/// <inheritdoc/>
public override void WriteObject(object graph, Type type, ODataMessageWriter messageWriter, ODataSerializerContext writeContext)
{
if (graph == null)
{
throw Error.ArgumentNull("graph");
}
if (messageWriter == null)
{
throw Error.ArgumentNull("messageWriter");
}
ODataError oDataError = graph as ODataError;
if (oDataError == null)
{
HttpError httpError = graph as HttpError;
if (httpError == null)
{
string message = Error.Format(SRResources.ErrorTypeMustBeODataErrorOrHttpError, graph.GetType().FullName);
throw new SerializationException(message);
}
else
{
oDataError = httpError.CreateODataError();
}
}
bool includeDebugInformation = oDataError.InnerError != null;
messageWriter.WriteError(oDataError, includeDebugInformation);
}
/// <summary>
/// Writes an ODataError with the given custom instance annotation to the test stream.
/// </summary>
private void WriteError(params KeyValuePair <string, ODataValue>[] annotations)
{
var writerSettings = new ODataMessageWriterSettings {
DisableMessageStreamDisposal = true
};
writerSettings.SetContentType(ODataFormat.Json);
writerSettings.SetServiceDocumentUri(new Uri("http://example.com/"));
IODataResponseMessage messageToWrite = new InMemoryMessage {
StatusCode = 400, Stream = this.stream
};
var error = new ODataError();
var instanceAnnotations = new Collection <ODataInstanceAnnotation>();
error.SetInstanceAnnotations(instanceAnnotations);
foreach (var pair in annotations)
{
ODataInstanceAnnotation annotation = new ODataInstanceAnnotation(pair.Key, pair.Value);
instanceAnnotations.Add(annotation);
}
using (var writer = new ODataMessageWriter(messageToWrite, writerSettings, this.model))
{
writer.WriteError(error, false);
}
}
/// <inheritdoc/>
public override void WriteObject(object graph, Type type, ODataMessageWriter messageWriter, ODataSerializerContext writeContext)
{
if (graph == null)
{
throw Error.ArgumentNull("graph");
}
if (messageWriter == null)
{
throw Error.ArgumentNull("messageWriter");
}
ODataError oDataError = graph as ODataError;
if (oDataError == null)
{
HttpError httpError = graph as HttpError;
if (httpError == null)
{
string message = Error.Format(SRResources.ErrorTypeMustBeODataErrorOrHttpError, graph.GetType().FullName);
throw new SerializationException(message);
}
else
{
oDataError = httpError.CreateODataError();
}
}
bool includeDebugInformation = oDataError.InnerError != null;
messageWriter.WriteError(oDataError, includeDebugInformation);
}
/// <summary>
/// Writes the error with fallback logic for XML cases where the writer is in an error state and a new writer must be created.
/// </summary>
/// <param name="messageWriter">The message writer.</param>
/// <param name="encoding">The encoding to use for the error if we have to fallback.</param>
/// <param name="responseStream">The response stream to write to in the fallback case.</param>
/// <param name="args">The args for the error.</param>
/// <param name="error">The error to write.</param>
/// <param name="messageWriterBuilder">MessageWriterBuilder to use if a new ODataMessageWriter needs to be constructed.</param>
private static void WriteErrorWithFallbackForXml(ODataMessageWriter messageWriter, Encoding encoding, Stream responseStream, HandleExceptionArgs args, ODataError error, MessageWriterBuilder messageWriterBuilder)
{
Debug.Assert(args != null, "args != null");
#if DEBUG
Debug.Assert(args.ProcessExceptionWasCalled, "ProcessException was not called by the time we tried to serialze this error message with ODataLib.");
#endif
if (messageWriter != null)
{
try
{
// If the XmlWriter inside the ODataMessageWriter had entered Error state, ODataMessageWriter.WriteError would throw an InvalidOperationException
// when we try to write to it. Note that XmlWriter doesn't always throw an XmlException when it enters Error state.
// The right thing to do is we don't write any more because at this point we don't know what's been written to the underlying
// stream. However we still should flush the writer to make sure that all the content that was written but is sitting in the buffers actually appears
// in the stream before writing the instream error. Otherwise the buffer will be flushed when disposing the writer later and we would end up with
// either content written after the instream error (this would also result in having the Xml declaration in the middle of the payload -
// [Astoria-ODataLib-Integration] In-stream errors due to XmlExceptions are written out backwards (error before partial valid payload)) or,
// hypothetically, the instream error in the middle of the other content that was already partially written. For example we can end up with a payload that
// looks like <element attr="val<m:error... The XmlReader would not be able to parse the error payload in this case. Disposing the writer will flush the buffer.
