public static async Task <List <Command> > DeserializeAsync(Stream stream)
{
Memory <byte> buffer = new byte[8192];
int bytesRead;
var protocolObjectBuffer = new MessageProtocolObject[1024];
Memory <MessageProtocolObject> protocolObjects = protocolObjectBuffer;
var parserIndex = 0;
Memory <byte> remainingBuffer = new byte[0];
while ((bytesRead = await stream.ReadAsync(buffer).ConfigureAwait(false)) > 0)
{
var(currentParserIndex, remeaningBufferLength) = ParseProtocolObjects(remainingBuffer.Span, buffer.Span.Slice(0, bytesRead),
protocolObjects.Slice(parserIndex),
() =>
{
Array.Resize(ref protocolObjectBuffer, protocolObjectBuffer.Length + 1024);
protocolObjects = protocolObjectBuffer;
});
parserIndex += currentParserIndex;
remainingBuffer = buffer.Slice(bytesRead - remeaningBufferLength, remeaningBufferLength);
}
return(ParseCommands(protocolObjects.Slice(0, parserIndex)));
}
private MessageProtocolObject ReadProtocolObject(byte firstByte)
{
var commandStartPosition = _currentPosition - 1;
switch (firstByte)
{
#region Simple String
case (byte)TokenType.String:
{
if (!ReadUntil(new[] { (byte)TokenType.Separator }, out var bytes))
{
//EOB
_currentPosition = commandStartPosition;
return(null);
}
return(new StringProtocolObject()
{
Value = Encoding.UTF8.GetString(bytes)
});
}
#endregion
#region Blob
case (byte)TokenType.Blob:
{
if (!ReadInteger(out var length))
{
//EOB
_currentPosition = commandStartPosition;
return(null);
}
if (!ExpectSeparator())
{
//EOB
_currentPosition = commandStartPosition;
return(null);
}
if (!ReadBytes(length, out var bytes))
{
//EOB
_currentPosition = commandStartPosition;
return(null);
}
if (!ExpectSeparator())
{
//EOB
_currentPosition = commandStartPosition;
return(null);
}
return(new BlobProtocolObject()
{
Bytes = bytes.ToArray()
});
}
#endregion
#region Error
case (byte)TokenType.Error:
{
if (!ReadInteger(out var length))
{
//EOB
_currentPosition = commandStartPosition;
return(null);
}
if (!ExpectSeparator())
{
//EOB
_currentPosition = commandStartPosition;
return(null);
}
if (!ReadAsciiString(8, out var errorCode))
{
//EOB
_currentPosition = commandStartPosition;
return(null);
}
if (!ExpectSeparator())
{
//EOB
_currentPosition = commandStartPosition;
return(null);
}
if (!ReadUtf8String(length, out var errorMessage))
{
//EOB
_currentPosition = commandStartPosition;
return(null);
}
if (!ExpectSeparator())
{
//EOB
_currentPosition = commandStartPosition;
return(null);
}
return(new ErrorProtocolObject()
{
Code = errorCode,
Message = errorMessage
});
}
#endregion
#region Integer
case (byte)TokenType.Integer:
{
if (!ReadInteger(out var value))
{
//EOB
_currentPosition = commandStartPosition;
return(null);
}
if (!ExpectSeparator())
{
//EOB
_currentPosition = commandStartPosition;
return(null);
}
return(new IntegerProtocolObject()
{
Value = value
});
}
#endregion
#region Long
case (byte)TokenType.Long:
{
if (!ReadLong(out var value))
{
//EOB
_currentPosition = commandStartPosition;
return(null);
}
if (!ExpectSeparator())
{
//EOB
_currentPosition = commandStartPosition;
return(null);
}
return(new LongProtocolObject()
{
Value = value
});
}
#endregion
#region Double
case (byte)TokenType.Double:
{
if (!ReadDouble(out var value))
{
//EOB
_currentPosition = commandStartPosition;
return(null);
}
if (!ExpectSeparator())
{
//EOB
_currentPosition = commandStartPosition;
return(null);
}
return(new DoubleProtocolObject()
{
Value = value
});
}
#endregion
#region Null
case (byte)TokenType.Null:
{
if (!ExpectSeparator())
{
//EOB
_currentPosition = commandStartPosition;
return(null);
}
return(new NullProtocolObject());
}
#endregion
#region Boolean
case (byte)TokenType.True:
{
if (!ExpectSeparator())
{
//EOB
_currentPosition = commandStartPosition;
return(null);
}
return(new BooleanProtocolObject
{
Value = true
});
}
case (byte)TokenType.False:
{
if (!ExpectSeparator())
{
//EOB
_currentPosition = commandStartPosition;
return(null);
}
return(new BooleanProtocolObject
{
Value = false
});
}
#endregion
#region Array
case (byte)TokenType.Array:
{
if (!ReadInteger(out var count))
{
//EOB
_currentPosition = commandStartPosition;
return(null);
}
if (!ExpectSeparator())
{
//EOB
_currentPosition = commandStartPosition;
return(null);
}
var items = new MessageProtocolObject[count];
for (var i = 0; i < count; i++)
{
if (!ReadNextByte(out var arrayItemFirstByte))
{
//EOB
_currentPosition = commandStartPosition;
return(null);
}
var item = ReadProtocolObject(arrayItemFirstByte);
if (item == null)
{
//EOB
_currentPosition = commandStartPosition;
return(null);
}
items[i] = item;
}
return(new ArrayProtocolObject
{
Items = items
});
}
#endregion
#region Map
case (byte)TokenType.Map:
{
if (!ReadInteger(out var count))
{
//EOB
_currentPosition = commandStartPosition;
return(null);
}
if (!ExpectSeparator())
{
//EOB
_currentPosition = commandStartPosition;
return(null);
}
var items = new KeyValuePair <MessageProtocolObject, MessageProtocolObject> [count];
for (var i = 0; i < count; i++)
{
if (!ReadNextByte(out var keyFirstByte))
{
//EOB
_currentPosition = commandStartPosition;
return(null);
}
var key = ReadProtocolObject(keyFirstByte);
if (key == null)
{
//EOB
_currentPosition = commandStartPosition;
return(null);
}
if (!ReadNextByte(out var valueFirstByte))
{
//EOB
_currentPosition = commandStartPosition;
return(null);
}
var value = ReadProtocolObject(valueFirstByte);
if (value == null)
{
//EOB
_currentPosition = commandStartPosition;
return(null);
}
items[i] = new KeyValuePair <MessageProtocolObject, MessageProtocolObject>(key, value);
}
return(new MapProtocolObject
{
Items = items
});
}
#endregion
default:
throw new SyntaxErrorException($"Invalid start character #{firstByte} at {{0}}.", _currentPosition);
}
}
/// <summary> /// Handles the writing of <see cref="MessageProtocolObject"/> /// </summary> /// <param name="protocolObject"></param> protected abstract void HandleWrite(MessageProtocolObject protocolObject);
/// <inheritdoc />
public virtual void Write(MessageProtocolObject protocolObject)
{
HandleWrite(protocolObject);
}
/// <inheritdoc />
protected override void HandleWrite(MessageProtocolObject protocolObject)
{
_items.Add(protocolObject);
}