bool CommandDispatcher::Step()
/*
* This function receives DIMSE commmands over the network connection
* and handles these commands correspondingly. Note that in case of
* storscp only C-ECHO-RQ and C-STORE-RQ commands can be processed.
*/
{
bool finished = false;
// receive a DIMSE command over the network, with a timeout of 1 second
DcmDataset *statusDetail = NULL;
T_ASC_PresentationContextID presID = 0;
T_DIMSE_Message msg;
OFCondition cond = DIMSE_receiveCommand(assoc_, DIMSE_NONBLOCKING, 1, &presID, &msg, &statusDetail);
elapsedTimeSinceLastCommand_++;
// if the command which was received has extra status
// detail information, dump this information
if (statusDetail != NULL)
{
//LOG4CPP_WARN(Internals::GetLogger(), "Status Detail:" << OFendl << DcmObject::PrintHelper(*statusDetail));
delete statusDetail;
}
if (cond == DIMSE_OUTOFRESOURCES)
{
finished = true;
}
else if (cond == DIMSE_NODATAAVAILABLE)
{
// Timeout due to DIMSE_NONBLOCKING
if (clientTimeout_ != 0 &&
elapsedTimeSinceLastCommand_ >= clientTimeout_)
{
// This timeout is actually a client timeout
finished = true;
}
}
else if (cond == EC_Normal)
{
// Reset the client timeout counter
elapsedTimeSinceLastCommand_ = 0;
// in case we received a valid message, process this command
// note that storescp can only process a C-ECHO-RQ and a C-STORE-RQ
switch (msg.CommandField)
{
case DIMSE_C_ECHO_RQ:
// process C-ECHO-Request
cond = EchoScp(assoc_, &msg, presID);
break;
case DIMSE_C_STORE_RQ:
// process C-STORE-Request
if (server_.HasStoreRequestHandlerFactory())
{
std::auto_ptr<IStoreRequestHandler> handler
(server_.GetStoreRequestHandlerFactory().ConstructStoreRequestHandler());
cond = Internals::storeScp(assoc_, &msg, presID, *handler);
}
else
cond = DIMSE_BADCOMMANDTYPE; // Should never happen
break;
case DIMSE_C_MOVE_RQ:
// process C-MOVE-Request
if (server_.HasMoveRequestHandlerFactory())
{
std::auto_ptr<IMoveRequestHandler> handler
(server_.GetMoveRequestHandlerFactory().ConstructMoveRequestHandler());
cond = Internals::moveScp(assoc_, &msg, presID, *handler);
}
else
cond = DIMSE_BADCOMMANDTYPE; // Should never happen
break;
case DIMSE_C_FIND_RQ:
// process C-FIND-Request
if (server_.HasFindRequestHandlerFactory())
{
std::auto_ptr<IFindRequestHandler> handler
(server_.GetFindRequestHandlerFactory().ConstructFindRequestHandler());
cond = Internals::findScp(assoc_, &msg, presID, *handler);
}
else
cond = DIMSE_BADCOMMANDTYPE; // Should never happen
break;
default:
// we cannot handle this kind of message
cond = DIMSE_BADCOMMANDTYPE;
LOG(ERROR) << "cannot handle command: 0x" << std::hex << msg.CommandField;
break;
}
}
else
{
// Bad status, which indicates the closing of the connection by
// the peer or a network error
finished = true;
}
if (finished)
{
if (cond == DUL_PEERREQUESTEDRELEASE)
{
LOG(INFO) << "Association Release";
ASC_acknowledgeRelease(assoc_);
}
else if (cond == DUL_PEERABORTEDASSOCIATION)
{
LOG(INFO) << "Association Aborted";
}
else
{
OFString temp_str;
LOG(ERROR) << "DIMSE failure (aborting association): " << cond.text();
/* some kind of error so abort the association */
ASC_abortAssociation(assoc_);
}
}
return !finished;
}
OFCondition RetrieveDICOMFilesFromPACS::subOperationSCP(T_ASC_Association **subAssociation)
{
// Ens convertim com en un servei. El PACS ens fa peticions que nosaltres hem de respondre, ens pot demanar descarregar una imatge o fer un echo
T_DIMSE_Message dimseMessage;
T_ASC_PresentationContextID presentationContextID;
if (!ASC_dataWaiting(*subAssociation, 0))
{
return DIMSE_NODATAAVAILABLE;
}
OFCondition condition = DIMSE_receiveCommand(*subAssociation, DIMSE_BLOCKING, 0, &presentationContextID, &dimseMessage, NULL);
if (condition == EC_Normal)
{
switch (dimseMessage.CommandField)
{
case DIMSE_C_STORE_RQ:
condition = storeSCP(*subAssociation, &dimseMessage, presentationContextID);
break;
case DIMSE_C_ECHO_RQ:
condition = echoSCP(*subAssociation, &dimseMessage, presentationContextID);
break;
default:
ERROR_LOG("El PACS ens ha sol.licitat un tipus d'operacio invalida");
condition = DIMSE_BADCOMMANDTYPE;
break;
}
}
// Clean up on association termination
if (condition == DUL_PEERREQUESTEDRELEASE)
{
INFO_LOG("El PACS sol.licita tancar la connexio per on ens ha enviat els fitxers");
condition = ASC_acknowledgeRelease(*subAssociation);
ASC_dropSCPAssociation(*subAssociation);
ASC_destroyAssociation(subAssociation);
return condition;
}
else if (condition == DUL_PEERABORTEDASSOCIATION)
{
INFO_LOG("El PACS ha abortat la connexió");
}
else if (condition != EC_Normal)
{
ERROR_LOG("S'ha produit un error reben la peticio d'una suboperacio, descripcio error: " + QString(condition.text()));
condition = ASC_abortAssociation(*subAssociation);
}
else if (m_abortIsRequested)
{
INFO_LOG("Abortarem les connexions amb el PACS, perque han sol.licitant cancel.lar la descarrega");
condition = ASC_abortAssociation(*subAssociation);
if (!condition.good())
{
ERROR_LOG("Error al abortar la connexio pel qual rebem les imatges" + QString(condition.text()));
}
// Tanquem la connexió amb el PACS perquè segons indica la documentació DICOM al PS 3.4 (Baseline Behavior of SCP) C.4.2.3.1 si abortem
// la connexió per la qual rebem les imatges, el comportament del PACS és desconegut, per exemple DCM4CHEE tanca la connexió amb el PACS, però
// el RAIM_Server no la tanca i la manté fent que no sortim mai d'aquesta classe. Degut a que no es pot saber en aquesta situació com actuaran
// els PACS es tanca aquí la connexió amb el PACS.
condition = ASC_abortAssociation(m_pacsConnection->getConnection());
if (!condition.good())
{
ERROR_LOG("Error al abortar la connexio pel amb el PACS" + QString(condition.text()));
}
else
{
INFO_LOG("Abortada la connexio amb el PACS");
}
}
if (condition != EC_Normal)
{
ASC_dropAssociation(*subAssociation);
ASC_destroyAssociation(subAssociation);
}
return condition;
}