/// <summary>
/// Decode a byte[] that represents a collection of messages.
/// </summary>
/// <param name="reader">The reader</param>
/// <param name="partitionId">The partitionId messages are being read from.</param>
/// <returns>Enumerable representing stream of messages decoded from byte[]</returns>
public static IImmutableList <Message> ReadMessages(this IKafkaReader reader, int partitionId = 0)
{
var expectedLength = reader.ReadInt32();
if (!reader.Available(expectedLength))
{
throw new BufferUnderRunException($"Message set size of {expectedLength} is not fully available.");
}
var messages = ImmutableList <Message> .Empty;
var finalPosition = reader.Position + expectedLength;
while (reader.Position < finalPosition)
{
// this checks that we have at least the minimum amount of data to retrieve a header
if (reader.Available(MessageHeaderSize) == false)
{
break;
}
var offset = reader.ReadInt64();
var messageSize = reader.ReadInt32();
// if the stream does not have enough left in the payload, we got only a partial message
if (reader.Available(messageSize) == false)
{
throw new BufferUnderRunException($"Message header size of {MessageHeaderSize} is not fully available.");
}
try {
messages = messages.AddRange(reader.ReadMessage(messageSize, offset, partitionId));
} catch (EndOfStreamException ex) {
throw new BufferUnderRunException($"Message size of {messageSize} is not available.", ex);
}
}
return(messages);
}