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improve image serving performance slightly

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This commit is contained in:
Luke Pulverenti
2013-09-23 20:04:02 -04:00
parent bb281d4bcc
commit cbd767ddce
2 changed files with 67 additions and 42 deletions
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94
MediaBrowser.Server.Implementations/Drawing/ImageProcessor.cs
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@@ -121,7 +121,7 @@ namespace MediaBrowser.Server.Implementations.Drawing
}
catch (IOException)
{
// Cache file doesn't exist or is currently being written ro
// Cache file doesn't exist or is currently being written to
}
var semaphore = GetLock(cacheFilePath);
@@ -129,21 +129,24 @@ namespace MediaBrowser.Server.Implementations.Drawing
await semaphore.WaitAsync().ConfigureAwait(false);
// Check again in case of lock contention
if (File.Exists(cacheFilePath))
try
{
try
{
using (var fileStream = new FileStream(cacheFilePath, FileMode.Open, FileAccess.Read, FileShare.Read, StreamDefaults.DefaultFileStreamBufferSize, FileOptions.Asynchronous))
{
await fileStream.CopyToAsync(toStream).ConfigureAwait(false);
return;
}
}
finally
using (var fileStream = new FileStream(cacheFilePath, FileMode.Open, FileAccess.Read, FileShare.Read, StreamDefaults.DefaultFileStreamBufferSize, FileOptions.Asynchronous))
{
await fileStream.CopyToAsync(toStream).ConfigureAwait(false);
semaphore.Release();
return;
}
}
catch (IOException)
{
// Cache file doesn't exist or is currently being written to
}
catch
{
semaphore.Release();
throw;
}
try
{
@@ -188,12 +191,10 @@ namespace MediaBrowser.Server.Implementations.Drawing
var bytes = outputMemoryStream.ToArray();
var outputTask = toStream.WriteAsync(bytes, 0, bytes.Length);
await toStream.WriteAsync(bytes, 0, bytes.Length).ConfigureAwait(false);
// kick off a task to cache the result
var cacheTask = CacheResizedImage(cacheFilePath, bytes);
await Task.WhenAll(outputTask, cacheTask).ConfigureAwait(false);
CacheResizedImage(cacheFilePath, bytes, semaphore);
}
}
}
@@ -202,12 +203,51 @@ namespace MediaBrowser.Server.Implementations.Drawing
}
}
}
finally
catch
{
semaphore.Release();
throw;
}
}
/// <summary>
/// Caches the resized image.
/// </summary>
/// <param name="cacheFilePath">The cache file path.</param>
/// <param name="bytes">The bytes.</param>
/// <param name="semaphore">The semaphore.</param>
private void CacheResizedImage(string cacheFilePath, byte[] bytes, SemaphoreSlim semaphore)
{
Task.Run(async () =>
{
try
{
var parentPath = Path.GetDirectoryName(cacheFilePath);
if (!Directory.Exists(parentPath))
{
Directory.CreateDirectory(parentPath);
}
// Save to the cache location
using (var cacheFileStream = new FileStream(cacheFilePath, FileMode.Create, FileAccess.Write, FileShare.Read, StreamDefaults.DefaultFileStreamBufferSize, FileOptions.Asynchronous))
{
// Save to the filestream
await cacheFileStream.WriteAsync(bytes, 0, bytes.Length).ConfigureAwait(false);
}
}
catch (Exception ex)
{
_logger.ErrorException("Error writing to image cache file {0}", ex, cacheFilePath);
}
finally
{
semaphore.Release();
}
});
}
/// <summary>
/// Sets the color of the background.
/// </summary>
@@ -363,28 +403,6 @@ namespace MediaBrowser.Server.Implementations.Drawing
return croppedImagePath;
}
/// <summary>
/// Caches the resized image.
/// </summary>
/// <param name="cacheFilePath">The cache file path.</param>
/// <param name="bytes">The bytes.</param>
private async Task CacheResizedImage(string cacheFilePath, byte[] bytes)
{
var parentPath = Path.GetDirectoryName(cacheFilePath);
if (!Directory.Exists(parentPath))
{
Directory.CreateDirectory(parentPath);
}
// Save to the cache location
using (var cacheFileStream = new FileStream(cacheFilePath, FileMode.Create, FileAccess.Write, FileShare.Read, StreamDefaults.DefaultFileStreamBufferSize, FileOptions.Asynchronous))
{
// Save to the filestream
await cacheFileStream.WriteAsync(bytes, 0, bytes.Length).ConfigureAwait(false);
}
}
/// <summary>
/// Gets the cache file path based on a set of parameters
/// </summary>