106 lines
2.4 KiB
Go
106 lines
2.4 KiB
Go
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.ConnecionChannel = make(chan ConnectionRequest)
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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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s.stopExpireTimer()
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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.SetExpireTimerDuration(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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_ = s.Connection.sendPacket(connAck)
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go s.Connection.PacketReadLoop()
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}
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// Starts a loop the receives and responds to packets
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func (s *Session) HandlerLoop() {
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for {
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var packetChan chan packets.ClientPacket
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if s.Connection != nil {
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packetChan = s.Connection.PacketChannel
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}
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select {
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case packet, more := <-packetChan:
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if more {
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packet.Visit(s)
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} else {
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s.onDisconnect()
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}
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case c := <-s.ConnecionChannel:
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s.Connect(c)
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case <-s.expiryChannel():
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s.expireSession()
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break
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case subMessage := <-s.SubscriptionChannel:
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if s.Connection != nil {
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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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err := s.Connection.sendPacket(subMessage)
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if err != nil {
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panic("TOOO handle this")
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}
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}
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}
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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.startExpireTimer()
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log.Printf("Client disconnected, id: %s", *s.ClientID)
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}
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