private void ProcessUserDataTask(object ignored)
{
CtxTrace.TraceInformation();
// Check sanity of configuration
if (userDataUrl.Contains(DhcpServerPlaceholder))
{
List <IPAddress> dhcpServers = NetworkUtilities.GetDhcpServers();
if (dhcpServers.Count == 0)
{
CtxTrace.TraceError("Configured to get UserData from DHCP server, but no DHCP server found");
stateService.InitialisationComplete = true;
}
}
// UserData may be a little slow to be delivered
while (!stateService.InitialisationComplete && !stopSignalled)
{
string userData = GetUserData();
if (!string.IsNullOrEmpty(userData))
{
// May be multiple root elements, so wrap for Xml parser
string wrappedUserData = string.Format("<dummyRoot>{0}</dummyRoot>", userData);
try {
XDocument doc = XDocument.Parse(wrappedUserData);
XElement script = doc.XPathSelectElement("//script");
if (script != null)
{
// Script may initiate a reboot, so mark the processing done once userData read.
stateService.InitialisationComplete = true;
ExecuteScript(script.Value);
}
script = doc.XPathSelectElement("//powershell");
if (script != null)
{
// Script may initiate a reboot, so mark the processing done once userData read.
stateService.InitialisationComplete = true;
ExecutePowerShellScript(script.Value);
}
} catch (Exception ex) {
CtxTrace.TraceError(ex);
}
break;
}
// Sleep a while but ensure timely response to task cancel
DateTime waitUntil = DateTime.Now + TimeSpan.FromSeconds(5);
while (!stopSignalled && (DateTime.Now < waitUntil))
{
Thread.Sleep(TimeSpan.FromMilliseconds(1000));
}
}
CtxTrace.TraceInformation("Task exit");
}
private string GetUserData()
{
if (userDataUrl.Contains(DhcpServerPlaceholder))
{
List <IPAddress> dhcpServers = NetworkUtilities.GetDhcpServers();
foreach (IPAddress address in dhcpServers)
{
string userData = NetworkUtilities.HttpGet(userDataUrl.Replace(DhcpServerPlaceholder, address.ToString()));
if (userData != null)
{
return(userData);
}
}
return(null);
}
else
{
return(NetworkUtilities.HttpGet(userDataUrl));
}
}