Refactoring, session expiry
This commit is contained in:
bad
parent
9226c0abda
commit
baf746a254
8 changed files with 316 additions and 256 deletions
27
main.go
27
main.go
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@ -14,27 +14,42 @@ func main() {
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listener, err := net.Listen("tcp", listen_addr)
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if err != nil {
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log.Fatal(err)
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log.Fatalf("Coulde't start a listener on tcp %v. Error: %e", listen_addr, err)
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}
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var sessions map[string]*session.Session = make(map[string]*session.Session)
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removeSessChan := make(session.RemoveSessionChannel)
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connChan := make(chan net.Conn)
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go func() {
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for {
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conn, err := listener.Accept()
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if err != nil {
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log.Println("Failed accepting connection ", err)
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} else {
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connChan <- conn
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}
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}
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}()
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for {
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select {
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case con := <- connChan:
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handleConnection(con, sessions, removeSessChan)
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case sesId := <- removeSessChan:
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delete(sessions, sesId)
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}
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handleConnection(conn, sessions)
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}
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}
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func handleConnection(con net.Conn, sessions map[string]*session.Session) {
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func handleConnection(con net.Conn, sessions map[string]*session.Session, rmSessChan session.RemoveSessionChannel) {
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defer handlePanic(con)
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conReq, err := session.NewConnection(con)
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if err != nil {
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// TODO
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panic(err)
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log.Println("Failed to create connection ", err)
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return
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}
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var sess *session.Session
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@ -46,7 +61,7 @@ func handleConnection(con net.Conn, sessions map[string]*session.Session) {
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}
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if sess == nil {
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newSess := session.NewSession(conReq)
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newSess := session.NewSession(conReq, rmSessChan)
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sess = &newSess
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go func() {
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defer handlePanic(con)
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98
session/Session.go
Normal file
98
session/Session.go
Normal file
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@ -0,0 +1,98 @@
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package session
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import (
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"fmt"
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"log"
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"badat.dev/maeqtt/v2/mqtt/packets"
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)
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type Session struct {
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ClientID *string
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// Nullable
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Connection *Connection
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SubscriptionChannel chan packets.PublishPacket
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ConnecionChannel chan ConnectionRequest
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freePacketID uint16
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Expiry
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}
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func NewSession(req ConnectionRequest, rmSessChan RemoveSessionChannel) Session {
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sess := Session{}
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sess.SubscriptionChannel = make(chan packets.PublishPacket,)
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sess.Expiry = NewExpiry(rmSessChan)
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sess.Connect(req)
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return sess
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}
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func (s *Session) Connect(req ConnectionRequest) {
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if s.Connection != nil {
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s.Disconnect(packets.DisconnectReasonCodeSessionTakenOver)
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}
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connAck := packets.ConnackPacket{}
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s.SetExpireTimer(req.ConnectPakcet.Properties.SessionExpiryInterval.Value)
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s.expireTimer.Stop()
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if req.ConnectPakcet.ClientId == nil {
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if s.ClientID == nil {
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s.ClientID = genClientID()
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}
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connAck.Properties.AssignedClientIdentifier.Value = s.ClientID
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} else if s.ClientID != nil && s.ClientID != req.ConnectPakcet.ClientId {
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panic(fmt.Errorf("Session %s connect called with a connect packet with an ID: %s", *s.ClientID, *req.ConnectPakcet.ClientId))
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} else {
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s.ClientID = req.ConnectPakcet.ClientId
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}
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true := byte(1)
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false := byte(0)
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connAck.Properties.WildcardSubscriptionAvailable.Value = &true
