void getResponseCallback <T>(IAsyncResult result) where T : new()
{
SDBAsyncResult sdbAsyncResult = result as SDBAsyncResult;
if (null == sdbAsyncResult)
{
sdbAsyncResult = result.AsyncState as SDBAsyncResult;
}
sdbAsyncResult.RequestState.GetResponseCallbackCalled = true;
bool shouldRetry = false;
try
{
HttpStatusCode statusCode;
RequestState state = sdbAsyncResult.RequestState;
HttpWebResponse httpResponse = null;
try
{
httpResponse = state.WebRequest.EndGetResponse(result) as HttpWebResponse;
sdbAsyncResult.FinalSDBResponse = handleHttpResponse <T>(httpResponse, out statusCode) as SimpleDBResponse;
}
catch (WebException we)
{
shouldRetry = handleHttpWebErrorResponse(sdbAsyncResult, we, out statusCode);
}
if (shouldRetry)
{
sdbAsyncResult.RequestState.WebRequest.Abort();
sdbAsyncResult.RetriesAttempt++;
handleRetry(sdbAsyncResult, statusCode);
invoke <T>(sdbAsyncResult);
}
}
catch (Exception e)
{
AmazonSimpleDBException exception = e as AmazonSimpleDBException;
if (null != exception)
{
sdbAsyncResult.FinalSDBResponse = exception;
return;
}
sdbAsyncResult.RequestState.WebRequest.Abort();
LOGGER.Error("Error for GetResponse", e);
sdbAsyncResult.Exception = e;
shouldRetry = false;
}
finally
{
if (!shouldRetry)
{
if (null != OnSimpleDBResponse)
{
OnSimpleDBResponse.Invoke(this, new ResponseEventArgs(sdbAsyncResult.FinalSDBResponse));
}
}
}
}
/**
* Look for additional error strings in the response and return formatted exception
*/
private static AmazonSimpleDBException reportAnyErrors(string responseBody, HttpStatusCode status)
{
AmazonSimpleDBException ex = null;
if (responseBody != null && responseBody.StartsWith("<", StringComparison.OrdinalIgnoreCase))
{
Match errorMatcherOne = Regex.Match(
responseBody,
"<RequestId>(.*)</RequestId>.*<Error><Code>(.*)</Code><Message>(.*)</Message></Error>.*(<Error>)?",
RegexOptions.Multiline
);
Match errorMatcherTwo = Regex.Match(
responseBody,
"<Error><Code>(.*)</Code><Message>(.*)</Message></Error>.*(<Error>)?.*<RequestID>(.*)</RequestID>",
RegexOptions.Multiline
);
Match errorMatcherThree = Regex.Match(
responseBody,
"<Error><Code>(.*)</Code><Message>(.*)</Message><BoxUsage>(.*)</BoxUsage></Error>.*(<Error>)?.*<RequestID>(.*)</RequestID>",
RegexOptions.Multiline);
if (errorMatcherOne.Success)
{
string requestId = errorMatcherOne.Groups[1].Value;
string code = errorMatcherOne.Groups[2].Value;
string message = errorMatcherOne.Groups[3].Value;
ex = new AmazonSimpleDBException(message, status, code, "Unknown", null, requestId, responseBody);
}
else if (errorMatcherTwo.Success)
{
string code = errorMatcherTwo.Groups[1].Value;
string message = errorMatcherTwo.Groups[2].Value;
string requestId = errorMatcherTwo.Groups[4].Value;
ex = new AmazonSimpleDBException(message, status, code, "Unknown", null, requestId, responseBody);
}
else if (errorMatcherThree.Success)
{
string code = errorMatcherThree.Groups[1].Value;
string message = errorMatcherThree.Groups[2].Value;
string boxUsage = errorMatcherThree.Groups[3].Value;
string requestId = errorMatcherThree.Groups[5].Value;
ex = new AmazonSimpleDBException(message, status, code, "Unknown", boxUsage, requestId, responseBody);
}
else
{
ex = new AmazonSimpleDBException("Internal Error", status);
}
}
else
{
ex = new AmazonSimpleDBException("Internal Error", status);
}
return(ex);
}
/// <summary>
/// Constructs AmazonSimpleDBException with message and wrapped exception
/// </summary>
/// <param name="message">Overview of error</param>
/// <param name="t">Wrapped exception</param>
public AmazonSimpleDBException(String message, Exception t) : base(message, t)
{
this.message = message;
if (t is AmazonSimpleDBException)
{
AmazonSimpleDBException ex = (AmazonSimpleDBException)t;
this.statusCode = ex.StatusCode;
this.errorCode = ex.ErrorCode;
this.errorType = ex.ErrorType;
this.boxUsage = ex.BoxUsage;
this.requestId = ex.RequestId;
this.xml = ex.XML;
}
}
public AmazonSimpleDBException(string message, Exception innerException) : base(message, innerException)
