godotengine
/
godot
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
godot/modules/webrtc/webrtc_multiplayer.cpp

403 lines
13 KiB
C++
Raw Permalink Blame History

/*************************************************************************/
/* webrtc_multiplayer.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 "webrtc_multiplayer.h"
#include "core/io/marshalls.h"
#include "core/os/os.h"
void WebRTCMultiplayer::_bind_methods() {
ClassDB::bind_method(D_METHOD("initialize", "peer_id", "server_compatibility"), &WebRTCMultiplayer::initialize, DEFVAL(false));
ClassDB::bind_method(D_METHOD("add_peer", "peer", "peer_id", "unreliable_lifetime"), &WebRTCMultiplayer::add_peer, DEFVAL(1));
ClassDB::bind_method(D_METHOD("remove_peer", "peer_id"), &WebRTCMultiplayer::remove_peer);
ClassDB::bind_method(D_METHOD("has_peer", "peer_id"), &WebRTCMultiplayer::has_peer);
ClassDB::bind_method(D_METHOD("get_peer", "peer_id"), &WebRTCMultiplayer::get_peer);
ClassDB::bind_method(D_METHOD("get_peers"), &WebRTCMultiplayer::get_peers);
ClassDB::bind_method(D_METHOD("close"), &WebRTCMultiplayer::close);
}
void WebRTCMultiplayer::set_transfer_mode(TransferMode p_mode) {
transfer_mode = p_mode;
}
NetworkedMultiplayerPeer::TransferMode WebRTCMultiplayer::get_transfer_mode() const {
return transfer_mode;
}
void WebRTCMultiplayer::set_target_peer(int p_peer_id) {
target_peer = p_peer_id;
}
/* Returns the ID of the NetworkedMultiplayerPeer who sent the most recent packet: */
int WebRTCMultiplayer::get_packet_peer() const {
return next_packet_peer;
}
bool WebRTCMultiplayer::is_server() const {
return unique_id == TARGET_PEER_SERVER;
}
void WebRTCMultiplayer::poll() {
if (peer_map.size() == 0) {
return;
}
List<int> remove;
List<int> add;
for (Map<int, Ref<ConnectedPeer>>::Element *E = peer_map.front(); E; E = E->next()) {
Ref<ConnectedPeer> peer = E->get();
peer->connection->poll();
// Check peer state
switch (peer->connection->get_connection_state()) {
case WebRTCPeerConnection::STATE_NEW:
case WebRTCPeerConnection::STATE_CONNECTING:
// Go to next peer, not ready yet.
continue;
case WebRTCPeerConnection::STATE_CONNECTED:
// Good to go, go ahead and check channel state.
break;
default:
// Peer is closed or in error state. Got to next peer.
remove.push_back(E->key());
continue;
}
// Check channels state
int ready = 0;
for (List<Ref<WebRTCDataChannel>>::Element *C = peer->channels.front(); C && C->get().is_valid(); C = C->next()) {
Ref<WebRTCDataChannel> ch = C->get();
switch (ch->get_ready_state()) {
case WebRTCDataChannel::STATE_CONNECTING:
continue;
case WebRTCDataChannel::STATE_OPEN:
ready++;
continue;
default:
// Channel was closed or in error state, remove peer id.
remove.push_back(E->key());
}
// We got a closed channel break out, the peer will be removed.
break;
}
// This peer has newly connected, and all channels are now open.
if (ready == peer->channels.size() && !peer->connected) {
peer->connected = true;
add.push_back(E->key());
}
}
// Remove disconnected peers
for (List<int>::Element *E = remove.front(); E; E = E->next()) {
remove_peer(E->get());
if (next_packet_peer == E->get()) {
next_packet_peer = 0;
}
}
// Signal newly connected peers
for (List<int>::Element *E = add.front(); E; E = E->next()) {
// Already connected to server: simply notify new peer.
// NOTE: Mesh is always connected.
if (connection_status == CONNECTION_CONNECTED) {
emit_signal("peer_connected", E->get());
}
// Server emulation mode suppresses peer_conencted until server connects.
if (server_compat && E->get() == TARGET_PEER_SERVER) {
// Server connected.
connection_status = CONNECTION_CONNECTED;
emit_signal("peer_connected", TARGET_PEER_SERVER);
emit_signal("connection_succeeded");
// Notify of all previously connected peers
for (Map<int, Ref<ConnectedPeer>>::Element *F = peer_map.front(); F; F = F->next()) {
if (F->key() != 1 && F->get()->connected) {
emit_signal("peer_connected", F->key());
}
}
break; // Because we already notified of all newly added peers.
