public void SetURI()
{
var device = new WebDiscoveryDevice {
DiscoveryUri = new Uri("http://test.com")
};
Assert.IsNotNull(device.DiscoveryUri);
Assert.AreEqual("http://test.com/", device.DiscoveryUri.ToString());
}
/// <summary>
/// Fetches the discovery document from either a local cache if it exsits otherwise using
/// a WebDiscoveryDecivce
/// </summary>
/// <returns>
/// A <see cref="System.String"/>
/// </returns>
public Stream Fetch()
{
FileInfo cachedFile = GetCacheFile();
bool fetchFile = false;
// Check if we need to (re)download the document
if (cachedFile.Exists == false)
{
logger.Debug("Document Not Found In Cache, fetching from web");
fetchFile = true;
}
else if ((DateTime.UtcNow - cachedFile.LastWriteTimeUtc).TotalSeconds > CacheDuration)
{
logger.Debug("Document is outdated, refetching from web");
fetchFile = true;
}
else
{
logger.Debug("Found Document In Cache");
}
// (re-)Fetch the document
if (fetchFile)
{
try
{
using (var device = new WebDiscoveryDevice(DiscoveryUri))
{
WriteToCache(device);
}
}
catch (WebException ex)
{
// If we have a working cached file, we can still return it
if (cachedFile.Exists)
{
logger.Warning(
string.Format(
"Failed to refetch an outdated cache document [{0}]" +
" - Using cached document. Exception: {1}", DiscoveryUri, ex.Message), ex);
return(cachedFile.OpenRead());
}
// Otherwise: Throw the exception
throw;
}
}
fileStream = cachedFile.OpenRead();
return(fileStream);
}
private void WriteToCache(WebDiscoveryDevice device)
{
using (Stream webDocument = device.Fetch())
{
FileInfo fileInfo = GetCacheFile();
using (FileStream cachedFileStream = fileInfo.OpenWrite())
{
var buffer = new byte[BufferSize];
int read;
while ((read = webDocument.Read(buffer, 0, buffer.Length)) > 0)
{
cachedFileStream.Write(buffer, 0, read);
}
cachedFileStream.Close();
}
}
}