415 lines
14 KiB
C++
415 lines
14 KiB
C++
/*************************************************************************/
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/* webrtc_multiplayer_peer.cpp */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#include "webrtc_multiplayer_peer.h"
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#include "core/io/marshalls.h"
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#include "core/os/os.h"
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void WebRTCMultiplayerPeer::_bind_methods() {
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ClassDB::bind_method(D_METHOD("initialize", "peer_id", "server_compatibility", "channels_config"), &WebRTCMultiplayerPeer::initialize, DEFVAL(false), DEFVAL(Array()));
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ClassDB::bind_method(D_METHOD("add_peer", "peer", "peer_id", "unreliable_lifetime"), &WebRTCMultiplayerPeer::add_peer, DEFVAL(1));
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ClassDB::bind_method(D_METHOD("remove_peer", "peer_id"), &WebRTCMultiplayerPeer::remove_peer);
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ClassDB::bind_method(D_METHOD("has_peer", "peer_id"), &WebRTCMultiplayerPeer::has_peer);
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ClassDB::bind_method(D_METHOD("get_peer", "peer_id"), &WebRTCMultiplayerPeer::get_peer);
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ClassDB::bind_method(D_METHOD("get_peers"), &WebRTCMultiplayerPeer::get_peers);
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ClassDB::bind_method(D_METHOD("close"), &WebRTCMultiplayerPeer::close);
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}
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void WebRTCMultiplayerPeer::set_target_peer(int p_peer_id) {
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target_peer = p_peer_id;
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}
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/* Returns the ID of the MultiplayerPeer who sent the most recent packet: */
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int WebRTCMultiplayerPeer::get_packet_peer() const {
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return next_packet_peer;
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}
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bool WebRTCMultiplayerPeer::is_server() const {
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return unique_id == TARGET_PEER_SERVER;
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}
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void WebRTCMultiplayerPeer::poll() {
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if (peer_map.size() == 0) {
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return;
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}
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List<int> remove;
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List<int> add;
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for (KeyValue<int, Ref<ConnectedPeer>> &E : peer_map) {
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Ref<ConnectedPeer> peer = E.value;
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peer->connection->poll();
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// Check peer state
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switch (peer->connection->get_connection_state()) {
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case WebRTCPeerConnection::STATE_NEW:
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case WebRTCPeerConnection::STATE_CONNECTING:
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// Go to next peer, not ready yet.
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continue;
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case WebRTCPeerConnection::STATE_CONNECTED:
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// Good to go, go ahead and check channel state.
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break;
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default:
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// Peer is closed or in error state. Got to next peer.
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remove.push_back(E.key);
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continue;
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}
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// Check channels state
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int ready = 0;
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for (List<Ref<WebRTCDataChannel>>::Element *C = peer->channels.front(); C && C->get().is_valid(); C = C->next()) {
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Ref<WebRTCDataChannel> ch = C->get();
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switch (ch->get_ready_state()) {
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case WebRTCDataChannel::STATE_CONNECTING:
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continue;
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case WebRTCDataChannel::STATE_OPEN:
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ready++;
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continue;
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default:
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// Channel was closed or in error state, remove peer id.
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remove.push_back(E.key);
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}
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// We got a closed channel break out, the peer will be removed.
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break;
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}
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// This peer has newly connected, and all channels are now open.
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if (ready == peer->channels.size() && !peer->connected) {
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peer->connected = true;
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add.push_back(E.key);
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}
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}
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// Remove disconnected peers
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for (int &E : remove) {
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remove_peer(E);
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if (next_packet_peer == E) {
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next_packet_peer = 0;
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}
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}
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// Signal newly connected peers
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for (int &E : add) {
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// Already connected to server: simply notify new peer.
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// NOTE: Mesh is always connected.
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if (connection_status == CONNECTION_CONNECTED) {
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emit_signal(SNAME("peer_connected"), E);
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}
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// Server emulation mode suppresses peer_conencted until server connects.