}
}
// Fetch next packet
if (next_packet_peer == 0) {
_find_next_peer();
}
}
void WebRTCMultiplayer::_find_next_peer() {
Map<int, Ref<ConnectedPeer>>::Element *E = peer_map.find(next_packet_peer);
if (E) {
E = E->next();
}
// After last.
while (E) {
if (!E->get()->connected) {
E = E->next();
continue;
}
for (List<Ref<WebRTCDataChannel>>::Element *F = E->get()->channels.front(); F; F = F->next()) {
if (F->get()->get_available_packet_count()) {
next_packet_peer = E->key();
return;
}
}
E = E->next();
}
E = peer_map.front();
// Before last
while (E) {
if (!E->get()->connected) {
E = E->next();
continue;
}
for (List<Ref<WebRTCDataChannel>>::Element *F = E->get()->channels.front(); F; F = F->next()) {
if (F->get()->get_available_packet_count()) {
next_packet_peer = E->key();
return;
}
}
if (E->key() == (int)next_packet_peer) {
break;
}
E = E->next();
}
// No packet found
next_packet_peer = 0;
}
void WebRTCMultiplayer::set_refuse_new_connections(bool p_enable) {
refuse_connections = p_enable;
}
bool WebRTCMultiplayer::is_refusing_new_connections() const {
return refuse_connections;
}
NetworkedMultiplayerPeer::ConnectionStatus WebRTCMultiplayer::get_connection_status() const {
return connection_status;
}
Error WebRTCMultiplayer::initialize(int p_self_id, bool p_server_compat) {
ERR_FAIL_COND_V(p_self_id < 0 || p_self_id > ~(1 << 31), ERR_INVALID_PARAMETER);
unique_id = p_self_id;
server_compat = p_server_compat;
// Mesh and server are always connected
if (!server_compat || p_self_id == 1) {
connection_status = CONNECTION_CONNECTED;
} else {
connection_status = CONNECTION_CONNECTING;
}
return OK;
}
int WebRTCMultiplayer::get_unique_id() const {
ERR_FAIL_COND_V(connection_status == CONNECTION_DISCONNECTED, 1);
return unique_id;
}
void WebRTCMultiplayer::_peer_to_dict(Ref<ConnectedPeer> p_connected_peer, Dictionary &r_dict) {
Array channels;
for (List<Ref<WebRTCDataChannel>>::Element *F = p_connected_peer->channels.front(); F; F = F->next()) {
channels.push_back(F->get());
}
r_dict["connection"] = p_connected_peer->connection;
r_dict["connected"] = p_connected_peer->connected;
r_dict["channels"] = channels;
}
bool WebRTCMultiplayer::has_peer(int p_peer_id) {
return peer_map.has(p_peer_id);
}
Dictionary WebRTCMultiplayer::get_peer(int p_peer_id) {
ERR_FAIL_COND_V(!peer_map.has(p_peer_id), Dictionary());
Dictionary out;
_peer_to_dict(peer_map[p_peer_id], out);
return out;
}
Dictionary WebRTCMultiplayer::get_peers() {
Dictionary out;
for (Map<int, Ref<ConnectedPeer>>::Element *E = peer_map.front(); E; E = E->next()) {
Dictionary d;
_peer_to_dict(E->get(), d);
out[E->key()] = d;
}
return out;
}
Error WebRTCMultiplayer::add_peer(Ref<WebRTCPeerConnection> p_peer, int p_peer_id, int p_unreliable_lifetime) {
ERR_FAIL_COND_V(p_peer_id < 0 || p_peer_id > ~(1 << 31), ERR_INVALID_PARAMETER);
ERR_FAIL_COND_V(p_unreliable_lifetime < 0, ERR_INVALID_PARAMETER);
ERR_FAIL_COND_V(refuse_connections, ERR_UNAUTHORIZED);
// Peer must be valid, and in new state (to create data channels)
ERR_FAIL_COND_V(!p_peer.is_valid(), ERR_INVALID_PARAMETER);
ERR_FAIL_COND_V(p_peer->get_connection_state() != WebRTCPeerConnection::STATE_NEW, ERR_INVALID_PARAMETER);
Ref<ConnectedPeer> peer = memnew(ConnectedPeer);
peer->connection = p_peer;
// Initialize data channels
Dictionary cfg;
cfg["negotiated"] = true;
cfg["ordered"] = true;
cfg["id"] = 1;
peer->channels[CH_RELIABLE] = p_peer->create_data_channel("reliable", cfg);
ERR_FAIL_COND_V(!peer->channels[CH_RELIABLE].is_valid(), FAILED);
cfg["id"] = 2;
cfg["maxPacketLifetime"] = p_unreliable_lifetime;