// It is fine to do it since the writer is not usable at this point anyways. Also note that the writer will be disposed more than once (e.g. in finally block
// in ResponseBodySerializer) but only the first call will have any effect.
// However since in the versions we shipped we always create a new XmlWriter to serialize the error payload when the existing
// one is in error state, we will continue to do the same to avoid introducing any breaking change here.
messageWriter.WriteError(error, args.UseVerboseErrors);
}
catch (ODataException e)
{
// Yikes, ODataLib threw while writing the error. This tends to happen if the service author did something invalid during custom
// error handling, such as add an custom instance annotation to the error payload. In this dire case, we treat it almost like
// an in-stream error, and abort the previous writing. We write out the new error. Note that this will produce an invalid payload like
// the situation noted above with XmlWriter errors.
WebUtil.Dispose(messageWriter);
messageWriterBuilder.SetMessageForErrorInError();
var newErrorWriter = messageWriterBuilder.CreateWriter();
ODataError errorWhileWritingOtherError = new ODataError()
{
ErrorCode = "500",
InnerError = new ODataInnerError(e),
Message = Strings.ErrorHandler_ErrorWhileWritingError
};
newErrorWriter.WriteError(errorWhileWritingOtherError, args.UseVerboseErrors);
}
catch (InvalidOperationException)
{
Debug.Assert(ContentTypeUtil.IsNotJson(args.ResponseContentType), "Should never get here for JSON responses");
WebUtil.Dispose(messageWriter);
// if either an InvalidOperationException was encountered (see comment above) or the message writer was null, write the error out manually.
Debug.Assert(responseStream != null, "responseStream != null");
using (XmlWriter xmlWriter = XmlWriter.Create(responseStream, XmlUtil.CreateXmlWriterSettings(encoding)))
{
ErrorUtils.WriteXmlError(xmlWriter, error, args.UseVerboseErrors, MaxInnerErrorDepth);
}
}
}
}
/// <inheritdoc/>
public override void WriteObject(object graph, Type type, ODataMessageWriter messageWriter, ODataSerializerContext writeContext)
{
if (graph == null)
{
throw Error.ArgumentNull("graph");
}
if (messageWriter == null)
{
throw Error.ArgumentNull("messageWriter");
}
ODataError oDataError = GetError(graph);
bool includeDebugInformation = oDataError.InnerError != null;
messageWriter.WriteError(oDataError, includeDebugInformation);
}
public void Write(MemoryStream stream, NephosErrorDetails errorDetails, Exception errorException, bool useVerboseErrors)
{
if (stream == null)
{
throw new ArgumentNullException("stream");
}
if (errorDetails == null)
{
throw new ArgumentNullException("errorDetails");
}
string item = null;
string str = null;
if (errorDetails.ResponseHeaders != null)
{
item = errorDetails.ResponseHeaders["Content-Type"];
str = errorDetails.ResponseHeaders["DataServiceVersion"];
}
if (string.IsNullOrWhiteSpace(item))
{
throw new ArgumentException(string.Format("errorDetails should contain a valid value for the key [{0}] in ResponseHeader.", "Content-Type"));
}
if (string.IsNullOrWhiteSpace(str))
{
throw new ArgumentException(string.Format("errorDetails should contain a valid value for the key [{0}] in ResponseHeader.", "MaxDataServiceVersion"));
}
ODataError oDataError = new ODataError()
{
ErrorCode = errorDetails.StatusEntry.StatusId,
Message = errorDetails.UserSafeErrorMessage,
MessageLanguage = "en-US",
InnerError = new ODataInnerError(errorException)
