private async ValueTask Open(bool async, CancellationToken cancellationToken)
{
if (!BitConverter.IsLittleEndian)
{
throw new NotSupportedException(
"An architecture of the processor is not supported. Only little-endian architectures are supported." + Environment.NewLine +
"Please, report an issue if you see this message (https://github.com/Octonica/ClickHouseClient/issues).");
}
var connectionState = _connectionState;
switch (connectionState.State)
{
case ConnectionState.Closed:
break;
case ConnectionState.Open:
return; // Re-entrance is allowed
case ConnectionState.Connecting:
throw new ClickHouseException(ClickHouseErrorCodes.InvalidConnectionState, "The connection is already opening.");
case ConnectionState.Broken:
throw new ClickHouseException(ClickHouseErrorCodes.InvalidConnectionState, "The connection is broken.");
default:
throw new NotSupportedException($"Internal error. The state {_connectionState} is not supported.");
}
if (!TryChangeConnectionState(connectionState, ConnectionState.Connecting, out connectionState, out var onStateChanged))
{
throw new ClickHouseException(ClickHouseErrorCodes.InvalidConnectionState, "The state of the connection was modified.");
}
var stateChangeEx = onStateChanged(this);
var connectionSettings = connectionState.Settings;
if (stateChangeEx != null || connectionSettings == null)
{
var initialEx = stateChangeEx ?? new ClickHouseException(ClickHouseErrorCodes.InvalidConnectionState, "The connection is not initialized.");
if (!TryChangeConnectionState(connectionState, ConnectionState.Closed, out _, out onStateChanged))
{
throw new AggregateException(initialEx, new ClickHouseException(ClickHouseErrorCodes.InvalidConnectionState, "The state of the connection was modified."));
}
var stateChangeEx2 = onStateChanged(this);
if (stateChangeEx2 != null)
{
throw new AggregateException(initialEx, stateChangeEx2);
}
if (stateChangeEx != null)
{
throw new ClickHouseException(ClickHouseErrorCodes.CallbackError, "External callback error. See the inner exception for details.", stateChangeEx);
}
throw initialEx;
}
const int defaultHttpPort = 8123;
TcpClient?client = null;
SslStream?sslStream = null;
ClickHouseBinaryProtocolWriter?writer = null;
ClickHouseBinaryProtocolReader?reader = null;
try
{
try
{
client = new TcpClient {
SendTimeout = connectionSettings.ReadWriteTimeout, ReceiveTimeout = connectionSettings.ReadWriteTimeout
};
if (async)
{
await client.ConnectAsync(connectionSettings.Host, connectionSettings.Port);
}
else
{
client.Connect(connectionSettings.Host, connectionSettings.Port);
}
}
catch
{
client?.Client?.Close(0);
client?.Dispose();
client = null;
throw;
}
if (connectionSettings.TlsMode == ClickHouseTlsMode.Require)
{
var certValidationCallback = RemoteCertificateValidationCallback;
if (certValidationCallback == null && (connectionSettings.RootCertificate != null || !connectionSettings.ServerCertificateHash.IsEmpty))
{
certValidationCallback = (_, cert, chain, errors) => ValidateServerCertificate(connectionSettings, cert, chain, errors);
}
sslStream = new SslStream(client.GetStream(), true, certValidationCallback);
try
{
if (async)
{
await sslStream.AuthenticateAsClientAsync(new SslClientAuthenticationOptions { TargetHost = connectionSettings.Host }, cancellationToken);
}
else
{
sslStream.AuthenticateAsClient(connectionSettings.Host);
}
}
catch (AuthenticationException authEx)
{
throw new ClickHouseException(ClickHouseErrorCodes.TlsError, $"TLS handshake error.", authEx);
}
}
var stream = sslStream ?? (Stream)client.GetStream();
writer = new ClickHouseBinaryProtocolWriter(stream, Math.Max(connectionSettings.BufferSize, MinBufferSize));
var clientHello = new ClientHelloMessage.Builder
{
ClientName = connectionSettings.ClientName,
ClientVersion = connectionSettings.ClientVersion,
User = connectionSettings.User,
Database = connectionSettings.Database,
Password = connectionSettings.Password,
ProtocolRevision = ClickHouseProtocolRevisions.CurrentRevision
}.Build();
clientHello.Write(writer);
await writer.Flush(async, cancellationToken);
reader = new ClickHouseBinaryProtocolReader(stream, Math.Max(connectionSettings.BufferSize, MinBufferSize));