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connAck.Properties.RetainAvailable.Value = &false
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connAck.Properties.SharedSubscriptionAvailable.Value = &false
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s.Connection = req.Connection
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s.Connection.sendPacket(connAck)
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}
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// Starts a loop the recieves and responds to packets
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func (s *Session) HandlerLoop() {
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go s.Connection.PacketReadLoop()
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for s.Connection != nil {
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select {
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case packet := <-s.Connection.PacketChannel:
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packet.Visit(s)
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case _ = <-s.Connection.ClientDisconnectedChan:
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s.onDisconnect()
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case c := <-s.ConnecionChannel:
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s.Connect(c)
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case subMessage := <-s.SubscriptionChannel:
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// TODO implement other qos levels
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subMessage.QOSLevel = 0
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subMessage.Dup = false
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s.Connection.sendPacket(subMessage)
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}
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}
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select {
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case c := <-s.ConnecionChannel:
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s.Connect(c)
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// Tail recursion baybeeee
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s.HandlerLoop()
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case _ = <- s.expireTimer.C:
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s.expireSession()
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}
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}
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func (s *Session) onDisconnect() {
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s.Connection = nil
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s.resetExpireTimer()
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log.Printf("Client disconnected, id: %s", *s.ClientID)
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}
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8
session/connectionRequest.go
Normal file
8
session/connectionRequest.go
Normal file
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@ -0,0 +1,8 @@
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package session
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import "badat.dev/maeqtt/v2/mqtt/packets"
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type ConnectionRequest struct {
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Connection *Connection
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ConnectPakcet packets.ConnectPacket
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}
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49
session/expiry.go
Normal file
49
session/expiry.go
Normal file
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@ -0,0 +1,49 @@
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package session
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import (
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"time"
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"badat.dev/maeqtt/v2/subscription"
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)
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type Expiry struct {
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ExpiryInterval time.Duration
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expireTimer time.Timer
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RemoveSessionChannel
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}
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func NewExpiry(channel RemoveSessionChannel) Expiry {
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expiry := Expiry {}
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expiry.RemoveSessionChannel = channel
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expiry.expireTimer = *time.NewTimer(time.Hour*9999)
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expiry.expireTimer.Stop()
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return expiry
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}
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// Channel for removing a session from the global state
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type RemoveSessionChannel chan string
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func (s *Session) expireSession() {
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subscription.Subscriptions.RemoveSubsForChannel(s.SubscriptionChannel)
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s.RemoveSessionChannel <- *s.ClientID
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}
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// newTime is nullable
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func (s *Session) SetExpireTimer(newTime *uint32) {
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var expiry = uint32(0)
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if newTime != nil {
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expiry = *newTime
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} else {
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expiry = uint32(0)
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}
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s.ExpiryInterval = time.Duration(expiry) * time.Second
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}
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func (s *Session) resetExpireTimer() {
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if s.ExpiryInterval == 0 {
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s.expireTimer.Stop()
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} else {
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s.expireTimer.Reset(s.ExpiryInterval)
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}
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}
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93
session/packetVisitors.go
Normal file
93
session/packetVisitors.go
Normal file
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@ -0,0 +1,93 @@
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package session
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import (
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"io"
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"log"
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"badat.dev/maeqtt/v2/mqtt/packets"
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"badat.dev/maeqtt/v2/subscription"
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)
