/// <summary>
/// Creates a new transport channel that supports the IRegistrationChannel service contract.
/// </summary>
/// <param name="configuration">The application configuration.</param>
/// <param name="description">The description for the endpoint.</param>
/// <param name="endpointConfiguration">The configuration to use with the endpoint.</param>
/// <param name="clientCertificate">The client certificate.</param>
/// <param name="messageContext">The message context to use when serializing the messages.</param>
/// <returns></returns>
public static ITransportChannel Create(
ApplicationConfiguration configuration,
EndpointDescription description,
EndpointConfiguration endpointConfiguration,
X509Certificate2 clientCertificate,
ServiceMessageContext messageContext)
{
// create a UA binary channel.
ITransportChannel channel = CreateUaBinaryChannel(
configuration,
description,
endpointConfiguration,
clientCertificate,
messageContext);
// create a WCF XML channel.
if (channel == null)
{
Uri endpointUrl = new Uri(description.EndpointUrl);
channel = new RegistrationChannel();
TransportChannelSettings settings = new TransportChannelSettings();
settings.Configuration = endpointConfiguration;
settings.Description = description;
settings.ClientCertificate = clientCertificate;
channel.Initialize(endpointUrl, settings);
}
return channel;
}
/// <summary>
/// Initializes the object with an XML element to parse.
/// </summary>
public XmlDecoder(XmlElement element, ServiceMessageContext context)
{
if (context == null) throw new ArgumentNullException("context");
Initialize();
m_reader = XmlReader.Create(new StringReader(element.OuterXml));
m_context = context;
}
/// <summary>
/// Initializes the object with a XML reader.
/// </summary>
public XmlDecoder(System.Type systemType, XmlReader reader, ServiceMessageContext context)
{
Initialize();
m_reader = reader;
m_context = context;
string ns = null;
string name = null;
if (systemType != null)
{
XmlQualifiedName typeName = EncodeableFactory.GetXmlName(systemType);
ns = typeName.Namespace;
name = typeName.Name;
}
if (ns == null)
{
m_reader.MoveToContent();
ns = m_reader.NamespaceURI;
name = m_reader.Name;
}
int index = name.IndexOf(':');
if (index != -1)
{
name = name.Substring(index + 1);
}
PushNamespace(ns);
BeginField(name, false);
}
/// <summary>
/// Creates a decoder that reads from a stream.
/// </summary>
public BinaryDecoder(Stream stream, ServiceMessageContext context)
{
if (stream == null) throw new ArgumentNullException("stream");
m_istrm = stream;
m_reader = new BinaryReader(m_istrm);
m_context = context;
}
/// <summary>
/// Initializes object with default values.
/// </summary>
public ServerBase()
{
m_messageContext = new ServiceMessageContext();
m_serverError = new ServiceResult(StatusCodes.BadServerHalted);
m_hosts = new List<ServiceHost>();
m_listeners = new List<ITransportListener>();
m_endpoints = null;
m_requestQueue = new RequestQueue(this, 10, 100, 1000);
}
/// <summary>
/// Initializes the object with an XML element to parse.
/// </summary>
public XmlDecoder(XmlElement element, ServiceMessageContext context)
{
#if !SILVERLIGHT
if (context == null) throw new ArgumentNullException("context");
Initialize();
m_reader = new XmlNodeReader(element);
m_context = context;
#endif
}
public JsonDecoder(System.Type systemType, JsonTextReader reader, ServiceMessageContext context)
{
Initialize();
m_context = context;
m_reader = reader;
m_root = ReadObject();
m_stack = new Stack<object>();
m_stack.Push(m_root);
}
public JsonDecoder(string json, ServiceMessageContext context)
{
if (context == null) throw new ArgumentNullException("context");
Initialize();
m_context = context;
m_reader = new JsonTextReader(new StringReader(json));
m_root = ReadObject();
m_stack = new Stack<object>();
m_stack.Push(m_root);
}
/// <summary>
/// Initializes the object with default values.
/// </summary>
public XmlEncoder(ServiceMessageContext context)
{
Initialize();
m_destination = new StringBuilder();
m_context = context;
XmlWriterSettings settings = new XmlWriterSettings();
settings.CheckCharacters = false;
m_writer = XmlWriter.Create(m_destination, settings);
}
/// <summary>
/// Creates an empty factory.
/// </summary>
/// <param name="messageContext">The message context.</param>
public BindingFactory(ServiceMessageContext messageContext)
{
m_bindings = new Dictionary<string, Type>();
AddDefaultBindings(m_bindings);
m_namespaceUris = ServiceMessageContext.GlobalContext.NamespaceUris;
m_factory = ServiceMessageContext.GlobalContext.Factory;
if (messageContext != null)
{
m_namespaceUris = messageContext.NamespaceUris;
m_factory = messageContext.Factory;
}
}
/// <summary>
/// Initializes the object with default values.
/// </summary>
public JsonEncoder(ServiceMessageContext context, bool useReversibleEncoding, StreamWriter writer = null)
{
Initialize();
m_context = context;
UseReversibleEncoding = useReversibleEncoding;
if (writer == null)
{
m_destination = new MemoryStream();
m_writer = new StreamWriter(m_destination, new UTF8Encoding(false));
}
m_writer.Write("{");
}
/// <summary>
/// Creates a new transport channel that supports the ISessionChannel service contract.
/// </summary>
/// <param name="configuration">The application configuration.</param>
/// <param name="description">The description for the endpoint.</param>
/// <param name="endpointConfiguration">The configuration to use with the endpoint.</param>
/// <param name="clientCertificate">The client certificate.</param>
/// <param name="messageContext">The message context to use when serializing the messages.</param>
/// <returns></returns>
public static ITransportChannel Create(
ApplicationConfiguration configuration,
EndpointDescription description,
EndpointConfiguration endpointConfiguration,
X509Certificate2 clientCertificate,
ServiceMessageContext messageContext)
{
// create a UA binary channel.
ITransportChannel channel = CreateUaBinaryChannel(
configuration,
description,
endpointConfiguration,
clientCertificate,
messageContext);
return channel;
}
/// <summary>
/// Initializes the object with a system type to encode and a XML writer.
/// </summary>
public XmlEncoder(XmlQualifiedName root, XmlWriter writer, ServiceMessageContext context)
{
Initialize();
if (writer == null)
{
m_destination = new StringBuilder();
m_writer = XmlWriter.Create(m_destination);
}
else
{
m_destination = null;
m_writer = writer;
}
Initialize(root.Name, root.Namespace);
m_context = context;
}
/// <summary>
/// Creates a new transport channel that supports the ISessionChannel service contract.
