public override async Task ProcessRequestAsync(HttpContext context)
{
HttpRequest request = context.Request;
HttpResponse response = context.Response;
int frameId = request.IntOrZero("frame");
int trace = request.IntOrZero("trace");
try
{
// set headers, prevent client caching, return PNG
response.Clear();
response.Cache.SetCacheability(HttpCacheability.NoCache);
response.Cache.SetSlidingExpiration(true);
response.Cache.SetNoStore();
response.ContentType = "image/png";
byte[] data = null;
int panelHeight = -1, panelWidth = -1;
RenderModes mode = RenderModes.RenderMode_Crop;
Report report = new Report(frameId);
if (report.FrameId != 0)
{
Panel panel = new Panel(report.PanelId);
if (panel.PanelId != 0)
{
panelWidth = panel.Width;
panelHeight = panel.Height;
}
mode = report.Mode;
//TiffBitmapDecoder decoder = new TiffBitmapDecoder(imageStreamSource, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);
//BitmapSource bitmapSource = decoder.Frames[0];
data = await HttpRuntime.Cache.GetOrAddAbsoluteAsync(
report.CacheKey,
async (expire) =>
{
expire.When = DateTime.Now.AddMinutes(report.CacheInterval);
// get response from report server
WebClient client = new WebClient();
if (!string.IsNullOrWhiteSpace(report.User))
{
client.Credentials = new NetworkCredential(
report.User.Trim(),
Encryptor.Current.Decrypt(report.Password),
report.Domain.Trim()
);
}
byte[] repBytes = await client.DownloadDataTaskAsync(report.Url);
if (repBytes == null)
{
return(null);
}
using (MemoryStream trg = new MemoryStream())
using (MemoryStream src = new MemoryStream(repBytes))
{
await Task.Run(() => Picture.WriteImage(src, trg, panelWidth, panelHeight, mode));
return(trg.GetBuffer());
}
});
}
if (data != null)
{
await response.OutputStream.WriteAsync(data, 0, data.Length);
}
else
{
Content missingContent = await Content.GetMissingContentAsync();
using (MemoryStream ms = new MemoryStream(missingContent.Data))
{
await Task.Run(() => Picture.WriteImage(ms, response.OutputStream, -1, -1, RenderModes.RenderMode_Crop));
}
}
await response.OutputStream.FlushAsync();
}
catch (Exception ex)
{
Debug.Print(string.Format("getReport error: {0}", ex.Message));
if (trace == 0)
{
response.Write(ex.Message);
}
else
{
response.Write(ex.ToString());
}
}
/*finally
* {
* Response.OutputStream.Flush();
* }*/
}