/// <summary>
/// Turns a simple HL7 data item into a full blown HL7-ACK message
/// </summary>
/// <param name="messageData">Simple HL7 data item</param>
/// <returns>HL7-ACK message</returns>
private string ConstructHL7Acknowledgement(DataForHL7Acknowledgement messageData)
{
// construct HL7-ACK
NHapi.Model.V25.Message.ACK ack = new NHapi.Model.V25.Message.ACK();
// MSH-segment:
ack.MSH.SendingApplication.NamespaceID.Value = "BigPicture";
ack.MSH.ReceivingApplication.NamespaceID.Value = messageData.SendingApplicationNamespaceID;
ack.MSH.ReceivingApplication.UniversalID.Value = messageData.SendingApplicationUniversalID;
ack.MSH.ReceivingApplication.UniversalIDType.Value = messageData.SendingApplicationUniversalIDType;
ack.MSH.MessageControlID.Value = messageData.MessageControlID;
ack.MSH.ProcessingID.ProcessingID.Value = "P";
ack.MSH.AcceptAcknowledgmentType.Value = "NE";
ack.MSH.ApplicationAcknowledgmentType.Value = "NE";
// MSA-segment
ack.MSA.AcknowledgmentCode.Value = "CA";
ack.MSA.MessageControlID.Value = messageData.MessageControlID;
// use parser to convert or HL7-ACK to string for sending
PipeParser parserResponse = new PipeParser();
return(parserResponse.Encode(ack));
}
/// <summary>
/// This is a thread for the client that has connected
/// </summary>
/// <param name="client">Client (GX-machine)</param>
private void HandleClientComm(object client)
{
//TCP client that connected
TcpClient tcpClient = (TcpClient)client;
//Get reference to stream for client so we can read/write data
NetworkStream networkStream = tcpClient.GetStream();
//log that new client connected
Logger.Log(string.Format("New client connected: {0}", tcpClient.Client.RemoteEndPoint.ToString()), LogLevel.Info);
//variable to keep track of the bytes we received in the client stream
int bytesRead;
//variable for constructing the message
string hl7Message = string.Empty;
//this will store all messages we receive for later ACK:
List <DataForHL7Acknowledgement> dataForAck = new List <DataForHL7Acknowledgement>();
bool awaitingHl7Ack = false;
//keep track of connection state:
ConnectionState connState = ConnectionState.Neutral;
while (true)
{
bytesRead = 0;
string message = string.Empty;
try
{
//blocks until a client sends a message
//bytesRead = networkStream.Read(message, 0, 1024 * 1024);
if (networkStream.CanRead)
{
byte[] msg = new byte[1];//TODO: set a higher value here or some other method to prevent reading lots of null-bytes/ Research: how to get perfect buffer size?
StringBuilder myCompleteMessage = new StringBuilder();
// Incoming message may be larger than the buffer size.
do
{
bytesRead = networkStream.Read(msg, 0, msg.Length);
myCompleteMessage.AppendFormat("{0}", Encoding.ASCII.GetString(msg, 0, msg.Length));
}while (networkStream.DataAvailable);
message = myCompleteMessage.ToString();
}
else
{
Console.WriteLine("Sorry. You cannot read from this NetworkStream.");
}
}
catch
{
//a socket error has occurred
break;
}
if (bytesRead == 0)
{
//the client has disconnected from the server
break;
}
//message has successfully been received
ASCIIEncoding encoder = new ASCIIEncoding();
//Logger.Log(encoder.GetString(message), LogLevel.Info);
//if we got an ENQ, respond with ACK:
if (message[0] == Constants.ENQ)
{
Logger.Log("Sending ACK in response to ENQ...", LogLevel.Info);
networkStream.WriteByte(Constants.ACK);
networkStream.Flush();
connState = ConnectionState.Receiving;
}
//if eot of full message, confirm end of receiving and start transmission of HL7 ack
else if (connState == ConnectionState.Receiving && message[0] == Constants.EOT)
{
//send enq to go from neutral state to transmission:
Logger.Log("Sending ENQ...", LogLevel.Info);
networkStream.WriteByte(Constants.ENQ);
networkStream.Flush();
connState = ConnectionState.Sending;
}
//did we get an eot in response to our hl7-eot?