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func (s *Session) VisitConnect(_ packets.ConnectPacket) {
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// Disconnect, we handle the connect packet in Connect,
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// this means that we have an estabilished connection already
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log.Println("WARN: Got a connect packet on an already estabilished connection")
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s.Disconnect(packets.DisconnectReasonCodeProtocolError)
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}
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func (s *Session) VisitPublish(p packets.PublishPacket) {
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subNodes := subscription.Subscriptions.GetSubscriptions(p.TopicName)
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for _, subNode := range subNodes {
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subNode.NodeLock.RLock()
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defer subNode.NodeLock.RUnlock()
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if p.QOSLevel == 0 {
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if p.PacketId != nil {
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log.Printf("Client: %v, Got publish with qos 0 and a packet id, ignoring\n", s.ClientID)
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return
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}
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} else if p.QOSLevel == 1 {
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var reason packets.PubackReasonCode = packets.PubackReasonCodeSuccess
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ack := packets.PubackPacket{
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PacketID: *p.PacketId,
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Reason: reason,
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}
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s.Connection.sendPacket(ack)
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} else if p.QOSLevel == 2 {
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panic("UNIMPLEMENTED QOS level 2")
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}
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for _, sub := range subNode.Subscriptions {
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if !(sub.NoLocal && sub.SubscriptionChannel == s.SubscriptionChannel) {
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go func(sub subscription.Subscription) { sub.SubscriptionChannel <- p }(sub)
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}
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}
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}
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}
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func (s *Session) VisitDisconnect(p packets.DisconnectPacket) {
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err := s.Connection.close()
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if err != nil && err != io.ErrClosedPipe {
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log.Println("Error closing connection", err)
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}
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s.onDisconnect()
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}
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func (s *Session) VisitSubscribe(p packets.SubscribePacket) {
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for _, filter := range p.TopicFilters {
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subscription.Subscriptions.Subscribe(filter, s.SubscriptionChannel)
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}
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s.Connection.sendPacket(packets.SubAckPacket{
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PacketID: p.PacketId,
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Reason: packets.SubackReasonGrantedQoSTwo,
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})
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}
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func (s *Session) VisitUnsubscribe(p packets.UnsubscribePacket) {
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for _, topic := range p.Topics {
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subscription.Subscriptions.Unsubscribe(topic, s.SubscriptionChannel)
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}
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s.Connection.sendPacket(packets.UnsubAckPacket{
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PacketID: p.PacketID,
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Reason: packets.UnsubackReasonSuccess,
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})
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}
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func (s *Session) VisitPing(p packets.PingreqPacket) {
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s.Connection.sendPacket(packets.PingrespPacket{})
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}
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func (s *Session) VisitPubackPacket(_ packets.PubackPacket) {
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panic("not implemented") // TODO: Implement
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}
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func (s *Session) VisitPubrecPacket(_ packets.PubrecPacket) {
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panic("not implemented") // TODO: Implement
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}
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func (s *Session) VisitPubrelPacket(_ packets.PubrelPacket) {
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panic("not implemented") // TODO: Implement
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}
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func (s *Session) VisitPubcompPacket(_ packets.PubcompPacket) {
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panic("not implemented") // TODO: Implement
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}
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@ -1,245 +0,0 @@
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package session
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import (
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"encoding/base64"
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"fmt"
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"io"
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"log"
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"math/rand"
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"time"
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"badat.dev/maeqtt/v2/mqtt/packets"
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"badat.dev/maeqtt/v2/subscription"
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)
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func init() {
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rand.Seed(time.Now().UnixNano())
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}
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func Auth(username string, password []byte) bool {
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return true
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}
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type Session struct {
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ClientID *string