/// </summary>
/// <param name="configuration">The application configuration.</param>
/// <param name="description">The description for the endpoint.</param>
/// <param name="endpointConfiguration">The configuration to use with the endpoint.</param>
/// <param name="clientCertificate">The client certificate.</param>
/// <param name="clientCertificateChain">The client certificate chain.</param>
/// <param name="messageContext">The message context to use when serializing the messages.</param>
/// <returns></returns>
public static ITransportChannel Create(
ApplicationConfiguration configuration,
EndpointDescription description,
EndpointConfiguration endpointConfiguration,
X509Certificate2 clientCertificate,
X509Certificate2Collection clientCertificateChain,
ServiceMessageContext messageContext)
{
// create a UA binary channel.
ITransportChannel channel = CreateUaBinaryChannel(
configuration,
description,
endpointConfiguration,
clientCertificate,
clientCertificateChain,
messageContext);
return(channel);
}
/// <summary>
/// Dispatches an incoming binary encoded request.
/// </summary>
/// <param name="request">Request.</param>
/// <returns>Invoke service response message.</returns>
public virtual InvokeServiceResponseMessage InvokeService(InvokeServiceMessage request)
{
IServiceRequest decodedRequest = null;
IServiceResponse response = null;
// create context for request and reply.
ServiceMessageContext context = MessageContext;
try
{
// check for null.
if (request == null || request.InvokeServiceRequest == null)
{
throw new ServiceResultException(StatusCodes.BadDecodingError, Utils.Format("Null message cannot be processed."));
}
// decoding incoming message.
decodedRequest = BinaryDecoder.DecodeMessage(request.InvokeServiceRequest, null, context) as IServiceRequest;
// invoke service.
response = ProcessRequest(decodedRequest);
// encode response.
InvokeServiceResponseMessage outgoing = new InvokeServiceResponseMessage();
outgoing.InvokeServiceResponse = BinaryEncoder.EncodeMessage(response, context);
return(outgoing);
}
catch (Exception e)
{
// create fault.
ServiceFault fault = CreateFault(decodedRequest, e);
// encode fault response.
if (context == null)
{
context = new ServiceMessageContext();
}
InvokeServiceResponseMessage outgoing = new InvokeServiceResponseMessage();
outgoing.InvokeServiceResponse = BinaryEncoder.EncodeMessage(fault, context);
return(outgoing);
}
}
/// <summary>
/// Creates the message context from the configuration.
/// </summary>
/// <returns>A new instance of a ServiceMessageContext object.</returns>
public ServiceMessageContext CreateMessageContext(bool clonedFactory = false)
{
ServiceMessageContext messageContext = new ServiceMessageContext();
if (m_transportQuotas != null)
{
messageContext.MaxArrayLength = m_transportQuotas.MaxArrayLength;
messageContext.MaxByteStringLength = m_transportQuotas.MaxByteStringLength;
messageContext.MaxStringLength = m_transportQuotas.MaxStringLength;
messageContext.MaxMessageSize = m_transportQuotas.MaxMessageSize;
}
messageContext.NamespaceUris = new NamespaceTable();
messageContext.ServerUris = new StringTable();
if (clonedFactory)
{
messageContext.Factory = new EncodeableFactory(EncodeableFactory.GlobalFactory);
}
return(messageContext);
}
/// <summary>
/// Writes the collection to a binary file.
/// </summary>
public void SaveAsBinary(ISystemContext context, Stream ostrm)
{
ServiceMessageContext messageContext = new ServiceMessageContext();
messageContext.NamespaceUris = context.NamespaceUris;
messageContext.ServerUris = context.ServerUris;
messageContext.Factory = context.EncodeableFactory;
BinaryEncoder encoder = new BinaryEncoder(ostrm, messageContext);
encoder.SaveStringTable(context.NamespaceUris);
encoder.SaveStringTable(context.ServerUris);
encoder.WriteInt32(null, this.Count);
for (int ii = 0; ii < this.Count; ii++)
{
NodeState state = this[ii];
state.SaveAsBinary(context, encoder);
}
}
/// <summary>
/// Creates a new transport channel that supports the IDiscoveryChannel service contract.
/// </summary>
/// <param name="discoveryUrl">The discovery URL.</param>
/// <param name="bindingFactory">The binding factory.</param>
/// <param name="endpointConfiguration">The endpoint configuration.</param>
/// <param name="messageContext">The message context.</param>
/// <returns></returns>
public static ITransportChannel Create(
Uri discoveryUrl,
BindingFactory bindingFactory,
EndpointConfiguration endpointConfiguration,
ServiceMessageContext messageContext)
{
// create a dummy description.
EndpointDescription endpoint = new EndpointDescription();
endpoint.EndpointUrl = discoveryUrl.ToString();
endpoint.SecurityMode = MessageSecurityMode.None;
endpoint.SecurityPolicyUri = SecurityPolicies.None;
endpoint.Server.ApplicationUri = endpoint.EndpointUrl;
endpoint.Server.ApplicationType = ApplicationType.DiscoveryServer;
ITransportChannel channel = CreateUaBinaryChannel(
null,
endpoint,
endpointConfiguration,
(System.Security.Cryptography.X509Certificates.X509Certificate2)null,
messageContext);
// create a WCF XML channel.
if (channel == null)
{
Binding binding = bindingFactory.Create(discoveryUrl.Scheme, endpointConfiguration);
DiscoveryChannel wcfXmlChannel = new DiscoveryChannel();
wcfXmlChannel.Initialize(
endpoint,
endpointConfiguration,
binding,
null);
channel = wcfXmlChannel;
}
return(channel);
}
/// <summary>
/// Creates a new transport channel that supports the ISessionChannel service contract.
/// </summary>
/// <param name="configuration">The application configuration.</param>
/// <param name="description">The description for the endpoint.</param>
/// <param name="endpointConfiguration">The configuration to use with the endpoint.</param>
/// <param name="clientCertificate">The client certificate.</param>
/// <param name="messageContext">The message context to use when serializing the messages.</param>
/// <returns></returns>
public static ITransportChannel Create(
ApplicationConfiguration configuration,
EndpointDescription description,
EndpointConfiguration endpointConfiguration,
X509Certificate2 clientCertificate,
ServiceMessageContext messageContext)
{
// create a UA binary channel.
