/// <summary>
/// Constructs AmazonSQSException with message and wrapped exception
/// </summary>
/// <param name="message">Overview of error</param>
/// <param name="t">Wrapped exception</param>
public AmazonSQSException(String message, Exception t) : base(message, t)
{
this.message = message;
if (t is AmazonSQSException)
{
AmazonSQSException ex = (AmazonSQSException)t;
this.statusCode = ex.StatusCode;
this.errorCode = ex.ErrorCode;
this.errorType = ex.ErrorType;
this.requestId = ex.RequestId;
this.xml = ex.XML;
}
}
public AmazonSQSException(string message, Exception innerException) : base(message, innerException)
{
this.message = message;
AmazonSQSException exception = innerException as AmazonSQSException;
if (exception != null)
{
this.statusCode = exception.StatusCode;
this.errorCode = exception.ErrorCode;
this.errorType = exception.ErrorType;
this.requestId = exception.RequestId;
this.xml = exception.XML;
}
}
/**
* Look for additional error strings in the response and return formatted exception
*/
private static AmazonSQSException ReportAnyErrors(string responseBody, HttpStatusCode status)
{
AmazonSQSException ex = null;
if (responseBody != null && responseBody.StartsWith("<"))
{
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);
if (errorMatcherOne.Success)
{
string requestId = errorMatcherOne.Groups[1].Value;
string code = errorMatcherOne.Groups[2].Value;
string message = errorMatcherOne.Groups[3].Value;
ex = new AmazonSQSException(message, status, code, "Unknown", 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 AmazonSQSException(message, status, code, "Unknown", requestId, responseBody);
}
else
{
ex = new AmazonSQSException("Internal Error", status);
}
}
else
{
ex = new AmazonSQSException("Internal Error", status);
}
return(ex);
}
private void amazonExceptionHandler(AmazonSQSException ex)
{
if(ex.ErrorCode.Equals("AWS.SimpleQueueService.NonExistentQueue"))
{
// Fatal Exception
String message = "The specified queue does not exist.";
log.Fatal(message);
throw new ApplicationException(message, ex);
}
else if(ex.ErrorCode.Equals("AccessDenied"))
{
// Fatal Exception
String message = "You do not have permission to read the queue.";
log.Fatal(message);
throw new ApplicationException(message, ex);
}
else
{
log.Warn("An unknown error has occurred. Will retry.", ex);
}
}
/**
* Invoke request and return response
*/
private T Invoke <T>(IDictionary <String, String> parameters)
{
String actionName = parameters["Action"];
T response = default(T);
String responseBody = null;
String queueUrl = parameters.ContainsKey("QueueUrl") ? parameters["QueueUrl"] : config.ServiceURL;
if (parameters.ContainsKey("QueueUrl"))
{
parameters.Remove("QueueUrl");
}
HttpStatusCode statusCode = default(HttpStatusCode);
/* Add required request parameters */
AddRequiredParameters(parameters, queueUrl);
String queryString = GetParametersAsString(parameters);
byte[] requestData = new UTF8Encoding().GetBytes(queryString);
bool shouldRetry = true;
int retries = 0;
do
{
HttpWebRequest request = ConfigureWebRequest(requestData.Length, queueUrl);
/* 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 AmazonSQSException(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 AmazonSQSException(
error.Message,
statusCode,
error.Code,
error.Type,
errorResponse.RequestId,
errorResponse.ToXML());
}
/* Rethrow on deserializer error */
catch (Exception e)
{
if (e is AmazonSQSException)
{
throw e;
}
else
{
AmazonSQSException 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 AmazonSQSException(e);
}
} while (shouldRetry);
return(response);
}
/**
* Invoke request and return response
*/
