/// <summary>
/// Applies the specified value.
/// </summary>
/// <param name="value">The value.</param>
private void applyString(byte[] value)
{
if (operations.Count == 0)
{
receivedData.Enqueue(value);
return;
}
object nextOp = operations.Peek();
if (nextOp is AwaitString && !((AwaitString)nextOp).readSize)
{
AwaitString op = (AwaitString)nextOp;
int size = Convert.ToInt32(Encoding.ASCII.GetString(value));
op.readSize = true;
op.size = size;
op.data = new byte[] {};
if (op.size < 0)
{
operations.Pop();
applyString(null);
}
}
else if (nextOp is AwaitList && !((AwaitList)nextOp).readLength)
{
AwaitList op = (AwaitList)nextOp;
int length = Convert.ToInt32(Encoding.ASCII.GetString(value));
op.readLength = true;
op.length = length;
if (op.length < 0)
{
operations.Pop();
applyString(null);
}
op.data = new object[length];
}
else
{
if (!applyToList(value))
{
receivedData.Enqueue(value);
operations.Push(new AwaitCrLf());
}
}
}
/// <summary>
/// Updates the internal states based on the latest bytes read.
/// </summary>
/// <param name="bytesRead">The number of bytes read.</param>
/// <exception cref="System.NotImplementedException">
/// Operation not implemented for + encoding.GetString(buffer, bufferIndex, 1)
/// or
/// Don't know what to do.
/// </exception>
/// <exception cref="System.InvalidOperationException">
/// Protocol Violation. Expected CR-LF.
/// or
/// Protocol Violation. Expected CR.
/// or
/// Protocol Violation. Expected LF.
/// </exception>
public void update(int bytesRead)
{
int bufferIndex = 0;
while (bufferIndex < buffer.Length && bufferIndex < bytesRead)
{
if (operations.Count == 0)
{
operations.Push(new AwaitCommand());
}
object nextOp = operations.Peek();
if (nextOp is AwaitCommand)
{
switch (buffer[bufferIndex])
{
case PLUS:
operations.Pop();
operations.Push(new AwaitSimpleString());
++bufferIndex;
continue;
case DOLLAR:
operations.Pop();
operations.Push(new AwaitString {
readSize = false
});
operations.Push(new AwaitSimpleString());
++bufferIndex;
continue;
case COLON:
operations.Pop();
operations.Push(new AwaitInt());
++bufferIndex;
continue;
case ASTERISK:
operations.Pop();
operations.Push(new AwaitList {
readLength = false
});
operations.Push(new AwaitSimpleString());
++bufferIndex;
continue;
case MINUS:
operations.Pop();
operations.Push(new AwaitError());
operations.Push(new AwaitSimpleString());
++bufferIndex;
continue;
default:
throw new NotImplementedException("Operation not implemented for " + encoding.GetString(buffer, bufferIndex, 1));
}
}
else if (nextOp is AwaitCrLf)
{
AwaitCrLf op = (AwaitCrLf)nextOp;
int availableLength = buffer.Length - bufferIndex;
if (availableLength < 1)
{
continue;
}
if (!op.cr)
{
if (availableLength >= 2)
{
if (buffer[bufferIndex] == CR && buffer[bufferIndex + 1] == LF)
{
operations.Pop();
bufferIndex += 2;
}
else
{
throw new InvalidOperationException("Protocol Violation. Expected CR-LF.");
}
}
else
{
if (buffer[bufferIndex] == CR)
{
op.cr = true;
++bufferIndex;
}
else
{
throw new InvalidOperationException("Protocol Violation. Expected CR.");
}
}
}
else
{
if (buffer[bufferIndex] == LF)
{
operations.Pop();
++bufferIndex;
}
else
{
throw new InvalidOperationException("Protocol Violation. Expected LF.");
}
}
}
else if (nextOp is AwaitSimpleString)
{
AwaitSimpleString op = (AwaitSimpleString)nextOp;
IEnumerable <byte> partialBuffer = buffer.Skip(bufferIndex).Take(bytesRead - bufferIndex);
byte[] potential = op.data == null?partialBuffer.ToArray() : op.data.Concat(partialBuffer).ToArray();
int indexCrLf = potential.indexOf(CrLf);
if (indexCrLf == -1)
{
op.data = potential;
bufferIndex = buffer.Length;
}
else
{
byte[] stringData = potential.Take(indexCrLf).ToArray();
operations.Pop();
if (operations.Count > 0 && operations.Peek() is AwaitError)
{
operations.Pop();
apply(new RedisErrorException(encoding.GetString(stringData)));
}
else
{
applyString(stringData);
}
bufferIndex += indexCrLf + CrLf.Length - (op.data == null ? 0 : op.data.Length);
}
}
else if (nextOp is AwaitInt)
{
AwaitInt op = (AwaitInt)nextOp;
IEnumerable <byte> partialBuffer = buffer.Skip(bufferIndex).Take(bytesRead - bufferIndex);
byte[] potential = op.data == null?partialBuffer.ToArray() : op.data.Concat(partialBuffer).ToArray();
int indexCrLf = potential.indexOf(CrLf);
if (indexCrLf == -1)
{
op.data = potential;
bufferIndex = buffer.Length;
}
else
{
byte[] stringData = potential.Take(indexCrLf).ToArray();
string valueLiteral = _encoding.GetString(stringData);
operations.Pop();
long value;
if (long.TryParse(valueLiteral, out value))
{
apply(value);
}
else
{
apply(new Exception(string.Format("Failed to parse {0} as an integer", valueLiteral)));
}
bufferIndex += indexCrLf + CrLf.Length - (op.data == null ? 0 : op.data.Length);
}
}
else if (nextOp is AwaitString)
{
AwaitString op = (AwaitString)nextOp;
int currentSize = op.data.Length;
int availableLength = buffer.Length - bufferIndex;
if (currentSize + availableLength >= op.size)
{
int count = op.size - op.data.Length;
byte[] stringData = op.data.Concat(buffer.Skip(bufferIndex).Take(count)).ToArray();
operations.Pop();
applyString(stringData);
bufferIndex = bufferIndex + count;
operations.Push(new AwaitCrLf());
continue;
}
else
{
op.data = op.data.Concat(buffer.Skip(bufferIndex).Take(availableLength)).ToArray();
bufferIndex = bufferIndex + availableLength;
}
}
else if (nextOp is AwaitList)
{
AwaitList op = (AwaitList)nextOp;
if (op.objectsRead < op.length)
{
operations.Push(new AwaitCommand());
}
}
else
{
throw new NotImplementedException("Don't know what to do.");
}
nextOp = operations.Count > 0 ? operations.Peek() : null;
while (nextOp is AwaitList && ((AwaitList)nextOp).objectsRead >= ((AwaitList)nextOp).length)
{
operations.Pop();
apply(((AwaitList)nextOp).data);
nextOp = operations.Count > 0 ? operations.Peek() : null;
}
if (operations.Count == 0)
{
// Opportunity here to convert from "internal" state to "external" state.
Queue receivedObject = new Queue(receivedData.Count);
while (receivedData.Count > 0)
{
receivedObject.Enqueue(receivedData.Dequeue());
}
_onObjectReceived(new ObjectReceivedEventArgs(receivedObject));
}
}
}