ITransportChannel channel = CreateUaBinaryChannel(
configuration,
description,
endpointConfiguration,
clientCertificate,
messageContext);
#if !SILVERLIGHT
// create a WCF XML channel.
if (channel == null)
{
Uri endpointUrl = new Uri(description.EndpointUrl);
BindingFactory bindingFactory = BindingFactory.Create(configuration, messageContext);
Binding binding = bindingFactory.Create(endpointUrl.Scheme, description, endpointConfiguration);
SessionChannel wcfXmlChannel = new SessionChannel();
wcfXmlChannel.Initialize(
configuration,
description,
endpointConfiguration,
binding,
clientCertificate,
null);
channel = wcfXmlChannel;
}
#endif
return channel;
}
/// <summary>
/// Creates a new transport channel that supports the ISessionChannel service contract.
/// </summary>
/// <param name="configuration">The application configuration.</param>
/// <param name="description">The description for the endpoint.</param>
/// <param name="endpointConfiguration">The configuration to use with the endpoint.</param>
/// <param name="clientCertificate">The client certificate.</param>
/// <param name="messageContext">The message context to use when serializing the messages.</param>
/// <returns></returns>
public static ITransportChannel Create(
ApplicationConfiguration configuration,
EndpointDescription description,
EndpointConfiguration endpointConfiguration,
X509Certificate2 clientCertificate,
ServiceMessageContext messageContext)
{
// create a UA binary channel.
ITransportChannel channel = CreateUaBinaryChannel(
configuration,
description,
endpointConfiguration,
clientCertificate,
messageContext);
#if !SILVERLIGHT
// create a WCF XML channel.
if (channel == null)
{
Uri endpointUrl = new Uri(description.EndpointUrl);
BindingFactory bindingFactory = BindingFactory.Create(configuration, messageContext);
Binding binding = bindingFactory.Create(endpointUrl.Scheme, description, endpointConfiguration);
SessionChannel wcfXmlChannel = new SessionChannel();
wcfXmlChannel.Initialize(
configuration,
description,
endpointConfiguration,
binding,
clientCertificate,
null);
channel = wcfXmlChannel;
}
#endif
return(channel);
}
/// <summary>
/// Creates a new transport channel that supports the ISessionChannel service contract.
/// </summary>
/// <param name="discoveryUrl">The discovery url.</param>
/// <param name="endpointConfiguration">The configuration to use with the endpoint.</param>
/// <param name="messageContext">The message context to use when serializing the messages.</param>
/// <returns></returns>
public static ITransportChannel Create(
Uri discoveryUrl,
EndpointConfiguration endpointConfiguration,
ServiceMessageContext messageContext)
{
// create a dummy description.
EndpointDescription endpoint = new EndpointDescription();
endpoint.EndpointUrl = discoveryUrl.ToString();
endpoint.SecurityMode = MessageSecurityMode.None;
endpoint.SecurityPolicyUri = SecurityPolicies.None;
endpoint.Server.ApplicationUri = endpoint.EndpointUrl;
endpoint.Server.ApplicationType = ApplicationType.DiscoveryServer;
ITransportChannel channel = CreateUaBinaryChannel(
null,
endpoint,
endpointConfiguration,
(System.Security.Cryptography.X509Certificates.X509Certificate2)null,
messageContext);
return(channel);
}
/// <summary>
/// Provides the ability to change run-time property values or insert custom extension objects such as error handlers, message or parameter interceptors, security extensions, and other custom extension objects.
/// </summary>
/// <param name="serviceDescription">The service description.</param>
/// <param name="serviceHostBase">The host that is currently being built.</param>
public void ApplyDispatchBehavior(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase)
{
ServiceMessageContext contextToUse = null;
Opc.Ua.ServiceHost serviceHost = serviceHostBase as Opc.Ua.ServiceHost;
if (serviceHost == null)
{
contextToUse = ServiceMessageContext.GlobalContext;
}
else
{
contextToUse = serviceHost.Server.MessageContext;
}
foreach (ChannelDispatcher dispatcher in serviceHostBase.ChannelDispatchers)
{
foreach (EndpointDispatcher endpoint in dispatcher.Endpoints)
{
endpoint.DispatchRuntime.MessageInspectors.Add(new ServiceMessageContextMessageInspector(contextToUse));
}
}
}
/// <summary>
/// Writes the schema information to a static XML export file.
/// </summary>
public void SaveAsXml(ISystemContext context, Stream ostrm, bool keepStreamOpen)
{
XmlWriterSettings settings = new XmlWriterSettings();
settings.Encoding = Encoding.UTF8;
settings.CloseOutput = !keepStreamOpen;
settings.ConformanceLevel = ConformanceLevel.Document;
settings.Indent = true;
ServiceMessageContext messageContext = new ServiceMessageContext();
messageContext.NamespaceUris = context.NamespaceUris;
messageContext.ServerUris = context.ServerUris;
messageContext.Factory = context.EncodeableFactory;
using (XmlWriter writer = XmlWriter.Create(ostrm, settings))
{
XmlQualifiedName root = new XmlQualifiedName("ListOfNodeState", Namespaces.OpcUaXsd);
XmlEncoder encoder = new XmlEncoder(root, writer, messageContext);
encoder.SaveStringTable("NamespaceUris", "NamespaceUri", context.NamespaceUris);
encoder.SaveStringTable("ServerUris", "ServerUri", context.ServerUris);
for (int ii = 0; ii < this.Count; ii++)
{
NodeState state = this[ii];
if (state != null)
{
state.SaveAsXml(context, encoder);
}
}
encoder.Close();
}
}
/// <summary>
/// Initializes the object with the message context to use.
/// </summary>
/// <param name="messageContext">The message context.</param>
public ServiceMessageContextMessageInspector(ServiceMessageContext messageContext)
{
m_messageContext = messageContext;
}
/// <summary>
/// Creates a new UA-binary transport channel if requested. Null otherwise.
