/
session.go
360 lines (296 loc) · 9.05 KB
/
session.go
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package clients
import (
"sync"
"time"
"github.com/VolantMQ/vlapi/mqttp"
"github.com/VolantMQ/vlapi/vlauth"
"github.com/VolantMQ/vlapi/vlpersistence"
"github.com/VolantMQ/vlapi/vlsubscriber"
"github.com/VolantMQ/vlapi/vltypes"
"go.uber.org/zap"
"github.com/VolantMQ/volantmq/configuration"
"github.com/VolantMQ/volantmq/connection"
"github.com/VolantMQ/volantmq/types"
)
type sessionEvents interface {
sessionOffline(string, sessionOfflineState)
connectionClosed(string, bool, mqttp.ReasonCode)
subscriberShutdown(string)
}
type sessionPreConfig struct {
id string
createdAt time.Time
messenger vltypes.TopicMessenger
conn connection.Session
persistence vlpersistence.Packets
permissions vlauth.Permissions
username string
}
type sessionConfig struct {
sessionEvents
subscriber vlsubscriber.IFace
will *mqttp.Publish
expireIn *uint32
durable bool
sharedSubscriptions bool // nolint:structcheck
subscriptionIDAllowed bool
version mqttp.ProtocolVersion
}
type sessionOfflineState struct {
durable bool
keepContainer bool
qos0 int
qos12 int
unAck int
exp *expiryConfig
}
type session struct {
sessionPreConfig
log *zap.SugaredLogger
idLock *sync.Mutex
lock sync.Mutex // nolint:structcheck,unused
stopReq types.Once
sessionConfig
}
func newSession(c sessionPreConfig) *session {
s := &session{
sessionPreConfig: c,
log: configuration.GetLogger().Named("session"),
}
return s
}
func (s *session) configure(c sessionConfig) error {
s.sessionConfig = c
return s.conn.SetOptions(connection.AttachSession(s))
}
func (s *session) start() {
s.idLock.Unlock()
}
func (s *session) stop(reason mqttp.ReasonCode) {
s.stopReq.Do(func() {
s.conn.Stop(reason)
})
}
// SignalPublish process PUBLISH packet from client
func (s *session) SignalPublish(pkt *mqttp.Publish) error {
pkt.SetPublishID(s.subscriber.Hash())
// [MQTT-3.3.1.3]
if pkt.Retain() {
if err := s.messenger.Retain(pkt); err != nil {
s.log.Error("Error retaining message", zap.String("clientId", s.id), zap.Error(err))
}
}
if err := s.messenger.Publish(pkt); err != nil {
s.log.Error("Couldn't publish", zap.String("clientId", s.id), zap.Error(err))
}
return nil
}
// SignalSubscribe process SUBSCRIBE packet from client
func (s *session) SignalSubscribe(pkt *mqttp.Subscribe) (mqttp.IFace, error) {
m, _ := mqttp.New(s.version, mqttp.SUBACK)
resp, _ := m.(*mqttp.SubAck)
id, _ := pkt.ID()
resp.SetPacketID(id)
var retCodes []mqttp.ReasonCode
var retainedPublishes []*mqttp.Publish
subsID := uint32(0)
// V5.0 [MQTT-3.8.2.1.2]
if prop := pkt.PropertyGet(mqttp.PropertySubscriptionIdentifier); prop != nil {
if v, e := prop.AsInt(); e == nil {
if !s.subscriptionIDAllowed {
return nil, mqttp.CodeSubscriptionIDNotSupported
}
subsID = v
} else {
return nil, mqttp.CodeProtocolError
}
}
err := pkt.ForEachTopic(func(t *mqttp.Topic) error {
// V5.0
if t.ShareName() != "" {
// [MQTT-3.8.3-4] It is a Protocol Error to set the No Local bit to 1 on a Shared Subscription
if t.Ops().NL() {
return mqttp.CodeProtocolError
}
if !s.sharedSubscriptions {
retCodes = append(retCodes, mqttp.CodeSharedSubscriptionNotSupported)
return nil
}
}
var reason mqttp.ReasonCode
if e := s.permissions.ACL(s.id, s.username, t.Filter(), vlauth.AccessRead); e == vlauth.StatusAllow {
params := vlsubscriber.SubscriptionParams{
ID: subsID,
Ops: t.Ops(),
}
if granted, retained, ee := s.subscriber.Subscribe(t.Filter(), params); ee != nil {
reason = mqttp.QosFailure
} else {
reason = mqttp.ReasonCode(granted)
retainedPublishes = append(retainedPublishes, retained...)