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if (server_compat && E == TARGET_PEER_SERVER) {
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// Server connected.
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connection_status = CONNECTION_CONNECTED;
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emit_signal(SNAME("peer_connected"), TARGET_PEER_SERVER);
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emit_signal(SNAME("connection_succeeded"));
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// Notify of all previously connected peers
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for (const KeyValue<int, Ref<ConnectedPeer>> &F : peer_map) {
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if (F.key != 1 && F.value->connected) {
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emit_signal(SNAME("peer_connected"), F.key);
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}
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}
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break; // Because we already notified of all newly added peers.
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}
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}
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// Fetch next packet
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if (next_packet_peer == 0) {
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_find_next_peer();
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}
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}
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void WebRTCMultiplayerPeer::_find_next_peer() {
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Map<int, Ref<ConnectedPeer>>::Element *E = peer_map.find(next_packet_peer);
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if (E) {
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E = E->next();
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}
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// After last.
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while (E) {
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if (!E->get()->connected) {
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E = E->next();
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continue;
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}
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for (const Ref<WebRTCDataChannel> &F : E->get()->channels) {
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if (F->get_available_packet_count()) {
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next_packet_peer = E->key();
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return;
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}
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}
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E = E->next();
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}
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E = peer_map.front();
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// Before last
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while (E) {
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if (!E->get()->connected) {
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E = E->next();
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continue;
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}
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for (const Ref<WebRTCDataChannel> &F : E->get()->channels) {
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if (F->get_available_packet_count()) {
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next_packet_peer = E->key();
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return;
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}
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}
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if (E->key() == (int)next_packet_peer) {
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break;
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}
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E = E->next();
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}
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// No packet found
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next_packet_peer = 0;
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}
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MultiplayerPeer::ConnectionStatus WebRTCMultiplayerPeer::get_connection_status() const {
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return connection_status;
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}
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Error WebRTCMultiplayerPeer::initialize(int p_self_id, bool p_server_compat, Array p_channels_config) {
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ERR_FAIL_COND_V(p_self_id < 1 || p_self_id > ~(1 << 31), ERR_INVALID_PARAMETER);
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channels_config.clear();
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for (int i = 0; i < p_channels_config.size(); i++) {
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ERR_FAIL_COND_V_MSG(p_channels_config[i].get_type() != Variant::INT, ERR_INVALID_PARAMETER, "The 'channels_config' array must contain only enum values from 'MultiplayerPeer.Multiplayer::TransferMode'");
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int mode = p_channels_config[i].operator int();
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// Initialize data channel configurations.
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Dictionary cfg;
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cfg["id"] = CH_RESERVED_MAX + i + 1;
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cfg["negotiated"] = true;
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cfg["ordered"] = true;
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switch (mode) {
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case Multiplayer::TRANSFER_MODE_UNRELIABLE_ORDERED:
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cfg["maxPacketLifetime"] = 1;
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break;
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case Multiplayer::TRANSFER_MODE_UNRELIABLE:
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cfg["maxPacketLifetime"] = 1;
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cfg["ordered"] = false;
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break;
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case Multiplayer::TRANSFER_MODE_RELIABLE:
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break;
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default:
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ERR_FAIL_V_MSG(ERR_INVALID_PARAMETER, vformat("The 'channels_config' array must contain only enum values from 'MultiplayerPeer.Multiplayer::TransferMode'. Got: %d", mode));
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}
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channels_config.push_back(cfg);
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}
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unique_id = p_self_id;
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server_compat = p_server_compat;
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// Mesh and server are always connected
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if (!server_compat || p_self_id == 1) {
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connection_status = CONNECTION_CONNECTED;
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} else {
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connection_status = CONNECTION_CONNECTING;
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}
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return OK;
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}
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int WebRTCMultiplayerPeer::get_unique_id() const {
