], p_packet_len - p_offset, out, byte_only_or_no_args, multiplayer->is_object_decoding_allowed());
for (int i = 0; i < argc; i++) {
argp.write[i] = &args[i];
}
Callable::CallError ce;
p_node->callp(config.name, (const Variant **)argp.ptr(), argc, ce);
if (ce.error != Callable::CallError::CALL_OK) {
String error = Variant::get_call_error_text(p_node, config.name, (const Variant **)argp.ptr(), argc, ce);
error = "RPC - " + error;
ERR_PRINT(error);
}
}
void SceneRPCInterface::_send_rpc(Node *p_node, int p_to, uint16_t p_rpc_id, const RPCConfig &p_config, const StringName &p_name, const Variant **p_arg, int p_argcount) {
Ref<MultiplayerPeer> peer = multiplayer->get_multiplayer_peer();
ERR_FAIL_COND_MSG(peer.is_null(), "Attempt to call RPC without active multiplayer peer.");
ERR_FAIL_COND_MSG(peer->get_connection_status() == MultiplayerPeer::CONNECTION_CONNECTING, "Attempt to call RPC while multiplayer peer is not connected yet.");
ERR_FAIL_COND_MSG(peer->get_connection_status() == MultiplayerPeer::CONNECTION_DISCONNECTED, "Attempt to call RPC while multiplayer peer is disconnected.");
ERR_FAIL_COND_MSG(p_argcount > 255, "Too many arguments (>255).");
if (p_to != 0 && !multiplayer->get_connected_peers().has(ABS(p_to))) {
ERR_FAIL_COND_MSG(p_to == multiplayer->get_unique_id(), "Attempt to call RPC on yourself! Peer unique ID: " + itos(multiplayer->get_unique_id()) + ".");
ERR_FAIL_MSG("Attempt to call RPC with unknown peer ID: " + itos(p_to) + ".");
}
// See if all peers have cached path (if so, call can be fast) while building the RPC target list.
HashSet<int> targets;
Ref<SceneCacheInterface> cache = multiplayer->get_path_cache();
int psc_id = -1;
bool has_all_peers = true;
const ObjectID oid = p_node->get_instance_id();
if (p_to > 0) {
ERR_FAIL_COND_MSG(!multiplayer->get_replicator()->is_rpc_visible(oid, p_to), "Attempt to call an RPC to a peer that cannot see this node. Peer ID: " + itos(p_to));
targets.insert(p_to);
has_all_peers = cache->send_object_cache(p_node, p_to, psc_id);
} else {
bool restricted = !multiplayer->get_replicator()->is_rpc_visible(oid, 0);
for (const int &P : multiplayer->get_connected_peers()) {
if (p_to < 0 && P == -p_to) {
continue; // Excluded peer.
}
if (restricted && !multiplayer->get_replicator()->is_rpc_visible(oid, P)) {
continue; // Not visible to this peer.
}
targets.insert(P);
bool has_peer = cache->send_object_cache(p_node, P, psc_id);
has_all_peers = has_all_peers && has_peer;
}
}
if (targets.is_empty()) {
return; // No one in sight.
}
// Create base packet, lots of hardcode because it must be tight.
int ofs = 0;
#define MAKE_ROOM(m_amount) \
if (packet_cache.size() < m_amount) \
packet_cache.resize(m_amount);
// Encode meta.
uint8_t command_type = SceneMultiplayer::NETWORK_COMMAND_REMOTE_CALL;
uint8_t node_id_compression = UINT8_MAX;
uint8_t name_id_compression = UINT8_MAX;
bool byte_only_or_no_args = false;
MAKE_ROOM(1);
// The meta is composed along the way, so just set 0 for now.
packet_cache.write[0] = 0;
ofs += 1;
// Encode Node ID.
if (has_all_peers) {
// Compress the node ID only if all the target peers already know it.