}
} else {
// [MQTT-3.9.3]
if s.version == mqttp.ProtocolV50 {
reason = mqttp.CodeNotAuthorized
} else {
reason = mqttp.QosFailure
}
}
retCodes = append(retCodes, reason)
return nil
})
if err != nil {
return nil, err
}
if err = resp.AddReturnCodes(retCodes); err != nil {
return nil, err
}
// Now put retained messages into publish queue
for _, rp := range retainedPublishes {
if p, e := rp.Clone(s.version); e == nil {
p.SetRetain(true)
s.conn.Publish(s.id, p)
} else {
s.log.Error("clone PUBLISH message", zap.String("clientId", s.id), zap.Error(e))
}
}
if prop := pkt.PropertyGet(mqttp.PropertyUserProperty); prop != nil {
if vl, e := prop.AsStringPair(); e == nil {
_ = resp.PropertySet(mqttp.PropertyUserProperty, vl)
}
if vl, e := prop.AsStringPairs(); e == nil {
_ = resp.PropertySet(mqttp.PropertyUserProperty, vl)
}
}
return resp, nil
}
// SignalUnSubscribe process UNSUBSCRIBE packet from client
func (s *session) SignalUnSubscribe(pkt *mqttp.UnSubscribe) (mqttp.IFace, error) {
var retCodes []mqttp.ReasonCode
_ = pkt.ForEachTopic(func(t *mqttp.Topic) error {
reason := mqttp.CodeSuccess
if e := s.permissions.ACL(s.id, s.username, t.Full(), vlauth.AccessRead); e == vlauth.StatusAllow {
if e = s.subscriber.UnSubscribe(t.Full()); e != nil {
s.log.Error("unsubscribe from topic", zap.String("clientId", s.id), zap.Error(e))
reason = mqttp.CodeNoSubscriptionExisted
}
} else {
// [MQTT-3.9.3]
if s.version == mqttp.ProtocolV50 {
reason = mqttp.CodeNotAuthorized
} else {
reason = mqttp.QosFailure
}
}
retCodes = append(retCodes, reason)
return nil
})
m, _ := mqttp.New(s.version, mqttp.UNSUBACK)
resp, _ := m.(*mqttp.UnSubAck)
id, _ := pkt.ID()
resp.SetPacketID(id)
if err := resp.AddReturnCodes(retCodes); err != nil {
s.log.Error("unsubscribe set return codes", zap.String("clientId", s.id), zap.Error(err))
}
if prop := pkt.PropertyGet(mqttp.PropertyUserProperty); prop != nil {
if vl, err := prop.AsStringPair(); err == nil {
_ = resp.PropertySet(mqttp.PropertyUserProperty, vl)
}
if vl, err := prop.AsStringPairs(); err == nil {
_ = resp.PropertySet(mqttp.PropertyUserProperty, vl)
}
}
return resp, nil
}
// SignalDisconnect process DISCONNECT packet from client
func (s *session) SignalDisconnect(pkt *mqttp.Disconnect) error {
var err error
if s.version == mqttp.ProtocolV50 {
// FIXME: CodeRefusedBadUsernameOrPassword has same id as CodeDisconnectWithWill
if pkt.ReasonCode() != mqttp.CodeRefusedBadUsernameOrPassword {
s.will = nil
}
if prop := pkt.PropertyGet(mqttp.PropertySessionExpiryInterval); prop != nil {
if val, ok := prop.AsInt(); ok == nil {
// If the Session Expiry Interval in the CONNECT packet was zero, then it is a Protocol Error to set a non-
// zero Session Expiry Interval in the DISCONNECT packet sent by the Client. If such a non-zero Session
// Expiry Interval is received by the Server, it does not treat it as a valid DISCONNECT mqttp. The Server
// uses DISCONNECT with Reason Code 0x82 (Protocol Error) as described in section 4.13.
if (s.expireIn != nil && *s.expireIn == 0) && val != 0 {
err = mqttp.CodeProtocolError
} else {
s.expireIn = &val
}
}
}
} else {
s.will = nil
}
return err
}
// SignalOnline signal state is get online
func (s *session) SignalOnline() {
s.subscriber.Online(s.conn.Publish)
}
// SignalOffline put subscriber in offline mode
func (s *session) SignalOffline() {
// If session expiry is set to 0, the Session ends when the Network Connection is closed
if s.expireIn != nil && *s.expireIn == 0 {
s.durable = false
}
s.subscriber.Offline(!s.durable)
}
// SignalConnectionClose net connection has been closed
func (s *session) SignalConnectionClose(params connection.DisconnectParams) {
// valid willMsg pointer tells we have will message
// if session is clean send will regardless to will delay
willIn := uint32(0)
state := sessionOfflineState{
durable: s.durable,
qos0: len(params.Packets.QoS0),
qos12: len(params.Packets.QoS12),
unAck: len(params.Packets.UnAck),
}
if s.will != nil {
if val := s.will.PropertyGet(mqttp.PropertyWillDelayInterval); val != nil {
willIn, _ = val.AsInt()
}
if willIn == 0 {
if err := s.messenger.Publish(s.will); err != nil {
s.log.Error("Publish will message", zap.String("ClientID", s.id), zap.Error(err))
}
s.will = nil
}
}
state.keepContainer = (s.durable && s.subscriber.HasSubscriptions()) || (willIn > 0)
s.connectionClosed(s.id, s.durable, params.Reason)
if !state.keepContainer {
s.subscriberShutdown(s.id)
s.subscriber = nil
}
if s.durable {
if err := s.persistence.PacketsStore([]byte(s.id), params.Packets); err != nil {
s.log.Error("persisting packets", zap.String("clientId", s.id), zap.Error(err))
}
} else {
_ = s.persistence.PacketsDelete([]byte(s.id))
}
var exp *expiryConfig
if params.Reason != mqttp.CodeSessionTakenOver {
if willIn > 0 || (s.expireIn != nil && *s.expireIn > 0) {
exp = &expiryConfig{
id: s.id,
createdAt: s.createdAt,
messenger: s.messenger,
will: s.will,
expireIn: s.expireIn,
willIn: willIn,
}
state.keepContainer = true
}
}
state.exp = exp
s.sessionOffline(s.id, state)
s.stopReq.Do(func() {})
}