/// <summary>
/// Updates the configuration file to persist all currently published nodes
/// </summary>
public static async Task UpdateNodeConfigurationFileAsync()
{
try
{
// itereate through all sessions, subscriptions and monitored items and create config file entries
uint nodeConfigVersion = 0;
List <PublisherConfigurationFileEntryModel> publisherNodeConfiguration = GetPublisherConfigurationFileEntries(null, true, out nodeConfigVersion);
// update the config file
try
{
await PublisherNodeConfigurationFileSemaphore.WaitAsync().ConfigureAwait(false);
await File.WriteAllTextAsync(PublisherNodeConfigurationFilename, JsonConvert.SerializeObject(publisherNodeConfiguration, Formatting.Indented)).ConfigureAwait(false);
}
finally
{
PublisherNodeConfigurationFileSemaphore.Release();
}
}
catch (Exception e)
{
Logger.Error(e, "Update of node configuration file failed.");
}
}
/// <summary>
/// Frees resources for the node configuration.
/// </summary>
public static void Deinit()
{
OpcSessions.Clear();
_nodePublishingConfiguration = null;
OpcSessionsListSemaphore.Dispose();
OpcSessionsListSemaphore = null;
PublisherNodeConfigurationSemaphore.Dispose();
PublisherNodeConfigurationSemaphore = null;
PublisherNodeConfigurationFileSemaphore.Dispose();
PublisherNodeConfigurationFileSemaphore = null;
}
/// <summary>
/// Implement IDisposable.
/// </summary>
protected virtual void Dispose(bool disposing)
{
if (disposing)
{
OpcSessionsListSemaphore.Wait();
foreach (var opcSession in OpcSessions)
{
opcSession.Dispose();
}
OpcSessions?.Clear();
OpcSessionsListSemaphore?.Dispose();
OpcSessionsListSemaphore = null;
PublisherNodeConfigurationSemaphore?.Dispose();
PublisherNodeConfigurationSemaphore = null;
PublisherNodeConfigurationFileSemaphore?.Dispose();
PublisherNodeConfigurationFileSemaphore = null;
_nodePublishingConfiguration?.Clear();
_nodePublishingConfiguration = null;
lock (_singletonLock)
{
_instance = null;
}
}
}
/// <summary>
/// Implement IDisposable.
/// </summary>
protected virtual void Dispose(bool disposing)
{
if (disposing)
{
//OpcSessionsListSemaphore.Wait(); avoid get semaphore here, otherwise there will be deadlock during OpcSession disposing
foreach (var opcSession in OpcSessions)
{
opcSession.Dispose();
}
OpcSessions?.Clear();
OpcSessionsListSemaphore?.Dispose();
OpcSessionsListSemaphore = null;
PublisherNodeConfigurationSemaphore?.Dispose();
PublisherNodeConfigurationSemaphore = null;
PublisherNodeConfigurationFileSemaphore?.Dispose();
PublisherNodeConfigurationFileSemaphore = null;
_nodePublishingConfiguration?.Clear();
_nodePublishingConfiguration = null;
lock (_singletonLock)
{
_instance = null;
}
}
}
/// <summary>
/// Read and parse the publisher node configuration file.
/// </summary>
/// <returns></returns>
public static async Task <bool> ReadConfigAsync()
{
// get information on the nodes to publish and validate the json by deserializing it.
try
{
await PublisherNodeConfigurationSemaphore.WaitAsync().ConfigureAwait(false);
if (!string.IsNullOrEmpty(Environment.GetEnvironmentVariable("_GW_PNFP")))
{
Logger.Information("Publishing node configuration file path read from environment.");
PublisherNodeConfigurationFilename = Environment.GetEnvironmentVariable("_GW_PNFP");
}
Logger.Information($"The name of the configuration file for published nodes is: {PublisherNodeConfigurationFilename}");
// if the file exists, read it, if not just continue
if (File.Exists(PublisherNodeConfigurationFilename))
{
Logger.Information($"Attemtping to load node configuration from: {PublisherNodeConfigurationFilename}");
try
{
await PublisherNodeConfigurationFileSemaphore.WaitAsync().ConfigureAwait(false);
_configurationFileEntries = JsonConvert.DeserializeObject <List <PublisherConfigurationFileEntryLegacyModel> >(File.ReadAllText(PublisherNodeConfigurationFilename));
}
finally
{
PublisherNodeConfigurationFileSemaphore.Release();
}
if (_configurationFileEntries != null)
{
Logger.Information($"Loaded {_configurationFileEntries.Count} config file entry/entries.");
foreach (var publisherConfigFileEntryLegacy in _configurationFileEntries)
{
if (publisherConfigFileEntryLegacy.NodeId == null)
{
// new node configuration syntax.
foreach (var opcNode in publisherConfigFileEntryLegacy.OpcNodes)
{
if (opcNode.ExpandedNodeId != null)
{
ExpandedNodeId expandedNodeId = ExpandedNodeId.Parse(opcNode.ExpandedNodeId);
_nodePublishingConfiguration.Add(new NodePublishingConfigurationModel(expandedNodeId, opcNode.ExpandedNodeId, publisherConfigFileEntryLegacy.EndpointUrl.OriginalString, publisherConfigFileEntryLegacy.UseSecurity, opcNode.OpcPublishingInterval, opcNode.OpcSamplingInterval, opcNode.DisplayName));
}
else
{
// check Id string to check which format we have
if (opcNode.Id.StartsWith("nsu=", StringComparison.InvariantCulture))
{
// ExpandedNodeId format
ExpandedNodeId expandedNodeId = ExpandedNodeId.Parse(opcNode.Id);
_nodePublishingConfiguration.Add(new NodePublishingConfigurationModel(expandedNodeId, opcNode.Id, publisherConfigFileEntryLegacy.EndpointUrl.OriginalString, publisherConfigFileEntryLegacy.UseSecurity, opcNode.OpcPublishingInterval, opcNode.OpcSamplingInterval, opcNode.DisplayName));
}
else
{
// NodeId format
NodeId nodeId = NodeId.Parse(opcNode.Id);
_nodePublishingConfiguration.Add(new NodePublishingConfigurationModel(nodeId, opcNode.Id, publisherConfigFileEntryLegacy.EndpointUrl.OriginalString, publisherConfigFileEntryLegacy.UseSecurity, opcNode.OpcPublishingInterval, opcNode.OpcSamplingInterval, opcNode.DisplayName));
}
}
}
}
else
{
// NodeId (ns=) format node configuration syntax using default sampling and publishing interval.
_nodePublishingConfiguration.Add(new NodePublishingConfigurationModel(publisherConfigFileEntryLegacy.NodeId, publisherConfigFileEntryLegacy.NodeId.ToString(), publisherConfigFileEntryLegacy.EndpointUrl.OriginalString, publisherConfigFileEntryLegacy.UseSecurity, null, null, null));
}
}
}
}
else
{
Logger.Information($"The node configuration file '{PublisherNodeConfigurationFilename}' does not exist. Continue and wait for remote configuration requests.");
}
}
catch (Exception e)
{
Logger.Fatal(e, "Loading of the node configuration file failed. Does the file exist and has correct syntax? Exiting...");
return(false);
}
finally
{
PublisherNodeConfigurationSemaphore.Release();
}
Logger.Information($"There are {_nodePublishingConfiguration.Count.ToString(CultureInfo.InvariantCulture)} nodes to publish.");
return(true);
}
