private static void SendTcpVersionInfo(JsonOperationContext context, BlittableJsonTextWriter writer, TcpNegotiateParameters parameters, int currentVersion)
{
if (Log.IsInfoEnabled)
{
Log.Info($"Send negotiation for {parameters.Operation} in version {currentVersion}");
}
context.Write(writer, new DynamicJsonValue
{
[nameof(TcpConnectionHeaderMessage.DatabaseName)] = parameters.Database,
[nameof(TcpConnectionHeaderMessage.Operation)] = parameters.Operation.ToString(),
[nameof(TcpConnectionHeaderMessage.SourceNodeTag)] = parameters.SourceNodeTag,
[nameof(TcpConnectionHeaderMessage.OperationVersion)] = currentVersion
});
writer.Flush();
}
public static TcpConnectionHeaderMessage.SupportedFeatures NegotiateProtocolVersion(JsonOperationContext context, Stream stream, TcpNegotiateParameters parameters)
{
if (Log.IsInfoEnabled)
{
Log.Info($"Start negotiation for {parameters.Operation} operation with {parameters.DestinationNodeTag ?? parameters.DestinationUrl}");
}
using (var writer = new BlittableJsonTextWriter(context, stream))
{
var current = parameters.Version;
while (true)
{
if (parameters.CancellationToken.IsCancellationRequested)
{
throw new OperationCanceledException($"Stopped TCP negotiation for {parameters.Operation} because of cancellation request");
}
SendTcpVersionInfo(context, writer, parameters, current);
var version = parameters.ReadResponseAndGetVersionCallback(context, writer, stream, parameters.DestinationUrl);
if (Log.IsInfoEnabled)
{
Log.Info($"Read response from {parameters.SourceNodeTag ?? parameters.DestinationUrl} for '{parameters.Operation}', received version is '{version}'");
}
if (version == current)
{
break;
}
//In this case we usually throw internally but for completeness we better handle it
if (version == DropStatus)
{
return(TcpConnectionHeaderMessage.GetSupportedFeaturesFor(TcpConnectionHeaderMessage.OperationTypes.Drop, TcpConnectionHeaderMessage.DropBaseLine));
}
var status = TcpConnectionHeaderMessage.OperationVersionSupported(parameters.Operation, version, out current);
if (status == TcpConnectionHeaderMessage.SupportedStatus.OutOfRange)
{
SendTcpVersionInfo(context, writer, parameters, OutOfRangeStatus);
throw new ArgumentException($"The {parameters.Operation} version {parameters.Version} is out of range, our lowest version is {current}");
}
if (Log.IsInfoEnabled)
{
Log.Info($"The version {version} is {status}, will try to agree on '{current}' for {parameters.Operation} with {parameters.DestinationNodeTag ?? parameters.DestinationUrl}.");
}
}
if (Log.IsInfoEnabled)
{
Log.Info($"{parameters.DestinationNodeTag ?? parameters.DestinationUrl} agreed on version '{current}' for {parameters.Operation}.");
}
return(TcpConnectionHeaderMessage.GetSupportedFeaturesFor(parameters.Operation, current));
}
}
