/// <summary>Handles an exception when processing a batch response.</summary>
/// <param name='service'>Data service doing the processing.</param>
/// <param name="requestMessage">requestMessage holding information about the request that caused an error</param>
/// <param name="responseMessage">responseMessage to which we need to write the exception message</param>
/// <param name='exception'>Exception thrown.</param>
/// <param name='batchWriter'>Output writer for the batch.</param>
/// <param name="responseStream">Underlying response stream.</param>
/// <param name="defaultResponseVersion">The data service version to use for response, if it cannot be computed from the requestMessage.</param>
internal static void HandleBatchOperationError(IDataService service, AstoriaRequestMessage requestMessage, IODataResponseMessage responseMessage, Exception exception, ODataBatchWriter batchWriter, Stream responseStream, Version defaultResponseVersion)
{
Debug.Assert(service != null, "service != null");
Debug.Assert(exception != null, "exception != null");
Debug.Assert(batchWriter != null, "batchWriter != null");
Debug.Assert(service.Configuration != null, "service.Configuration != null");
Debug.Assert(CommonUtil.IsCatchableExceptionType(exception), "CommonUtil.IsCatchableExceptionType(exception)");
ErrorHandler handler = CreateHandler(service, requestMessage, exception, defaultResponseVersion);
service.InternalHandleException(handler.exceptionArgs);
if (requestMessage != null && responseMessage != null)
{
responseMessage.SetHeader(XmlConstants.HttpODataVersion, handler.responseVersion.ToString(2) + ";");
requestMessage.ProcessException(handler.exceptionArgs);
// if ProcessBenignException returns anything, we can safely not write to the stream.
if (ProcessBenignException(exception, service) != null)
{
return;
}
}
if (requestMessage != null)
{
responseMessage = requestMessage.BatchServiceHost.GetOperationResponseMessage();
WebUtil.SetResponseHeadersForBatchRequests(responseMessage, requestMessage.BatchServiceHost);
}
else
{
responseMessage = batchWriter.CreateOperationResponseMessage(null);
responseMessage.StatusCode = handler.exceptionArgs.ResponseStatusCode;
}
MessageWriterBuilder messageWriterBuilder = MessageWriterBuilder.ForError(
null,
service,
handler.responseVersion,
responseMessage,
handler.contentType,
null /*acceptCharsetHeaderValue*/);
using (ODataMessageWriter messageWriter = messageWriterBuilder.CreateWriter())
{
ODataError error = handler.exceptionArgs.CreateODataError();
WriteErrorWithFallbackForXml(messageWriter, handler.encoding, responseStream, handler.exceptionArgs, error, messageWriterBuilder);
}
}
/// <summary>Handles an exception before the response has been written out.</summary>
/// <param name='exception'>Exception thrown.</param>
/// <param name='service'>Data service doing the processing.</param>
/// <returns>An action that can serialize the exception into a stream.</returns>
internal static Action <Stream> HandleBeforeWritingException(Exception exception, IDataService service)
{
Debug.Assert(CommonUtil.IsCatchableExceptionType(exception), "CommonUtil.IsCatchableExceptionType(exception)");
Debug.Assert(exception != null, "exception != null");
Debug.Assert(service != null, "service != null");
AstoriaRequestMessage requestMessage = service.OperationContext.RequestMessage;
Debug.Assert(requestMessage != null, "requestMessage != null");
ErrorHandler handler = CreateHandler(service, requestMessage, exception, VersionUtil.DataServiceDefaultResponseVersion);
service.InternalHandleException(handler.exceptionArgs);
service.OperationContext.ResponseMessage.SetHeader(XmlConstants.HttpODataVersion, handler.responseVersion.ToString(2) + ";");
requestMessage.ProcessException(handler.exceptionArgs);
Action <Stream> action = ProcessBenignException(exception, service);
if (action != null)
{
return(action);
}
MessageWriterBuilder messageWriterBuilder = MessageWriterBuilder.ForError(
service.OperationContext.RequestMessage.AbsoluteServiceUri,
service,
handler.responseVersion,
service.OperationContext.ResponseMessage,
handler.contentType,
service.OperationContext.RequestMessage.GetRequestAcceptCharsetHeader());
ODataMessageWriter messageWriter = messageWriterBuilder.CreateWriter();
ODataUtils.SetHeadersForPayload(messageWriter, ODataPayloadKind.Error);
return(stream =>
{
service.OperationContext.ResponseMessage.SetStream(stream);
ODataError error = handler.exceptionArgs.CreateODataError();
WriteErrorWithFallbackForXml(messageWriter, handler.encoding, stream, handler.exceptionArgs, error, messageWriterBuilder);
});
}