};
ODataMessageWriterSettings oDataMessageWriterSetting = new ODataMessageWriterSettings()
{
DisableMessageStreamDisposal = true
};
ResponseMessage responseMessage = new ResponseMessage(stream);
responseMessage.SetHeader("MaxDataServiceVersion", str);
responseMessage.SetHeader("Content-Type", item);
using (ODataMessageWriter oDataMessageWriter = new ODataMessageWriter(responseMessage, oDataMessageWriterSetting))
{
oDataMessageWriter.WriteError(oDataError, useVerboseErrors);
}
}
internal static void SerializeODataError(HandleExceptionArgs args, ODataMessageWriter writer, Stream outputStream, Encoding encoding)
{
ODataError error = CreateODataErrorFromExceptionArgs(args);
try
{
writer.WriteError(error, args.UseVerboseErrors);
}
catch (InvalidOperationException)
{
if (!WebUtil.CompareMimeType(args.ResponseContentType, "application/json;odata=verbose"))
{
WebUtil.Dispose(writer);
using (XmlWriter writer2 = XmlWriter.Create(outputStream, XmlUtil.CreateXmlWriterSettings(encoding)))
{
ErrorUtils.WriteXmlError(writer2, error, args.UseVerboseErrors, 100);
}
}
}
}
public void ShouldBeAbleToWriteCustomInstanceAnnotationToErrorInJsonLight()
{
const string expectedPayload =
"{" +
"\"error\":{" +
"\"code\":\"400\"," +
"\"message\":\"Resource not found for the segment 'Address'.\"," +
"\"@instance.annotation\":\"stringValue\"" +
"}" +
"}";
var writerSettings = new ODataMessageWriterSettings {
DisableMessageStreamDisposal = true
};
writerSettings.SetContentType(ODataFormat.Json);
writerSettings.ODataUri = new ODataUri()
{
ServiceRoot = new Uri("http://www.example.com")
};
MemoryStream stream = new MemoryStream();
IODataResponseMessage messageToWrite = new InMemoryMessage {
StatusCode = 400, Stream = stream
};
// Write payload
using (var messageWriter = new ODataMessageWriter(messageToWrite, writerSettings, Model))
{
ODataError error = new ODataError {
ErrorCode = "400", Message = "Resource not found for the segment 'Address'."
};
error.InstanceAnnotations.Add(new ODataInstanceAnnotation("instance.annotation", new ODataPrimitiveValue("stringValue")));
messageWriter.WriteError(error, includeDebugInformation: true);
}
stream.Position = 0;
string payload = (new StreamReader(stream)).ReadToEnd();
payload.Should().Be(expectedPayload);
}
public override void WriteObject(object graph, ODataMessageWriter messageWriter, ODataSerializerContext writeContext)
{
if (graph == null)
{
throw Error.ArgumentNull("graph");
}
if (messageWriter == null)
{
throw Error.ArgumentNull("messageWriter");
}
ODataError odataError = graph as ODataError;
if (odataError == null)
{
throw Error.InvalidOperation(SRResources.ErrorTypeMustBeODataError, graph.GetType().FullName);
}
bool includeDebugInformation = odataError.InnerError != null;
messageWriter.WriteError(odataError, includeDebugInformation);
}
public override void WriteObject(object graph, ODataMessageWriter messageWriter, ODataSerializerWriteContext writeContext)
{
if (graph == null)
{
throw Error.ArgumentNull("graph");
}
if (messageWriter == null)
{
throw Error.ArgumentNull("messageWriter");
}
ODataError odataError = graph as ODataError;
if (odataError == null)
{
throw Error.InvalidOperation(SRResources.ErrorTypeMustBeODataError, graph.GetType().FullName);
}
bool includeDebugInformation = odataError.InnerError != null;
messageWriter.WriteError(odataError, includeDebugInformation);
}
/// <summary>
/// Writes an ODataError with the given custom instance annotation to the test stream.
