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FileStreamResultExecutor.cs
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FileStreamResultExecutor.cs
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// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc.Internal;
using Microsoft.Extensions.Logging;
using Microsoft.Net.Http.Headers;
namespace Microsoft.AspNetCore.Mvc.Infrastructure
{
public class FileStreamResultExecutor : FileResultExecutorBase, IActionResultExecutor<FileStreamResult>
{
public FileStreamResultExecutor(ILoggerFactory loggerFactory)
: base(CreateLogger<FileStreamResultExecutor>(loggerFactory))
{
}
/// <inheritdoc />
public virtual async Task ExecuteAsync(ActionContext context, FileStreamResult result)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (result == null)
{
throw new ArgumentNullException(nameof(result));
}
using (result.FileStream)
{
Logger.ExecutingFileResult(result);
long? fileLength = null;
if (result.FileStream.CanSeek)
{
fileLength = result.FileStream.Length;
}
var (range, rangeLength, serveBody) = SetHeadersAndLog(
context,
result,
fileLength,
result.EnableRangeProcessing,
result.LastModified,
result.EntityTag);
if (!serveBody)
{
return;
}
await WriteFileAsync(context, result, range, rangeLength);
}
}
protected virtual Task WriteFileAsync(
ActionContext context,
FileStreamResult result,
RangeItemHeaderValue range,
long rangeLength)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (result == null)
{
throw new ArgumentNullException(nameof(result));
}
if (range != null && rangeLength == 0)
{
return Task.CompletedTask;
}
if (range != null)
{
Logger.WritingRangeToBody();
}
return WriteFileAsync(context.HttpContext, result.FileStream, range, rangeLength);
}
}
}