/// <summary>
/// Decode a byte[] that represents a collection of messages.
/// </summary>
/// <param name="reader">The reader</param>
/// <param name="codec">The codec of the containing messageset, if any</param>
/// <returns>Enumerable representing stream of messages decoded from byte[]</returns>
public static IImmutableList <Message> ReadMessages(this IKafkaReader reader, MessageCodec codec = MessageCodec.None)
{
var expectedLength = reader.ReadInt32();
if (!reader.HasBytes(expectedLength))
{
throw new BufferUnderRunException($"Message set size of {expectedLength} is not fully available (codec {codec}).");
}
var messages = ImmutableList <Message> .Empty;
var finalPosition = reader.Position + expectedLength;
while (reader.Position < finalPosition)
{
// this checks that we have at least the minimum amount of data to retrieve a header
if (reader.HasBytes(MessageHeaderSize) == false)
{
break;
}
var offset = reader.ReadInt64();
var messageSize = reader.ReadInt32();
// if the stream does not have enough left in the payload, we got only a partial message
if (reader.HasBytes(messageSize) == false)
{
throw new BufferUnderRunException($"Message header size of {MessageHeaderSize} is not fully available (codec {codec}).");
}
try {
messages = messages.AddRange(reader.ReadMessage(messageSize, offset));
} catch (EndOfStreamException ex) {
throw new BufferUnderRunException($"Message size of {messageSize} is not available (codec {codec}).", ex);
}
}
return(messages);
}
/// <inheritdoc />
public IMemberAssignment DecodeAssignment(IKafkaReader reader)
{
var expectedLength = reader.ReadInt32();
if (!reader.HasBytes(expectedLength))
{
throw new BufferUnderRunException($"{ProtocolType} Assignment size of {expectedLength} is not fully available.");
}
if (expectedLength == 0)
{
return(null);
}
return(DecodeAssignment(reader, expectedLength));
}
/// <inheritdoc />
public IMemberMetadata DecodeMetadata(string assignmentStrategy, IKafkaReader reader)
{
var expectedLength = reader.ReadInt32();
if (!reader.HasBytes(expectedLength))
{
throw new BufferUnderRunException($"{ProtocolType} Metadata size of {expectedLength} is not fully available.");
}
if (expectedLength == 0)
{
return(null);
}
return(DecodeMetadata(assignmentStrategy, reader, expectedLength));
}