public async Task Invoke(HttpContext context)
{
try
{
await _next(context);
}
catch (BaseApiException ex)
{
var statusCode = _mapper.GetExceptionHandlerReturnCode(ex);
_logger.LogDebug(ex, "Mapped BaseApiException of type {ExceptionType} caught, decorating response status code: {StatusCode}.", ex.GetType(), statusCode.ToString());
context.Response.StatusCode = (int)statusCode;
throw;
}
catch (ApiException ex)
{
_logger.LogDebug(ex, "ApiException caught, decorating response status code: {StatusCode}.", ex.StatusCode.ToString());
context.Response.StatusCode = (int)ex.StatusCode;
throw;
}
catch (Exception ex)
{
_logger.LogDebug(ex, "Exception caught, decorating response status code: {StatusCode}.", HttpStatusCode.InternalServerError.ToString());
context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
throw;
}
}
internal static ApiError Build <TCategoryName>(HttpContext context, Exception ex, IExceptionMapper mapper,
ILogger <TCategoryName> logger, bool isDevelopment)
{
context.Response.ContentType = "application/json";
HttpStatusCode statusCode;
int errorCode;
object developerContext = null;
switch (ex)
{
case BaseApiException _:
try
{
developerContext = (ex as BaseApiException)?.DeveloperContext;
errorCode = mapper.GetErrorCode(ex as BaseApiException);
statusCode = mapper.GetExceptionHandlerReturnCode(ex as BaseApiException);
context.Response.StatusCode = (int)statusCode;
logger.LogInformation(ex,
"Mapped BaseApiException of type {exceptionType} caught by ApiExceptionHandler. Will return with {statusCodeInt} {statusCodeString}. Unexpected: {unexpected}",
ex.GetType(), (int)statusCode, statusCode.ToString(), false);
}
catch (ArgumentException)
{
goto default;
}
break;
case ApiException _:
errorCode = -2;
statusCode = (ex as ApiException).StatusCode;
context.Response.StatusCode = (int)statusCode;
logger.LogInformation(ex,
"ApiException caught by ApiExceptionHandler with {statusCodeInt} {statusCodeString}. Unexpected: {unexpected}", (int)statusCode, statusCode.ToString(), false);
break;
default:
errorCode = -1;
statusCode = HttpStatusCode.InternalServerError;
context.Response.StatusCode = (int)statusCode;
logger.LogError(ex,
"Unhandled exception of type {exceptionType} caught by ApiExceptionHandler. Will return with {statusCodeInt} {statusCodeString}. Unexpected: {unexpected}",
ex.GetType(), (int)statusCode, statusCode.ToString(), true);
break;
}
var error = new ApiError(mapper.Options.ServiceName)
{
CorrelationId = context.TraceIdentifier,
DeveloperContext = developerContext,
ErrorCode = errorCode,
};
if (isDevelopment)
{
error.Message = ex.Message;
error.DetailedMessage = ex.ToAsyncString();
}
else
{
error.Message = Regex.Replace(statusCode.ToString(), "[a-z][A-Z]",
m => m.Value[0] + " " + char.ToLower(m.Value[1]));
error.DetailedMessage = ex.Message;
}
return(error);
}
internal static ApiError Build <TCategoryName>(HttpContext context, Exception ex, IExceptionMapper mapper,
ILogger <TCategoryName> logger, bool isDevelopment, Action <Exception>[] exceptionListeners)
{
//Execute custom exception handlers first.
foreach (var customExceptionListener in exceptionListeners)
{
try
{
customExceptionListener.Invoke(ex);
}
catch (Exception e)
{
logger.LogWarning(e, "Custom exception listener {exceptionListener} threw an exception.", customExceptionListener.GetType().ToString());
}
}
context.Response.ContentType = "application/json";
HttpStatusCode statusCode;
(int errorCode, string error)errorObject;
object developerContext = null;
object exceptionContext = new {};
switch (ex)
{
case BaseApiException baseApiException:
try
{
if (mapper.Options.RespondWithDeveloperContext)
{
developerContext = baseApiException.DeveloperContext;
}
exceptionContext = baseApiException.Context;
errorObject = mapper.GetError(baseApiException);
statusCode = mapper.GetExceptionHandlerReturnCode(baseApiException);
context.Response.StatusCode = (int)statusCode;
logger.LogInformation(ex,
"Mapped BaseApiException of type {exceptionType} caught by ApiExceptionHandler. Will return with {statusCodeInt} {statusCodeString}. Unexpected: {unexpected}",
ex.GetType(), (int)statusCode, statusCode.ToString(), false);
}
catch (ArgumentException)
{
goto default;
}
break;
case OperationCanceledException _:
errorObject = (-1, "Frogvall.AspNetCore.ExceptionHandling.OperationCanceled");
statusCode = HttpStatusCode.InternalServerError;
context.Response.StatusCode = (int)statusCode;
logger.LogWarning(ex,
"OperationCanceledException exception caught by ApiExceptionHandler. Will return with {statusCodeInt} {statusCodeString}. Unexpected: {unexpected}",
(int)statusCode, statusCode.ToString(), true);
break;
default:
errorObject = (-1, "Frogvall.AspNetCore.ExceptionHandling.InternalServerError");
statusCode = HttpStatusCode.InternalServerError;
context.Response.StatusCode = (int)statusCode;
logger.LogError(ex,
"Unhandled exception of type {exceptionType} caught by ApiExceptionHandler. Will return with {statusCodeInt} {statusCodeString}. Unexpected: {unexpected}",
ex.GetType(), (int)statusCode, statusCode.ToString(), true);
break;
}
var error = new ApiError(mapper.Options.ServiceName)
{
CorrelationId = context.TraceIdentifier,
Context = exceptionContext,
DeveloperContext = developerContext,
ErrorCode = errorObject.errorCode,
Error = errorObject.error
};
if (isDevelopment)
{
error.Message = ex.Message;
error.DetailedMessage = ex.ToString();
}
else
{
error.Message = Regex.Replace(statusCode.ToString(), "[a-z][A-Z]",
m => m.Value[0] + " " + char.ToLower(m.Value[1]));
error.DetailedMessage = ex.Message;
}
return(error);
}