if (psc_id >= 0 && psc_id <= 255) {
// We can encode the id in 1 byte
node_id_compression = NETWORK_NODE_ID_COMPRESSION_8;
MAKE_ROOM(ofs + 1);
packet_cache.write[ofs] = static_cast<uint8_t>(psc_id);
ofs += 1;
} else if (psc_id >= 0 && psc_id <= 65535) {
// We can encode the id in 2 bytes
node_id_compression = NETWORK_NODE_ID_COMPRESSION_16;
MAKE_ROOM(ofs + 2);
encode_uint16(static_cast<uint16_t>(psc_id), &(packet_cache.write[ofs]));
ofs += 2;
} else {
// Too big, let's use 4 bytes.
node_id_compression = NETWORK_NODE_ID_COMPRESSION_32;
MAKE_ROOM(ofs + 4);
encode_uint32(psc_id, &(packet_cache.write[ofs]));
ofs += 4;
}
} else {
// The targets don't know the node yet, so we need to use 32 bits int.
node_id_compression = NETWORK_NODE_ID_COMPRESSION_32;
MAKE_ROOM(ofs + 4);
encode_uint32(psc_id, &(packet_cache.write[ofs]));
ofs += 4;
}
// Encode method ID
if (p_rpc_id <= UINT8_MAX) {
// The ID fits in 1 byte
name_id_compression = NETWORK_NAME_ID_COMPRESSION_8;
MAKE_ROOM(ofs + 1);
packet_cache.write[ofs] = static_cast<uint8_t>(p_rpc_id);
ofs += 1;
} else {
// The ID is larger, let's use 2 bytes
name_id_compression = NETWORK_NAME_ID_COMPRESSION_16;
MAKE_ROOM(ofs + 2);
encode_uint16(p_rpc_id, &(packet_cache.write[ofs]));
ofs += 2;
}
int len;
Error err = MultiplayerAPI::encode_and_compress_variants(p_arg, p_argcount, nullptr, len, &byte_only_or_no_args, multiplayer->is_object_decoding_allowed());
ERR_FAIL_COND_MSG(err != OK, "Unable to encode RPC arguments. THIS IS LIKELY A BUG IN THE ENGINE!");
if (byte_only_or_no_args) {
MAKE_ROOM(ofs + len);
} else {
MAKE_ROOM(ofs + 1 + len);
packet_cache.write[ofs] = p_argcount;
ofs += 1;
}
if (len) {
MultiplayerAPI::encode_and_compress_variants(p_arg, p_argcount, &packet_cache.write[ofs], len, &byte_only_or_no_args, multiplayer->is_object_decoding_allowed());
ofs += len;
}
ERR_FAIL_COND(command_type > 7);
ERR_FAIL_COND(node_id_compression > 3);
ERR_FAIL_COND(name_id_compression > 1);
#ifdef DEBUG_ENABLED
_profile_node_data("rpc_out", p_node->get_instance_id(), ofs);
#endif
// We can now set the meta
packet_cache.write[0] = command_type + (node_id_compression << NODE_ID_COMPRESSION_SHIFT) + (name_id_compression << NAME_ID_COMPRESSION_SHIFT) + (byte_only_or_no_args ? BYTE_ONLY_OR_NO_ARGS_FLAG : 0);
// Take chance and set transfer mode, since all send methods will use it.
peer->set_transfer_channel(p_config.channel);
peer->set_transfer_mode(p_config.transfer_mode);
if (has_all_peers) {
for (const int P : targets) {
multiplayer->send_command(P, packet_cache.ptr(), ofs);
}
} else {
// Unreachable because the node ID is never compressed if the peers doesn't know it.
CRASH_COND(node_id_compression != NETWORK_NODE_ID_COMPRESSION_32);
// Not all verified path, so send one by one.
// Append path at the end, since we will need it for some packets.
