/// <summary>Attempts to connect to a random peer.</summary>
internal async Task ConnectAsync(PeerAddress peerAddress)
{
if (this.selfEndpointTracker.IsSelf(peerAddress.Endpoint))
{
this.logger.LogTrace("{0} is self. Therefore not connecting.", peerAddress.Endpoint);
return;
}
// Connect if local, ip range filtering disabled or ip range filtering enabled and peer in a different group.
if (peerAddress.Endpoint.Address.IsRoutable(false) && this.ConnectionSettings.IpRangeFiltering && this.PeerIsPartOfExistingGroup(peerAddress))
{
this.logger.LogTrace("(-)[RANGE_FILTERED]");
return;
}
INetworkPeer peer = null;
try
{
using (CancellationTokenSource timeoutTokenSource = CancellationTokenSource.CreateLinkedTokenSource(this.nodeLifetime.ApplicationStopping))
{
this.peerAddressManager.PeerAttempted(peerAddress.Endpoint, this.dateTimeProvider.GetUtcNow());
NetworkPeerConnectionParameters clonedConnectParamaters = this.CurrentParameters.Clone();
timeoutTokenSource.CancelAfter(5000);
clonedConnectParamaters.ConnectCancellation = timeoutTokenSource.Token;
peer = await this.networkPeerFactory.CreateConnectedNetworkPeerAsync(peerAddress.Endpoint, clonedConnectParamaters, this.networkPeerDisposer).ConfigureAwait(false);
await peer.VersionHandshakeAsync(this.Requirements, timeoutTokenSource.Token).ConfigureAwait(false);
this.AddPeer(peer);
}
}
catch (OperationCanceledException)
{
if (this.nodeLifetime.ApplicationStopping.IsCancellationRequested)
{
this.logger.LogDebug("Peer {0} connection canceled because application is stopping.", peerAddress.Endpoint);
peer?.Disconnect("Application stopping");
}
else
{
this.logger.LogDebug("Peer {0} connection timeout.", peerAddress.Endpoint);
peerAddress.SetHandshakeAttempted(this.dateTimeProvider.GetUtcNow());
peer?.Disconnect("Connection timeout");
}
}
catch (NBitcoin.Protocol.ProtocolException)
{
this.logger.LogDebug("Handshake rejected by peer '{0}'.", peerAddress.Endpoint);
peerAddress.SetHandshakeAttempted(this.dateTimeProvider.GetUtcNow());
peer?.Disconnect("Error while handshaking");
}
catch (Exception exception)
{
this.logger.LogTrace("Exception occurred while connecting: {0}", exception.ToString());
peerAddress.SetHandshakeAttempted(this.dateTimeProvider.GetUtcNow());
peer?.Disconnect("Error while connecting", exception);
}
}
/// <summary>Attempts to connect to a random peer.</summary>
public async Task ConnectAsync(PeerAddress peerAddress)
{
if (this.selfEndpointTracker.IsSelf(peerAddress.Endpoint))
{
this.logger.LogDebug("Connect aborted: {0} is self.", peerAddress.Endpoint);
return;
}
if (this.IsPeerConnected(peerAddress.Endpoint))
{
this.logger.LogDebug("Connect aborted: {0} is already connected.", peerAddress.Endpoint);
return;
}
if (peerAddress.IsBanned(this.dateTimeProvider.GetUtcNow()))
{
this.logger.LogDebug("Connect aborted: {0} is banned until {1}.", peerAddress.Endpoint, peerAddress.BanUntil);
return;
}
INetworkPeer peer = null;
try
{
using (CancellationTokenSource timeoutTokenSource = CancellationTokenSource.CreateLinkedTokenSource(this.NodeLifetime.ApplicationStopping))
{
this.PeerAddressManager.PeerAttempted(peerAddress.Endpoint, this.dateTimeProvider.GetUtcNow());
NetworkPeerConnectionParameters clonedConnectParameters = this.CurrentParameters.Clone();
timeoutTokenSource.CancelAfter(5000);
clonedConnectParameters.ConnectCancellation = timeoutTokenSource.Token;
peer = await this.networkPeerFactory.CreateConnectedNetworkPeerAsync(peerAddress.Endpoint, clonedConnectParameters, this.networkPeerDisposer).ConfigureAwait(false);
await peer.VersionHandshakeAsync(this.Requirements, timeoutTokenSource.Token).ConfigureAwait(false);
this.AddPeer(peer);
}
}
catch (OperationCanceledException)
{
if (this.NodeLifetime.ApplicationStopping.IsCancellationRequested)
{
this.logger.LogDebug("Peer {0} connection canceled because application is stopping.", peerAddress.Endpoint);
peer?.Disconnect("Application stopping");
}
else
{
this.logger.LogDebug("Peer {0} connection timeout.", peerAddress.Endpoint);
peerAddress.SetHandshakeAttempted(this.dateTimeProvider.GetUtcNow());
peer?.Disconnect("Connection timeout");
}
}
catch (NBitcoin.Protocol.ProtocolException)
{
this.logger.LogDebug("Handshake rejected by peer '{0}'.", peerAddress.Endpoint);
peerAddress.SetHandshakeAttempted(this.dateTimeProvider.GetUtcNow());
peer?.Disconnect("Error while handshaking");
}
catch (Exception exception)
{
this.logger.LogDebug("Exception occurred while connecting: {0}", exception is SocketException ? exception.Message : exception.ToString());
peerAddress.SetHandshakeAttempted(this.dateTimeProvider.GetUtcNow());
peer?.Disconnect("Error while connecting", exception);
}
}