private IMessage SerializeAndEmbedHeadersIfApplicable(IMessage message)
{
var transformed = new MessageValues(message);
object payload;
if (embedHeaders)
{
transformed.TryGetValue(MessageHeaders.CONTENT_TYPE, out var contentType);
// transform content type headers to String, so that they can be properly
// embedded in JSON
if (contentType != null)
{
transformed[MessageHeaders.CONTENT_TYPE] = contentType.ToString();
}
payload = EmbeddedHeaderUtils.EmbedHeaders(transformed, embeddedHeaders);
}
else
{
payload = transformed.Payload;
}
return(IntegrationServices.MessageBuilderFactory.WithPayload(payload).CopyHeaders(transformed.Headers).Build());
}
public static byte[] EmbedHeaders(MessageValues original, params string[] headers)
{
try
{
var headerValues = new byte[headers.Length][];
var n = 0;
var headerCount = 0;
var headersLength = 0;
foreach (var header in headers)
{
original.TryGetValue(header, out var value);
if (value != null)
{
var json = JsonConvert.SerializeObject(value);
headerValues[n] = Encoding.UTF8.GetBytes(json);
headerCount++;
headersLength += header.Length + headerValues[n++].Length;
}
else
{
headerValues[n++] = null;
}
}
// 0xff, n(1), [ [lenHdr(1), hdr, lenValue(4), value] ... ]
var byteBuffer = new MemoryStream();
byteBuffer.WriteByte((byte)0xff); // signal new format
byteBuffer.WriteByte((byte)headerCount);
for (var i = 0; i < headers.Length; i++)
{
if (headerValues[i] != null)
{
byteBuffer.WriteByte((byte)headers[i].Length);
var buffer = Encoding.UTF8.GetBytes(headers[i]);
byteBuffer.Write(buffer, 0, buffer.Length);
buffer = GetBigEndianBytes(headerValues[i].Length);
byteBuffer.Write(buffer, 0, buffer.Length);
byteBuffer.Write(headerValues[i], 0, headerValues[i].Length);
}
}
var payloadBuffer = (byte[])original.Payload;
byteBuffer.Write(payloadBuffer, 0, payloadBuffer.Length);
return(byteBuffer.ToArray());
}
catch (Exception)
{
// Log
throw;
}
}