/// <summary>
/// Decode messages from a payload and assign it a given kafka offset.
/// </summary>
/// <param name="offset">The offset represting the log entry from kafka of this message.</param>
/// <param name="payload">The byte[] encode as a message from kafka.</param>
/// <returns>The message</returns>
/// <remarks>The return type is an Enumerable as the message could be a compressed message set.</remarks>
internal static Message DecodeMessage(long offset, int partitionId, KafkaDecoder decoder, int messageSize)
{
var crc = decoder.ReadUInt32();
var calculatedCrc = Crc32Provider.Compute(decoder.Buffer, decoder.Offset, messageSize - 4);
if (calculatedCrc != crc)
{
throw new FailCrcCheckException("Payload did not match CRC validation.");
}
var message = new Message
{
Meta = new MessageMetadata(offset, partitionId),
MagicNumber = decoder.ReadByte(),
Attribute = decoder.ReadByte(),
Key = decoder.ReadBytes(),
};
var codec = (MessageCodec)(ProtocolConstants.AttributeCodeMask & message.Attribute);
switch (codec)
{
case MessageCodec.CodecNone:
message.Value = decoder.ReadBytes();
break;
default:
throw new NotSupportedException(string.Format("Codec type of {0} is not supported.", codec));
}
return(message);
}
/// <summary>
/// Decode messages from a payload and assign it a given kafka offset.
/// </summary>
/// <param name="offset">The offset represting the log entry from kafka of this message.</param>
/// <param name="payload">The byte[] encode as a message from kafka.</param>
/// <returns>The message</returns>
/// <remarks>The return type is an Enumerable as the message could be a compressed message set.</remarks>
internal static Message DecodeMessage(long offset, int partitionId, KafkaDecoder decoder, int messageSize)
{
var crc = decoder.ReadUInt32();
var calculatedCrc = Crc32Provider.Compute(decoder.Buffer, decoder.Offset, messageSize - 4);
if (calculatedCrc != crc)
{
throw new FailCrcCheckException("Payload did not match CRC validation.");
}
var message = new Message
{
Meta = new MessageMetadata(offset, partitionId),
MagicNumber = decoder.ReadByte(),
Attribute = decoder.ReadByte(),
Key = decoder.ReadBytes(),
};
var codec = (MessageCodec)(ProtocolConstants.AttributeCodeMask & message.Attribute);
switch (codec)
{
case MessageCodec.CodecNone:
message.Value = decoder.ReadBytes();
break;
default:
throw new NotSupportedException(string.Format("Codec type of {0} is not supported.", codec));
}
return message;
}
