Merge pull request #52442 from Faless/mp/4.x_rpc_manager

[Net] Move multiplayer classes to own subfolder. Split RPC from MultiplayerAPI.

1 files changed, 668 insertions, 0 deletions

diff --git a/core/multiplayer/multiplayer_api.cpp b/core/multiplayer/multiplayer_api.cpp
new file mode 100644
index 0000000000..1130fcf9cb
--- /dev/null
+++ b/core/multiplayer/multiplayer_api.cpp
@@ -0,0 +1,668 @@
+/*************************************************************************/
+/*  multiplayer_api.cpp                                                  */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2021 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 "multiplayer_api.h"
+
+#include "core/debugger/engine_debugger.h"
+#include "core/io/marshalls.h"
+#include "core/multiplayer/multiplayer_replicator.h"
+#include "core/multiplayer/rpc_manager.h"
+#include "scene/main/node.h"
+
+#include <stdint.h>
+
+#ifdef DEBUG_ENABLED
+#include "core/os/os.h"
+#endif
+
+#ifdef DEBUG_ENABLED
+void MultiplayerAPI::profile_bandwidth(const String &p_inout, int p_size) {
+	if (EngineDebugger::is_profiling("multiplayer")) {
+		Array values;
+		values.push_back("bandwidth");
+		values.push_back(p_inout);
+		values.push_back(OS::get_singleton()->get_ticks_msec());
+		values.push_back(p_size);
+		EngineDebugger::profiler_add_frame_data("multiplayer", values);
+	}
+}
+#endif
+
+void MultiplayerAPI::poll() {
+	if (!network_peer.is_valid() || network_peer->get_connection_status() == MultiplayerPeer::CONNECTION_DISCONNECTED) {
+		return;
+	}
+
+	network_peer->poll();
+
+	if (!network_peer.is_valid()) { // It's possible that polling might have resulted in a disconnection, so check here.
+		return;
+	}
+
+	while (network_peer->get_available_packet_count()) {
+		int sender = network_peer->get_packet_peer();
+		const uint8_t *packet;
+		int len;
+
+		Error err = network_peer->get_packet(&packet, len);
+		if (err != OK) {
+			ERR_PRINT("Error getting packet!");
+			break; // Something is wrong!
+		}
+
+		remote_sender_id = sender;
+		_process_packet(sender, packet, len);
+		remote_sender_id = 0;
+
+		if (!network_peer.is_valid()) {
+			break; // It's also possible that a packet or RPC caused a disconnection, so also check here.
+		}
+	}
+	if (network_peer.is_valid() && network_peer->get_connection_status() == MultiplayerPeer::CONNECTION_CONNECTED) {
+		replicator->poll();
+	}
+}
+
+void MultiplayerAPI::clear() {
+	replicator->clear();
+	connected_peers.clear();
+	path_get_cache.clear();
+	path_send_cache.clear();
+	packet_cache.clear();
+	last_send_cache_id = 1;
+}
+
+void MultiplayerAPI::set_root_node(Node *p_node) {
+	root_node = p_node;
+}
+
+Node *MultiplayerAPI::get_root_node() {
+	return root_node;
+}
+
+void MultiplayerAPI::set_network_peer(const Ref<MultiplayerPeer> &p_peer) {
+	if (p_peer == network_peer) {
+		return; // Nothing to do
+	}
+
+	ERR_FAIL_COND_MSG(p_peer.is_valid() && p_peer->get_connection_status() == MultiplayerPeer::CONNECTION_DISCONNECTED,
+			"Supplied MultiplayerPeer must be connecting or connected.");
+
+	if (network_peer.is_valid()) {
+		network_peer->disconnect("peer_connected", callable_mp(this, &MultiplayerAPI::_add_peer));
+		network_peer->disconnect("peer_disconnected", callable_mp(this, &MultiplayerAPI::_del_peer));
+		network_peer->disconnect("connection_succeeded", callable_mp(this, &MultiplayerAPI::_connected_to_server));
+		network_peer->disconnect("connection_failed", callable_mp(this, &MultiplayerAPI::_connection_failed));
+		network_peer->disconnect("server_disconnected", callable_mp(this, &MultiplayerAPI::_server_disconnected));
+		clear();
+	}
+
+	network_peer = p_peer;
+
+	if (network_peer.is_valid()) {
+		network_peer->connect("peer_connected", callable_mp(this, &MultiplayerAPI::_add_peer));
