/// <summary>
/// This Service returns the Endpoints supported by a Server and all of the configuration information required to establish a SecureChannel and a Session.
/// </summary>
/// <param name="request">a request.</param>
/// <returns>A <see cref="Task"/> representing the asynchronous operation.</returns>
public static async Task<GetEndpointsResponse> GetEndpointsAsync(GetEndpointsRequest request)
{
if (request == null)
{
throw new ArgumentNullException("request");
}
var client = new UaTcpDiscoveryClient(
new EndpointDescription
{
EndpointUrl = request.EndpointUrl,
SecurityMode = MessageSecurityMode.None,
SecurityPolicyUri = SecurityPolicyUris.None
});
try
{
await client.OpenAsync().ConfigureAwait(false);
var response = await client.innerChannel.RequestAsync(request).ConfigureAwait(false);
await client.CloseAsync().ConfigureAwait(false);
return (GetEndpointsResponse)response;
}
catch (Exception)
{
await client.AbortAsync().ConfigureAwait(false);
throw;
}
}
public async Task ConnnectToAllEndpoints()
{
// get or add application certificate.
var localCertificate = this.localDescription.GetCertificate();
if (localCertificate == null)
{
throw new ServiceResultException(StatusCodes.BadSecurityChecksFailed, "Application certificate is missing.");
}
// discover available endpoints of server.
var getEndpointsRequest = new GetEndpointsRequest
{
EndpointUrl = this.endpointUrl,
ProfileUris = new[] { TransportProfileUris.UaTcpTransport }
};
Console.WriteLine($"Discovering endpoints of '{getEndpointsRequest.EndpointUrl}'.");
var getEndpointsResponse = await UaTcpDiscoveryClient.GetEndpointsAsync(getEndpointsRequest);
// for each endpoint and user identity type, try creating a session and reading a few nodes.
foreach (var selectedEndpoint in getEndpointsResponse.Endpoints.OrderBy(e => e.SecurityLevel))
{
foreach (var selectedTokenPolicy in selectedEndpoint.UserIdentityTokens)
{
IUserIdentity selectedUserIdentity;
switch (selectedTokenPolicy.TokenType)
{
case UserTokenType.UserName:
selectedUserIdentity = new UserNameIdentity("root", "secret");
break;
case UserTokenType.Certificate:
selectedUserIdentity = new X509Identity(localCertificate);
break;
default:
selectedUserIdentity = new AnonymousIdentity();
break;
}
var client = new UaTcpSessionClient(
this.localDescription,
localCertificate,
selectedUserIdentity,
selectedEndpoint);
Console.WriteLine($"Creating session with endpoint '{client.RemoteEndpoint.EndpointUrl}'.");
Console.WriteLine($"SecurityPolicy: '{client.RemoteEndpoint.SecurityPolicyUri}'.");
Console.WriteLine($"SecurityMode: '{client.RemoteEndpoint.SecurityMode}'.");
Console.WriteLine($"UserIdentityToken: '{client.UserIdentity}'.");
try
{
await client.OpenAsync();
Console.WriteLine($"Closing session '{client.SessionId}'.");
await client.CloseAsync();
}
catch (Exception ex)
{
Console.WriteLine($"Error opening session '{client.SessionId}'. {ex.Message}");
}
}
}
}
public async Task TestSubscription()
{
// get or add application certificate.
var localCertificate = this.localDescription.GetCertificate();
if (localCertificate == null)
{
throw new ServiceResultException(StatusCodes.BadSecurityChecksFailed, "Application certificate is missing.");
}
// discover available endpoints of server.