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ERR_FAIL_COND_V(connection_status == CONNECTION_DISCONNECTED, 1);
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return unique_id;
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}
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void WebRTCMultiplayerPeer::_peer_to_dict(Ref<ConnectedPeer> p_connected_peer, Dictionary &r_dict) {
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Array channels;
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for (Ref<WebRTCDataChannel> &F : p_connected_peer->channels) {
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channels.push_back(F);
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}
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r_dict["connection"] = p_connected_peer->connection;
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r_dict["connected"] = p_connected_peer->connected;
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r_dict["channels"] = channels;
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}
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bool WebRTCMultiplayerPeer::has_peer(int p_peer_id) {
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return peer_map.has(p_peer_id);
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}
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Dictionary WebRTCMultiplayerPeer::get_peer(int p_peer_id) {
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ERR_FAIL_COND_V(!peer_map.has(p_peer_id), Dictionary());
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Dictionary out;
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_peer_to_dict(peer_map[p_peer_id], out);
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return out;
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}
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Dictionary WebRTCMultiplayerPeer::get_peers() {
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Dictionary out;
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for (const KeyValue<int, Ref<ConnectedPeer>> &E : peer_map) {
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Dictionary d;
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_peer_to_dict(E.value, d);
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out[E.key] = d;
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}
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return out;
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}
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Error WebRTCMultiplayerPeer::add_peer(Ref<WebRTCPeerConnection> p_peer, int p_peer_id, int p_unreliable_lifetime) {
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ERR_FAIL_COND_V(p_peer_id < 0 || p_peer_id > ~(1 << 31), ERR_INVALID_PARAMETER);
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ERR_FAIL_COND_V(p_unreliable_lifetime < 0, ERR_INVALID_PARAMETER);
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ERR_FAIL_COND_V(is_refusing_new_connections(), ERR_UNAUTHORIZED);
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// Peer must be valid, and in new state (to create data channels)
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ERR_FAIL_COND_V(!p_peer.is_valid(), ERR_INVALID_PARAMETER);
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ERR_FAIL_COND_V(p_peer->get_connection_state() != WebRTCPeerConnection::STATE_NEW, ERR_INVALID_PARAMETER);
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Ref<ConnectedPeer> peer = memnew(ConnectedPeer);
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peer->connection = p_peer;
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// Initialize data channels
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Dictionary cfg;
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cfg["negotiated"] = true;
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cfg["ordered"] = true;
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cfg["id"] = 1;
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peer->channels[CH_RELIABLE] = p_peer->create_data_channel("reliable", cfg);
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ERR_FAIL_COND_V(peer->channels[CH_RELIABLE].is_null(), FAILED);
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cfg["id"] = 2;
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cfg["maxPacketLifetime"] = p_unreliable_lifetime;
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peer->channels[CH_ORDERED] = p_peer->create_data_channel("ordered", cfg);
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ERR_FAIL_COND_V(peer->channels[CH_ORDERED].is_null(), FAILED);
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cfg["id"] = 3;
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cfg["ordered"] = false;
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peer->channels[CH_UNRELIABLE] = p_peer->create_data_channel("unreliable", cfg);
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ERR_FAIL_COND_V(peer->channels[CH_UNRELIABLE].is_null(), FAILED);
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for (const Dictionary &dict : channels_config) {
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Ref<WebRTCDataChannel> ch = p_peer->create_data_channel(String::num_int64(dict["id"]), dict);
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ERR_FAIL_COND_V(ch.is_null(), FAILED);
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peer->channels.push_back(ch);
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}
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peer_map[p_peer_id] = peer; // add the new peer connection to the peer_map
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return OK;
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}
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void WebRTCMultiplayerPeer::remove_peer(int p_peer_id) {
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ERR_FAIL_COND(!peer_map.has(p_peer_id));
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Ref<ConnectedPeer> peer = peer_map[p_peer_id];
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peer_map.erase(p_peer_id);
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if (peer->connected) {
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peer->connected = false;
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emit_signal(SNAME("peer_disconnected"), p_peer_id);
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if (server_compat && p_peer_id == TARGET_PEER_SERVER) {
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emit_signal(SNAME("server_disconnected"));
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connection_status = CONNECTION_DISCONNECTED;
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}
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}
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}
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Error WebRTCMultiplayerPeer::get_packet(const uint8_t **r_buffer, int &r_buffer_size) {
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// Peer not available
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if (next_packet_peer == 0 || !peer_map.has(next_packet_peer)) {
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_find_next_peer();
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ERR_FAIL_V(ERR_UNAVAILABLE);
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}
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for (Ref<WebRTCDataChannel> &E : peer_map[next_packet_peer]->channels) {
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if (E->get_available_packet_count()) {
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Error err = E->get_packet(r_buffer, r_buffer_size);
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_find_next_peer();
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return err;
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}
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}
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// Channels for that peer were empty. Bug?