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// Nullable
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Connection *Connection
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SubscriptionChannel chan packets.PublishPacket
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ConnecionChannel chan ConnectionRequest
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ExpiryInterval time.Duration // TODO
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expireTimer time.Timer // TODO
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freePacketID uint16
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}
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type ConnectionRequest struct {
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Connection *Connection
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ConnectPakcet packets.ConnectPacket
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}
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func NewSession(req ConnectionRequest) Session {
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sess := Session{}
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sess.SubscriptionChannel = make(chan packets.PublishPacket)
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sess.Connect(req)
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return sess
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}
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func (s *Session) Connect(req ConnectionRequest) {
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if s.Connection != nil {
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s.Disconnect(packets.DisconnectReasonCodeSessionTakenOver)
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}
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connAck := packets.ConnackPacket{}
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s.updateExpireTimer(req.ConnectPakcet.Properties.SessionExpiryInterval.Value)
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if req.ConnectPakcet.ClientId == nil {
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if s.ClientID == nil {
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s.ClientID = genClientID()
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}
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connAck.Properties.AssignedClientIdentifier.Value = s.ClientID
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} else if s.ClientID != nil && s.ClientID != req.ConnectPakcet.ClientId {
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panic(fmt.Errorf("Session %s connect called with a connect packet with an ID: %s", *s.ClientID, *req.ConnectPakcet.ClientId))
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} else {
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s.ClientID = req.ConnectPakcet.ClientId
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}
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true := byte(1)
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false := byte(0)
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connAck.Properties.WildcardSubscriptionAvailable.Value = &true
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connAck.Properties.RetainAvailable.Value = &false
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connAck.Properties.SharedSubscriptionAvailable.Value = &false
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s.Connection = req.Connection
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err := s.Connection.sendPacket(connAck)
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if err != nil {
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// TODO
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panic(err)
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}
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}
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// Starts a loop the recieves and responds to packets
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func (s *Session) HandlerLoop() {
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go s.Connection.PacketReadLoop()
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for s.Connection != nil {
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select {
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case packet := <-s.Connection.PacketChannel:
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packet.Visit(s)
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case _ = <-s.Connection.ClientDisconnectedChan:
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s.onDisconnect()
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case c := <-s.ConnecionChannel:
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s.Connect(c)
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case subMessage := <-s.SubscriptionChannel:
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subMessage.QOSLevel = 0
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subMessage.Dup = false
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s.Connection.sendPacket(subMessage)
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}
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}
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c := <-s.ConnecionChannel
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s.Connect(c)
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s.HandlerLoop()
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}
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func (s *Session) Disconnect(code packets.DisconnectReasonCode) error {
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s.Connection.sendPacket(packets.DisconnectPacket{
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ReasonCode: code,
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})
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err := s.Connection.close()
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if err != nil {
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return err
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}
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s.onDisconnect()
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return nil
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}
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func (s *Session) onDisconnect() {
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s.Connection = nil
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s.resetExpireTimer()
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log.Printf("Client disconnected, id: %s", *s.ClientID)
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}
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func (s *Session) expireSession() {
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subscription.Subscriptions.RemoveSubsForChannel(s.SubscriptionChannel)
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}
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// newTime is nullable
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func (s *Session) updateExpireTimer(newTime *uint32) {
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var expiry = uint32(0)
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if newTime != nil {
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expiry = *newTime
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} else {
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expiry = uint32(0)
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}
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s.ExpiryInterval = time.Duration(expiry) * time.Second