/// </summary>
/// <param name="configuration">The application configuration.</param>
/// <param name="description">The description for the endpoint.</param>
/// <param name="endpointConfiguration">The configuration to use with the endpoint.</param>
/// <param name="clientCertificate">The client certificate.</param>
/// <param name="messageContext">The message context to use when serializing the messages.</param>
/// <returns></returns>
public static ITransportChannel CreateUaBinaryChannel(
ApplicationConfiguration configuration,
EndpointDescription description,
EndpointConfiguration endpointConfiguration,
X509Certificate2 clientCertificate,
ServiceMessageContext messageContext)
{
// check if the server if configured to use the ANSI C stack.
bool useUaTcp = description.EndpointUrl.StartsWith(Utils.UriSchemeOpcTcp);
bool useHttps = description.EndpointUrl.StartsWith(Utils.UriSchemeHttps);
bool useAnsiCStack = false;
switch (description.TransportProfileUri)
{
case Profiles.UaTcpTransport:
{
useUaTcp = true;
if (configuration != null)
{
useAnsiCStack = configuration.UseNativeStack;
}
break;
}
case Profiles.HttpsXmlTransport:
case Profiles.HttpsBinaryTransport:
case Profiles.HttpsXmlOrBinaryTransport:
{
useHttps = true;
break;
}
}
// note: WCF channels are not supported
if (!useUaTcp && !useHttps)
{
throw ServiceResultException.Create(
StatusCodes.BadServiceUnsupported,
"Unsupported transport profile\r\n");
}
// initialize the channel which will be created with the server.
ITransportChannel channel = null;
// create a UA-TCP channel.
TransportChannelSettings settings = new TransportChannelSettings();
settings.Description = description;
settings.Configuration = endpointConfiguration;
settings.ClientCertificate = clientCertificate;
if (description.ServerCertificate != null && description.ServerCertificate.Length > 0)
{
settings.ServerCertificate = Utils.ParseCertificateBlob(description.ServerCertificate);
}
if (configuration != null)
{
settings.CertificateValidator = configuration.CertificateValidator.GetChannelValidator();
}
settings.NamespaceUris = messageContext.NamespaceUris;
settings.Factory = messageContext.Factory;
if (useUaTcp)
{
Type type = null;
if (useAnsiCStack)
{
type = Type.GetType("Opc.Ua.NativeStack.NativeStackChannel,Opc.Ua.NativeStackWrapper");
}
if (useAnsiCStack && type != null)
{
channel = (ITransportChannel)Activator.CreateInstance(type);
}
else
{
channel = new Opc.Ua.Bindings.TcpTransportChannel();
}
}
else if (useHttps)
{
channel = new Opc.Ua.Bindings.HttpsTransportChannel();
}
channel.Initialize(new Uri(description.EndpointUrl), settings);
channel.Open();
return(channel);
}
/// <summary>
/// Creates a binding table from the bindings specified in the application configuration.
/// </summary>
public static BindingFactory Create(ApplicationConfiguration configuration, ServiceMessageContext context)
{
if (configuration == null || configuration.TransportConfigurations == null || configuration.TransportConfigurations.Count == 0)
{
return new BindingFactory(context.NamespaceUris, context.Factory);
}
BindingFactory table = new BindingFactory(context.NamespaceUris, context.Factory);
foreach (TransportConfiguration entry in configuration.TransportConfigurations)
{
if (entry.TypeName == Utils.UaTcpBindingDefault)
{
continue;
}
Type type = Type.GetType(entry.TypeName);
if (type == null)
{
throw ServiceResultException.Create(StatusCodes.BadConfigurationError, "Could not find binding type '{0}'.", entry.TypeName);
}
table.Add(entry.UriScheme, type);
}
return table;
}
/// <summary>
/// Initializes the object with default values.
/// </summary>
public XmlDecoder(ServiceMessageContext context)
{
if (context == null) throw new ArgumentNullException("context");
Initialize();
m_context = context;
}
/// <summary>
/// Creates a new UA-binary transport channel if requested. Null otherwise.
/// </summary>
/// <param name="configuration">The application configuration.</param>
/// <param name="description">The description for the endpoint.</param>
/// <param name="endpointConfiguration">The configuration to use with the endpoint.</param>
/// <param name="clientCertificate">The client certificate.</param>
/// <param name="clientCertificateChain">The client certificate chain.</param>
/// <param name="messageContext">The message context to use when serializing the messages.</param>
/// <returns></returns>
public static ITransportChannel CreateUaBinaryChannel(
ApplicationConfiguration configuration,
EndpointDescription description,
EndpointConfiguration endpointConfiguration,
X509Certificate2 clientCertificate,
X509Certificate2Collection clientCertificateChain,
ServiceMessageContext messageContext)
{
string uriScheme = new Uri(description.EndpointUrl).Scheme;
switch (description.TransportProfileUri)
{
case Profiles.UaTcpTransport:
{
uriScheme = Utils.UriSchemeOpcTcp;
break;
}
case Profiles.HttpsBinaryTransport:
{
uriScheme = Utils.UriSchemeHttps;
break;
}
case Profiles.UaWssTransport:
{
uriScheme = Utils.UriSchemeOpcWss;
break;
}
}
// initialize the channel which will be created with the server.
ITransportChannel channel = TransportBindings.Channels.GetChannel(uriScheme);
if (channel == null)
{
throw ServiceResultException.Create(
StatusCodes.BadProtocolVersionUnsupported,
"Unsupported transport profile for scheme {0}.", uriScheme);
}
// create a UA-TCP channel.
TransportChannelSettings settings = new TransportChannelSettings {
Description = description,
Configuration = endpointConfiguration,
ClientCertificate = clientCertificate,
ClientCertificateChain = clientCertificateChain
};
if (description.ServerCertificate != null && description.ServerCertificate.Length > 0)
{
settings.ServerCertificate = Utils.ParseCertificateBlob(description.ServerCertificate);
}
if (configuration != null)
{
settings.CertificateValidator = configuration.CertificateValidator.GetChannelValidator();
}
settings.NamespaceUris = messageContext.NamespaceUris;
settings.Factory = messageContext.Factory;
channel.Initialize(new Uri(description.EndpointUrl), settings);
channel.Open();
return(channel);
}
/// <summary>
/// Initializes the object with a system type to encode and a XML writer.
/// </summary>
public XmlEncoder(System.Type systemType, XmlWriter writer, ServiceMessageContext context)
:
this(EncodeableFactory.GetXmlName(systemType), writer, context)
{
}
/// <summary>
/// Reads the schema information from a XML document.
/// </summary>
public void LoadFromBinary(ISystemContext context, Stream istrm, bool updateTables)
{
ServiceMessageContext messageContext = new ServiceMessageContext();
messageContext.NamespaceUris = context.NamespaceUris;
messageContext.ServerUris = context.ServerUris;
messageContext.Factory = context.EncodeableFactory;
using (BinaryDecoder decoder = new BinaryDecoder(istrm, messageContext))
{
// check if a namespace table was provided.
