func (this *Server) getSession(svc *service, req *message.ConnectMessage, resp *message.ConnackMessage) error {
// If CleanSession is set to 0, the server MUST resume communications with the
// client based on state from the current session, as identified by the client
// identifier. If there is no session associated with the client identifier the
// server must create a new session.
//
// If CleanSession is set to 1, the client and server must discard any previous
// session and start a new one. This session lasts as long as the network c
// onnection. State data associated with this session must not be reused in any
// subsequent session.
var err error
// Check to see if the client supplied an ID, if not, generate one and set
// clean session.
if len(req.ClientId()) == 0 {
req.SetClientId([]byte(fmt.Sprintf("internalclient%d", svc.id)))
req.SetCleanSession(true)
}
cid := string(req.ClientId())
// If CleanSession is NOT set, check the session store for existing session.
// If found, return it.
if !req.CleanSession() {
if svc.sess, err = this.sessMgr.Get(cid); err == nil {
resp.SetSessionPresent(true)
if err := svc.sess.Update(req); err != nil {
return err
}
}
}
// If CleanSession, or no existing session found, then create a new one
if svc.sess == nil {
if svc.sess, err = this.sessMgr.New(cid); err != nil {
return err
}
resp.SetSessionPresent(false)
if err := svc.sess.Init(req); err != nil {
return err
}
}
return nil
}
