public ApiExceptionMiddleware(ApiExceptionOptions options, RequestDelegate next,
ILogger <ApiExceptionMiddleware> logger)
{
_next = next;
_logger = logger;
_options = options;
}
public static IApplicationBuilder UseApiExceptionHandler(this IApplicationBuilder builder,
Action <ApiExceptionOptions> configureOptions)
{
var options = new ApiExceptionOptions();
configureOptions(options);
return(builder.UseMiddleware <ApiExceptionMiddleware>(options));
}
private async Task HandleExceptionAsync(HttpContext context, Exception exception, ApiExceptionOptions apiExceptionOptions)
{
var errorId = Guid.NewGuid().ToString();
// This is what we tell the client.
var outcome = new OperationOutcome
{
ErrorId = errorId,
Errors = Enumerable.Empty <string>(),
IsError = true,
Message = string.Format(Errors.UnhandledError, errorId),
OpResult = OpResult.Fail
};
apiExceptionOptions.AddResponseDetails?.Invoke(context, exception, outcome);
// This is what we log.
var resolvedExceptionMessage = GetInnermostExceptionMessage(exception);
var level = _options.DetermineLogLevel?.Invoke(exception) ?? LogLevel.Error;
_logger.Log(level,
EventIDs.EventIdUncaughtGlobal,
exception,
MessageTemplates.UncaughtGlobal,
resolvedExceptionMessage,
errorId
);
var apiResponse = new ApiResponse <IEnumerable <string> >
{
Data = Enumerable.Empty <string>(), Outcome = outcome
};
var result = JsonSerializer.Serialize(apiResponse, Common.JsonSerializerOptions);
context.Response.ContentType = MediaTypeNames.Application.Json;
context.Response.StatusCode = (int)HttpStatusCode.InternalServerError;
await context.Response.WriteAsync(result);
}
private async Task HandleExceptionAsync(HttpContext context, Exception exception, ApiExceptionOptions apiExceptionOptions)
{
var errorId = Guid.NewGuid().ToString();
// This is what we tell the client.
var outcome = OperationOutcome.UnSuccessfulOutcome;
outcome.ErrorId = errorId;
#if DEBUG
outcome.Message = Errors.UnhandledErrorDebug.FormatAs(exception.GetBaseException().Message);
outcome.Errors = exception.StackTrace.Split(
Environment.NewLine, StringSplitOptions.RemoveEmptyEntries
).Select(str => str.Trim()); // ease of readability, for debugging purposes 👍
#else
outcome.Message = Errors.UnhandledError.FormatAs(errorId);
#endif
apiExceptionOptions.AddResponseDetails?.Invoke(context, exception, outcome);
// This is what we log.
var resolvedExceptionMessage = GetInnermostExceptionMessage(exception);
var level = _options.DetermineLogLevel?.Invoke(exception) ?? LogLevel.Error;
_logger.Log(level,
EventIDs.EventIdUncaughtGlobal,
exception,
MessageTemplates.UncaughtGlobal,
resolvedExceptionMessage,
errorId
);
var apiResponse = new ApiResponse <object>
{
Data = null,
Outcome = outcome
};
var result = JsonSerializer.Serialize(apiResponse, Common.JsonSerializerOptions);
context.Response.ContentType = MediaTypeNames.Application.Json;
context.Response.StatusCode = StatusCodes.Status500InternalServerError;
await context.Response.WriteAsync(result);
}