{
this.message = message;
AmazonSimpleDBException exception = innerException as AmazonSimpleDBException;
if (exception != null)
{
this.statusCode = exception.StatusCode;
this.errorCode = exception.ErrorCode;
this.errorType = exception.ErrorType;
this.boxUsage = exception.BoxUsage;
this.requestId = exception.RequestId;
this.xml = exception.XML;
}
}
/**
* Invoke request and return response
*/
private T Invoke <T>(IDictionary <String, String> parameters)
{
String actionName = parameters["Action"];
T response = default(T);
String responseBody = null;
HttpStatusCode statusCode = default(HttpStatusCode);
/* Add required request parameters */
AddRequiredParameters(parameters);
String queryString = GetParametersAsString(parameters);
byte[] requestData = new UTF8Encoding().GetBytes(queryString);
bool shouldRetry = true;
int retries = 0;
do
{
HttpWebRequest request = ConfigureWebRequest(requestData.Length);
/* Submit the request and read response body */
try
{
using (Stream requestStream = request.GetRequestStream())
{
requestStream.Write(requestData, 0, requestData.Length);
}
using (HttpWebResponse httpResponse = request.GetResponse() as HttpWebResponse)
{
statusCode = httpResponse.StatusCode;
StreamReader reader = new StreamReader(httpResponse.GetResponseStream(), Encoding.UTF8);
responseBody = reader.ReadToEnd();
}
/* Attempt to deserialize response into <Action> Response type */
XmlSerializer serlizer = new XmlSerializer(typeof(T));
response = (T)serlizer.Deserialize(new StringReader(responseBody));
shouldRetry = false;
}
/* Web exception is thrown on unsucessful responses */
catch (WebException we)
{
shouldRetry = false;
using (HttpWebResponse httpErrorResponse = (HttpWebResponse)we.Response as HttpWebResponse)
{
if (httpErrorResponse == null)
{
throw new AmazonSimpleDBException(we);
}
statusCode = httpErrorResponse.StatusCode;
StreamReader reader = new StreamReader(httpErrorResponse.GetResponseStream(), Encoding.UTF8);
responseBody = reader.ReadToEnd();
}
if (statusCode == HttpStatusCode.InternalServerError || statusCode == HttpStatusCode.ServiceUnavailable)
{
shouldRetry = true;
PauseOnRetry(++retries, statusCode);
}
else
{
/* Attempt to deserialize response into ErrorResponse type */
try
{
XmlSerializer serlizer = new XmlSerializer(typeof(ErrorResponse));
ErrorResponse errorResponse = (ErrorResponse)serlizer.Deserialize(new StringReader(responseBody));
Error error = errorResponse.Error[0];
/* Throw formatted exception with information available from the error response */
throw new AmazonSimpleDBException(
error.Message,
statusCode,
error.Code,
error.Type,
null,
errorResponse.RequestId,
errorResponse.ToXML());
}
/* Rethrow on deserializer error */
catch (Exception e)
{
if (e is AmazonSimpleDBException)
{
throw e;
}
else
{
AmazonSimpleDBException se = ReportAnyErrors(responseBody, statusCode, e);
throw se;
}
}
}
}
/* Catch other exceptions, attempt to convert to formatted exception,
* else rethrow wrapped exception */
catch (Exception e)
{
throw new AmazonSimpleDBException(e);
}
} while (shouldRetry);
return(response);
}
void SimpleDBErrorResponse(AmazonSimpleDBException error)
{
StringBuilder errorBuilder = new StringBuilder();
errorBuilder.AppendLine(string.Format(CultureInfo.InvariantCulture, "ERROR CODE: {0}", error.ErrorCode));
errorBuilder.AppendLine(string.Format(CultureInfo.InvariantCulture, "INNER EXCEPTION: {0}", error.InnerException));
errorBuilder.AppendLine(string.Format(CultureInfo.InvariantCulture, "MESSAGE: {0}", error.Message));
errorBuilder.AppendLine(string.Format(CultureInfo.InvariantCulture, "REQUEST ID: {0}", error.RequestId));
errorBuilder.AppendLine(string.Format(CultureInfo.InvariantCulture, "STATUS CODE: {0}", error.StatusCode)); ;
errorBuilder.AppendLine(string.Format(CultureInfo.InvariantCulture, "\nERROR RESPONSE:\n {0}", error.XML));
this.Dispatcher.BeginInvoke(() =>
{
MessageBox.Show(errorBuilder.ToString(), "Error Occured", MessageBoxButton.OK);
});
}