NamespaceTable namespaceUris = new NamespaceTable();
if (!decoder.LoadStringTable(namespaceUris))
{
namespaceUris = null;
}
// update namespace table.
if (updateTables)
{
if (namespaceUris != null && context.NamespaceUris != null)
{
for (int ii = 0; ii < namespaceUris.Count; ii++)
{
context.NamespaceUris.GetIndexOrAppend(namespaceUris.GetString((uint)ii));
}
}
}
// check if a server uri table was provided.
StringTable serverUris = new StringTable();
if (namespaceUris != null && namespaceUris.Count > 1)
{
serverUris.Append(namespaceUris.GetString(1));
}
if (!decoder.LoadStringTable(serverUris))
{
serverUris = null;
}
// update server table.
if (updateTables)
{
if (serverUris != null && context.ServerUris != null)
{
for (int ii = 0; ii < serverUris.Count; ii++)
{
context.ServerUris.GetIndexOrAppend(serverUris.GetString((uint)ii));
}
}
}
// setup the mappings to use during decoding.
decoder.SetMappingTables(namespaceUris, serverUris);
int count = decoder.ReadInt32(null);
for (int ii = 0; ii < count; ii++)
{
NodeState state = NodeState.LoadNode(context, decoder);
this.Add(state);
}
}
}
/// <summary>
/// Creates a new transport channel that supports the ISessionChannel service contract.
/// </summary>
/// <param name="discoveryUrl">The discovery url.</param>
/// <param name="endpointConfiguration">The configuration to use with the endpoint.</param>
/// <param name="messageContext">The message context to use when serializing the messages.</param>
/// <returns></returns>
public static ITransportChannel Create(
Uri discoveryUrl,
EndpointConfiguration endpointConfiguration,
ServiceMessageContext messageContext)
{
// create a dummy description.
EndpointDescription endpoint = new EndpointDescription();
endpoint.EndpointUrl = discoveryUrl.ToString();
endpoint.SecurityMode = MessageSecurityMode.None;
endpoint.SecurityPolicyUri = SecurityPolicies.None;
endpoint.Server.ApplicationUri = endpoint.EndpointUrl;
endpoint.Server.ApplicationType = ApplicationType.DiscoveryServer;
ITransportChannel channel = CreateUaBinaryChannel(
null,
endpoint,
endpointConfiguration,
(System.Security.Cryptography.X509Certificates.X509Certificate2)null,
messageContext);
return channel;
}
/// <summary>
/// Dispatches an incoming binary encoded request.
/// </summary>
/// <param name="request">Request.</param>
/// <returns>Invoke service response message.</returns>
public virtual InvokeServiceResponseMessage InvokeService(InvokeServiceMessage request)
{
IServiceRequest decodedRequest = null;
IServiceResponse response = null;
// create context for request and reply.
ServiceMessageContext context = MessageContext;
try
{
// check for null.
if (request == null || request.InvokeServiceRequest == null)
{
throw new ServiceResultException(StatusCodes.BadDecodingError, Utils.Format("Null message cannot be processed."));
}
// decoding incoming message.
decodedRequest = BinaryDecoder.DecodeMessage(request.InvokeServiceRequest, null, context) as IServiceRequest;
// invoke service.
response = ProcessRequest(decodedRequest);
// encode response.
InvokeServiceResponseMessage outgoing = new InvokeServiceResponseMessage();
outgoing.InvokeServiceResponse = BinaryEncoder.EncodeMessage(response, context);
return outgoing;
}
catch (Exception e)
{
// create fault.
ServiceFault fault = CreateFault(decodedRequest, e);
// encode fault response.
if (context == null)
{
context = new ServiceMessageContext();
}
InvokeServiceResponseMessage outgoing = new InvokeServiceResponseMessage();
outgoing.InvokeServiceResponse = BinaryEncoder.EncodeMessage(fault, context);
return outgoing;
}
}
/// <summary>
/// Creates a new UA-binary transport channel if requested. Null otherwise.
/// </summary>
/// <param name="configuration">The application configuration.</param>
/// <param name="description">The description for the endpoint.</param>
/// <param name="endpointConfiguration">The configuration to use with the endpoint.</param>
/// <param name="clientCertificate">The client certificate.</param>
/// <param name="clientCertificateChain">The client certificate chain.</param>
/// <param name="messageContext">The message context to use when serializing the messages.</param>
/// <returns></returns>
public static ITransportChannel CreateUaBinaryChannel(
ApplicationConfiguration configuration,
EndpointDescription description,
EndpointConfiguration endpointConfiguration,
X509Certificate2 clientCertificate,
X509Certificate2Collection clientCertificateChain,
ServiceMessageContext messageContext)
{
bool useUaTcp = description.EndpointUrl.StartsWith(Utils.UriSchemeOpcTcp);
bool useHttps = description.EndpointUrl.StartsWith(Utils.UriSchemeHttps);
switch (description.TransportProfileUri)
{
case Profiles.UaTcpTransport:
{
useUaTcp = true;
break;
}
case Profiles.HttpsBinaryTransport:
{
useHttps = true;
break;
}
}
// note: WCF channels are not supported
if (!useUaTcp
#if !NO_HTTPS
&& !useHttps
#endif
)
{
throw ServiceResultException.Create(
StatusCodes.BadProtocolVersionUnsupported,
"Unsupported transport profile\r\n");
}
// initialize the channel which will be created with the server.
ITransportChannel channel = null;
// create a UA-TCP channel.
TransportChannelSettings settings = new TransportChannelSettings();
settings.Description = description;
settings.Configuration = endpointConfiguration;
settings.ClientCertificate = clientCertificate;
settings.ClientCertificateChain = clientCertificateChain;
if (description.ServerCertificate != null && description.ServerCertificate.Length > 0)
{
settings.ServerCertificate = Utils.ParseCertificateBlob(description.ServerCertificate);
}
if (configuration != null)
{
settings.CertificateValidator = configuration.CertificateValidator.GetChannelValidator();
}
settings.NamespaceUris = messageContext.NamespaceUris;
settings.Factory = messageContext.Factory;
if (useUaTcp)
{
if (g_CustomTransportChannel != null)
{
channel = g_CustomTransportChannel.Create();
}
else
{
channel = new TcpTransportChannel();
}
}
else if (useHttps)
{
#if !NO_HTTPS
channel = new HttpsTransportChannel();
#endif
}
channel.Initialize(new Uri(description.EndpointUrl), settings);
channel.Open();
return(channel);
}
/// <summary>
/// Encodes the object in XML.
