/
manager.go
239 lines (206 loc) · 6.39 KB
/
manager.go
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package session
import (
"errors"
"sync/atomic"
"github.com/baetyl/baetyl-broker/exchange"
"github.com/baetyl/baetyl-broker/store"
"github.com/baetyl/baetyl-go/v2/log"
"github.com/baetyl/baetyl-go/v2/mqtt"
)
// all errors
var (
ErrConnectionRefuse = errors.New("connection refuse on server side")
ErrSessionClientAlreadyClosed = errors.New("session client is already closed")
ErrSessionClientAlreadyConnecting = errors.New("session client is already connected")
ErrSessionClientPacketUnexpected = errors.New("session client received unexpected packet")
ErrSessionClientPacketIDConflict = errors.New("packet id conflict, to acknowledge old packet")
ErrSessionClientPacketNotFound = errors.New("packet id is not found")
ErrSessionClientIDInvalid = errors.New("client ID is invalid")
ErrSessionProtocolVersionInvalid = errors.New("protocol version is invalid")
ErrSessionUsernameNotSet = errors.New("username is not set")
ErrSessionUsernameNotPermitted = errors.New("username or password is not permitted")
ErrSessionCertificateCommonNameNotFound = errors.New("certificate common name is not found")
ErrSessionCertificateCommonNameNotPermitted = errors.New("certificate common name is not permitted")
ErrSessionMessageQosNotSupported = errors.New("message QOS is not supported")
ErrSessionMessageTopicInvalid = errors.New("message topic is invalid")
ErrSessionMessageTopicNotPermitted = errors.New("message topic is not permitted")
ErrSessionMessagePayloadSizeExceedsLimit = errors.New("message payload exceeds the max limit")
ErrSessionWillMessageQosNotSupported = errors.New("will QoS is not supported")
ErrSessionWillMessageTopicInvalid = errors.New("will topic is invalid")
ErrSessionWillMessageTopicNotPermitted = errors.New("will topic is not permitted")
ErrSessionWillMessagePayloadSizeExceedsLimit = errors.New("will message payload exceeds the max limit")
ErrSessionSubscribePayloadEmpty = errors.New("subscribe payload can't be empty")
ErrSessionManagerClosed = errors.New("manager has closed")
)
// Manager the manager of sessions
type Manager struct {
cfg Config
store store.DB
sessions *syncmap
clients *syncmap
checker *mqtt.TopicChecker
exch *exchange.Exchange
auth *Authenticator
sessionBucket store.Bucket
retainBucket store.Bucket
log *log.Logger
quit int32 // if quit != 0, it means manager is closed
}
// NewManager create a new session manager
func NewManager(cfg Config) (m *Manager, err error) {
m = &Manager{
cfg: cfg,
sessions: newSyncMap(),
clients: newSyncMap(),
checker: mqtt.NewTopicChecker(cfg.SysTopics),
exch: exchange.NewExchange(cfg.SysTopics),
auth: NewAuthenticator(cfg.Principals),
log: log.With(log.Any("session", "manager")),
}
m.store, err = store.New(cfg.Persistence.Store)
if err != nil {
return nil, err
}
m.sessionBucket, err = m.store.NewBucket("#session", nil)
if err != nil {
m.Close()
return
}
m.retainBucket, err = m.store.NewBucket("#retain", nil)
if err != nil {
m.Close()
return
}
var ss []Info
// load stored sessions from backend database
err = m.sessionBucket.ListKV(&ss)
if err != nil {
m.Close()
return
}
for _, si := range ss {
m.checkSubscriptions(&si)
var s *Session
s, err = newSession(si, m)
if err != nil {
m.Close()
return
}
m.sessions.store(si.ID, s)
}
m.log.Info("session manager has initialized")
return m, nil
}
func (m *Manager) addClient(si Info, c *Client) (s *Session, exists bool, err error) {
if err = m.checkQuitState(); err != nil {
return
}
defer func() {
if err != nil {
m.clients.delete(si.ID)
return
}
c.setSession(si.ID, s)
}()
if v, loaded := m.clients.store(si.ID, c); loaded {
v.(*Client).close()
}
if v, loaded := m.sessions.load(si.ID); loaded {
s = v.(*Session)
if !s.info.CleanSession {
exists = true
s.update(si, c.authorize)
return
}
// If CleanSession is set to 1, the Client and Server MUST discard any previous Session and start a new one. [MQTT-3.1.2-6]
m.cleanSession(s)
}
s, err = newSession(si, m)
if err != nil {
return
}
m.sessions.store(si.ID, s)
return
}
func (m *Manager) delClient(clientID string) error {
if err := m.checkQuitState(); err != nil {
return err
}
m.clients.delete(clientID)
v, exists := m.sessions.load(clientID)
if !exists {
return nil
}
s := v.(*Session)
if s.info.CleanSession {
m.cleanSession(s)
}
return nil
}
func (m *Manager) cleanSession(s *Session) {
m.exch.UnbindAll(s)
m.sessions.delete(s.info.ID)
s.close()
}
func (m *Manager) checkQuitState() error {
if atomic.LoadInt32(&m.quit) == 1 {
m.log.Error(ErrSessionManagerClosed.Error())
return ErrSessionManagerClosed
}
return nil
}
func (m *Manager) checkSubscriptions(si *Info) {
for topic, qos := range si.Subscriptions {
// Re-check subscriptions, if topic invalid, log error, delete and skip
if qos != 0 && qos != 1 {
m.log.Warn(ErrSessionMessageQosNotSupported.Error(), log.Any("qos", qos))
delete(si.Subscriptions, topic)
continue
}
if !m.checker.CheckTopic(topic, true) {
m.log.Warn(ErrSessionMessageTopicInvalid.Error(), log.Any("topic", topic))
delete(si.Subscriptions, topic)
continue
}
}
}
// Close close
func (m *Manager) Close() error {
if err := m.checkQuitState(); err != nil {
return nil
}
m.log.Info("session manager is closing")
defer m.log.Info("session manager has closed")
atomic.AddInt32(&m.quit, -1)
for _, s := range m.sessions.empty() {
s.(*Session).close()
}
for _, c := range m.clients.empty() {
c.(*Client).close()
}
if m.sessionBucket != nil {
m.sessionBucket.Close(false)
}
if m.retainBucket != nil {
m.retainBucket.Close(false)
}
if m.store != nil {
m.store.Close()
}
return nil
}
// * retain message operations
func (m *Manager) listRetainedMessages() ([]*mqtt.Message, error) {
msgs := make([]*mqtt.Message, 0)
err := m.retainBucket.ListKV(&msgs)
if err != nil {
return nil, err
}
return msgs, nil
}
func (m *Manager) retainMessage(msg *mqtt.Message) error {
return m.retainBucket.SetKV(msg.Context.Topic, msg)
}
func (m *Manager) unretainMessage(topic string) error {
return m.retainBucket.DelKV(topic)
}