/// <summary>
/// Implemented by inheritors to perform the request on the provided web client.
/// </summary>
/// <param name="connection"></param>
protected override async Task OnProcessRequest(IWebChannelConnection connection)
{
byte[] requestedSessionsRawData = await connection.DownloadData(string.Format("/Hub/Hosts/{0}/RequestedSessions.xml", ClientId)).ConfigureAwait(false);
//even though it's a session list we can't actually deserialize it directly - because we cant use XmlSerializer
//since the types will not necessarily be public.
RequestedSessions = DataConverter.ByteArrayToSessionsListXml(requestedSessionsRawData);
}
/// <summary>
/// Convert a byte array to sessions list XML object without relying on XML Serializer
/// </summary>
/// <param name="rawData"></param>
/// <returns></returns>
public static SessionsListXml ByteArrayToSessionsListXml(byte[] rawData)
{
SessionsListXml sessionsListXml = new SessionsListXml();
using (MemoryStream inputStream = new MemoryStream(rawData))
{
using (TextReader textReader = new StreamReader(inputStream, Encoding.UTF8))
{
using (XmlReader xmlReader = XmlReader.Create(textReader))
{
//to load up the first element.
if (xmlReader.ReadToFollowing("SessionsListXml") == false)
{
//it isn't a sessions list..
throw new InvalidDataException("The provided XML data is not a sessions list");
}
string sessionsVersionRaw = xmlReader.GetAttribute("version");
if (string.IsNullOrEmpty(sessionsVersionRaw) == false)
{
sessionsListXml.version = long.Parse(sessionsVersionRaw);
}
if (xmlReader.ReadToFollowing("sessions"))
{
//this is a repeating section so we have to be ready for that...
List <SessionXml> sessions = new List <SessionXml>();
bool moreSessions = true;
while (moreSessions)
{
xmlReader.ReadStartElement();
if (xmlReader.LocalName.Equals("session"))
{
string guidRaw = xmlReader.GetAttribute("id");
string versionRaw = xmlReader.GetAttribute("version");
string deletedRaw = xmlReader.GetAttribute("deleted");
#if DEBUG
if ((string.IsNullOrEmpty(guidRaw)) && (Debugger.IsAttached))
{
Debugger.Break();
}
#endif
//now convert to a SessionXml object and add to the item.
SessionXml newSession = new SessionXml();
newSession.id = guidRaw;
newSession.version = long.Parse(versionRaw);
newSession.deleted = bool.Parse(deletedRaw);
sessions.Add(newSession);
//and if this isn't an empty session element, we need to end it.
if (xmlReader.IsEmptyElement == false)
{
xmlReader.ReadEndElement();
}
}
else
{
moreSessions = false;
}
}
sessionsListXml.sessions = sessions.ToArray();
}
}
}
}
return(sessionsListXml);
}
