/// <summary>
/// Resolves address and reads the <see cref="DomainModel"/> record as an asynchronous operation.
/// </summary>
/// <param name="modelUri">The model URI.</param>
/// <param name="rootZoneUrl">The root zone URL where the resolving process shall start.</param>
/// <param name="log"><see cref="Action{T1, T2, T3}"/> encapsulating tracing functionality .</param>
/// <returns>Task{DomainModel}.</returns>
/// <exception cref="InvalidOperationException">Too many iteration in the resolving process.</exception>
public async Task <DomainModel> ResolveDomainModelAsync(Uri modelUri, Uri rootZoneUrl, Action <string, TraceEventType, Priority> log)
{
log($"Starting resolving address of the domain model descriptor for the model Uri {modelUri}", TraceEventType.Verbose, Priority.Low);
DomainDescriptor _lastDomainDescriptor = new DomainDescriptor()
{
NextStepRecordType = RecordType.DomainDescriptor
};
Uri _nextUri = rootZoneUrl;
int _iteration = 0;
do
{
_iteration++;
log($"Resolving address iteration {_iteration} address: {_nextUri}", TraceEventType.Verbose, Priority.Low);
if (_iteration > 16)
{
throw new InvalidOperationException("Too many iteration in the resolving process.");
}
_lastDomainDescriptor = await GetHTTPResponseAsync <DomainDescriptor>(_nextUri, log);
_nextUri = _lastDomainDescriptor.ResolveUri(modelUri);
} while (_lastDomainDescriptor.NextStepRecordType == RecordType.DomainDescriptor);
log($"Reading DomainModel at: {_nextUri}", TraceEventType.Verbose, Priority.Low);
Task <DomainModel> _DomainModelTask = GetHTTPResponseAsync <DomainModel>(_nextUri, log);
DomainModel _model = await _DomainModelTask;
_model.UniversalDiscoveryServiceLocator = _nextUri.ToString();
log($"Successfuly received and decoded the requested DomainModel record: {_nextUri}", TraceEventType.Verbose, Priority.Low);
return(_model);
}
public void GetRootDomainDescriptorTest()
{
DomainDescriptor _rootDomainDescriptor = DomainDescriptorFactory.GetRootDomainDescriptor();
Uri _resolution = _rootDomainDescriptor.ResolveUri(m_ModelUri);
string m_ExpectedFirsRoundUrl = "https://raw.githubusercontent.com/mpostol/OPC-UA-OOI/master/DataDiscovery/Tests/DiscoveryServices.UnitTest/TestData/root.zone/commsvr.com/DomainDescriptor.xml";
Assert.AreEqual <string>(m_ExpectedFirsRoundUrl, _resolution.ToString());
string _fn = "RootDomainDescriptor.xml";
FileInfo _fi = new FileInfo($@"TestData\{_fn}");
using (Stream _outputStream = _fi.Create())
{
XmlSerializer _serializer = new XmlSerializer(typeof(DomainDescriptor));
_serializer.Serialize(_outputStream, _rootDomainDescriptor);
}
_fi.Refresh();
Assert.IsTrue(_fi.Exists);
Assert.IsTrue(_fi.Length > 0);
DomainDescriptor _tc;
using (Stream _descriptionStream = _fi.OpenRead())
{
XmlSerializer _serializer = new XmlSerializer(typeof(DomainDescriptor));
_tc = (DomainDescriptor)_serializer.Deserialize(_descriptionStream);
Assert.IsNotNull(_tc);
}
Assert.IsTrue(_tc.Description.Contains("Starting point"));
Assert.AreEqual <RecordType>(RecordType.DomainDescriptor, _tc.NextStepRecordType);
Assert.AreEqual <string>(@"https://raw.githubusercontent.com/mpostol/OPC-UA-OOI/master/DataDiscovery/Tests/DiscoveryServices.UnitTest/TestData/root.zone/#authority#/DomainDescriptor.xml", _tc.UrlPattern);
_resolution = _tc.ResolveUri(m_ModelUri);
Assert.AreEqual <string>(m_ExpectedFirsRoundUrl, _resolution.ToString());
}