80 lines
3.1 KiB
C#
80 lines
3.1 KiB
C#
// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
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// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
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using System;
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using System.Threading.Tasks;
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using Microsoft.AspNet.Builder;
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using Microsoft.AspNet.Http;
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using Microsoft.Framework.Logging;
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namespace Microsoft.AspNet.Diagnostics
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{
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public class ErrorHandlerMiddleware
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{
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private readonly RequestDelegate _next;
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private readonly ErrorHandlerOptions _options;
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private readonly ILogger _logger;
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public ErrorHandlerMiddleware(RequestDelegate next, ILoggerFactory loggerFactory, ErrorHandlerOptions options)
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{
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_next = next;
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_options = options;
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_logger = loggerFactory.Create<ErrorHandlerMiddleware>();
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if (_options.ErrorHandler == null)
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{
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_options.ErrorHandler = _next;
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}
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}
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public async Task Invoke(HttpContext context)
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{
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var responseStarted = false;
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try
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{
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context.Response.OnSendingHeaders(state => responseStarted = true, null);
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await _next(context);
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}
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catch (Exception ex)
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{
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_logger.WriteError("An unhandled exception has occurred: " + ex.Message, ex);
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// We can't do anything if the response has already started, just abort.
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if (responseStarted)
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{
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_logger.WriteWarning("The response has already started, the error handler will not be executed.");
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throw;
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}
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PathString originalPath = context.Request.Path;
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if (_options.ErrorHandlingPath.HasValue)
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{
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context.Request.Path = _options.ErrorHandlingPath;
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}
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try
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{
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var errorHandlerFeature = new ErrorHandlerFeature()
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{
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Error = ex,
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};
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context.SetFeature<IErrorHandlerFeature>(errorHandlerFeature);
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context.Response.StatusCode = 500;
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context.Response.Headers.Clear();
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// TODO: Try clearing any buffered data. The buffering feature/middleware has not been designed yet.
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await _options.ErrorHandler(context);
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// TODO: Optional re-throw? We'll re-throw the original exception by default if the error handler throws.
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return;
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}
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catch (Exception ex2)
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{
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// Suppress secondary exceptions, re-throw the original.
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_logger.WriteError("An exception was thrown attempting to execute the error handler.", ex2);
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}
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finally
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{
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context.Request.Path = originalPath;
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}
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throw; // Re-throw the original if we couldn't handle it
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}
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}
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}
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} |