/// <inheritdoc/>
public async Task RespondToHandShakeAsync(CancellationToken cancellationToken = default(CancellationToken))
{
this.logger.LogTrace("()");
using (var listener = new NetworkPeerListener(this))
{
this.logger.LogTrace("Responding to handshake with my version.");
await this.SendMessageAsync(this.MyVersion, cancellationToken).ConfigureAwait(false);
this.logger.LogTrace("Waiting for version acknowledgement or rejection message.");
while (this.State != NetworkPeerState.HandShaked)
{
Payload payload = await listener.ReceivePayloadAsync <Payload>(cancellationToken).ConfigureAwait(false);
switch (payload)
{
case RejectPayload rejectPayload:
this.logger.LogTrace("Version rejected: code {0}, reason '{1}'.", rejectPayload.Code, rejectPayload.Reason);
this.logger.LogTrace("(-)[VERSION_REJECTED]");
throw new ProtocolException("Version rejected " + rejectPayload.Code + ": " + rejectPayload.Reason);
case VerAckPayload verAckPayload:
this.logger.LogTrace("Sending version acknowledgement.");
await this.SendMessageAsync(new VerAckPayload(), cancellationToken).ConfigureAwait(false);
await this.SetStateAsync(NetworkPeerState.HandShaked).ConfigureAwait(false);
break;
}
}
}
this.logger.LogTrace("(-)");
}
/// <inheritdoc/>
public async Task VersionHandshakeAsync(NetworkPeerRequirement requirements, CancellationToken cancellationToken)
{
this.logger.LogTrace("({0}.{1}:{2})", nameof(requirements), nameof(requirements.RequiredServices), requirements?.RequiredServices);
requirements = requirements ?? new NetworkPeerRequirement();
using (var listener = new NetworkPeerListener(this))
{
this.logger.LogTrace("Sending my version.");
await this.SendMessageAsync(this.MyVersion, cancellationToken).ConfigureAwait(false);
this.logger.LogTrace("Waiting for version or rejection message.");
bool versionReceived = false;
bool verAckReceived = false;
while (!versionReceived || !verAckReceived)
{
Payload payload = await listener.ReceivePayloadAsync <Payload>(cancellationToken).ConfigureAwait(false);
switch (payload)
{
case RejectPayload rejectPayload:
this.logger.LogTrace("(-)[HANDSHAKE_REJECTED]");
throw new ProtocolException("Handshake rejected: " + rejectPayload.Reason);
case VersionPayload versionPayload:
versionReceived = true;
this.PeerVersion = versionPayload;
if (!versionPayload.AddressReceiver.Address.Equals(this.MyVersion.AddressFrom.Address))
{
this.logger.LogDebug("Different external address detected by the node '{0}' instead of '{1}'.", versionPayload.AddressReceiver.Address, this.MyVersion.AddressFrom.Address);
}
if (versionPayload.Version < ProtocolVersion.MIN_PEER_PROTO_VERSION)
{
this.logger.LogDebug("Outdated version {0} received, disconnecting peer.", versionPayload.Version);
this.Disconnect("Outdated version");
this.logger.LogTrace("(-)[OUTDATED]");
return;
}
if (!requirements.Check(versionPayload))
{
this.logger.LogTrace("(-)[UNSUPPORTED_REQUIREMENTS]");
this.Disconnect("The peer does not support the required services requirement");
return;
}
this.logger.LogTrace("Sending version acknowledgement.");
await this.SendMessageAsync(new VerAckPayload(), cancellationToken).ConfigureAwait(false);
break;
case VerAckPayload verAckPayload:
verAckReceived = true;
break;
}
}
await this.SetStateAsync(NetworkPeerState.HandShaked).ConfigureAwait(false);
if (this.advertize && this.MyVersion.AddressFrom.Address.IsRoutable(true))
{
var addrPayload = new AddrPayload
(
new NetworkAddress(this.MyVersion.AddressFrom)
{
Time = this.dateTimeProvider.GetTimeOffset()
}
);
await this.SendMessageAsync(addrPayload, cancellationToken).ConfigureAwait(false);
}
}
this.logger.LogTrace("(-)");
}