/// <summary>
/// Test alert condition for nodes
/// </summary>
/// <param name="searchSpan"></param>
/// <param name="appUri"></param>
/// <param name="topologyNode"></param>
/// <param name="node"></param>
public async Task <ContosoPerformanceStatus> CheckAlert(DateTimeRange searchSpan, string appUri, ContosoTopologyNode topologyNode, ContosoOpcUaNode node)
{
double value = await _opcUaQueries.GetLatestQuery(searchSpan.To, appUri, node.NodeId);
// Check for an alert condition.
if (node.Minimum != null && value < node.Minimum)
{
// Add an alert to the server this OPC UA node belongs to.
ContosoAlert alert = new ContosoAlert(ContosoAlertCause.AlertCauseValueBelowMinimum, appUri, node.NodeId, searchSpan.To);
topologyNode.AddAlert(alert);
node.Status = ContosoPerformanceStatus.Poor;
}
else if (node.Maximum != null && value > node.Maximum)
{
// Add an alert to the server this OPC UA node belongs to.
ContosoAlert alert = new ContosoAlert(ContosoAlertCause.AlertCauseValueAboveMaximum, appUri, node.NodeId, searchSpan.To);
topologyNode.AddAlert(alert);
node.Status = ContosoPerformanceStatus.Poor;
}
else
{
node.Status = ContosoPerformanceStatus.Good;
}
return(node.Status);
}
public string AlertActionExecute(long alertId, int alertActionId)
{
var jsonResponse = new List <object>();
try
{
// Lookup the alert.
ContosoAlert alert = Startup.Topology.FindAlert(alertId);
if (alert != null)
{
// Validate the action id.
ContosoTopologyNode topologyNode = Startup.Topology[alert.Key] as ContosoTopologyNode;
List <ContosoAlertActionDefinition> alertActions = topologyNode.GetAlertActions(alert.Cause, alert.SubKey);
if (alertActions == null || alertActionId >= alertActions.Count)
{
Trace.TraceError($"alertActionId '{alertActionId}' is out of scope or unknown.");
Response.StatusCode = 1;
jsonResponse.Add(new { errorMessage = Strings.AlertIdUnknown });
}
else
{
bool updateSessionAlerts = false;
// Process the requested action.
switch (alertActions[alertActionId].Type)
{
case ContosoAlertActionType.AcknowledgeAlert:
// Update alert status.
if (topologyNode.AcknowledgeAlert(alertId) == false)
{
Trace.TraceError(
$"alertId '{alertId}' in node '{topologyNode.Key}' could not be acknowledged.");
Response.StatusCode = 1;
jsonResponse.Add(new { errorMessage = Strings.AlertIdUnknown });
}
updateSessionAlerts = true;
jsonResponse.Add(new { actionType = ContosoAlertActionType.AcknowledgeAlert });
break;
case ContosoAlertActionType.CloseAlert:
// Update alert status.
if (topologyNode.CloseAlert(alertId) == false)
{
Trace.TraceError(
$"alertId '{alertId}' in node '{topologyNode.Key}' could not be acknowledged.");
Response.StatusCode = 1;
jsonResponse.Add(new { errorMessage = Strings.AlertIdUnknown });
}
updateSessionAlerts = true;
jsonResponse.Add(new { actionType = ContosoAlertActionType.CloseAlert });
break;
case ContosoAlertActionType.CallOpcMethod:
// Validate that this is a OPC UA server.
if (topologyNode.GetType() != typeof(Station))
{
Trace.TraceError($"Toplogy node '{topologyNode.Key}' is not an OPC UA server. No method call possible.");
Response.StatusCode = 1;
jsonResponse.Add(new { errorMessage = Strings.AlertIdUnknown });
break;
}
// Parameter format: "<parent nodeId>, <method nodeId>, <opcua server uri>"
string[] parameter = alertActions[alertActionId].Parameter.Split(',');
jsonResponse.Add(new { errorMessage = CallOpcMethod(parameter[2].Trim(), parameter[0].Trim(), parameter[1].Trim()) });
break;
case ContosoAlertActionType.OpenWebPage:
jsonResponse.Add(new { actionType = ContosoAlertActionType.OpenWebPage });
string urlPath = alertActions[alertActionId].Parameter;
jsonResponse.Add(new { url = urlPath });
break;
case ContosoAlertActionType.None:
default:
Trace.TraceWarning($"alert type '{alertActions[alertActionId].Type}' of alert '{alertId}' resulted in no action.");
break;
}
// Update session alerts if requested.
if (updateSessionAlerts)
{
// Prepare the updated alert list.
AlertDataUpdate[] sessionAlertDataUpdate = new AlertDataUpdate[Startup.SessionList.Count];
int sessionUpdateIndex = 0;
foreach (KeyValuePair <string, DashboardModel> session in Startup.SessionList)
{
AlertDataUpdate sessionAlertData = new AlertDataUpdate();
string topNodeKey = session.Value.TopNode.Key;
// Update the alert data.
sessionAlertData.SessionId = Session.SessionID;
sessionAlertData.TopNode = topNodeKey;
sessionAlertData.Alerts = Startup.Topology.GetAlerts(topNodeKey);
// Update the data sent to the clients.
sessionAlertDataUpdate[sessionUpdateIndex] = sessionAlertData;
sessionUpdateIndex++;
}
// Update all clients
string sessionAlertDataUpdateJson = JsonConvert.SerializeObject(sessionAlertDataUpdate);
if (Startup.SessionList.Count > 0 && sessionUpdateIndex > 0)
{
IHubContext hubContext = GlobalHost.ConnectionManager.GetHubContext <TelemetryHub>();
hubContext.Clients.All.updateSessionAlertData(sessionAlertDataUpdateJson);
}
}
}
}
else
{
Trace.TraceError($"alertId '{alertId}' is out of scope or unknown.");
Response.StatusCode = 1;
jsonResponse.Add(new { errorMessage = Strings.AlertIdUnknown });
}
}
catch (Exception ex)
{
Trace.TraceError($"exception '{ex.Message}' while processing alertId '{alertId}' and alertActionId '{alertActionId}");
Response.StatusCode = 1;
jsonResponse.Add(new { errorMessage = Strings.AlertIdUnknown });
}
return(JsonConvert.SerializeObject(jsonResponse));
}
