open62541/src/ua_session.h

#ifndef UA_SESSION_H_
#define UA_SESSION_H_

#include "ua_types.h"
#include "ua_securechannel.h"
#include "queue.h"

/**
 *  @ingroup communication
 *
 * @{
 */

struct ContinuationPointEntry {
    LIST_ENTRY(ContinuationPointEntry) pointers;
    UA_ByteString        identifier;
    UA_BrowseDescription browseDescription;
    UA_Int32            continuationIndex;
    UA_UInt32            maxReferences;
};

struct UA_Session {
    UA_ApplicationDescription clientDescription;
    UA_String         sessionName;
    UA_NodeId         authenticationToken;
    UA_NodeId         sessionId;
    UA_UInt32         maxRequestMessageSize;
    UA_UInt32         maxResponseMessageSize;
    UA_Int64          timeout;
    UA_DateTime       validTill;
    UA_SecureChannel *channel;
    LIST_HEAD(ContinuationPointList, ContinuationPointEntry) continuationPoints;
};

extern UA_Session anonymousSession; ///< If anonymous access is allowed, this session is used internally (Session ID: 0)
extern UA_Session adminSession; ///< Local access to the services (for startup and maintenance) uses this Session with all possible access rights (Session ID: 1)

void UA_Session_init(UA_Session *session);
void UA_Session_deleteMembers(UA_Session *session);

/** If any activity on a session happens, the timeout must be extended */
UA_StatusCode UA_Session_updateLifetime(UA_Session *session);
/** Set up the point in time till the session is valid */
UA_StatusCode UA_Session_setExpirationDate(UA_Session *session);
/** Gets the sessions pending lifetime (calculated from the timeout which was set) */
UA_StatusCode UA_Session_getPendingLifetime(UA_Session *session, UA_Double *pendingLifetime);

void UA_Session_detachSecureChannel(UA_Session *session);

/** @} */

#endif /* UA_SESSION_H_ */