public static string GetPoliticianImageColumnNameByWidth(int width)
{
var politicianImageInfo =
PoliticianImageInfoList.SingleOrDefault(info => info.MaxWidth == width);
return(politicianImageInfo == null
? string.Empty
: PoliticiansImagesBlobs.GetColumnName(politicianImageInfo.BlobsColumn));
}
private void BackgroundWorker_DoWork(object sender, DoWorkEventArgs e)
{
try
{
var politicianKey = PoliticianKeyTextBox.Text.Trim();
if (IsNullOrEmpty(politicianKey))
{
throw new VoteException("Politician Key is missing");
}
if (IsNullOrEmpty(FolderTextBox.Text.Trim()))
{
throw new VoteException("Save Folder is missing");
}
var folder = new DirectoryInfo(FolderTextBox.Text.Trim());
if (!folder.Exists)
{
throw new VoteException("Save Folder does not exist");
}
var newOriginalsTable =
LogDataChange.GetDataByTableNameColumnNameKeyValues(
PoliticiansImagesBlobs.TableName,
PoliticiansImagesBlobs.GetColumnName(
PoliticiansImagesBlobs.Column.ProfileOriginal), politicianKey, 0);
var newHeadshotsTable =
LogDataChange.GetDataByTableNameColumnNameKeyValues(
PoliticiansImagesBlobs.TableName,
PoliticiansImagesBlobs.GetColumnName(
PoliticiansImagesBlobs.Column.Headshot100), politicianKey, 0);
var images = new List <ImageInfo>();
images.AddRange(newOriginalsTable.Where(row => row.NewValue != null)
.Select(row => new ImageInfo
{
ImageType = "Profile",
Date = row.DateStamp,
User = row.UserName,
Blob = Convert.FromBase64String(row.NewValue)
}));
images.AddRange(newHeadshotsTable.Where(row => row.NewValue != null)
.Select(row => new ImageInfo
{
ImageType = "Headshot",
Date = row.DateStamp,
User = row.UserName,
Blob = Convert.FromBase64String(row.NewValue)
}));
if (images.Count == 0)
{
throw new VoteException("No logged images found for this Politician Key");
}
folder.CreateSubdirectory(politicianKey);
AppendStatusText("Found {0} images:", images.Count);
foreach (var imageInfo in images)
{
var memoryStream = new MemoryStream(imageInfo.Blob);
var image = Image.FromStream(memoryStream);
var contentType = ImageManager.GetContentType(image);
var extension = $".{contentType.Replace("image/", "")}";
var filename =
$"{imageInfo.ImageType}_{imageInfo.Date:yyyy-MM-dd-HH-mm-ss}_{imageInfo.User}{extension}";
var path = Path.Combine(folder.FullName, politicianKey, filename);
File.WriteAllBytes(path, imageInfo.Blob);
AppendStatusText(filename);
}
AppendStatusText(Empty);
}
catch (VoteException ex)
{
AppendStatusText(ex.Message);
}
catch (Exception ex)
{
AppendStatusText(ex.ToString());
}
}
private static void ServeImageContent(string politicianKey, string column,
string defaultColumn, DateTime lastModDate, bool isModified, bool noCache)
{
var response = HttpContext.Current.Response;
//var maxAge = new TimeSpan(24, 0, 0); // 24 hours -- used in headers
var maxAge = new TimeSpan(0, 0, 0); // force a server query always
var expiration = DateTime.UtcNow + maxAge;
var isProfileOriginal =
column.IsEqIgnoreCase(
PoliticiansImagesBlobs.GetColumnName(
PoliticiansImagesBlobs.Column.ProfileOriginal));
if (!isModified)
{
response.StatusCode = 304;
response.StatusDescription = "Not Modified";
}
response.Cache.SetCacheability(HttpCacheability.Public);
response.Cache.SetETag('"' +
lastModDate.Ticks.ToString(CultureInfo.InvariantCulture) + '"');
response.Cache.SetLastModified(lastModDate);
response.Cache.SetMaxAge(maxAge);
response.Cache.SetExpires(expiration);
response.Cache.SetSlidingExpiration(false);
response.Cache.SetRevalidation(HttpCacheRevalidation.AllCaches);
if (isModified) // serve actual image
{
var cache = HttpContext.Current.Cache;
var cacheKey = "politicianImage." + politicianKey + "." + column;
ApplicationCacheEntry cacheEntry = null;
// We don't use memory cache for profile originals
if (!noCache && !isProfileOriginal)
{
cacheEntry = cache.Get(cacheKey) as ApplicationCacheEntry;
}
if (cacheEntry != null && cacheEntry.Expiration > DateTime.UtcNow)
{
response.ContentType = cacheEntry.ContentType;
response.BinaryWrite(cacheEntry.Blob);
Interlocked.Increment(ref CurrentStatistics.ImagesServedFromMemoryCache);
}
else
{
var blob = GetPoliticianImage(politicianKey, column, defaultColumn,
noCache);
if (blob != null)
{
// we get the content type from the actual image
var contentType = GetContentType(blob);
response.ContentType = contentType;
response.BinaryWrite(blob);
if (!isProfileOriginal)
{
var cacheExpiration =
DateTime.UtcNow.AddMinutes(MemCache.CacheExpiration);
cacheEntry = new ApplicationCacheEntry
{
Expiration = cacheExpiration,
Blob = blob,
ContentType = contentType
};
cache.Add(cacheKey, cacheEntry, null, cacheExpiration,
Cache.NoSlidingExpiration, CacheItemPriority.Normal, null);
}
Interlocked.Increment(ref CurrentStatistics.ImagesServedFromDisc);
}
}
}
else // tell browser to use cached version
{
response.AddHeader("Content-Length", "0");
Interlocked.Increment(ref CurrentStatistics.ImagesServedFromBrowserCache);
}
if (_LastStatisticsSnapshot.SnapshotTime + StatisticsSnapshotInterval <
DateTime.UtcNow)
{
// May need to snapshot statistics, but make sure only one thread does it
if (Interlocked.Exchange(ref _SnapshottingStatistics, 1) == 0)
// it's our job
{
var previousSnapshot = _LastStatisticsSnapshot;
_LastStatisticsSnapshot = CurrentStatistics.Clone();
_LastStatisticsSnapshot.SnapshotTime = DateTime.UtcNow;
VotePage.LogInfo("ImageCaching",
$"Image caching from {previousSnapshot.SnapshotTime} to {_LastStatisticsSnapshot.SnapshotTime}:" +
$" {_LastStatisticsSnapshot.ImagesServedFromBrowserCache - previousSnapshot.ImagesServedFromBrowserCache} from browser cache," +
$" {_LastStatisticsSnapshot.ImagesServedFromMemoryCache - previousSnapshot.ImagesServedFromMemoryCache} from memory cache," +
$" {_LastStatisticsSnapshot.ImagesServedFromDisc - previousSnapshot.ImagesServedFromDisc} from disc");
Interlocked.Exchange(ref _SnapshottingStatistics, 0);
}
}
response.End();
}