+		network_peer->connect("peer_disconnected", callable_mp(this, &MultiplayerAPI::_del_peer));
+		network_peer->connect("connection_succeeded", callable_mp(this, &MultiplayerAPI::_connected_to_server));
+		network_peer->connect("connection_failed", callable_mp(this, &MultiplayerAPI::_connection_failed));
+		network_peer->connect("server_disconnected", callable_mp(this, &MultiplayerAPI::_server_disconnected));
+	}
+}
+
+Ref<MultiplayerPeer> MultiplayerAPI::get_network_peer() const {
+	return network_peer;
+}
+
+void MultiplayerAPI::_process_packet(int p_from, const uint8_t *p_packet, int p_packet_len) {
+	ERR_FAIL_COND_MSG(root_node == nullptr, "Multiplayer root node was not initialized. If you are using custom multiplayer, remember to set the root node via MultiplayerAPI.set_root_node before using it.");
+	ERR_FAIL_COND_MSG(p_packet_len < 1, "Invalid packet received. Size too small.");
+
+#ifdef DEBUG_ENABLED
+	profile_bandwidth("in", p_packet_len);
+#endif
+
+	// Extract the `packet_type` from the LSB three bits:
+	uint8_t packet_type = p_packet[0] & CMD_MASK;
+
+	switch (packet_type) {
+		case NETWORK_COMMAND_SIMPLIFY_PATH: {
+			_process_simplify_path(p_from, p_packet, p_packet_len);
+		} break;
+
+		case NETWORK_COMMAND_CONFIRM_PATH: {
+			_process_confirm_path(p_from, p_packet, p_packet_len);
+		} break;
+
+		case NETWORK_COMMAND_REMOTE_CALL: {
+			rpc_manager->process_rpc(p_from, p_packet, p_packet_len);
+		} break;
+
+		case NETWORK_COMMAND_RAW: {
+			_process_raw(p_from, p_packet, p_packet_len);
+		} break;
+		case NETWORK_COMMAND_SPAWN: {
+			replicator->process_spawn_despawn(p_from, p_packet, p_packet_len, true);
+		} break;
+		case NETWORK_COMMAND_DESPAWN: {
+			replicator->process_spawn_despawn(p_from, p_packet, p_packet_len, false);
+		} break;
+		case NETWORK_COMMAND_SYNC: {
+			replicator->process_sync(p_from, p_packet, p_packet_len);
+		} break;
+	}
+}
+
+void MultiplayerAPI::_process_simplify_path(int p_from, const uint8_t *p_packet, int p_packet_len) {
+	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 = rpc_manager->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] = NETWORK_COMMAND_CONFIRM_PATH;
+	packet.write[1] = valid_rpc_checksum;
+	encode_cstring(pname.get_data(), &packet.write[2]);
+
+	network_peer->set_transfer_channel(0);
+	network_peer->set_transfer_mode(Multiplayer::TRANSFER_MODE_RELIABLE);
+	network_peer->set_target_peer(p_from);
+	network_peer->put_packet(packet.ptr(), packet.size());
+}
+
+void MultiplayerAPI::_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.");
+
+	Map<int, bool>::Element *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->get() = true;
+}
+
+bool MultiplayerAPI::_send_confirm_path(Node *p_node, NodePath p_path, PathSentCache *psc, int p_target) {
+	bool has_all_peers = true;
+	List<int> peers_to_add; // If one is missing, take note to add it.
+
+	for (Set<int>::Element *E = connected_peers.front(); E; E = E->next()) {
+		if (p_target < 0 && E->get() == -p_target) {
+			continue; // Continue, excluded.
+		}
+
+		if (p_target > 0 && E->get() != p_target) {
+			continue; // Continue, not for this peer.
+		}
+
+		Map<int, bool>::Element *F = psc->confirmed_peers.find(E->get());
+
+		if (!F || !F->get()) {
+			// Path was not cached, or was cached but is unconfirmed.
+			if (!F) {
+				// Not cached at all, take note.
+				peers_to_add.push_back(E->get());
+			}
+
+			has_all_peers = false;
+		}
+	}
+
+	if (peers_to_add.size() > 0) {
+		// Those that need to be added, send a message for this.
+
+		// 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 = rpc_manager->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] = 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]);
+
+		for (int &E : peers_to_add) {
+			network_peer->set_target_peer(E); // To all of you.