private T Invoke <T>(IDictionary <string, string> parameters)
{
T response = default(T);
string queueUrl = parameters.ContainsKey("QueueUrl") ? parameters["QueueUrl"] : config.ServiceURL;
if (parameters.ContainsKey("QueueUrl"))
{
parameters.Remove("QueueUrl");
}
HttpStatusCode statusCode = default(HttpStatusCode);
/* Add required request parameters */
AddRequiredParameters(parameters, queueUrl);
string queryString = AWSSDKUtils.GetParametersAsString(parameters);
bool shouldRetry = true;
int retries = 0;
int maxRetries = config.IsSetMaxErrorRetry() ? config.MaxErrorRetry : AWSSDKUtils.DefaultMaxRetry;
do
{
string responseBody = string.Empty;
HttpWebRequest request = ConfigureWebRequest(queueUrl, queryString);
/* Submit the request and read response body */
try
{
request.BeginGetResponse(asyncResponse =>
{
try
{
HttpWebResponse asyncResult = (HttpWebResponse)request.EndGetResponse(asyncResponse);
Stream streamResponse = asyncResult.GetResponseStream();
using (StreamReader streamRead = new StreamReader(streamResponse))
{
responseBody = streamRead.ReadToEnd();
XDocument doc = XDocument.Parse(responseBody);
XmlSerializer serializer = new XmlSerializer(typeof(T));
XmlReader xmlReader = doc.CreateReader();
response = (T)serializer.Deserialize(xmlReader);
// Disposing StreamReader automatically closes the underlying streams
}
OnSQSResponse.Invoke(this, new ResponseEventArgs(response as ISQSResponse));
}
catch (WebException we)
{
shouldRetry = false;
using (HttpWebResponse httpErrorResponse = we.Response as HttpWebResponse)
{
if (httpErrorResponse == null)
{
// Abort the unsuccessful request
request.Abort();
throw;
}
statusCode = httpErrorResponse.StatusCode;
using (StreamReader reader = new StreamReader(httpErrorResponse.GetResponseStream(), Encoding.UTF8))
{
responseBody = reader.ReadToEnd();
}
// Abort the unsuccessful request
request.Abort();
}
if (statusCode == HttpStatusCode.InternalServerError ||
statusCode == HttpStatusCode.ServiceUnavailable)
{
shouldRetry = true;
PauseOnRetry(++retries, maxRetries, statusCode);
}
else
{
AmazonSQSException amazonException = null;
/* Attempt to deserialize response into ErrorResponse type */
try
{
XDocument doc = XDocument.Parse(responseBody);
using (XmlReader sr = doc.CreateReader())
{
XmlSerializer serializer = new XmlSerializer(typeof(ErrorResponse));
ErrorResponse errorResponse = (ErrorResponse)serializer.Deserialize(sr);
Error error = errorResponse.Error.ElementAt(0);
///* Throw formatted exception with information available from the error response */
amazonException = new AmazonSQSException(
error.Message,
statusCode,
error.Code,
error.Type,
errorResponse.RequestId,
errorResponse.ToXML()
);
throw amazonException;
}
}
/* Rethrow on deserializer error */
catch (Exception e)
{
if (e is AmazonSQSException)
{
if (null != OnSQSResponse)
{
OnSQSResponse.Invoke(this, new ResponseEventArgs(amazonException));
}
}
else
{
if (null != OnSQSResponse)
{
OnSQSResponse.Invoke(this, new ResponseEventArgs(ReportAnyErrors(responseBody, statusCode)));
}
}
}
}
}
}, request);
shouldRetry = false;
}
/* Catch other exceptions, attempt to convert to formatted exception,
* else rethrow wrapped exception */
catch (Exception)
{
// Abort the unsuccessful request
request.Abort();
throw;
}
} while (shouldRetry);
return(response);
}
void SQSErrorResponse(AmazonSQSException error)
{
StringBuilder errorBuilder = new StringBuilder();
errorBuilder.AppendLine(string.Format(CultureInfo.InvariantCulture, "ERROR CODE: {0}", error.ErrorCode));
errorBuilder.AppendLine(string.Format(CultureInfo.InvariantCulture, "ERROR TYPE: {0}", error.ErrorType));
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);
});
}