else if (connState == ConnectionState.Sending && message[0] == Constants.EOT)
{
//do nothing (we're back in neutral state)
Logger.Log("Received EOT from GX", LogLevel.Info);
//set vars back to neutral
connState = ConnectionState.Neutral;
}
//did we receive an ack in response to our enq and do we have messages to send acks for?
else if (connState == ConnectionState.Sending && message[0] == Constants.ACK)
{
//GX acknowledged last message -> remove from list:
if (dataForAck.Any() && awaitingHl7Ack)
{
var data = dataForAck.First();
dataForAck.Remove(data);
}
if (!dataForAck.Any())
{
//send eot
Logger.Log("Sending EOT in response to ACK for HL7-ACK...", LogLevel.Info);
networkStream.WriteByte(Constants.EOT);
networkStream.Flush();
awaitingHl7Ack = false;
connState = ConnectionState.Neutral;
}
else
{
//get first data in list to acknowledge
var data = dataForAck.First();
awaitingHl7Ack = true;
PipeParser parser = new PipeParser();
//also need to send ack of complete message:
Logger.Log("Sending ack of entire message", LogLevel.Info);
NHapi.Model.V25.Message.ACK ack = new NHapi.Model.V25.Message.ACK();
//MSH-part of message acknowledgement:
ack.MSH.SendingApplication.NamespaceID.Value = "LIS";//TODO: set to "bigpicture"
ack.MSH.ReceivingApplication.NamespaceID.Value = data.SendingApplicationNamespaceID;
ack.MSH.ReceivingApplication.UniversalID.Value = data.SendingApplicationUniversalID;
ack.MSH.ReceivingApplication.UniversalIDType.Value = data.SendingApplicationUniversalIDType;
//ack.MSH.DateTimeOfMessage.Time.Set(DateTime.Now, "yyyyMMddHHmmss");
string guid = Guid.NewGuid().ToString();
ack.MSH.MessageControlID.Value = data.MessageControlID;
ack.MSH.ProcessingID.ProcessingID.Value = "P";
ack.MSH.AcceptAcknowledgmentType.Value = "NE";
ack.MSH.ApplicationAcknowledgmentType.Value = "NE";
//MSA-part
ack.MSA.AcknowledgmentCode.Value = "CA";
ack.MSA.MessageControlID.Value = data.MessageControlID;
//ack.MSA.TextMessage.Value = "Test";
PipeParser parserResponse = new PipeParser();
string hl7Response = parserResponse.Encode(ack);
//wrapping message in hl7 llp start and end chars?
//hl7Response = encoder.GetString(new byte[] { PIPE }) + hl7Response + encoder.GetString(new byte[] { SEPARATOR }) + encoder.GetString(new byte[] { CR });
//get checksum for sending:
byte[] hl7ResponseForChecksum = encoder.GetBytes("1" + hl7Response + encoder.GetString(new byte[1] {
Constants.ETX
}));
int checksum = 0;
for (int i = 0; i < hl7ResponseForChecksum.Length; i++)
{
checksum += hl7ResponseForChecksum[i];
}
//convert checksum to hex so we can get eight least significant bits:
string checksumHex = checksum.ToString("X");
//wrapping message in astm control chars
// "0" = Frame Number
hl7Response = encoder.GetString(new byte[1] {
Constants.STX
}) + "1" + hl7Response + encoder.GetString(new byte[1] {
Constants.ETX
}) + checksumHex.Substring(checksumHex.Length - 2, 1) + checksumHex.Substring(checksumHex.Length - 1, 1) + encoder.GetString(new byte[1] {
Constants.CR
}) + encoder.GetString(new byte[1] {
Constants.LF
});
//hl7Response = encoder.GetString(hl7Response );
byte[] response = encoder.GetBytes(hl7Response);
networkStream.Write(response, 0, response.Length);
networkStream.Flush();
}
}
else if (connState == ConnectionState.Receiving && message[0] == Constants.STX && (message.Any(m => m == Constants.ETX) || message.Any(m => m == Constants.ETB))) //we received a message frame
{
//TODO: verify that this is the frame number we expected, return nak if not