+			network_peer->set_transfer_channel(0);
+			network_peer->set_transfer_mode(Multiplayer::TRANSFER_MODE_RELIABLE);
+			network_peer->put_packet(packet.ptr(), packet.size());
+
+			psc->confirmed_peers.insert(E, false); // Insert into confirmed, but as false since it was not confirmed.
+		}
+	}
+
+	return has_all_peers;
+}
+
+// The variant is compressed and encoded; The first byte contains all the meta
+// information and the format is:
+// - The first LSB 5 bits are used for the variant type.
+// - The next two bits are used to store the encoding mode.
+// - The most significant is used to store the boolean value.
+#define VARIANT_META_TYPE_MASK 0x1F
+#define VARIANT_META_EMODE_MASK 0x60
+#define VARIANT_META_BOOL_MASK 0x80
+#define ENCODE_8 0 << 5
+#define ENCODE_16 1 << 5
+#define ENCODE_32 2 << 5
+#define ENCODE_64 3 << 5
+Error MultiplayerAPI::encode_and_compress_variant(const Variant &p_variant, uint8_t *r_buffer, int &r_len) {
+	// Unreachable because `VARIANT_MAX` == 27 and `ENCODE_VARIANT_MASK` == 31
+	CRASH_COND(p_variant.get_type() > VARIANT_META_TYPE_MASK);
+
+	uint8_t *buf = r_buffer;
+	r_len = 0;
+	uint8_t encode_mode = 0;
+
+	switch (p_variant.get_type()) {
+		case Variant::BOOL: {
+			if (buf) {
+				// We still have 1 free bit in the meta, so let's use it.
+				buf[0] = (p_variant.operator bool()) ? (1 << 7) : 0;
+				buf[0] |= encode_mode | p_variant.get_type();
+			}
+			r_len += 1;
+		} break;
+		case Variant::INT: {
+			if (buf) {
+				// Reserve the first byte for the meta.
+				buf += 1;
+			}
+			r_len += 1;
+			int64_t val = p_variant;
+			if (val <= (int64_t)INT8_MAX && val >= (int64_t)INT8_MIN) {
+				// Use 8 bit
+				encode_mode = ENCODE_8;
+				if (buf) {
+					buf[0] = val;
+				}
+				r_len += 1;
+			} else if (val <= (int64_t)INT16_MAX && val >= (int64_t)INT16_MIN) {
+				// Use 16 bit
+				encode_mode = ENCODE_16;
+				if (buf) {
+					encode_uint16(val, buf);
+				}
+				r_len += 2;
+			} else if (val <= (int64_t)INT32_MAX && val >= (int64_t)INT32_MIN) {
+				// Use 32 bit
+				encode_mode = ENCODE_32;
+				if (buf) {
+					encode_uint32(val, buf);
+				}
+				r_len += 4;
+			} else {
+				// Use 64 bit
+				encode_mode = ENCODE_64;
+				if (buf) {
+					encode_uint64(val, buf);
+				}
+				r_len += 8;
+			}
+			// Store the meta
+			if (buf) {
+				buf -= 1;
+				buf[0] = encode_mode | p_variant.get_type();
+			}
+		} break;
+		default:
+			// Any other case is not yet compressed.
+			Error err = encode_variant(p_variant, r_buffer, r_len, allow_object_decoding);
+			if (err != OK) {
+				return err;
+			}
+			if (r_buffer) {
+				// The first byte is not used by the marshalling, so store the type
+				// so we know how to decompress and decode this variant.
+				r_buffer[0] = p_variant.get_type();
+			}
+	}
+
+	return OK;
+}
+
+Error MultiplayerAPI::decode_and_decompress_variant(Variant &r_variant, const uint8_t *p_buffer, int p_len, int *r_len) {
+	const uint8_t *buf = p_buffer;
+	int len = p_len;
+
+	ERR_FAIL_COND_V(len < 1, ERR_INVALID_DATA);
+	uint8_t type = buf[0] & VARIANT_META_TYPE_MASK;
+	uint8_t encode_mode = buf[0] & VARIANT_META_EMODE_MASK;
+
+	ERR_FAIL_COND_V(type >= Variant::VARIANT_MAX, ERR_INVALID_DATA);
+
+	switch (type) {
+		case Variant::BOOL: {
+			bool val = (buf[0] & VARIANT_META_BOOL_MASK) > 0;
+			r_variant = val;
+			if (r_len) {
+				*r_len = 1;
+			}
+		} break;
+		case Variant::INT: {
+			buf += 1;
+			len -= 1;
+			if (r_len) {
+				*r_len = 1;
+			}
+			if (encode_mode == ENCODE_8) {
+				// 8 bits.