/// </summary>
private void WriteError(params KeyValuePair<string, ODataValue>[] annotations)
{
var writerSettings = new ODataMessageWriterSettings { DisableMessageStreamDisposal = true };
writerSettings.SetContentType(ODataFormat.Json);
writerSettings.SetServiceDocumentUri(new Uri("http://example.com/"));
IODataResponseMessage messageToWrite = new InMemoryMessage { StatusCode = 400, Stream = this.stream };
var error = new ODataError();
var instanceAnnotations = new Collection<ODataInstanceAnnotation>();
error.SetInstanceAnnotations(instanceAnnotations);
foreach (var pair in annotations)
{
ODataInstanceAnnotation annotation = new ODataInstanceAnnotation(pair.Key, pair.Value);
instanceAnnotations.Add(annotation);
}
using (var writer = new ODataMessageWriter(messageToWrite, writerSettings, this.model))
{
writer.WriteError(error, false);
}
}
internal static void SerializeODataError(HandleExceptionArgs args, ODataMessageWriter writer, Stream outputStream, Encoding encoding)
{
ODataError error = CreateODataErrorFromExceptionArgs(args);
try
{
writer.WriteError(error, args.UseVerboseErrors);
}
catch (InvalidOperationException)
{
if (!WebUtil.CompareMimeType(args.ResponseContentType, "application/json;odata=verbose"))
{
WebUtil.Dispose(writer);
using (XmlWriter writer2 = XmlWriter.Create(outputStream, XmlUtil.CreateXmlWriterSettings(encoding)))
{
ErrorUtils.WriteXmlError(writer2, error, args.UseVerboseErrors, 100);
}
}
}
}
public async Task WriteInStreamError_APIsShouldYieldSameResult()
{
var nestedWriterSettings = new ODataMessageWriterSettings
{
Version = ODataVersion.V4,
EnableMessageStreamDisposal = false
};
nestedWriterSettings.SetServiceDocumentUri(new Uri(ServiceUri));
var asyncException = await Assert.ThrowsAsync <ODataException>(async() =>
{
IODataResponseMessage asyncResponseMessage = new InMemoryMessage {
StatusCode = 200, Stream = this.asyncStream
};
using (var messageWriter = new ODataMessageWriter(asyncResponseMessage, writerSettings))
{
// Call to CreateODataAsynchronousWriterAsync triggers setting of output in-stream error listener
var asynchronousWriter = await messageWriter.CreateODataAsynchronousWriterAsync();
var responseMessage = await asynchronousWriter.CreateResponseMessageAsync();
responseMessage.StatusCode = 200;
// Next section added is to demonstrate that what was already written is flushed to the buffer before exception is thrown
using (var nestedMessageWriter = new ODataMessageWriter(responseMessage, nestedWriterSettings))
{
var writer = await nestedMessageWriter.CreateODataResourceWriterAsync();
}
await messageWriter.WriteErrorAsync(
new ODataError {
ErrorCode = "NRE", Message = "Object reference not set to an instance of an object."
},
/*includeDebugInformation*/ true);
}
});
this.asyncStream.Position = 0;
var asyncResult = await new StreamReader(this.asyncStream).ReadToEndAsync();
var syncException = await Assert.ThrowsAsync <ODataException>(
() => TaskUtils.GetTaskForSynchronousOperation(() =>
{
IODataResponseMessage syncResponseMessage = new InMemoryMessage {
StatusCode = 200, Stream = this.syncStream
};
using (var messageWriter = new ODataMessageWriter(syncResponseMessage, writerSettings))
{
// Call to CreateODataAsynchronousWriterAsync triggers setting of output in-stream error listener
var asynchronousWriter = messageWriter.CreateODataAsynchronousWriter();
var responseMessage = asynchronousWriter.CreateResponseMessage();
responseMessage.StatusCode = 200;
// Next section is added to demonstrate that what was already written is flushed to the buffer before exception is thrown
using (var nestedMessageWriter = new ODataMessageWriter(responseMessage, nestedWriterSettings))
{
var writer = nestedMessageWriter.CreateODataResourceWriter();
}
messageWriter.WriteError(
new ODataError {
ErrorCode = "NRE", Message = "Object reference not set to an instance of an object."
},
/*includeDebugInformation*/ true);
}
}));
this.syncStream.Position = 0;
var syncResult = await new StreamReader(this.syncStream).ReadToEndAsync();
var expected = @"HTTP/1.1 200 OK
OData-Version: 4.0
Content-Type: application/json;odata.metadata=minimal;odata.streaming=true;IEEE754Compatible=false;charset=utf-8
";
Assert.Equal(Strings.ODataAsyncWriter_CannotWriteInStreamErrorForAsync, asyncException.Message);
Assert.Equal(Strings.ODataAsyncWriter_CannotWriteInStreamErrorForAsync, syncException.Message);
Assert.Equal(expected, asyncResult);
Assert.Equal(expected, syncResult);
}
/// <summary>
/// Writes the error with fallback logic for XML cases where the writer is in an error state and a new writer must be created.
/// </summary>
/// <param name="messageWriter">The message writer.</param>
/// <param name="encoding">The encoding to use for the error if we have to fallback.</param>
/// <param name="responseStream">The response stream to write to in the fallback case.</param>
/// <param name="args">The args for the error.</param>
/// <param name="error">The error to write.</param>
/// <param name="messageWriterBuilder">MessageWriterBuilder to use if a new ODataMessageWriter needs to be constructed.</param>
private static void WriteErrorWithFallbackForXml(ODataMessageWriter messageWriter, Encoding encoding, Stream responseStream, HandleExceptionArgs args, ODataError error, MessageWriterBuilder messageWriterBuilder)
{
Debug.Assert(args != null, "args != null");
#if DEBUG
Debug.Assert(args.ProcessExceptionWasCalled, "ProcessException was not called by the time we tried to serialze this error message with ODataLib.");
#endif
if (messageWriter != null)
{
try
{
// If the XmlWriter inside the ODataMessageWriter had entered Error state, ODataMessageWriter.WriteError would throw an InvalidOperationException
// when we try to write to it. Note that XmlWriter doesn't always throw an XmlException when it enters Error state.