int frameNumber = Convert.ToInt32(message[1]) - 48;
bool isEndFrame = false;
Logger.Log(string.Format("Received {0}frame (Nr. {1})", isEndFrame ? "end" : "", frameNumber), LogLevel.Info);
//get text of message. It's the 2nd byte up until the ETB or ETX control character:
if (message.Any(m => m == Constants.ETX))
{
isEndFrame = true;
}
int indexOfEndMessage = message.IndexOf(isEndFrame ? Encoding.ASCII.GetString(new byte[] { Constants.ETX }) : Encoding.ASCII.GetString(new byte[] { Constants.ETB }));// Array.IndexOf(message, isEndFrame ? Constants.ETX : Constants.ETB);
//string encodedMessage = encoder.GetString(message, 2, indexOfEndMessage);
//TODO: verify checksum, send NAK if not correct
int cs1 = message[indexOfEndMessage + 1];
int cs2 = message[indexOfEndMessage + 2];
int checksum = 0;
for (int i = 1; i < indexOfEndMessage + 1; i++)
{
checksum += message[i];
}
//check checksum; send nak if not correct:
if (!checksum.ToString("X").EndsWith(message[indexOfEndMessage + 1].ToString() + message[indexOfEndMessage + 2].ToString()))
{
//send NAK for this frame
networkStream.WriteByte(Constants.NAK);
networkStream.Flush();
Logger.Log("Sent NAK because checksum incorrect", LogLevel.Warning);
}
else
{
hl7Message += message.Substring(2, indexOfEndMessage - 2);
//use nhapi to parse message if message complete:
if (isEndFrame)
{
PipeParser parser = new PipeParser();
ORU_R30 hl7 = new ORU_R30();
try
{
IMessage im = parser.Parse(hl7Message);
hl7 = im as ORU_R30;
}
catch (Exception e)
{
//send NAK for this frame
networkStream.WriteByte(Constants.EOT);
networkStream.Flush();
Logger.Log("Error converting message: " + e.Message, LogLevel.Error, hl7Message);
return;
}
try
{
//genexpert sends spm which isn't officially part of ORU_R30:
hl7.addNonstandardSegment("SPM");
//TODO: validate
parser.Parse((NHapi.Model.V25.Segment.SPM)hl7.GetStructure("SPM"), hl7Message.Substring(hl7Message.IndexOf("SPM"), 40), new EncodingCharacters('|', hl7.MSH.EncodingCharacters.Value));
}
catch (Exception e)
{
//send NAK for this frame
networkStream.WriteByte(Constants.EOT);
networkStream.Flush();
Logger.Log("Error parsing specimen part of message: " + e.Message, LogLevel.Error, hl7Message);
return;
}
//get all values that are of interest to us:
if (hl7 != null)
{
//make sure it's a Tb-result:
if (hl7.OBR.UniversalServiceIdentifier.Identifier.Value == "MTB-RIF")
{
//log message:
//Logger.Log(string.Format("HL7 Message: {0}", hl7Message), LogLevel.Info);
//try to store in db:
try
{
//store in database
using (BigPictureEntities bpe = new BigPictureEntities())
{
//first, see if we know this machine already and create it if we don't:
string instrumentSerial = ((NHapi.Model.V25.Datatype.EI)hl7.GetOBSERVATION(0).OBX.GetField(18).GetValue(4)).EntityIdentifier.Value;
device device = bpe.devices.FirstOrDefault(d => d.Serial == instrumentSerial);
//create device if we don't have it yet
if (device == null)
{
device = new device();
device.Serial = instrumentSerial;
device.InsertedBy = device.UpdatedBy = "BigPicture Listener";
device.InsertedOn = device.InsertedOn = DateTime.Now;
bpe.devices.Add(device);
}
//Add test to database if it doesn't exist already (=re-upload)
string cartridgeSerial = ((NHapi.Model.V25.Datatype.EI)hl7.GetOBSERVATION(0).OBX.GetField(18).GetValue(2)).EntityIdentifier.Value;
test test = bpe.tests.FirstOrDefault(t => t.CartridgeSerial == cartridgeSerial);
//create test if not already exists
if (test == null)
{
test = new test();
test.InsertedOn = DateTime.Now;
test.InsertedBy = "BigPicture Listener";