+				ERR_FAIL_COND_V(len < 1, ERR_INVALID_DATA);
+				int8_t val = buf[0];
+				r_variant = val;
+				if (r_len) {
+					(*r_len) += 1;
+				}
+			} else if (encode_mode == ENCODE_16) {
+				// 16 bits.
+				ERR_FAIL_COND_V(len < 2, ERR_INVALID_DATA);
+				int16_t val = decode_uint16(buf);
+				r_variant = val;
+				if (r_len) {
+					(*r_len) += 2;
+				}
+			} else if (encode_mode == ENCODE_32) {
+				// 32 bits.
+				ERR_FAIL_COND_V(len < 4, ERR_INVALID_DATA);
+				int32_t val = decode_uint32(buf);
+				r_variant = val;
+				if (r_len) {
+					(*r_len) += 4;
+				}
+			} else {
+				// 64 bits.
+				ERR_FAIL_COND_V(len < 8, ERR_INVALID_DATA);
+				int64_t val = decode_uint64(buf);
+				r_variant = val;
+				if (r_len) {
+					(*r_len) += 8;
+				}
+			}
+		} break;
+		default:
+			Error err = decode_variant(r_variant, p_buffer, p_len, r_len, allow_object_decoding);
+			if (err != OK) {
+				return err;
+			}
+	}
+
+	return OK;
+}
+
+void MultiplayerAPI::_add_peer(int p_id) {
+	connected_peers.insert(p_id);
+	path_get_cache.insert(p_id, PathGetCache());
+	if (is_network_server()) {
+		replicator->spawn_all(p_id);
+	}
+	emit_signal(SNAME("network_peer_connected"), p_id);
+}
+
+void MultiplayerAPI::_del_peer(int p_id) {
+	connected_peers.erase(p_id);
+	// Cleanup get cache.
+	path_get_cache.erase(p_id);
+	// Cleanup sent cache.
+	// Some refactoring is needed to make this faster and do paths GC.
+	List<NodePath> keys;
+	path_send_cache.get_key_list(&keys);
+	for (const NodePath &E : keys) {
+		PathSentCache *psc = path_send_cache.getptr(E);
+		psc->confirmed_peers.erase(p_id);
+	}
+	emit_signal(SNAME("network_peer_disconnected"), p_id);
+}
+
+void MultiplayerAPI::_connected_to_server() {
+	emit_signal(SNAME("connected_to_server"));
+}
+
+void MultiplayerAPI::_connection_failed() {
+	emit_signal(SNAME("connection_failed"));
+}
+
+void MultiplayerAPI::_server_disconnected() {
+	emit_signal(SNAME("server_disconnected"));
+}
+
+Error MultiplayerAPI::send_bytes(Vector<uint8_t> p_data, int p_to, Multiplayer::TransferMode p_mode, int p_channel) {
+	ERR_FAIL_COND_V_MSG(p_data.size() < 1, ERR_INVALID_DATA, "Trying to send an empty raw packet.");
+	ERR_FAIL_COND_V_MSG(!network_peer.is_valid(), ERR_UNCONFIGURED, "Trying to send a raw packet while no network peer is active.");
+	ERR_FAIL_COND_V_MSG(network_peer->get_connection_status() != MultiplayerPeer::CONNECTION_CONNECTED, ERR_UNCONFIGURED, "Trying to send a raw packet via a network peer which is not connected.");
+
+	if (packet_cache.size() < p_data.size() + 1) {
+		packet_cache.resize(p_data.size() + 1);
+	}
+
+	const uint8_t *r = p_data.ptr();
+	packet_cache.write[0] = NETWORK_COMMAND_RAW;
+	memcpy(&packet_cache.write[1], &r[0], p_data.size());
+
+	network_peer->set_target_peer(p_to);
+	network_peer->set_transfer_channel(p_channel);
+	network_peer->set_transfer_mode(p_mode);
+
+	return network_peer->put_packet(packet_cache.ptr(), p_data.size() + 1);
+}
+
+void MultiplayerAPI::_process_raw(int p_from, const uint8_t *p_packet, int p_packet_len) {
+	ERR_FAIL_COND_MSG(p_packet_len < 2, "Invalid packet received. Size too small.");
+
+	Vector<uint8_t> out;
+	int len = p_packet_len - 1;
+	out.resize(len);
+	{
+		uint8_t *w = out.ptrw();
+		memcpy(&w[0], &p_packet[1], len);
+	}
+	emit_signal(SNAME("network_peer_packet"), p_from, out);
+}
+
+bool MultiplayerAPI::is_cache_confirmed(NodePath p_path, int p_peer) {
+	const PathSentCache *psc = path_send_cache.getptr(p_path);
+	ERR_FAIL_COND_V(!psc, false);
+	const Map<int, bool>::Element *F = psc->confirmed_peers.find(p_peer);
+	ERR_FAIL_COND_V(!F, false); // Should never happen.