NodePath from_path = multiplayer->get_root_path().rel_path_to(p_node->get_path());
CharString pname = String(from_path).utf8();
int path_len = encode_cstring(pname.get_data(), nullptr);
MAKE_ROOM(ofs + path_len);
encode_cstring(pname.get_data(), &(packet_cache.write[ofs]));
// Not all verified path, so check which needs the longer packet.
for (const int P : targets) {
bool confirmed = multiplayer->get_path_cache()->is_cache_confirmed(from_path, P);
if (confirmed) {
// This one confirmed path, so use id.
encode_uint32(psc_id, &(packet_cache.write[1]));
multiplayer->send_command(P, packet_cache.ptr(), ofs);
} else {
// This one did not confirm path yet, so use entire path (sorry!).
encode_uint32(0x80000000 | ofs, &(packet_cache.write[1])); // Offset to path and flag.
multiplayer->send_command(P, packet_cache.ptr(), ofs + path_len);
}
}
}
}
Error SceneRPCInterface::rpcp(Object *p_obj, int p_peer_id, const StringName &p_method, const Variant **p_arg, int p_argcount) {
Ref<MultiplayerPeer> peer = multiplayer->get_multiplayer_peer();
ERR_FAIL_COND_V_MSG(!peer.is_valid(), ERR_UNCONFIGURED, "Trying to call an RPC while no multiplayer peer is active.");
Node *node = Object::cast_to<Node>(p_obj);
ERR_FAIL_COND_V_MSG(!node || !node->is_inside_tree(), ERR_INVALID_PARAMETER, "The object must be a valid Node inside the SceneTree");
ERR_FAIL_COND_V_MSG(peer->get_connection_status() != MultiplayerPeer::CONNECTION_CONNECTED, ERR_CONNECTION_ERROR, "Trying to call an RPC via a multiplayer peer which is not connected.");
int caller_id = multiplayer->get_unique_id();
bool call_local_native = false;
bool call_local_script = false;
const RPCConfigCache &config_cache = _get_node_config(node);
uint16_t rpc_id = config_cache.ids.has(p_method) ? config_cache.ids[p_method] : UINT16_MAX;
ERR_FAIL_COND_V_MSG(rpc_id == UINT16_MAX, ERR_INVALID_PARAMETER,
vformat("Unable to get the RPC configuration for the function \"%s\" at path: \"%s\". This happens when the method is missing or not marked for RPCs in the local script.", p_method, node->get_path()));
const RPCConfig &config = config_cache.configs[rpc_id];
ERR_FAIL_COND_V_MSG(p_peer_id == caller_id && !config.call_local, ERR_INVALID_PARAMETER, "RPC '" + p_method + "' on yourself is not allowed by selected mode.");
if (p_peer_id == 0 || p_peer_id == caller_id || (p_peer_id < 0 && p_peer_id != -caller_id)) {
if (rpc_id & (1 << 15)) {
call_local_native = config.call_local;
} else {
call_local_script = config.call_local;
}
}
if (p_peer_id != caller_id) {
_send_rpc(node, p_peer_id, rpc_id, config, p_method, p_arg, p_argcount);
}
if (call_local_native) {
Callable::CallError ce;
multiplayer->set_remote_sender_override(multiplayer->get_unique_id());
node->callp(p_method, p_arg, p_argcount, ce);
multiplayer->set_remote_sender_override(0);
if (ce.error != Callable::CallError::CALL_OK) {
String error = Variant::get_call_error_text(node, p_method, p_arg, p_argcount, ce);
error = "rpc() aborted in local call: - " + error + ".";
ERR_PRINT(error);
return FAILED;
}
}
if (call_local_script) {
Callable::CallError ce;
ce.error = Callable::CallError::CALL_OK;
multiplayer->set_remote_sender_override(multiplayer->get_unique_id());
node->get_script_instance()->callp(p_method, p_arg, p_argcount, ce);
multiplayer->set_remote_sender_override(0);
if (ce.error != Callable::CallError::CALL_OK) {
String error = Variant::get_call_error_text(node, p_method, p_arg, p_argcount, ce);
error = "rpc() aborted in script local call: - " + error + ".";
ERR_PRINT(error);
return FAILED;
}
}
return OK;
}
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