peer->channels[CH_ORDERED] = p_peer->create_data_channel("ordered", cfg);
ERR_FAIL_COND_V(!peer->channels[CH_ORDERED].is_valid(), FAILED);
cfg["id"] = 3;
cfg["ordered"] = false;
peer->channels[CH_UNRELIABLE] = p_peer->create_data_channel("unreliable", cfg);
ERR_FAIL_COND_V(!peer->channels[CH_UNRELIABLE].is_valid(), FAILED);
peer_map[p_peer_id] = peer; // add the new peer connection to the peer_map
return OK;
}
void WebRTCMultiplayer::remove_peer(int p_peer_id) {
ERR_FAIL_COND(!peer_map.has(p_peer_id));
Ref<ConnectedPeer> peer = peer_map[p_peer_id];
peer_map.erase(p_peer_id);
if (peer->connected) {
peer->connected = false;
emit_signal("peer_disconnected", p_peer_id);
if (server_compat && p_peer_id == TARGET_PEER_SERVER) {
emit_signal("server_disconnected");
connection_status = CONNECTION_DISCONNECTED;
}
}
}
Error WebRTCMultiplayer::get_packet(const uint8_t **r_buffer, int &r_buffer_size) {
// Peer not available
if (next_packet_peer == 0 || !peer_map.has(next_packet_peer)) {
_find_next_peer();
ERR_FAIL_V(ERR_UNAVAILABLE);
}
for (List<Ref<WebRTCDataChannel>>::Element *E = peer_map[next_packet_peer]->channels.front(); E; E = E->next()) {
if (E->get()->get_available_packet_count()) {
Error err = E->get()->get_packet(r_buffer, r_buffer_size);
_find_next_peer();
return err;
}
}
// Channels for that peer were empty. Bug?
_find_next_peer();
ERR_FAIL_V(ERR_BUG);
}
Error WebRTCMultiplayer::put_packet(const uint8_t *p_buffer, int p_buffer_size) {
ERR_FAIL_COND_V(connection_status == CONNECTION_DISCONNECTED, ERR_UNCONFIGURED);
int ch = CH_RELIABLE;
switch (transfer_mode) {
case TRANSFER_MODE_RELIABLE:
ch = CH_RELIABLE;
break;
case TRANSFER_MODE_UNRELIABLE_ORDERED:
ch = CH_ORDERED;
break;
case TRANSFER_MODE_UNRELIABLE:
ch = CH_UNRELIABLE;
break;
}
Map<int, Ref<ConnectedPeer>>::Element *E = nullptr;
if (target_peer > 0) {
E = peer_map.find(target_peer);
ERR_FAIL_COND_V_MSG(!E, ERR_INVALID_PARAMETER, "Invalid target peer: " + itos(target_peer) + ".");
ERR_FAIL_COND_V(E->value()->channels.size() <= ch, ERR_BUG);
ERR_FAIL_COND_V(!E->value()->channels[ch].is_valid(), ERR_BUG);
return E->value()->channels[ch]->put_packet(p_buffer, p_buffer_size);
} else {
int exclude = -target_peer;
for (Map<int, Ref<ConnectedPeer>>::Element *F = peer_map.front(); F; F = F->next()) {
// Exclude packet. If target_peer == 0 then don't exclude any packets
if (target_peer != 0 && F->key() == exclude) {
continue;
}
ERR_CONTINUE(F->value()->channels.size() <= ch || !F->value()->channels[ch].is_valid());
F->value()->channels[ch]->put_packet(p_buffer, p_buffer_size);
}
}
return OK;
}
int WebRTCMultiplayer::get_available_packet_count() const {
if (next_packet_peer == 0) {
return 0; // To be sure next call to get_packet works if size > 0 .
}
int size = 0;
for (Map<int, Ref<ConnectedPeer>>::Element *E = peer_map.front(); E; E = E->next()) {
if (!E->get()->connected) {
continue;
}
for (List<Ref<WebRTCDataChannel>>::Element *F = E->get()->channels.front(); F; F = F->next()) {
size += F->get()->get_available_packet_count();
}
}
return size;
}
int WebRTCMultiplayer::get_max_packet_size() const {
return 1200;
}
void WebRTCMultiplayer::close() {
peer_map.clear();
unique_id = 0;
next_packet_peer = 0;
target_peer = 0;
connection_status = CONNECTION_DISCONNECTED;
}
WebRTCMultiplayer::WebRTCMultiplayer() {
unique_id = 0;
next_packet_peer = 0;
target_peer = 0;
transfer_mode = TRANSFER_MODE_RELIABLE;
refuse_connections = false;
connection_status = CONNECTION_DISCONNECTED;
server_compat = false;
}
WebRTCMultiplayer::~WebRTCMultiplayer() {
close();
}
Reference in New Issue View Git Blame Copy Permalink