/// <summary cref="IClientMessageInspector.BeforeSendRequest" />
public object BeforeSendRequest(ref System.ServiceModel.Channels.Message request, System.ServiceModel.IClientChannel channel)
{
// extract request body from message object.
IServiceMessage requestBody = (IServiceMessage)request.Properties[MessageProperties.RequestBody];
// extract the request from the message body.
IEncodeable encodeable = requestBody.GetRequest();
byte[] encodedBody = null;
if (!m_transportSupportsEncoding)
{
encodedBody = BinaryEncoder.EncodeMessage(encodeable, m_messageContext);
}
// create encoded message.
Message encodedRequest = Message.CreateMessage(
request.Version,
Namespaces.OpcUaWsdl + "/InvokeService",
new InvokeServiceBodyWriter(encodedBody, true));
encodedRequest.Headers.To = request.Headers.To;
encodedRequest.Headers.MessageId = request.Headers.MessageId;
encodedRequest.Headers.From = request.Headers.From;
if (encodedBody != null)
{
encodedRequest.Properties.Add(MessageProperties.EncodedBody, encodedBody);
}
encodedRequest.Properties.Add(MessageProperties.UnencodedBody, encodeable);
// save information need to process reply.
object correlationState = new object[] { request.Version, request.Headers.Action, requestBody };
// replace the outgoing message.
request = encodedRequest;
return(correlationState);
}
/// <summary cref="IClientMessageInspector.AfterReceiveReply" />
public void AfterReceiveReply(ref System.ServiceModel.Channels.Message reply, object correlationState)
{
// check for fault.
if (reply.IsFault)
{
return;
}
// parse request parameters.
object[] parameters = correlationState as object[];
if (parameters == null || parameters.Length != 3)
{
throw new InvalidOperationException("Cannot decode request because the IClientMessageInspector not configured properly.");
}
// extract request parameters.
MessageVersion messageVersion = parameters[0] as MessageVersion;
string action = parameters[1] as string;
IServiceMessage request = parameters[2] as IServiceMessage;
object encodeable = null;
if (!reply.Properties.TryGetValue(MessageProperties.UnencodedBody, out encodeable))
{
// extract binary encoded response from body.
XmlDictionaryReader reader = reply.GetReaderAtBodyContents();
reader.MoveToStartElement("InvokeServiceResponse", Namespaces.OpcUaXsd);
byte[] response = reader.ReadElementContentAsBase64();
// decode body.
try
{
encodeable = BinaryDecoder.DecodeMessage(response, null, m_messageContext);
}
catch (Exception e)
{
ServiceResult error = ServiceResult.Create(
e,
StatusCodes.BadDecodingError,
"Could not decoding incoming response message.");
ServiceFault fault = new ServiceFault();
fault.ResponseHeader.RequestHandle = request.GetRequest().RequestHeader.RequestHandle;
fault.ResponseHeader.Timestamp = DateTime.UtcNow;
fault.ResponseHeader.ServiceResult = error.Code;
StringTable stringTable = new StringTable();
fault.ResponseHeader.ServiceDiagnostics = new DiagnosticInfo(
error,
DiagnosticsMasks.NoInnerStatus,
true,
stringTable);
fault.ResponseHeader.StringTable = stringTable.ToArray();
encodeable = fault;
}
}
object unencodedBody = request.CreateResponse((IServiceResponse)encodeable);
// create the unencoded reply message.
Message unencodedReply = Message.CreateMessage(
messageVersion,
action + "Response",
unencodedBody);
unencodedReply.Headers.MessageId = reply.Headers.MessageId;
unencodedReply.Headers.RelatesTo = reply.Headers.RelatesTo;
unencodedReply.Properties.Add(MessageProperties.UnencodedBody, unencodedBody);
// replace the incoming message.
reply = unencodedReply;
}