+	return F->get();
+}
+
+bool MultiplayerAPI::send_confirm_path(Node *p_node, NodePath p_path, int p_peer_id, int &r_id) {
+	// See if the path is cached.
+	PathSentCache *psc = path_send_cache.getptr(p_path);
+	if (!psc) {
+		// Path is not cached, create.
+		path_send_cache[p_path] = PathSentCache();
+		psc = path_send_cache.getptr(p_path);
+		psc->id = last_send_cache_id++;
+	}
+	r_id = psc->id;
+
+	// See if all peers have cached path (if so, call can be fast).
+	return _send_confirm_path(p_node, p_path, psc, p_peer_id);
+}
+
+Node *MultiplayerAPI::get_cached_node(int p_from, uint32_t p_node_id) {
+	Map<int, PathGetCache>::Element *E = path_get_cache.find(p_from);
+	ERR_FAIL_COND_V_MSG(!E, nullptr, vformat("No cache found for peer %d.", p_from));
+
+	Map<int, PathGetCache::NodeInfo>::Element *F = E->get().nodes.find(p_node_id);
+	ERR_FAIL_COND_V_MSG(!F, nullptr, vformat("ID %d not found in cache of peer %d.", p_node_id, p_from));
+
+	PathGetCache::NodeInfo *ni = &F->get();
+	Node *node = root_node->get_node(ni->path);
+	if (!node) {
+		ERR_PRINT("Failed to get cached path: " + String(ni->path) + ".");
+	}
+	return node;
+}
+
+int MultiplayerAPI::get_network_unique_id() const {
+	ERR_FAIL_COND_V_MSG(!network_peer.is_valid(), 0, "No network peer is assigned. Unable to get unique network ID.");
+	return network_peer->get_unique_id();
+}
+
+bool MultiplayerAPI::is_network_server() const {
+	return network_peer.is_valid() && network_peer->is_server();
+}
+
+void MultiplayerAPI::set_refuse_new_network_connections(bool p_refuse) {
+	ERR_FAIL_COND_MSG(!network_peer.is_valid(), "No network peer is assigned. Unable to set 'refuse_new_connections'.");
+	network_peer->set_refuse_new_connections(p_refuse);
+}
+
+bool MultiplayerAPI::is_refusing_new_network_connections() const {
+	ERR_FAIL_COND_V_MSG(!network_peer.is_valid(), false, "No network peer is assigned. Unable to get 'refuse_new_connections'.");
+	return network_peer->is_refusing_new_connections();
+}
+
+Vector<int> MultiplayerAPI::get_network_connected_peers() const {
+	ERR_FAIL_COND_V_MSG(!network_peer.is_valid(), Vector<int>(), "No network peer is assigned. Assume no peers are connected.");
+
+	Vector<int> ret;
+	for (Set<int>::Element *E = connected_peers.front(); E; E = E->next()) {
+		ret.push_back(E->get());
+	}
+
+	return ret;
+}
+
+void MultiplayerAPI::set_allow_object_decoding(bool p_enable) {
+	allow_object_decoding = p_enable;
+}
+
+bool MultiplayerAPI::is_object_decoding_allowed() const {
+	return allow_object_decoding;
+}
+
+void MultiplayerAPI::scene_enter_exit_notify(const String &p_scene, Node *p_node, bool p_enter) {
+	replicator->scene_enter_exit_notify(p_scene, p_node, p_enter);
+}
+
+void MultiplayerAPI::rpcp(Node *p_node, int p_peer_id, const StringName &p_method, const Variant **p_arg, int p_argcount) {
+	rpc_manager->rpcp(p_node, p_peer_id, p_method, p_arg, p_argcount);
+}
+
+void MultiplayerAPI::_bind_methods() {
+	ClassDB::bind_method(D_METHOD("set_root_node", "node"), &MultiplayerAPI::set_root_node);
+	ClassDB::bind_method(D_METHOD("get_root_node"), &MultiplayerAPI::get_root_node);
