/// <summary>
/// Check whether valid node and return service result if not.
/// </summary>
/// <param name="endpoint"></param>
/// <param name="request"></param>
/// <returns></returns>
private Task <ServiceResultModel> TestPublishNodeAsync(EndpointModel endpoint,
PublishStartRequestModel request)
{
// Test whether value exists and fail if not
return(_opc.ExecuteServiceAsync(endpoint, null,
TimeSpan.FromSeconds(10), async session => {
var readNode = request.Item.NodeId.ToNodeId(session.MessageContext);
if (NodeId.IsNull(readNode))
{
throw new ArgumentException(nameof(request.Item.NodeId));
}
var diagnostics = new List <OperationResultModel>();
var response = await session.ReadAsync(
(request.Header?.Diagnostics).ToStackModel(),
0, TimestampsToReturn.Both, new ReadValueIdCollection {
new ReadValueId {
NodeId = readNode,
AttributeId = Attributes.Value
}
});
OperationResultEx.Validate("Publish_" + readNode, diagnostics,
response.Results.Select(r => r.StatusCode),
response.DiagnosticInfos, false);
SessionClientEx.Validate(response.Results, response.DiagnosticInfos);
if (response.Results == null || response.Results.Count == 0)
{
return diagnostics.ToServiceModel(request.Header?.Diagnostics,
session.MessageContext);
}
return null;
}));
}
/// <summary>
/// Load references
/// </summary>
/// <param name="nodeModel"></param>
/// <param name="ct"></param>
/// <returns></returns>
public async Task FetchReferencesAsync(BaseNodeModel nodeModel, CancellationToken ct)
{
try {
// Read node with value
var response = await _client.ExecuteServiceAsync(_endpoint, _elevation,
_priority, ct, session => {
_encoder.Context.UpdateFromSession(session);
return(session.BrowseAsync(_diagnostics.ToStackModel(), null,
nodeModel.NodeId, 0u, Opc.Ua.BrowseDirection.Both,
ReferenceTypeIds.References, true, 0u));
});
SessionClientEx.Validate(response.Results, response.DiagnosticInfos);
OperationResultEx.Validate("Browse_" + nodeModel.NodeId, Diagnostics,
response.Results.Select(r => r.StatusCode), null, false);
while (true)
{
foreach (var reference in response.Results[0].References)
{
nodeModel.AddReference(reference.ReferenceTypeId,
!reference.IsForward, reference.NodeId);
_references++;
}
if (response.Results[0].ContinuationPoint == null)
{
break;
}
response = await _client.ExecuteServiceAsync(_endpoint, _elevation,
_priority, ct, session => {
_encoder.Context.UpdateFromSession(session);
return(session.BrowseNextAsync(_diagnostics.ToStackModel(), false,
new ByteStringCollection {
response.Results[0].ContinuationPoint
}));
});
SessionClientEx.Validate(response.Results, response.DiagnosticInfos);
OperationResultEx.Validate("BrowseNext_" + nodeModel.NodeId, Diagnostics,
response.Results.Select(r => r.StatusCode), null, false);
}
}
catch (Exception ex) {
_logger.Error(ex, "Failed browsing node object for node {nodeId}.",
nodeModel.NodeId);
}
}
/// <summary>
/// Validates responses against requests
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="operation"></param>
/// <param name="results"></param>
/// <param name="diagnostics"></param>
/// <param name="requested"></param>
/// <param name="operations"></param>
/// <param name="traceOnly"></param>
public static void Validate <T>(string operation,
List <OperationResultModel> operations, IEnumerable <StatusCode> results,
DiagnosticInfoCollection diagnostics, IEnumerable <T> requested, bool traceOnly)
{
if (operations == null)
{
SessionClientEx.Validate(results, diagnostics, requested);
return;
}
if (diagnostics == null)
{
diagnostics = new DiagnosticInfoCollection();
}
var resultsWithStatus = results?.ToList();
if (resultsWithStatus == null || (resultsWithStatus.Count == 0 &&
diagnostics.Count == 0))
{
throw new ServiceResultException(StatusCodes.BadUnexpectedError,
"The server returned no results or diagnostics information.");
}
// Add diagnostics
var ids = requested?.ToArray() ?? new T[0];
for (var index = resultsWithStatus.Count; index < diagnostics.Count; index++)
{
resultsWithStatus.Add(diagnostics[index] == null ?
StatusCodes.Good : StatusCodes.BadUnexpectedError);
}
operations.AddRange(results
.Select((status, index) => new OperationResultModel {
Operation = index < ids.Length ? $"{operation}_{ids[index]}" : operation,
DiagnosticsInfo = index < diagnostics.Count ? diagnostics[index] : null,
StatusCode = status,
TraceOnly = traceOnly
})
.Where(o => o.StatusCode != StatusCodes.Good || o.DiagnosticsInfo != null));
}