private SednaSession(string dbname, string host, int port, string userName, string password)
{
currentDatabase = dbname;
try
{
socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
socket.Connect(new IPEndPoint(Dns.GetHostEntry(host).AddressList[0], port));
}
catch (IOException ex)
{
throw new SednaException("No connection could be made to that host: " + ex.Message);
}
outputStream = new NetworkStream(socket, FileAccess.Write);
inputStream = new NetworkStream(socket, FileAccess.Read);
// send startup message.
NetworkOperations.WriteMessage(InstructionCode.StartUp, outputStream, inputStream, InstructionCode.SendSessionParameters);
// send parameters.
NetworkOperations.Message msg = CreateParametersMessage(dbname, userName, password);
NetworkOperations.WriteMessage(msg, outputStream);
// get the response...
NetworkOperations.ReadMessage(msg, inputStream);
// need to send the password
if (msg.Instruction == InstructionCode.SendAuthenticationParameters)
{
NetworkOperations.WriteMessage(InstructionCode.AuthenticationResponse, outputStream, inputStream, new string[] { password }, InstructionCode.AuthenticationOK);
}
else if (msg.Instruction == InstructionCode.AuthenticationFailed || msg.Instruction == InstructionCode.GeneralError)
{
throw new SednaException("Authentication failed");
}
}
internal QueryResult(NetworkOperations.StringItem item, NetworkStream inputStream, NetworkStream outputStream)
{
this.inputStream = inputStream;
this.outputStream = outputStream;
text = item.Item;
hasNextItem = item.HasNextItem;
}
/// <summary>
/// Terminates a session, rolling back any transactions that were not committed.
/// </summary>
public void Close()
{
// for reason the server rejects this message.
NetworkOperations.WriteMessage(InstructionCode.CloseConnection, outputStream, inputStream, InstructionCode.ConnectionClosed, InstructionCode.TransactionRollback);
inputStream.Close();
outputStream.Close();
isClosed = true;
}
/// <summary>
/// Writes out a string (or series of strings) in sedna format.
/// </summary>
public static void WriteString(BinaryWriter writer, params string[] textItems)
{
foreach (string text in textItems)
{
writer.Write((byte)0);
NetworkOperations.WriteInt(text.Length, int_array, 0);
writer.Write(int_array);
writer.Write(Encoding.ASCII.GetBytes(text));
}
}
public static void WriteMessage(Message msg, NetworkStream outputStream)
{
if (msg.Body.Length > SocketMessageBufferSize)
{
throw new IndexOutOfRangeException("Size of packet exceeds maximum buffer size");
}
NetworkOperations.WriteInt((int)msg.Instruction, outputStream);
NetworkOperations.WriteInt((int)msg.Body.Length, outputStream);
outputStream.Write(msg.Body, 0, msg.Body.Length);
outputStream.Flush();
}
public static void ReadMessage(Message msg, NetworkStream bufInputStream)
{
msg.Instruction = (InstructionCode)NetworkOperations.ReadInt(bufInputStream);
int len = NetworkOperations.ReadInt(bufInputStream);
msg.Body = new byte[len];
if (len != 0)
{
ReadWithTimeout(bufInputStream, msg.Body, 0, len);
}
}
private NetworkOperations.Message CreateParametersMessage(string dbname, string userName, string password)
{
NetworkOperations.Message msg = new NetworkOperations.Message();
MemoryStream stream = new MemoryStream();
BinaryWriter writer = new BinaryWriter(stream);
msg.Instruction = InstructionCode.Login;
writer.Write((byte)1); // protocol version... 1.0
writer.Write((byte)0);
NetworkOperations.WriteString(writer, userName, dbname);
writer.Close();
msg.Body = stream.ToArray();
return(msg);
}
public static bool BulkLoad(Stream input, NetworkStream bufInputStream, NetworkStream outputStream)
{
Message msg = new Message();
int bytes_read = -1;
try
{
while (bytes_read != 0)
{
byte[] buffer = new byte[BulkLoadPortionSize];
bytes_read = input.Read(buffer, 0, BulkLoadPortionSize);
if (bytes_read != 0)
{
// crop the array to the correct size
msg.Body = new byte[bytes_read + IntSize + StringTypeSize];
Array.Copy(buffer, 0, msg.Body, IntSize + StringTypeSize, bytes_read);
msg.Instruction = InstructionCode.BulkLoadPortion;
msg.Body[0] = 0;
NetworkOperations.WriteInt(bytes_read, msg.Body, 0 + StringTypeSize);
NetworkOperations.WriteMessage(msg, outputStream);
}
}
NetworkOperations.WriteMessage(InstructionCode.BulkLoadEnd, outputStream, bufInputStream, InstructionCode.BulkLoadSucceeded, InstructionCode.UpdateSucceeded);
return(true);
}
catch (IOException e)
{
msg.Instruction = InstructionCode.BulkLoadError;
try
{
NetworkOperations.WriteMessage(msg, outputStream);
NetworkOperations.ReadMessage(msg, bufInputStream);
