private async Task ProcessWithNoCache(HttpContext context, ImageJobInfo info)
{
// If we're not caching, we should always use the modified date from source blobs as part of the etag
var betterCacheKey = await info.GetExactCacheKey();
if (context.Request.Headers.TryGetValue(HeaderNames.IfNoneMatch, out var etag) && betterCacheKey == etag)
{
context.Response.StatusCode = StatusCodes.Status304NotModified;
context.Response.ContentLength = 0;
context.Response.ContentType = null;
return;
}
if (info.HasParams)
{
logger?.LogInformation($"Processing image {info.FinalVirtualPath} with params {info.CommandString}");
var imageData = await info.ProcessUncached();
var imageBytes = imageData.ResultBytes;
var contentType = imageData.ContentType;
// write to stream
context.Response.ContentType = contentType;
context.Response.ContentLength = imageBytes.Count;
SetCachingHeaders(context, betterCacheKey);
await context.Response.Body.WriteAsync(imageBytes.Array, imageBytes.Offset, imageBytes.Count);
}
else
{
logger?.LogInformation($"Proxying image {info.FinalVirtualPath} with params {info.CommandString}");
var contentType = PathHelpers.ContentTypeForImageExtension(info.EstimatedFileExtension);
await using var sourceStream = (await info.GetPrimaryBlob()).OpenRead();
if (sourceStream.CanSeek)
{
if (sourceStream.Length == 0)
{
throw new InvalidOperationException("Source blob has zero bytes.");
}
context.Response.ContentType = contentType;
context.Response.ContentLength = sourceStream.Length;
SetCachingHeaders(context, betterCacheKey);
await sourceStream.CopyToAsync(context.Response.Body);
}
else
{
context.Response.ContentType = contentType;
SetCachingHeaders(context, betterCacheKey);
await sourceStream.CopyToAsync(context.Response.Body);
}
}
}
private async Task ProcessWithNoCache(HttpContext context, ImageJobInfo info)
{
// If we're not caching, we should always use the modified date from source blobs as part of the etag
var betterCacheKey = await info.GetExactCacheKey();
if (context.Request.Headers.TryGetValue(HeaderNames.IfNoneMatch, out var etag) && betterCacheKey == etag)
{
GlobalPerf.Singleton.IncrementCounter("etag_hit");
context.Response.StatusCode = StatusCodes.Status304NotModified;
context.Response.ContentLength = 0;
context.Response.ContentType = null;
return;
}
GlobalPerf.Singleton.IncrementCounter("etag_miss");
if (info.HasParams)
{
logger?.LogInformation("Processing image {VirtualPath} with params {CommandString}", info.FinalVirtualPath, info.CommandString);
GlobalPerf.Singleton.IncrementCounter("nocache_processed");
var imageData = await info.ProcessUncached();
var imageBytes = imageData.ResultBytes;
var contentType = imageData.ContentType;
// write to stream
context.Response.ContentType = contentType;
context.Response.ContentLength = imageBytes.Count;
SetCachingHeaders(context, betterCacheKey);
if (imageBytes.Array == null)
{
throw new InvalidOperationException("Image job returned zero bytes.");
}
await context.Response.Body.WriteAsync(imageBytes.Array, imageBytes.Offset, imageBytes.Count);
}
else
{
logger?.LogInformation("Proxying image {VirtualPath} with params {CommandString}", info.FinalVirtualPath, info.CommandString);
GlobalPerf.Singleton.IncrementCounter("nocache_proxied");
await using var sourceStream = (await info.GetPrimaryBlob()).OpenRead();
SetCachingHeaders(context, betterCacheKey);
await MagicBytes.ProxyToStream(sourceStream, context.Response);
}
}