var getEndpointsRequest = new GetEndpointsRequest
{
EndpointUrl = this.endpointUrl,
ProfileUris = new[] { TransportProfileUris.UaTcpTransport }
};
Console.WriteLine($"Discovering endpoints of '{getEndpointsRequest.EndpointUrl}'.");
var getEndpointsResponse = await UaTcpDiscoveryClient.GetEndpointsAsync(getEndpointsRequest);
var selectedEndpoint = getEndpointsResponse.Endpoints.OrderBy(e => e.SecurityLevel).Last();
IUserIdentity selectedUserIdentity = new UserNameIdentity("root", "secret");
var session = new UaTcpSessionService(
this.localDescription,
localCertificate,
selectedUserIdentity,
selectedEndpoint);
Console.WriteLine($"Creating session with endpoint '{session.RemoteEndpoint.EndpointUrl}'.");
Console.WriteLine($"SecurityPolicy: '{session.RemoteEndpoint.SecurityPolicyUri}'.");
Console.WriteLine($"SecurityMode: '{session.RemoteEndpoint.SecurityMode}'.");
var sub = new MySubscription(session)
{
PublishingInterval = 1000,
KeepAliveCount = 20,
PublishingEnabled = true
};
Console.WriteLine($"Created subscription.");
await Task.Delay(5000);
Assert.IsTrue(sub.ServerServerStatusCurrentTime != DateTime.MinValue);
session.Dispose();
}
public async Task TransferSubscriptions()
{
// get or add application certificate.
var localCertificate = this.localDescription.GetCertificate();
if (localCertificate == null)
{
throw new ServiceResultException(StatusCodes.BadSecurityChecksFailed, "Application certificate is missing.");
}
// discover available endpoints of server.
var getEndpointsRequest = new GetEndpointsRequest
{
EndpointUrl = this.endpointUrl,
ProfileUris = new[] { TransportProfileUris.UaTcpTransport }
};
Console.WriteLine($"Discovering endpoints of '{getEndpointsRequest.EndpointUrl}'.");
var getEndpointsResponse = await UaTcpDiscoveryClient.GetEndpointsAsync(getEndpointsRequest);
var selectedEndpoint = getEndpointsResponse.Endpoints.OrderBy(e => e.SecurityLevel).Last();
IUserIdentity selectedUserIdentity = new UserNameIdentity("root", "secret");
var client = new UaTcpSessionClient(
this.localDescription,
localCertificate,
selectedUserIdentity,
selectedEndpoint);
Console.WriteLine($"Creating session with endpoint '{client.RemoteEndpoint.EndpointUrl}'.");
Console.WriteLine($"SecurityPolicy: '{client.RemoteEndpoint.SecurityPolicyUri}'.");
Console.WriteLine($"SecurityMode: '{client.RemoteEndpoint.SecurityMode}'.");
await client.OpenAsync();
Console.WriteLine($"Activated session '{client.SessionId}'.");
var req = new CreateSubscriptionRequest
{
RequestedPublishingInterval = 1000,
RequestedMaxKeepAliveCount = 20,
PublishingEnabled = true
};
var res = await client.CreateSubscriptionAsync(req);
Console.WriteLine($"Created subscription '{res.SubscriptionId}'.");
Console.WriteLine($"Aborting session '{client.SessionId}'.");
await client.AbortAsync();
var client2 = new UaTcpSessionClient(
this.localDescription,
localCertificate,
selectedUserIdentity,
selectedEndpoint);
await client2.OpenAsync();
Console.WriteLine($"Activated session '{client2.SessionId}'.");
var req2 = new TransferSubscriptionsRequest
{
SubscriptionIds = new[] { res.SubscriptionId }
};
var res2 = await client2.TransferSubscriptionsAsync(req2);
Console.WriteLine($"Transferred subscription result '{res2.Results[0].StatusCode}'.");
Assert.IsTrue(StatusCode.IsGood(res2.Results[0].StatusCode));
Console.WriteLine($"Closing session '{client2.SessionId}'.");
await client2.CloseAsync();
}
public async Task SessionTimeoutCausesFault()
{
// get or add application certificate.
var localCertificate = this.localDescription.GetCertificate();
if (localCertificate == null)
{
throw new ServiceResultException(StatusCodes.BadSecurityChecksFailed, "Application certificate is missing.");
}
// discover available endpoints of server.
