forked from linxGnu/gosmpp
/
session.go
161 lines (137 loc) · 3.6 KB
/
session.go
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package gosmpp
import (
"errors"
"fmt"
"sync/atomic"
"time"
"github.com/linxGnu/gosmpp/pdu"
)
var (
ErrRequestWindowIsNil = errors.New("request window is nil")
ErrWindowSizeEqualZero = errors.New("request window size cannot be 0")
ErrExpireCheckTimerNotSet = errors.New("ExpireCheckTimer cannot be 0 if PduExpireTimeOut is set")
)
// Session represents session for TX, RX, TRX.
type Session struct {
c Connector
originalOnClosed func(State)
settings Settings
rebindingInterval time.Duration
trx atomic.Value // transceivable
state int32
rebinding int32
}
// NewSession creates new session for TX, RX, TRX.
//
// Session will `non-stop`, automatically rebind (create new and authenticate connection with SMSC) when
// unexpected error happened.
//
// `rebindingInterval` indicates duration that Session has to wait before rebinding again.
//
// Setting `rebindingInterval <= 0` will disable `auto-rebind` functionality.
func NewSession(c Connector, settings Settings, rebindingInterval time.Duration) (session *Session, err error) {
if settings.ReadTimeout <= 0 || settings.ReadTimeout <= settings.EnquireLink {
return nil, fmt.Errorf("invalid settings: ReadTimeout must greater than max(0, EnquireLink)")
}
if settings.RequestWindowConfig != nil {
if settings.RequestStore == nil {
return nil, ErrRequestWindowIsNil
}
if settings.MaxWindowSize == 0 {
return nil, ErrWindowSizeEqualZero
}
if settings.PduExpireTimeOut > 0 && settings.ExpireCheckTimer == 0 {
return nil, ErrExpireCheckTimerNotSet
}
}
conn, err := c.Connect()
if err == nil {
session = &Session{
c: c,
rebindingInterval: rebindingInterval,
originalOnClosed: settings.OnClosed,
}
if rebindingInterval > 0 {
newSettings := settings
newSettings.OnClosed = func(state State) {
switch state {
case ExplicitClosing:
return
default:
if session.originalOnClosed != nil {
session.originalOnClosed(state)
}
session.rebind()
}
}
session.settings = newSettings
} else {
session.settings = settings
}
// bind to session
trans := newTransceivable(conn, session.settings)
trans.start()
session.trx.Store(trans)
}
return
}
func (s *Session) bound() *transceivable {
r, _ := s.trx.Load().(*transceivable)
return r
}
// Transmitter returns bound Transmitter.
func (s *Session) Transmitter() Transmitter {
return s.bound()
}
// Receiver returns bound Receiver.
func (s *Session) Receiver() Receiver {
return s.bound()
}
// Transceiver returns bound Transceiver.
func (s *Session) Transceiver() Transceiver {
return s.bound()
}
func (s *Session) GetWindowSize() int {
if s.c.GetBindType() == pdu.Transmitter || s.c.GetBindType() == pdu.Transceiver {
return s.bound().GetWindowSize()
}
return -1
}
// Close session.
func (s *Session) Close() (err error) {
if atomic.CompareAndSwapInt32(&s.state, Alive, Closed) {
err = s.close()
}
return
}
func (s *Session) close() (err error) {
if b := s.bound(); b != nil {
err = b.Close()
}
return
}
func (s *Session) rebind() {
if atomic.CompareAndSwapInt32(&s.rebinding, 0, 1) {
_ = s.close()
for atomic.LoadInt32(&s.state) == Alive {
conn, err := s.c.Connect()
if err != nil {
if s.settings.OnRebindingError != nil {
s.settings.OnRebindingError(err)
}
time.Sleep(s.rebindingInterval)
} else {
// bind to session
trans := newTransceivable(conn, s.settings)
trans.start()
s.trx.Store(trans)
// reset rebinding state
atomic.StoreInt32(&s.rebinding, 0)
if s.settings.OnRebind != nil {
s.settings.OnRebind()
}
return
}
}
}
}