/// <summary>
/// Handles the request for a cached tile.
/// </summary>
/// <param name="options"></param>
/// <param name="pathParts">The path parts from the request.</param>
/// <param name="fileName">The filename from the request.</param>
/// <param name="clientEndpoint"></param>
/// <param name="headers">The request headers.</param>
/// <returns></returns>
public WebRequestOutcome ProcessRequest(Options options, IEnumerable <string> pathParts, string fileName, IPAddress clientEndpoint, RequestHeadersDictionary headers)
{
var result = new WebRequestOutcome();
var displayOutcome = new RequestOutcome()
{
ID = Interlocked.Increment(ref _NextID),
ReceivedUtc = DateTime.UtcNow,
};
RecentRequestOutcomes.Add(displayOutcome);
try {
var urlValues = _TileServerUrlTranslator.ExtractEncodedValuesFromUrlParts(pathParts, fileName);
displayOutcome.CopyUrlValues(urlValues);
if (urlValues != null)
{
var cachedContent = TileCache.GetCachedTile(urlValues);
if (cachedContent != null)
{
result.ImageBytes = cachedContent.Content;
displayOutcome.ServedFromCache = true;
Interlocked.Increment(ref _CountServedFromCache);
Plugin.Singleton?.RefreshStatusDescription();
}
else
{
if (options.IsOfflineModeEnabled)
{
displayOutcome.MissingFromCache = true;
result.StatusCode = HttpStatusCode.NotFound;
}
else
{
FetchTileServerImage(options, urlValues, clientEndpoint, headers, result, displayOutcome);
if (result.ImageBytes?.Length > 0)
{
TileCache.SaveTile(urlValues, result.ImageBytes);
}
}
}
if (result.ImageBytes != null)
{
result.StatusCode = HttpStatusCode.OK;
result.ImageExtension = urlValues.TileImageExtension;
}
}
} catch (ThreadAbortException) {
displayOutcome.Abandoned = true;
; // .NET will rethrow this automatically
} catch {
displayOutcome.ExceptionEncountered = true;
throw;
} finally {
try {
displayOutcome.CompletedUtc = DateTime.UtcNow;
} catch {
; // Don't want to confuse the issue with exceptions when trying to update the outcome display
}
}
return(result);
}
public void TestInitialise()
{
_UnderlyingDictionary = new Dictionary <string, string[]>(StringComparer.OrdinalIgnoreCase);
_RequestHeaders = new RequestHeadersDictionary(_UnderlyingDictionary);
}