var message = await reader.ReadMessage(false, async, cancellationToken);
switch (message.MessageCode)
{
case ServerMessageCode.Hello:
var helloMessage = (ServerHelloMessage)message;
bool hasExtraByte = reader.TryPeekByte(out var extraByte);
if (!hasExtraByte && client.Available > 0)
{
hasExtraByte = true;
extraByte = await reader.ReadByte(async, cancellationToken);
}
if (hasExtraByte)
{
throw new ClickHouseException(ClickHouseErrorCodes.ProtocolUnexpectedResponse, $"Expected the end of the data. Unexpected byte (0x{extraByte:X}) received from the server.");
}
var serverInfo = helloMessage.ServerInfo;
var configuredTypeInfoProvider = (_typeInfoProvider ?? DefaultTypeInfoProvider.Instance).Configure(serverInfo);
var tcpClient = new ClickHouseTcpClient(client, reader, writer, connectionSettings, serverInfo, configuredTypeInfoProvider, sslStream);
if (!TryChangeConnectionState(connectionState, ConnectionState.Open, tcpClient, out _, out onStateChanged))
{
throw new ClickHouseException(ClickHouseErrorCodes.InvalidConnectionState, "The state of the connection was modified.");
}
break;
case ServerMessageCode.Error:
throw ((ServerErrorMessage)message).Exception;
default:
if ((int)message.MessageCode == 'H')
{
// It looks like HTTP
string httpDetectedMessage;
if (connectionSettings.Port == defaultHttpPort)
{
// It's definitely HTTP
httpDetectedMessage = $"Detected an attempt to connect by HTTP protocol with the default port {defaultHttpPort}. ";
}
else
{
httpDetectedMessage =
$"Internal error. Unexpected message code (0x{message.MessageCode:X}) received from the server. " +
"This error may by caused by an attempt to connect with HTTP protocol. ";
}
httpDetectedMessage +=
$"{ClickHouseConnectionStringBuilder.DefaultClientName} supports only ClickHouse native protocol. " +
$"The default port for the native protocol is {ClickHouseConnectionStringBuilder.DefaultPort}.";
throw new ClickHouseException(ClickHouseErrorCodes.ProtocolUnexpectedResponse, httpDetectedMessage);
}
if ((int)message.MessageCode == 0x15)
{
// 0x15 stands for TLS alert message
var sslAlertMessage =
$"Unexpected message code (0x{message.MessageCode:X}) received from the server. " +
"This code may indicate that the server requires establishing a connection over TLS.";
throw new ClickHouseException(ClickHouseErrorCodes.ProtocolUnexpectedResponse, sslAlertMessage);
}
throw new ClickHouseException(ClickHouseErrorCodes.ProtocolUnexpectedResponse, $"Internal error. Unexpected message code (0x{message.MessageCode:X}) received from the server.");
}
}
catch (Exception ex)
{
reader?.Dispose();
writer?.Dispose();
sslStream?.Dispose();
client?.Client?.Close(0);
client?.Dispose();
if (TryChangeConnectionState(connectionState, ConnectionState.Closed, out _, out onStateChanged))
{
stateChangeEx = onStateChanged(this);
}
if (connectionSettings.Port == defaultHttpPort && ex is IOException)
{
var extraMessage =
$"{ex.Message} This error may be caused by an attempt to connect to the default HTTP port ({defaultHttpPort}). " +
$"{ClickHouseConnectionStringBuilder.DefaultClientName} supports only ClickHouse native protocol. " +
$"The default port for the native protocol is {ClickHouseConnectionStringBuilder.DefaultPort}.";
var extraEx = new IOException(extraMessage, ex);
if (stateChangeEx != null)
{
throw new AggregateException(extraEx, stateChangeEx);
}
throw extraEx;
}
if (stateChangeEx != null)
{
throw new AggregateException(ex, stateChangeEx);
}
throw;
}
stateChangeEx = onStateChanged.Invoke(this);
if (stateChangeEx != null)
{
throw new ClickHouseException(ClickHouseErrorCodes.CallbackError, "External callback error. See the inner exception for details.", stateChangeEx);
}
}
public Session(ClickHouseTcpClient client, CancellationToken sessionCancellationToken)
{
_client = client;
_sessionCancellationToken = sessionCancellationToken;
}
public Session(ClickHouseTcpClient client, IClickHouseSessionExternalResources?externalResources, CancellationToken sessionCancellationToken)
{
_client = client;
_externalResources = externalResources;
_sessionCancellationToken = sessionCancellationToken;
}