// The right thing to do is we don't write any more because at this point we don't know what's been written to the underlying
// stream. However we still should flush the writer to make sure that all the content that was written but is sitting in the buffers actually appears
// in the stream before writing the instream error. Otherwise the buffer will be flushed when disposing the writer later and we would end up with
// either content written after the instream error (this would also result in having the Xml declaration in the middle of the payload -
// [Astoria-ODataLib-Integration] In-stream errors due to XmlExceptions are written out backwards (error before partial valid payload)) or,
// hypothetically, the instream error in the middle of the other content that was already partially written. For example we can end up with a payload that
// looks like <element attr="val<m:error... The XmlReader would not be able to parse the error payload in this case. Disposing the writer will flush the buffer.
// It is fine to do it since the writer is not usable at this point anyways. Also note that the writer will be disposed more than once (e.g. in finally block
// in ResponseBodySerializer) but only the first call will have any effect.
// However since in the versions we shipped we always create a new XmlWriter to serialize the error payload when the existing
// one is in error state, we will continue to do the same to avoid introducing any breaking change here.
messageWriter.WriteError(error, args.UseVerboseErrors);
}
catch (ODataException e)
{
// Yikes, ODataLib threw while writing the error. This tends to happen if the service author did something invalid during custom
// error handling, such as add an custom instance annotation to the error payload. In this dire case, we treat it almost like
// an in-stream error, and abort the previous writing. We write out the new error. Note that this will produce an invalid payload like
// the situation noted above with XmlWriter errors.
WebUtil.Dispose(messageWriter);
messageWriterBuilder.SetMessageForErrorInError();
var newErrorWriter = messageWriterBuilder.CreateWriter();
ODataError errorWhileWritingOtherError = new ODataError()
{
ErrorCode = "500",
InnerError = new ODataInnerError(e),
Message = Strings.ErrorHandler_ErrorWhileWritingError
};
newErrorWriter.WriteError(errorWhileWritingOtherError, args.UseVerboseErrors);
}
catch (InvalidOperationException)
{
Debug.Assert(ContentTypeUtil.IsNotJson(args.ResponseContentType), "Should never get here for JSON responses");
WebUtil.Dispose(messageWriter);
// if either an InvalidOperationException was encountered (see comment above) or the message writer was null, write the error out manually.
Debug.Assert(responseStream != null, "responseStream != null");
using (XmlWriter xmlWriter = XmlWriter.Create(responseStream, XmlUtil.CreateXmlWriterSettings(encoding)))
{
ErrorUtils.WriteXmlError(xmlWriter, error, args.UseVerboseErrors, MaxInnerErrorDepth);
}
}
}
}
public void ShouldBeAbleToWriteCustomInstanceAnnotationToErrorInJsonLight()
{
const string expectedPayload =
"{" +
"\"error\":{" +
"\"code\":\"400\"," +
"\"message\":\"Resource not found for the segment 'Address'.\"," +
"\"@instance.annotation\":\"stringValue\"" +
"}" +
"}";
var writerSettings = new ODataMessageWriterSettings { DisableMessageStreamDisposal = true };
writerSettings.SetContentType(ODataFormat.Json);
writerSettings.ODataUri = new ODataUri() { ServiceRoot = new Uri("http://www.example.com") };
MemoryStream stream = new MemoryStream();
IODataResponseMessage messageToWrite = new InMemoryMessage { StatusCode = 400, Stream = stream };
// Write payload
using (var messageWriter = new ODataMessageWriter(messageToWrite, writerSettings, Model))
{
ODataError error = new ODataError { ErrorCode = "400", Message = "Resource not found for the segment 'Address'." };
error.InstanceAnnotations.Add(new ODataInstanceAnnotation("instance.annotation", new ODataPrimitiveValue("stringValue")));
messageWriter.WriteError(error, includeDebugInformation: true);
}
stream.Position = 0;
string payload = (new StreamReader(stream)).ReadToEnd();
payload.Should().Be(expectedPayload);
}