}
catch (IOException ex)
{
throw new SednaException(InstructionCode.BulkLoadFailed, "Unable to bulk load: IO error: " + ex.Message);
}
throw new SednaException(InstructionCode.BulkLoadFailed, NetworkOperations.GetErrorInfo(msg.Instruction, msg.Body) + " : " + e.Message);
}
}
public static StringItem ReadStringItem(NetworkStream inputStream)
{
Message msg = new Message();
StringItem sitem = new StringItem();
StringBuilder strBuf = new StringBuilder();
NetworkOperations.ReadMessage(msg, inputStream);
if ((msg.Instruction == InstructionCode.ItemEnd) || (msg.Instruction == InstructionCode.ResultEnd))
{
sitem.HasNextItem = false;
sitem.Item = null;
return(sitem);
}
while ((msg.Instruction != InstructionCode.ItemEnd) && (msg.Instruction != InstructionCode.ResultEnd))
{
if (msg.Instruction == InstructionCode.GeneralError)
{
throw NetworkOperations.GetErrorInfo(msg.Instruction, msg.Body);
}
if (msg.Instruction == InstructionCode.ItemPart)
{
strBuf.Append(Encoding.ASCII.GetString(msg.Body, (IntSize + StringTypeSize), msg.Body.Length - (IntSize + StringTypeSize)));
}
NetworkOperations.ReadMessage(msg, inputStream);
}
if (msg.Instruction == InstructionCode.ResultEnd)
{
sitem.HasNextItem = false;
}
else if (msg.Instruction == InstructionCode.ItemEnd)
{
sitem.HasNextItem = true;
}
sitem.Item = strBuf.ToString();
return(sitem);
}
/// <summary>
/// Retrieves the next part of the result.
/// </summary>
/// <returns></returns>
public string Next()
{
if (!hasNextItem)
{
return(null);
}
NetworkOperations.Message msg = new NetworkOperations.Message();
msg.Instruction = InstructionCode.GetNextItem;
NetworkOperations.WriteMessage(msg, outputStream);
NetworkOperations.StringItem item = NetworkOperations.ReadStringItem(inputStream);
if (item.Item == null)
{
hasNextItem = false;
return(null);
}
else
{
text += item.Item;
return(item.Item);
}
}
/// <summary>
/// Executes a query that is read from a stream.
/// </summary>
public QueryResult Execute(TextReader queryReader)
{
try
{
if (!inTransaction)
{
BeginTransaction();
}
string query = queryReader.ReadToEnd();
NetworkOperations.Message msg = new NetworkOperations.Message();
msg.Instruction = InstructionCode.Execute;
MemoryStream stream = new MemoryStream();
BinaryWriter writer = new BinaryWriter(stream);
writer.Write((byte)0); // xml is 0, scheme xml is 1
NetworkOperations.WriteString(writer, query);
writer.Close();
msg.Body = stream.ToArray();
NetworkOperations.WriteMessage(msg, outputStream);
NetworkOperations.ReadMessage(msg, inputStream);
if (msg.Instruction == InstructionCode.QuerySucceeded)
{
return(new QueryResult(NetworkOperations.ReadStringItem(inputStream), inputStream, outputStream));
}
else if (msg.Instruction == InstructionCode.QueryFailed || msg.Instruction == InstructionCode.UpdateFailed || msg.Instruction == InstructionCode.GeneralError)
{
throw NetworkOperations.GetErrorInfo(msg.Instruction, msg.Body);
}
else if (msg.Instruction == InstructionCode.UpdateSucceeded)
{
haveUpdated = true;
return(null);
}
else if (msg.Instruction == InstructionCode.BulkLoadFileRequest)
{
try
{
haveUpdated = true;
string filename = NetworkOperations.ReadString(msg, 0);
Stream fileStream = File.OpenRead(filename);
if (!NetworkOperations.BulkLoad(fileStream, inputStream, outputStream))
{
throw new SednaException(InstructionCode.BulkLoadFailed, "Bulk load failed");
}
return(null);
}
finally
{
stream.Close();
}
}
else if (msg.Instruction == InstructionCode.BulkLoadStreamRequest)
{
if (!NetworkOperations.BulkLoad(Console.OpenStandardInput(), inputStream, outputStream))
{
throw new SednaException("Bulk load failed");
}
return(null);
}
else
{
throw new SednaException("Unexpected error");
}
}
catch (Exception ex)
{
inTransaction = false;
haveUpdated = false;
throw ex;
}
}
/// <summary>
/// Commits the current transaction
/// </summary>
public void CommitTransaction()
{
inTransaction = false;
haveUpdated = false;
NetworkOperations.WriteMessage(InstructionCode.CommitTransaction, outputStream, inputStream, InstructionCode.CommitSucceeded);
}
public void RollbackTransaction()
{
inTransaction = false;
haveUpdated = false;
NetworkOperations.WriteMessage(InstructionCode.RollbackTransaction, outputStream, inputStream, InstructionCode.TransactionRollback);
}
/// <summary>
/// Begins a new transaction manually
/// </summary>
public void BeginTransaction()
{
NetworkOperations.WriteMessage(InstructionCode.BeginTransaction, outputStream, inputStream, InstructionCode.BeginTransactionOk);
inTransaction = true;
haveUpdated = false;
}