var getEndpointsRequest = new GetEndpointsRequest
{
EndpointUrl = this.endpointUrl,
ProfileUris = new[] { TransportProfileUris.UaTcpTransport }
};
Console.WriteLine($"Discovering endpoints of '{getEndpointsRequest.EndpointUrl}'.");
var getEndpointsResponse = await UaTcpDiscoveryClient.GetEndpointsAsync(getEndpointsRequest);
var selectedEndpoint = getEndpointsResponse.Endpoints.OrderBy(e => e.SecurityLevel).Last();
var selectedTokenType = selectedEndpoint.UserIdentityTokens[0].TokenType;
IUserIdentity selectedUserIdentity;
switch (selectedTokenType)
{
case UserTokenType.UserName:
selectedUserIdentity = new UserNameIdentity("root", "secret");
break;
case UserTokenType.Certificate:
selectedUserIdentity = new X509Identity(localCertificate);
break;
default:
selectedUserIdentity = new AnonymousIdentity();
break;
}
var client = new UaTcpSessionClient(
this.localDescription,
localCertificate,
selectedUserIdentity,
selectedEndpoint)
{
SessionTimeout = 10000
};
Console.WriteLine($"Creating session with endpoint '{client.RemoteEndpoint.EndpointUrl}'.");
Console.WriteLine($"SecurityPolicy: '{client.RemoteEndpoint.SecurityPolicyUri}'.");
Console.WriteLine($"SecurityMode: '{client.RemoteEndpoint.SecurityMode}'.");
await client.OpenAsync();
Console.WriteLine($"Activated session '{client.SessionId}'.");
// server should close session due to inactivity
await Task.Delay(20000);
// should throw exception
var readRequest = new ReadRequest { NodesToRead = new[] { new ReadValueId { NodeId = NodeId.Parse(VariableIds.Server_ServerStatus_CurrentTime), AttributeId = AttributeIds.Value } } };
await client.ReadAsync(readRequest);
Console.WriteLine($"Closing session '{client.SessionId}'.");
await client.CloseAsync();
}
/// <summary>
/// Opens the session with the remote endpoint.
/// </summary>
/// <param name="cancellationToken">A cancellation token.</param>
/// <returns>A task.</returns>
private async Task OpenSessionAsync(CancellationToken cancellationToken = default(CancellationToken))
{
await this.semaphore.WaitAsync(cancellationToken).ConfigureAwait(false);
try
{
if (this.RemoteEndpoint == null)
{
// If specific endpoint is not provided, use discovery to select endpoint with highest
// security level.
try
{
Log.Info($"Discovering endpoints of '{this.discoveryUrl}'.");
var getEndpointsRequest = new GetEndpointsRequest
{
EndpointUrl = this.discoveryUrl,
ProfileUris = new[] { TransportProfileUris.UaTcpTransport }
};
var getEndpointsResponse = await UaTcpDiscoveryClient.GetEndpointsAsync(getEndpointsRequest);
if (getEndpointsResponse.Endpoints == null || getEndpointsResponse.Endpoints.Length == 0)
{
throw new InvalidOperationException($"'{this.discoveryUrl}' returned no endpoints.");
}
this.RemoteEndpoint = getEndpointsResponse.Endpoints.OrderBy(e => e.SecurityLevel).Last();
}
catch (Exception ex)
{
Log.Warn($"Error discovering endpoints of '{this.discoveryUrl}'. {ex.Message}");
throw;
}
}
// throw here to exit state machine.
cancellationToken.ThrowIfCancellationRequested();
try
{
Log.Info($"Opening UaTcpSessionChannel with endpoint '{this.RemoteEndpoint.EndpointUrl}'.");
this.innerChannel = new UaTcpSessionChannel(this.LocalDescription, this.LocalCertificate, this.UserIdentity, this.RemoteEndpoint)
{
SessionTimeout = this.SessionTimeout,
TimeoutHint = this.TimeoutHint,
DiagnosticsHint = this.DiagnosticsHint,
LocalSendBufferSize = this.LocalSendBufferSize,
LocalReceiveBufferSize = this.LocalReceiveBufferSize,
LocalMaxMessageSize = this.LocalMaxMessageSize,
LocalMaxChunkCount = this.LocalMaxChunkCount,
};
await this.innerChannel.OpenAsync(cancellationToken);
}
catch (Exception ex)
{
Log.Warn($"Error opening UaTcpSessionChannel with endpoint '{this.RemoteEndpoint.EndpointUrl}'. {ex.Message}");
throw;
}
}
finally
{
this.semaphore.Release();
}
}