test.CartridgeSerial = cartridgeSerial;
bpe.tests.Add(test);
}
//fill test with new data we got:
test.AssayHostTestCode = hl7.OBR.UniversalServiceIdentifier.Identifier.Value;
test.AssayName = ((NHapi.Model.V25.Datatype.CE)hl7.GetOBSERVATION(0).OBX.GetField(3).GetValue(0)).Identifier.ExtraComponents.getComponent(1).Data.ToString();
test.AssayVersion = ((NHapi.Model.V25.Datatype.CE)hl7.GetOBSERVATION(0).OBX.GetField(3).GetValue(0)).Identifier.ExtraComponents.getComponent(2).Data.ToString();
test.CartridgeExpirationDate = DateTime.ParseExact(((NHapi.Model.V25.Datatype.EI)hl7.GetOBSERVATION(0).OBX.GetField(18).GetValue(0)).EntityIdentifier.Value.ToString(), "yyyyMMdd", CultureInfo.CurrentCulture);
test.ComputerName = ((NHapi.Model.V25.Datatype.EI)hl7.GetOBSERVATION(0).OBX.GetField(18).GetValue(5)).EntityIdentifier.Value.ToString();
test.SenderUser = ((NHapi.Model.V25.Datatype.XCN)hl7.GetOBSERVATION(0).OBX.GetField(16)[0]).FamilyName.Surname.ToString();
test.SenderVersion = hl7.MSH.SendingApplication.Components[2].ToString();
test.deployment = device.deployment;
test.MessageSentOn = hl7.MSH.DateTimeOfMessage.Time.GetAsDate();
test.ModuleSerial = ((NHapi.Model.V25.Datatype.EI)hl7.GetOBSERVATION(0).OBX.GetField(18).GetValue(3)).EntityIdentifier.Value.ToString();
//test.Notes = ;
//test.PatientId = ;
test.ReagentLotId = ((NHapi.Model.V25.Datatype.EI)hl7.GetOBSERVATION(0).OBX.GetField(18).GetValue(1)).EntityIdentifier.Value.ToString();
test.ResultText = ((NHapi.Base.Model.Varies)hl7.GetOBSERVATION(0).OBX.GetField(5).GetValue(0)).Data.ToString() + "|" + ((NHapi.Base.Model.Varies)hl7.GetOBSERVATION(19).OBX.GetField(5).GetValue(0)).Data.ToString() + "|";
test.SampleId = ((NHapi.Model.V25.Datatype.EI)(((NHapi.Model.V25.Datatype.EIP)((NHapi.Model.V25.Segment.SPM)hl7.GetStructure("SPM")).SpecimenID)[0])).EntityIdentifier.Value;
test.SystemName = hl7.MSH.SendingApplication.Components[0].ToString();
//test.TestEndedOn = ;
test.TestStartedOn = hl7.ORC.DateTimeOfTransaction.Time.GetAsDate();
test.UpdatedBy = "BigPicture Listener";
test.UpdatedOn = DateTime.Now;
//normalize test results. TODO: handle if not exits yet
//TB-result:
//TODO: Throw godo error/log when not present in db:
string resultTestCodeTb = ((NHapi.Model.V25.Datatype.CE)hl7.GetOBSERVATION(0).OBX.GetField(3).GetValue(0)).Identifier.ExtraComponents.getComponent(0).Data.ToString().Replace("4", "");
int resultTestCodeIdTb = bpe.resulttestcodes.First(r => r.ResultTestCode1 == resultTestCodeTb).ResultTestCodeId;
testresult testResultTb = new testresult();
testResultTb.InsertedBy = testResultTb.UpdatedBy = "BigPicture Listener";
testResultTb.InsertedOn = testResultTb.UpdatedOn = DateTime.Now;
testResultTb.Result = ((NHapi.Base.Model.Varies)hl7.GetOBSERVATION(0).OBX.GetField(5).GetValue(0)).Data == null || ((NHapi.Base.Model.Varies)hl7.GetOBSERVATION(0).OBX.GetField(5).GetValue(0)).Data.ToString() == null ? "" : ((NHapi.Base.Model.Varies)hl7.GetOBSERVATION(0).OBX.GetField(5).GetValue(0)).Data.ToString();
testResultTb.TestId = test.TestId;
testResultTb.ResultTestCodeId = resultTestCodeIdTb;
bpe.testresults.Add(testResultTb);
//Rif-resistance-result:
//TODO: Throw godo error/log when not present in db:
string resultTestCodeRif = ((NHapi.Model.V25.Datatype.CE)hl7.GetOBSERVATION(19).OBX.GetField(3).GetValue(0)).Identifier.ExtraComponents.getComponent(0).Data.ToString();
int resultTestCodeIdRif = bpe.resulttestcodes.First(r => r.ResultTestCode1 == resultTestCodeRif).ResultTestCodeId;