/// </summary>
public static XmlElement EncodeXml(IEncodeable encodeable, ServiceMessageContext context)
{
// create encoder.
XmlEncoder encoder = new XmlEncoder(context);
// write body.
encoder.WriteExtensionObjectBody(encodeable);
// create document from encoder.
XmlDocument document = new XmlDocument();
document.InnerXml = encoder.Close();
// return root element.
return document.DocumentElement;
}
/// <summary>
/// Encodes the object in binary
/// </summary>
public static byte[] EncodeBinary(IEncodeable encodeable, ServiceMessageContext context)
{
BinaryEncoder encoder = new BinaryEncoder(context);
encoder.WriteEncodeable(null, encodeable, null);
return encoder.CloseAndReturnBuffer();
}
/// <summary>
/// Applies the data encoding to the value.
/// </summary>
public static ServiceResult ApplyDataEncoding(ServiceMessageContext context, QualifiedName dataEncoding, ref object value)
{
// check if nothing to do.
if (QualifiedName.IsNull(dataEncoding) || value == null)
{
return ServiceResult.Good;
}
// check for supported encoding type.
if (dataEncoding.NamespaceIndex != 0)
{
return StatusCodes.BadDataEncodingUnsupported;
}
bool useXml = dataEncoding.Name == DefaultXml;
if (!useXml && dataEncoding.Name != DefaultBinary)
{
return StatusCodes.BadDataEncodingUnsupported;
}
try
{
// check for array of encodeables.
IList<IEncodeable> encodeables = value as IList<IEncodeable>;
if (encodeables == null)
{
// check for array of extension objects.
IList<ExtensionObject> extensions = value as IList<ExtensionObject>;
if (extensions != null)
{
// convert extension objects to encodeables.
encodeables = new IEncodeable[extensions.Count];
for (int ii = 0; ii < encodeables.Count; ii++)
{
if (ExtensionObject.IsNull(extensions[ii]))
{
encodeables[ii] = null;
continue;
}
IEncodeable element = extensions[ii].Body as IEncodeable;
if (element == null)
{
return StatusCodes.BadTypeMismatch;
}
encodeables[ii] = element;
}
}
}
// apply data encoding to the array.
if (encodeables != null)
{
ExtensionObject[] extensions = new ExtensionObject[encodeables.Count];
for (int ii = 0; ii < extensions.Length; ii++)
{
extensions[ii] = Encode(context, encodeables[ii], useXml);
}
value = extensions;
return ServiceResult.Good;
}
// check for scalar value.
IEncodeable encodeable = value as IEncodeable;
if (encodeable == null)
{
ExtensionObject extension = value as ExtensionObject;
if (extension == null)
{
return StatusCodes.BadDataEncodingUnsupported;
}
encodeable = extension.Body as IEncodeable;
}
if (encodeable == null)
{
return StatusCodes.BadDataEncodingUnsupported;
}
// do conversion.
value = Encode(context, encodeable, useXml);
return ServiceResult.Good;
}
catch (Exception e)
{
return ServiceResult.Create(e, StatusCodes.BadTypeMismatch, "Could not convert value to requested format.");
}
}
/// <summary>
/// Initializes the object with the message context to use.
/// </summary>
/// <param name="messageContext">The message context.</param>
public ServiceMessageContextMessageInspector(ServiceMessageContext messageContext)
{
m_messageContext = messageContext;
}
/// <summary>
/// Creates a decoder that reads from a memory buffer.
/// </summary>
public BinaryDecoder(byte[] buffer, ServiceMessageContext context)
:
this(buffer, 0, buffer.Length, context)
{
}
/// <summary>
/// Creates a new UA-binary transport channel if requested. Null otherwise.
/// </summary>
/// <param name="configuration">The application configuration.</param>
/// <param name="description">The description for the endpoint.</param>
/// <param name="endpointConfiguration">The configuration to use with the endpoint.</param>
/// <param name="clientCertificate">The client certificate.</param>
/// <param name="messageContext">The message context to use when serializing the messages.</param>
/// <returns></returns>
public static ITransportChannel CreateUaBinaryChannel(
ApplicationConfiguration configuration,
EndpointDescription description,
EndpointConfiguration endpointConfiguration,
X509Certificate2 clientCertificate,
ServiceMessageContext messageContext)
{
// check if the server if configured to use the ANSI C stack.
bool useUaTcp = description.EndpointUrl.StartsWith(Utils.UriSchemeOpcTcp);
bool useHttps = description.EndpointUrl.StartsWith(Utils.UriSchemeHttps);
#if !SILVERLIGHT
bool useAnsiCStack = false;
#else
useHttps = description.EndpointUrl.StartsWith(Utils.UriSchemeHttp);
#endif
switch (description.TransportProfileUri)
{
case Profiles.UaTcpTransport:
{
useUaTcp = true;
#if !SILVERLIGHT
if (configuration != null)
{
useAnsiCStack = configuration.UseNativeStack;
}
#endif
break;
}
case Profiles.HttpsXmlTransport:
case Profiles.HttpsBinaryTransport:
case Profiles.HttpsXmlOrBinaryTransport:
{
useHttps = true;
break;
}
}
#if !SILVERLIGHT
// check for a WCF channel.
if (!useUaTcp && !useHttps)
{
// binary channels only need the base class.
if (endpointConfiguration.UseBinaryEncoding)
{
Uri endpointUrl = new Uri(description.EndpointUrl);
BindingFactory bindingFactory = BindingFactory.Create(configuration, messageContext);
Binding binding = bindingFactory.Create(endpointUrl.Scheme, description, endpointConfiguration);
WcfChannelBase<IChannelBase> wcfChannel = new WcfChannelBase<IChannelBase>();
// create regular binding.
if (configuration != null)
{
wcfChannel.Initialize(
configuration,
description,
endpointConfiguration,
binding,
clientCertificate,
null);
}
// create no-security discovery binding.
else
{
wcfChannel.Initialize(
description,
endpointConfiguration,
binding,
null);
}
return wcfChannel;
}
return null;
}
#endif
// initialize the channel which will be created with the server.
