/**
* Extract an {@link ErrorCodes} response from the error object encoded in an {@link
* HttpResponseException}.
*
* @param httpResponseException the response exception
* @return the parsed {@link ErrorCodes} if found
* @throws HttpResponseException rethrows the original exception if an error object could not be
* parsed, if there were multiple error objects, or if the error code is unknown.
*/
public static async Task <ErrorCode> GetErrorCodeAsync(HttpResponseMessage httpResponse)
{
httpResponse = httpResponse ?? throw new ArgumentNullException(nameof(httpResponse));
// Obtain the error response code.
string errorContent = await httpResponse.Content.ReadAsStringAsync().ConfigureAwait(false);
if (errorContent == null)
{
throw new HttpResponseException(httpResponse);
}
try
{
ErrorResponseTemplate errorResponse =
JsonTemplateMapper.ReadJson <ErrorResponseTemplate>(errorContent);
IReadOnlyList <ErrorEntryTemplate> errors = errorResponse?.Errors;
// There may be multiple error objects
if (errors?.Count == 1)
{
var errorCode = errors[0].Code;
// May not get an error code back.
if (errorCode.HasValue)
{
return(errorCode.GetValueOrDefault());
}
}
}
catch (Exception e) when(e is IOException || e is ArgumentException)
{
// Parse exception: either isn't an error object or unknown error code
}
// rethrow the original exception
throw new HttpResponseException(httpResponse);
}
public async Task TestHandleHttpResponseExceptionAsync()
{
ErrorResponseTemplate emptyErrorResponseTemplate =
new ErrorResponseTemplate()
.AddError(new ErrorEntryTemplate(ErrorCode.BlobUnknown, "some message"));
using (HttpResponseMessage mockHttpResponseException = new HttpResponseMessage(HttpStatusCode.NotFound)
{
Content = new StringContent(JsonTemplateMapper.ToUtf8String(emptyErrorResponseTemplate))
})
{
bool result =
await testBlobChecker.HandleHttpResponseExceptionAsync(mockHttpResponseException).ConfigureAwait(false);
Assert.IsFalse(result);
}
}
public async Task TestHandleHttpResponseException_notBlobUnknownAsync()
{
ErrorResponseTemplate emptyErrorResponseTemplate = new ErrorResponseTemplate();
using (HttpResponseMessage mockHttpResponseException = new HttpResponseMessage(HttpStatusCode.NotFound)
{
Content = new StringContent(JsonTemplateMapper.ToUtf8String(emptyErrorResponseTemplate))
})
{
try
{
await testBlobChecker.HandleHttpResponseExceptionAsync(mockHttpResponseException).ConfigureAwait(false);
Assert.Fail("Non-BLOB_UNKNOWN errors should not be handled");
}
catch (HttpResponseException ex)
{
Assert.AreEqual(mockHttpResponseException, ex.Cause);
}
}
}
