public ClientEngine(EngineSettings settings)
{
settings = settings ?? throw new ArgumentNullException(nameof(settings));
// This is just a sanity check to make sure the ReusableTasks.dll assembly is
// loadable.
GC.KeepAlive(ReusableTasks.ReusableTask.CompletedTask);
PeerId = GeneratePeerId();
Settings = settings ?? throw new ArgumentNullException(nameof(settings));
CheckSettingsAreValid(Settings);
allTorrents = new List <TorrentManager> ();
publicTorrents = new List <TorrentManager> ();
Torrents = new ReadOnlyCollection <TorrentManager> (publicTorrents);
DiskManager = new DiskManager(Settings);
DiskManager.ChangePieceWriter(new DiskWriter(Settings.MaximumOpenFiles));
ConnectionManager = new ConnectionManager(PeerId, Settings, DiskManager);
listenManager = new ListenManager(this);
PortForwarder = new MonoNatPortForwarder();
MainLoop.QueueTimeout(TimeSpan.FromMilliseconds(TickLength), delegate {
if (IsRunning && !Disposed)
{
LogicTick();
}
return(!Disposed);
});
downloadLimiter = new RateLimiter();
downloadLimiters = new RateLimiterGroup {
new DiskWriterLimiter(DiskManager),
downloadLimiter,
};
uploadLimiter = new RateLimiter();
uploadLimiters = new RateLimiterGroup {
uploadLimiter
};
Listener = PeerListenerFactory.CreateTcp(settings.ListenPort);
listenManager.SetListener(Listener);
DhtListener = DhtListenerFactory.CreateUdp(settings.DhtPort);
DhtEngine = settings.DhtPort == -1 ? new NullDhtEngine() : DhtEngineFactory.Create(DhtListener);
DhtEngine.StateChanged += DhtEngineStateChanged;
DhtEngine.PeersFound += DhtEnginePeersFound;
RegisterLocalPeerDiscovery(settings.AllowLocalPeerDiscovery && settings.ListenPort > 0 ? LocalPeerDiscoveryFactory.Create(settings.ListenPort) : null);
}
async Task UpdateSettingsAsync(EngineSettings oldSettings, EngineSettings newSettings)
{
await DiskManager.UpdateSettingsAsync(newSettings);
if (newSettings.DiskCacheBytes != oldSettings.DiskCacheBytes)
{
await Task.WhenAll(Torrents.Select(t => DiskManager.FlushAsync(t)));
}
ConnectionManager.Settings = newSettings;
if (oldSettings.AllowPortForwarding != newSettings.AllowPortForwarding)
{
if (newSettings.AllowPortForwarding)
{
await PortForwarder.StartAsync(CancellationToken.None);
}
else
{
await PortForwarder.StopAsync(removeExistingMappings : true, CancellationToken.None);
}
}
if (oldSettings.DhtPort != newSettings.DhtPort)
{
if (DhtListener.EndPoint != null)
{
await PortForwarder.UnregisterMappingAsync(new Mapping (Protocol.Udp, DhtListener.EndPoint.Port), CancellationToken.None);
}
else if (oldSettings.DhtPort > 0)
{
await PortForwarder.UnregisterMappingAsync(new Mapping (Protocol.Udp, oldSettings.DhtPort), CancellationToken.None);
}
DhtListener = DhtListenerFactory.CreateUdp(newSettings.DhtPort);
if (oldSettings.DhtPort == -1)
{
await RegisterDht(DhtEngineFactory.Create(DhtListener));
}
else if (newSettings.DhtPort == -1)
{
await RegisterDht(new NullDhtEngine());
}
DhtEngine.SetListener(DhtListener);
if (IsRunning)
{
DhtListener.Start();
if (Listener is ISocketListener newDhtListener)
{
await PortForwarder.RegisterMappingAsync(new Mapping (Protocol.Udp, newDhtListener.EndPoint.Port));
}
else
{
await PortForwarder.RegisterMappingAsync(new Mapping (Protocol.Udp, newSettings.DhtPort));
}
}
}
if (oldSettings.ListenPort != newSettings.ListenPort)
{
if (Listener is ISocketListener oldListener)
{
await PortForwarder.UnregisterMappingAsync(new Mapping (Protocol.Tcp, oldListener.EndPoint.Port), CancellationToken.None);
}
else if (oldSettings.ListenPort > 0)
{
await PortForwarder.UnregisterMappingAsync(new Mapping (Protocol.Tcp, oldSettings.ListenPort), CancellationToken.None);
}
Listener.Stop();
Listener = PeerListenerFactory.CreateTcp(newSettings.ListenPort);
listenManager.SetListener(Listener);
if (IsRunning)
{
Listener.Start();
// The settings could say to listen at port 0, which means 'choose one dynamically'
if (Listener is ISocketListener peerListener)
{
await PortForwarder.RegisterMappingAsync(new Mapping (Protocol.Tcp, peerListener.EndPoint.Port));
}
else
{
await PortForwarder.RegisterMappingAsync(new Mapping (Protocol.Tcp, newSettings.ListenPort));
}
}
}
// This depends on the Listener binding to it's local port.
var localPort = newSettings.ListenPort;
if (Listener is ISocketListener newListener)
{
localPort = newListener.EndPoint.Port;
}
if ((oldSettings.AllowLocalPeerDiscovery != newSettings.AllowLocalPeerDiscovery) ||
(oldSettings.ListenPort != newSettings.ListenPort))
{
RegisterLocalPeerDiscovery(newSettings.AllowLocalPeerDiscovery && localPort > 0 ? new LocalPeerDiscovery(localPort) : null);
}
}