ITransportChannel channel = null;
// create a UA-TCP channel.
TransportChannelSettings settings = new TransportChannelSettings();
settings.Description = description;
settings.Configuration = endpointConfiguration;
settings.ClientCertificate = clientCertificate;
if (description.ServerCertificate != null && description.ServerCertificate.Length > 0)
{
settings.ServerCertificate = Utils.ParseCertificateBlob(description.ServerCertificate);
}
#if !SILVERLIGHT
if (configuration != null)
{
settings.CertificateValidator = configuration.CertificateValidator.GetChannelValidator();
}
#endif
settings.NamespaceUris = messageContext.NamespaceUris;
settings.Factory = messageContext.Factory;
if (useUaTcp)
{
#if !SILVERLIGHT
Type type = null;
if (useAnsiCStack)
{
type = Type.GetType("Opc.Ua.NativeStack.NativeStackChannel,Opc.Ua.NativeStackWrapper");
}
if (useAnsiCStack && type != null)
{
channel = (ITransportChannel)Activator.CreateInstance(type);
}
else
{
channel = new Opc.Ua.Bindings.TcpTransportChannel();
}
#endif
}
else if (useHttps)
{
channel = new Opc.Ua.Bindings.HttpsTransportChannel();
}
channel.Initialize(new Uri(description.EndpointUrl), settings);
channel.Open();
return channel;
}
/// <summary>
/// Reads the schema information from a XML document.
/// </summary>
public void LoadFromXml(ISystemContext context, Stream istrm, bool updateTables)
{
ServiceMessageContext messageContext = new ServiceMessageContext();
messageContext.NamespaceUris = context.NamespaceUris;
messageContext.ServerUris = context.ServerUris;
messageContext.Factory = context.EncodeableFactory;
using (XmlReader reader = XmlReader.Create(istrm))
{
XmlQualifiedName root = new XmlQualifiedName("ListOfNodeState", Namespaces.OpcUaXsd);
XmlDecoder decoder = new XmlDecoder(null, reader, messageContext);
NamespaceTable namespaceUris = new NamespaceTable();
if (!decoder.LoadStringTable("NamespaceUris", "NamespaceUri", namespaceUris))
{
namespaceUris = null;
}
// update namespace table.
if (updateTables)
{
if (namespaceUris != null && context.NamespaceUris != null)
{
for (int ii = 0; ii < namespaceUris.Count; ii++)
{
context.NamespaceUris.GetIndexOrAppend(namespaceUris.GetString((uint)ii));
}
}
}
StringTable serverUris = new StringTable();
if (!decoder.LoadStringTable("ServerUris", "ServerUri", context.ServerUris))
{
serverUris = null;
}
// update server table.
if (updateTables)
{
if (serverUris != null && context.ServerUris != null)
{
for (int ii = 0; ii < serverUris.Count; ii++)
{
context.ServerUris.GetIndexOrAppend(serverUris.GetString((uint)ii));
}
}
}
// set mapping.
decoder.SetMappingTables(namespaceUris, serverUris);
decoder.PushNamespace(Namespaces.OpcUaXsd);
NodeState state = NodeState.LoadNode(context, decoder);
while (state != null)
{
this.Add(state);
state = NodeState.LoadNode(context, decoder);
}
decoder.Close();
}
}
/// <summary>
/// Acknowledges the specified context.
/// </summary>
/// <param name="context">The context.</param>
/// <param name="eventId">The event id.</param>
/// <param name="comment">The comment.</param>
/// <returns></returns>
public uint Acknowledge(
ServerSystemContext context,
byte[] eventId,
LocalizedText comment)
{
// get the user name from the context.
string userName = String.Empty;
if (context.UserIdentity != null)
{
userName = context.UserIdentity.DisplayName;
}
// get the comment.
string commentText = String.Empty;
if (comment != null)
{
commentText = comment.Text;
}
System.Runtime.InteropServices.ComTypes.FILETIME ftActiveTime;
// unpack the event id.
ServiceMessageContext messageContext = new ServiceMessageContext();
messageContext.NamespaceUris = context.NamespaceUris;
messageContext.ServerUris = context.ServerUris;
messageContext.Factory = context.EncodeableFactory;
BinaryDecoder decoder = new BinaryDecoder(eventId, messageContext);
string source = decoder.ReadString(null);
string conditionName = decoder.ReadString(null);
ftActiveTime.dwHighDateTime = decoder.ReadInt32(null);
ftActiveTime.dwLowDateTime = decoder.ReadInt32(null);
int cookie = decoder.ReadInt32(null);
decoder.Close();
string methodName = "IOPCEventServer.AckCondition";
IntPtr pErrors = IntPtr.Zero;
try
{
IOPCEventServer server = BeginComCall<IOPCEventServer>(methodName, true);
server.AckCondition(
1,
userName,
commentText,
new string[] { source },
new string[] { conditionName },
new System.Runtime.InteropServices.ComTypes.FILETIME[] { ftActiveTime },
new int[] { cookie },
out pErrors);
}
catch (Exception e)
{
ComCallError(methodName, e);
return StatusCodes.BadUnexpectedError;
}
finally
{
EndComCall(methodName);
}
// unmarshal results.
int[] errors = ComUtils.GetInt32s(ref pErrors, 1, true);
if (errors[0] == ResultIds.S_ALREADYACKED)
{
return StatusCodes.BadConditionBranchAlreadyAcked;
}
else if (errors[0] < 0)
{
return StatusCodes.BadEventIdUnknown;
}
return StatusCodes.Good;
}
/// <summary>
/// Decodes a message from a buffer.
/// </summary>
public static IEncodeable DecodeMessage(byte[] buffer, System.Type expectedType, ServiceMessageContext context)
{
if (buffer == null) throw new ArgumentNullException("buffer");
if (context == null) throw new ArgumentNullException("context");
BinaryDecoder decoder = new BinaryDecoder(buffer, context);
try
{
return decoder.DecodeMessage(expectedType);
}
finally
{
decoder.Close();
}
}
/// <summary>
/// Creates a decoder that reads from a memory buffer.
/// </summary>
public BinaryDecoder(byte[] buffer, int start, int count, ServiceMessageContext context)
{
m_istrm = new MemoryStream(buffer, start, count, false);
m_reader = new BinaryReader(m_istrm);
m_context = context;
}
/// <summary>
/// Applies the data encoding to the value.