+	ClassDB::bind_method(D_METHOD("send_bytes", "bytes", "id", "mode", "channel"), &MultiplayerAPI::send_bytes, DEFVAL(MultiplayerPeer::TARGET_PEER_BROADCAST), DEFVAL(Multiplayer::TRANSFER_MODE_RELIABLE), DEFVAL(0));
+	ClassDB::bind_method(D_METHOD("has_network_peer"), &MultiplayerAPI::has_network_peer);
+	ClassDB::bind_method(D_METHOD("get_network_peer"), &MultiplayerAPI::get_network_peer);
+	ClassDB::bind_method(D_METHOD("get_network_unique_id"), &MultiplayerAPI::get_network_unique_id);
+	ClassDB::bind_method(D_METHOD("is_network_server"), &MultiplayerAPI::is_network_server);
+	ClassDB::bind_method(D_METHOD("get_remote_sender_id"), &MultiplayerAPI::get_remote_sender_id);
+	ClassDB::bind_method(D_METHOD("set_network_peer", "peer"), &MultiplayerAPI::set_network_peer);
+	ClassDB::bind_method(D_METHOD("poll"), &MultiplayerAPI::poll);
+	ClassDB::bind_method(D_METHOD("clear"), &MultiplayerAPI::clear);
+
+	ClassDB::bind_method(D_METHOD("get_network_connected_peers"), &MultiplayerAPI::get_network_connected_peers);
+	ClassDB::bind_method(D_METHOD("set_refuse_new_network_connections", "refuse"), &MultiplayerAPI::set_refuse_new_network_connections);
+	ClassDB::bind_method(D_METHOD("is_refusing_new_network_connections"), &MultiplayerAPI::is_refusing_new_network_connections);
+	ClassDB::bind_method(D_METHOD("set_allow_object_decoding", "enable"), &MultiplayerAPI::set_allow_object_decoding);
+	ClassDB::bind_method(D_METHOD("is_object_decoding_allowed"), &MultiplayerAPI::is_object_decoding_allowed);
+	ClassDB::bind_method(D_METHOD("get_replicator"), &MultiplayerAPI::get_replicator);
+
+	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "allow_object_decoding"), "set_allow_object_decoding", "is_object_decoding_allowed");
+	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "refuse_new_network_connections"), "set_refuse_new_network_connections", "is_refusing_new_network_connections");
+	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "network_peer", PROPERTY_HINT_RESOURCE_TYPE, "MultiplayerPeer", PROPERTY_USAGE_NONE), "set_network_peer", "get_network_peer");
+	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "root_node", PROPERTY_HINT_RESOURCE_TYPE, "Node", PROPERTY_USAGE_NONE), "set_root_node", "get_root_node");
+	ADD_PROPERTY_DEFAULT("refuse_new_network_connections", false);
+	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "replicator", PROPERTY_HINT_RESOURCE_TYPE, "MultiplayerReplicator", PROPERTY_USAGE_NONE), "", "get_replicator");
+
+	ADD_SIGNAL(MethodInfo("network_peer_connected", PropertyInfo(Variant::INT, "id")));
+	ADD_SIGNAL(MethodInfo("network_peer_disconnected", PropertyInfo(Variant::INT, "id")));
+	ADD_SIGNAL(MethodInfo("network_peer_packet", PropertyInfo(Variant::INT, "id"), PropertyInfo(Variant::PACKED_BYTE_ARRAY, "packet")));
+	ADD_SIGNAL(MethodInfo("connected_to_server"));
+	ADD_SIGNAL(MethodInfo("connection_failed"));
+	ADD_SIGNAL(MethodInfo("server_disconnected"));
+}
+
+MultiplayerAPI::MultiplayerAPI() {
+	replicator = memnew(MultiplayerReplicator(this));
+	rpc_manager = memnew(RPCManager(this));
+	clear();
+}
+
+MultiplayerAPI::~MultiplayerAPI() {
+	clear();
+	memdelete(replicator);
+	memdelete(rpc_manager);
+}