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if s.Connection == nil {
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s.resetExpireTimer()
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}
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}
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func (s *Session) resetExpireTimer() {
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//s.expireTimer.Reset(s.ExpiryInterval)
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}
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func genClientID() *string {
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buf := make([]byte, 32)
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_, err := rand.Read(buf)
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if err != nil {
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// I don't think this can actually happen but just in case panic
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panic(fmt.Errorf("Failed to generate a client id, %e", err))
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}
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id := "Client_rand_" + base64.URLEncoding.WithPadding(base64.NoPadding).EncodeToString(buf)
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return &id
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}
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func (s *Session) VisitConnect(_ packets.ConnectPacket) {
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// Disconnect, we handle the connect packet in Connect,
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// this means that we have an estabilished connection already
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log.Println("WARN: Got a connect packet on an already estabilished connection")
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s.Disconnect(packets.DisconnectReasonCodeProtocolError)
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}
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func (s *Session) VisitPublish(p packets.PublishPacket) {
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subNodes := subscription.Subscriptions.GetSubscriptions(p.TopicName)
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for _, subNode := range subNodes {
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subNode.NodeLock.RLock()
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defer subNode.NodeLock.RUnlock()
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if p.QOSLevel == 0 {
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if p.PacketId != nil {
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log.Printf("Client: %v, Got publish with qos 0 and a packet id, ignoring\n", s.ClientID)
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return
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}
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} else if p.QOSLevel == 1 {
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var reason packets.PubackReasonCode = packets.PubackReasonCodeSuccess
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ack := packets.PubackPacket{
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PacketID: *p.PacketId,
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Reason: reason,
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}
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s.Connection.sendPacket(ack)
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} else if p.QOSLevel == 2 {
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panic("UNIMPLEMENTED QOS level 2")
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}
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for _, sub := range subNode.Subscriptions {
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if !(sub.NoLocal && sub.SubscriptionChannel == s.SubscriptionChannel) {
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go func(sub subscription.Subscription) { sub.SubscriptionChannel <- p }(sub)
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}
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}
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}
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}
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func (s *Session) VisitDisconnect(p packets.DisconnectPacket) {
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err := s.Connection.close()
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if err != nil && err != io.ErrClosedPipe {
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log.Println("Error closing connection", err)
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}
|
||||
s.onDisconnect()
|
||||
}
|
||||
|
||||
func (s *Session) VisitSubscribe(p packets.SubscribePacket) {
|
||||
for _, filter := range p.TopicFilters {
|
||||
subscription.Subscriptions.Subscribe(filter, s.SubscriptionChannel)
|
||||
}
|
||||
s.Connection.sendPacket(packets.SubAckPacket{
|
||||
PacketID: p.PacketId,
|
||||
Reason: packets.SubackReasonGrantedQoSTwo,
|
||||
})
|
||||
}
|
||||
|
||||
func (s *Session) VisitUnsubscribe(p packets.UnsubscribePacket) {
|
||||
for _, topic := range p.Topics {
|
||||
subscription.Subscriptions.Unsubscribe(topic, s.SubscriptionChannel)
|
||||
}
|
||||
s.Connection.sendPacket(packets.UnsubAckPacket{
|
||||
PacketID: p.PacketID,
|
||||
Reason: packets.UnsubackReasonSuccess,
|
||||
})
|
||||
}
|
||||
|
||||
func (s *Session) VisitPing(p packets.PingreqPacket) {
|
||||
s.Connection.sendPacket(packets.PingrespPacket{})
|
||||
}
|
||||
|
||||
func (s *Session) VisitPubackPacket(_ packets.PubackPacket) {
|
||||
panic("not implemented") // TODO: Implement
|
||||
}
|
||||
|
||||
func (s *Session) VisitPubrecPacket(_ packets.PubrecPacket) {
|
||||
panic("not implemented") // TODO: Implement
|
||||
}
|
||||
|
||||
func (s *Session) VisitPubrelPacket(_ packets.PubrelPacket) {
|
||||
panic("not implemented") // TODO: Implement
|
||||
}
|
||||
|
||||
func (s *Session) VisitPubcompPacket(_ packets.PubcompPacket) {
|
||||
panic("not implemented") // TODO: Implement
|
||||
}
|
||||
|
||||
func (s *Session) getFreePacketId() uint16 {
|
||||
s.freePacketID += 1
|
||||
return s.freePacketID
|
||||
}
|
||||
44
session/utils.go
Normal file
44
session/utils.go
Normal file
|
|
@ -0,0 +1,44 @@
|
|||
package session
|
||||
|
||||
import (
|
||||
"encoding/base64"
|
||||
"fmt"
|
||||
"math/rand"
|
||||
"time"
|
||||
|
||||
"badat.dev/maeqtt/v2/mqtt/packets"
|
||||
)
|
||||
|
||||
func init() {
|
||||
rand.Seed(time.Now().UnixNano())
|
||||
}
|
||||
|
||||
func genClientID() *string {
|
||||
buf := make([]byte, 32)
|
||||
_, err := rand.Read(buf)
|
||||
if err != nil {
|
||||
// I don't think this can actually happen but just in case panic
|
||||
panic(fmt.Errorf("Failed to generate a client id, %e", err))
|
||||
}
|
||||
id := "Client_rand_" + base64.URLEncoding.WithPadding(base64.NoPadding).EncodeToString(buf)
|
||||
return &id
|
||||
}
|
||||
|
||||
func (s *Session) Disconnect(code packets.DisconnectReasonCode) error {
|
||||
s.Connection.sendPacket(packets.DisconnectPacket{
|
||||
ReasonCode: code,
|
||||
})
|
||||
|
||||
err := s.Connection.close()
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
s.onDisconnect()
|
||||
return nil
|
||||
}
|
||||
|
||||
|
||||
func (s *Session) getFreePacketId() uint16 {
|
||||
s.freePacketID += 1
|
||||
return s.freePacketID
|
||||
}
|
||||
|
|
@ -1,7 +1,5 @@
|
|||
package subscription
|
||||
|
||||
//TODO WILDCARD SUBSCRIPTIONS
|
||||
|
||||
import (
|
||||
"strings"
|
||||
"sync"
|
||||
|
|
|
|||
Loading…
Reference in a new issue