public async Task <IConnection> ChangeProtocolVersion(
Configuration config,
ISerializerManager serializer,
ProtocolVersion nextVersion,
IConnection previousConnection,
UnsupportedProtocolVersionException ex = null,
ProtocolVersion?previousVersion = null)
{
if (!nextVersion.IsSupported() || nextVersion == previousVersion)
{
nextVersion = nextVersion.GetLowerSupported();
}
if (nextVersion == 0)
{
if (ex != null)
{
// We have downgraded the version until is 0 and none of those are supported
throw ex;
}
// There was no exception leading to the downgrade, signal internal error
throw new DriverInternalError("Connection was unable to STARTUP using protocol version 0");
}
ControlConnection.Logger.Info(ex != null
? $"{ex.Message}, trying with version {nextVersion:D}"
: $"Changing protocol version to {nextVersion:D}");
serializer.ChangeProtocolVersion(nextVersion);
previousConnection.Dispose();
var c = config.ConnectionFactory.CreateUnobserved(
serializer.GetCurrentSerializer(),
previousConnection.EndPoint,
config);
try
{
await c.Open().ConfigureAwait(false);
return(c);
}
catch
{
c.Dispose();
throw;
}
}