/
stream.go
287 lines (255 loc) · 6 KB
/
stream.go
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package mqtt
import (
"fmt"
"math"
"sync"
"time"
"github.com/baetyl/baetyl-go/errors"
"github.com/baetyl/baetyl-go/log"
"github.com/baetyl/baetyl-go/utils"
)
const subscribeId = 1
type stream struct {
cli *Client
observer Observer
conn Connection
connectFuture *Future
subscribeFuture *Future
tracker *Tracker
tomb utils.Tomb
once sync.Once
mu sync.Mutex
}
func (c *Client) connect(obs Observer) (s *stream, err error) {
// dialing
dialer := NewDialer(c.ops.TLSConfig, c.ops.Timeout)
conn, err := dialer.Dial(c.ops.Address)
if err != nil {
return nil, errors.Trace(err)
}
// send connect
connect := NewConnect()
connect.ClientID = c.ops.ClientID
connect.KeepAlive = uint16(math.Ceil(c.ops.KeepAlive.Seconds()))
connect.CleanSession = c.ops.CleanSession
connect.Username = c.ops.Username
connect.Password = c.ops.Password
// connect.Will = c.ops.WillMessage
err = conn.Send(connect, false)
if err != nil {
conn.Close()
return nil, errors.Trace(err)
}
if len(c.ops.Subscriptions) != 0 {
subscribe := NewSubscribe()
subscribe.ID = subscribeId
subscribe.Subscriptions = c.ops.Subscriptions
err = conn.Send(subscribe, false)
if err != nil {
conn.Close()
return nil, err
}
}
s = &stream{
cli: c,
observer: obs,
conn: conn,
connectFuture: NewFuture(),
subscribeFuture: NewFuture(),
tracker: NewTracker(c.ops.KeepAlive),
}
s.tomb.Go(s.receiving)
if c.ops.KeepAlive > 0 {
s.tomb.Go(s.pinging)
}
err = s.connectFuture.Wait(c.ops.Timeout)
if err != nil {
s.die("connect timeout", err)
return nil, errors.Trace(err)
}
if len(c.ops.Subscriptions) != 0 {
err = s.subscribeFuture.Wait(c.ops.Timeout)
if err != nil {
s.die("subscribe timeout", err)
return nil, err
}
}
return s, nil
}
func (s *stream) send(pkt Packet, async bool) error {
s.tracker.Reset()
s.mu.Lock()
err := s.conn.Send(pkt, async)
s.mu.Unlock()
if err != nil {
s.die("failed to send packet", err)
return errors.Trace(err)
}
if ent := s.cli.log.Check(log.DebugLevel, "client sent a packet"); ent != nil {
ent.Write(log.Any("pkt", fmt.Sprintf("%v", pkt)))
}
return nil
}
func (s *stream) sending(curr Packet) Packet {
s.cli.log.Info("client starts to send packets")
defer s.cli.log.Info("client has stopped sending packets")
var err error
if curr != nil {
err = s.send(curr, true)
if err != nil {
return curr
}
}
for {
select {
case pkt := <-s.cli.cache:
err = s.send(pkt, true)
if err != nil {
return pkt
}
case <-s.cli.tomb.Dying():
return nil
case <-s.tomb.Dying():
return nil
}
}
}
func (s *stream) receiving() error {
s.cli.log.Info("client starts to receive packets")
defer s.cli.log.Info("client has stopped receiving packets")
var connacked bool
for {
pkt, err := s.conn.Receive()
if err != nil {
s.die("client failed to receive packet", err)
return errors.Trace(err)
}
if ent := s.cli.log.Check(log.DebugLevel, "client received a packet"); ent != nil {
ent.Write(log.Any("pkt", fmt.Sprintf("%v", pkt)))
}
if !connacked {
connacked = true
err = s.onConnack(pkt)
if err != nil {
s.die("failed to handle connack", err)
return errors.Trace(err)
}
s.connectFuture.Complete(nil)
continue
}
switch p := pkt.(type) {
case *Publish:
qos := p.Message.QOS
uerr := s.onPublish(p)
if uerr != nil {
s.cli.log.Warn("failed to handle publish packet in user code", log.Error(uerr))
} else if !s.cli.ops.DisableAutoAck && qos == 1 {
ack := NewPuback()
ack.ID = p.ID
err = s.send(ack, true)
}
case *Puback:
err = s.onPuback(p)
case *Suback:
err = s.onSuback(p)
case *Pingresp:
s.tracker.Pong()
case *Connack:
err = errors.Trace(ErrClientAlreadyConnecting)
default:
err = errors.Errorf("packet (%v) not supported", p)
}
if err != nil {
s.die("failed to handle packet", err)
return errors.Trace(err)
}
}
}
func (s *stream) pinging() error {
s.cli.log.Info("client starts to send pings")
defer s.cli.log.Info("client has stopped sending pings")
var err error
var window time.Duration
for {
window = s.tracker.Window()
if window < 0 {
// check if a pong has already been sent
if s.tracker.Pending() {
s.die(ErrClientMissingPong.Error(), ErrClientMissingPong)
return errors.Trace(ErrClientMissingPong)
}
s.tracker.Ping()
err = s.send(NewPingreq(), false)
if err != nil {
return errors.Trace(err)
}
s.cli.log.Debug("client sent a ping")
}
select {
case <-time.After(window):
continue
case <-s.tomb.Dying():
return nil
}
}
}
func (s *stream) die(msg string, err error) {
s.once.Do(func() {
s.connectFuture.Cancel(nil)
s.subscribeFuture.Cancel(nil)
if err != nil {
s.onError(msg, err)
s.cli.log.Error("stream has died", log.Error(err))
} else {
s.send(NewDisconnect(), false)
}
s.tomb.Kill(err)
s.conn.Close()
})
}
func (s *stream) close() error {
s.die("", nil)
return errors.Trace(s.tomb.Wait())
}
func (s *stream) onConnack(pkt Packet) error {
p, ok := pkt.(*Connack)
if !ok {
return errors.Trace(ErrClientExpectedConnack)
}
if p.ReturnCode != ConnectionAccepted {
return errors.Errorf(p.ReturnCode.String())
}
return nil
}
func (s *stream) onPublish(pkt *Publish) error {
if s.observer == nil {
return nil
}
return s.observer.OnPublish(pkt)
}
func (s *stream) onPuback(pkt *Puback) error {
if s.observer == nil {
return nil
}
return s.observer.OnPuback(pkt)
}
func (s *stream) onSuback(pkt *Suback) error {
if pkt.ID != subscribeId {
s.cli.log.Warn("received unexpected suback", log.Any("packet", pkt.String()))
return nil
}
for _, code := range pkt.ReturnCodes {
if code == QOSFailure {
return errors.Trace(ErrClientSubscriptionFailed)
}
}
s.subscribeFuture.Complete(nil)
return nil
}
func (s *stream) onError(msg string, err error) {
if s.observer == nil || err == nil {
return
}
s.cli.log.Error(msg, log.Error(err))
s.observer.OnError(err)
}