testresult testResultRif = new testresult();
testResultRif.InsertedBy = testResultRif.UpdatedBy = "BigPicture Listener";
testResultRif.InsertedOn = testResultRif.UpdatedOn = DateTime.Now;
testResultRif.Result = ((NHapi.Base.Model.Varies)hl7.GetOBSERVATION(19).OBX.GetField(5).GetValue(0)).Data == null || ((NHapi.Base.Model.Varies)hl7.GetOBSERVATION(19).OBX.GetField(5).GetValue(0)).Data.ToString() == null ? "" : ((NHapi.Base.Model.Varies)hl7.GetOBSERVATION(19).OBX.GetField(5).GetValue(0)).Data.ToString();
testResultRif.TestId = test.TestId;
testResultRif.ResultTestCodeId = resultTestCodeIdRif;
bpe.testresults.Add(testResultRif);
//finally, save everything to db:
bpe.SaveChanges();
}
}
catch (Exception e)
{
Logger.Log("Store in DB failed: " + e.Message, LogLevel.Error, hl7Message);
}
}
}
//add to list of received messages for later HL7 ACK:
DataForHL7Acknowledgement data = new DataForHL7Acknowledgement();
data.SendingApplicationNamespaceID = hl7.MSH.SendingApplication.NamespaceID.Value.ToString();
data.SendingApplicationUniversalID = hl7.MSH.SendingApplication.UniversalID.Value.ToString();
data.SendingApplicationUniversalIDType = hl7.MSH.SendingApplication.UniversalIDType.Value.ToString();
data.MessageControlID = hl7.MSH.MessageControlID.Value.ToString();
dataForAck.Add(data);
//empty message-var for the next message to be sent
hl7Message = string.Empty;
//for some reason, our system is too quick for GX. need a delay here (really!)
//TODO: Double-check that this is really necessary
//Thread.Sleep(1000);
//send ACK for this frame
networkStream.WriteByte(Constants.ACK);
networkStream.Flush();
Logger.Log("Sent ACK of endframe", LogLevel.Info);
}
else
{
//send ACK for this frame
networkStream.WriteByte(Constants.ACK);
networkStream.Flush();
Logger.Log("Sent ACK of regular frame", LogLevel.Info);
}
}
}
else
{
//send ACK in any other case
networkStream.WriteByte(Constants.ACK);
networkStream.Flush();
Logger.Log("Sent ACK for random frame", LogLevel.Info);
}
}
tcpClient.Close();
}
public static IMessage MakeACK(ISegment inboundHeader, string ackCode)
{
if (!inboundHeader.GetStructureName().Equals("MSH"))
throw new NHapi.Base.HL7Exception(
"Need an MSH segment to create a response ACK (got " + inboundHeader.GetStructureName() + ")");
// Find the HL7 version of the inbound message:
//
string version = null;
try
{
version = Terser.Get(inboundHeader, 12, 0, 1, 1);
}
catch (NHapi.Base.HL7Exception)
{
// I'm not happy to proceed if we can't identify the inbound
// message version.
throw new NHapi.Base.HL7Exception("Failed to get valid HL7 version from inbound MSH-12-1");
}
IMessage ackMessage = new ACK();
// Create a Terser instance for the outbound message (the ACK).
Terser terser = new Terser(ackMessage);
// Populate outbound MSH fields using data from inbound message
ISegment outHeader = (ISegment)terser.getSegment("MSH");
DeepCopy.copy(inboundHeader, outHeader);
// Now set the message type, HL7 version number, acknowledgement code
// and message control ID fields:
string sendingApp = terser.Get("/MSH-3");
string sendingEnv = terser.Get("/MSH-4");
terser.Set("/MSH-3", CommunicationName);
terser.Set("/MSH-4", EnvironmentIdentifier);
terser.Set("/MSH-5", sendingApp);
terser.Set("/MSH-6", sendingEnv);
terser.Set("/MSH-7", DateTime.Now.ToString("yyyyMMddmmhh"));
terser.Set("/MSH-9", "ACK");
terser.Set("/MSH-12", version);
terser.Set("/MSA-1", ackCode == null ? "AA" : ackCode);
terser.Set("/MSA-2", Terser.Get(inboundHeader, 10, 0, 1, 1));
return ackMessage;
}