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_find_next_peer();
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ERR_FAIL_V(ERR_BUG);
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}
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Error WebRTCMultiplayerPeer::put_packet(const uint8_t *p_buffer, int p_buffer_size) {
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ERR_FAIL_COND_V(connection_status == CONNECTION_DISCONNECTED, ERR_UNCONFIGURED);
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int ch = get_transfer_channel();
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if (ch == 0) {
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switch (get_transfer_mode()) {
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case Multiplayer::TRANSFER_MODE_RELIABLE:
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ch = CH_RELIABLE;
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break;
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case Multiplayer::TRANSFER_MODE_UNRELIABLE_ORDERED:
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ch = CH_ORDERED;
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break;
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case Multiplayer::TRANSFER_MODE_UNRELIABLE:
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ch = CH_UNRELIABLE;
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break;
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}
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} else {
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ch += CH_RESERVED_MAX - 1;
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}
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Map<int, Ref<ConnectedPeer>>::Element *E = nullptr;
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if (target_peer > 0) {
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E = peer_map.find(target_peer);
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ERR_FAIL_COND_V_MSG(!E, ERR_INVALID_PARAMETER, "Invalid target peer: " + itos(target_peer) + ".");
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ERR_FAIL_COND_V_MSG(E->value()->channels.size() <= ch, ERR_INVALID_PARAMETER, vformat("Unable to send packet on channel %d, max channels: %d", ch, E->value()->channels.size()));
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ERR_FAIL_COND_V(E->value()->channels[ch].is_null(), ERR_BUG);
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return E->value()->channels[ch]->put_packet(p_buffer, p_buffer_size);
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} else {
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int exclude = -target_peer;
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for (KeyValue<int, Ref<ConnectedPeer>> &F : peer_map) {
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// Exclude packet. If target_peer == 0 then don't exclude any packets
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if (target_peer != 0 && F.key == exclude) {
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continue;
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}
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ERR_CONTINUE_MSG(F.value->channels.size() <= ch, vformat("Unable to send packet on channel %d, max channels: %d", ch, E->value()->channels.size()));
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ERR_CONTINUE(F.value->channels[ch].is_null());
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F.value->channels[ch]->put_packet(p_buffer, p_buffer_size);
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}
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}
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return OK;
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}
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int WebRTCMultiplayerPeer::get_available_packet_count() const {
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if (next_packet_peer == 0) {
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return 0; // To be sure next call to get_packet works if size > 0 .
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}
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int size = 0;
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for (const KeyValue<int, Ref<ConnectedPeer>> &E : peer_map) {
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if (!E.value->connected) {
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continue;
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}
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for (const Ref<WebRTCDataChannel> &F : E.value->channels) {
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size += F->get_available_packet_count();
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}
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}
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return size;
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}
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int WebRTCMultiplayerPeer::get_max_packet_size() const {
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return 1200;
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}
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void WebRTCMultiplayerPeer::close() {
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peer_map.clear();
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channels_config.clear();
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unique_id = 0;
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next_packet_peer = 0;
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target_peer = 0;
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connection_status = CONNECTION_DISCONNECTED;
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}
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WebRTCMultiplayerPeer::~WebRTCMultiplayerPeer() {
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close();
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}
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