/// <summary>
/// Executes the <param name="method"></param> with exception handling.
/// </summary>
/// <typeparam name="TResult">The type of the result.</typeparam>
/// <param name="method">The method.</param>
/// <returns>The object of type TResult.</returns>
private static async Task <TResult> ExecuteWithExceptionHandlingAsync <TResult>(Func <Task <TResult> > method)
{
try
{
return(await method());
}
catch (WebException ex)
{
using (var streamReader = new StreamReader(ex.Response.GetResponseStream()))
{
var response = streamReader.ReadToEnd();
// Deserializes to exception
RetailProxyException crtException = null;
if (DefaultExceptionHandlingBehavior.TryDeserializeFromJsonString(response, out crtException) && crtException != null)
{
throw crtException;
}
else
{
// If exception is not mapped to a commerce runtime exception, throws the local exception based on HTTP status code.
CommunicationExceptionHelper.ThrowAsRetailProxyExceptionOnHttpStatuCode(ex, (int)((HttpWebResponse)ex.Response).StatusCode);
throw ex;
}
}
}
}
/// <summary>
/// Tries to throws a commerce exception, if the result could be serialized as a commerce exception; Proceeds silently, otherwise.
/// </summary>
/// <param name="result">The serialized return result.</param>
private static void TryThrowAsCommerceException(string result)
{
if (!string.IsNullOrWhiteSpace(result))
{
RetailProxyException crtException = null;
if (DefaultExceptionHandlingBehavior.TryDeserializeFromJsonString(result, out crtException) &&
crtException != null)
{
throw crtException;
}
}
}
/// <summary>
/// Traverses and throws the commerce exception from the input exception hierarchy.
/// </summary>
/// <param name="exception">The exception to traverse.</param>
public static void ThrowAsCommerceException(Exception exception)
{
Exception tempException = exception == null ? null : exception.InnerException;
while (tempException != null && !string.IsNullOrWhiteSpace(tempException.Message))
{
// Deserializes to exception
RetailProxyException crtException = null;
if (DefaultExceptionHandlingBehavior.TryDeserializeFromJsonString(tempException.Message, out crtException) &&
crtException != null)
{
throw crtException;
}
tempException = tempException.InnerException;
}
}
/// <summary>
/// Executes an action with the proper error handling logic.
/// </summary>
/// <typeparam name="T">The return type.</typeparam>
/// <param name="action">The action to be performed.</param>
/// <returns>The returned value from the action.</returns>
private static Task <T> Execute <T>(Func <T> action)
{
return(Task.Run(() =>
{
try
{
return action();
}
catch (Exception ex)
{
string exceptionResponse = ex.SerializeToCommerceException();
RetailProxyException crtException = null;
if (DefaultExceptionHandlingBehavior.TryDeserializeFromJsonString(exceptionResponse, out crtException) && crtException != null)
{
throw crtException;
}
throw new RetailProxyException(string.Format("Unexpected exception payload {0}.", exceptionResponse));
}
}));
}