/// </summary>
public static ServiceResult ApplyDataEncoding(ServiceMessageContext context, QualifiedName dataEncoding, ref object value)
{
// check if nothing to do.
if (QualifiedName.IsNull(dataEncoding) || value == null)
{
return(ServiceResult.Good);
}
// check for supported encoding type.
if (dataEncoding.NamespaceIndex != 0)
{
return(StatusCodes.BadDataEncodingUnsupported);
}
bool useXml = dataEncoding.Name == DefaultXml;
if (!useXml && dataEncoding.Name != DefaultBinary)
{
return(StatusCodes.BadDataEncodingUnsupported);
}
try
{
// check for array of encodeables.
IList <IEncodeable> encodeables = value as IList <IEncodeable>;
if (encodeables == null)
{
// check for array of extension objects.
IList <ExtensionObject> extensions = value as IList <ExtensionObject>;
if (extensions != null)
{
// convert extension objects to encodeables.
encodeables = new IEncodeable[extensions.Count];
for (int ii = 0; ii < encodeables.Count; ii++)
{
if (ExtensionObject.IsNull(extensions[ii]))
{
encodeables[ii] = null;
continue;
}
IEncodeable element = extensions[ii].Body as IEncodeable;
if (element == null)
{
return(StatusCodes.BadTypeMismatch);
}
encodeables[ii] = element;
}
}
}
// apply data encoding to the array.
if (encodeables != null)
{
ExtensionObject[] extensions = new ExtensionObject[encodeables.Count];
for (int ii = 0; ii < extensions.Length; ii++)
{
extensions[ii] = Encode(context, encodeables[ii], useXml);
}
value = extensions;
return(ServiceResult.Good);
}
// check for scalar value.
IEncodeable encodeable = value as IEncodeable;
if (encodeable == null)
{
ExtensionObject extension = value as ExtensionObject;
if (extension == null)
{
return(StatusCodes.BadDataEncodingUnsupported);
}
encodeable = extension.Body as IEncodeable;
}
if (encodeable == null)
{
return(StatusCodes.BadDataEncodingUnsupported);
}
// do conversion.
value = Encode(context, encodeable, useXml);
return(ServiceResult.Good);
}
catch (Exception e)
{
return(ServiceResult.Create(e, StatusCodes.BadTypeMismatch, "Could not convert value to requested format."));
}
}
/// <summary>
/// Creates an decoder to restore Variant values.
/// </summary>
private XmlDecoder CreateDecoder(ISystemContext context, XmlElement source)
{
ServiceMessageContext messageContext = new ServiceMessageContext();
messageContext.NamespaceUris = context.NamespaceUris;
messageContext.ServerUris = context.ServerUris;
messageContext.Factory = context.EncodeableFactory;
XmlDecoder decoder = new XmlDecoder(source, messageContext);
NamespaceTable namespaceUris = new NamespaceTable();
if (NamespaceUris != null)
{
for (int ii = 0; ii < NamespaceUris.Length; ii++)
{
namespaceUris.Append(NamespaceUris[ii]);
}
}
StringTable serverUris = new StringTable();
if (ServerUris != null)
{
serverUris.Append(context.ServerUris.GetString(0));
for (int ii = 0; ii < ServerUris.Length; ii++)
{
serverUris.Append(ServerUris[ii]);
}
}
decoder.SetMappingTables(namespaceUris, serverUris);
return decoder;
}
/// <summary>
/// Initializes the object with the message context to use.
/// </summary>
public MessageContextExtension(ServiceMessageContext messageContext)
{
m_messageContext = messageContext;
}
/// <summary>
/// Creates a new UA-binary transport channel if requested. Null otherwise.
/// </summary>
/// <param name="configuration">The application configuration.</param>
/// <param name="description">The description for the endpoint.</param>
/// <param name="endpointConfiguration">The configuration to use with the endpoint.</param>
/// <param name="clientCertificate">The client certificate.</param>
/// <param name="messageContext">The message context to use when serializing the messages.</param>
/// <returns></returns>
public static ITransportChannel CreateUaBinaryChannel(
ApplicationConfiguration configuration,
EndpointDescription description,
EndpointConfiguration endpointConfiguration,
X509Certificate2 clientCertificate,
ServiceMessageContext messageContext)
{
// check if the server if configured to use the ANSI C stack.
bool useUaTcp = description.EndpointUrl.StartsWith(Utils.UriSchemeOpcTcp);
bool useHttps = description.EndpointUrl.StartsWith(Utils.UriSchemeHttps);
bool useAnsiCStack = false;
switch (description.TransportProfileUri)
{
case Profiles.UaTcpTransport:
{
useUaTcp = true;
if (configuration != null)
{
useAnsiCStack = configuration.UseNativeStack;
}
break;
}
case Profiles.HttpsXmlTransport:
case Profiles.HttpsBinaryTransport:
case Profiles.HttpsXmlOrBinaryTransport:
{
useHttps = true;
break;
}
}
// note: WCF channels are not supported
if (!useUaTcp && !useHttps)
{
throw ServiceResultException.Create(
StatusCodes.BadServiceUnsupported,
"Unsupported transport profile\r\n");
}
// initialize the channel which will be created with the server.
ITransportChannel channel = null;
// create a UA-TCP channel.
TransportChannelSettings settings = new TransportChannelSettings();
settings.Description = description;
settings.Configuration = endpointConfiguration;
settings.ClientCertificate = clientCertificate;
if (description.ServerCertificate != null && description.ServerCertificate.Length > 0)
{
settings.ServerCertificate = Utils.ParseCertificateBlob(description.ServerCertificate);
}
if (configuration != null)
{
settings.CertificateValidator = configuration.CertificateValidator.GetChannelValidator();
}
settings.NamespaceUris = messageContext.NamespaceUris;
settings.Factory = messageContext.Factory;
if (useUaTcp)
{
Type type = null;
if (useAnsiCStack)
{
type = Type.GetType("Opc.Ua.NativeStack.NativeStackChannel,Opc.Ua.NativeStackWrapper");
}
if (useAnsiCStack && type != null)
{
channel = (ITransportChannel)Activator.CreateInstance(type);
}
else
{
channel = new Opc.Ua.Bindings.TcpTransportChannel();
}
}
else if (useHttps)
{
channel = new Opc.Ua.Bindings.HttpsTransportChannel();
}
channel.Initialize(new Uri(description.EndpointUrl), settings);
channel.Open();
return channel;
}