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[CHANGED] MQTT s.clear() do not wait for JS responses when disconnecting the session #5575

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merged 6 commits into from
Jun 21, 2024
Merged

[CHANGED] MQTT s.clear() do not wait for JS responses when disconnecting the session #5575

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ddda72d
[CHANGED] MQTT s.clear() do not wait for JS responses when disconnect…
levb May 31, 2024
00efd84
Removed commented out code
levb Jun 20, 2024
25490e1
fixes for moving nowait into NewRequest
levb Jun 20, 2024
8c9faa7
Reverted to the original approach, removed TestMQTTSessionNotDeletedO…
levb Jun 21, 2024
539b79f
removed dead code
levb Jun 21, 2024
59db092
restored the original newRequest, not Ex
levb Jun 21, 2024
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32 changes: 22 additions & 10 deletions server/mqtt.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1000,7 +1000,7 @@ func (s *Server) mqttHandleClosedClient(c *client) {

// This needs to be done outside of any lock.
if doClean {
if err := sess.clear(); err != nil {
if err := sess.clear(true); err != nil {
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This will be invoked for "clean" sessions, which means sessions which state should be discarded and not reused in any subsequent session. Could there be a situation where a create/close/create causes an issue since some assets may not have been completely removed from the JS server?

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We don't do anything with the error other than logging it anyway, so the logic doesn't change. Also, if the session is re-created as clean, we'd clean out its state on CONNECT. If it is re-created as persistent... 0/5 we could wipe out and re-create the consumers if there was a session message; but if we failed to delete the session message on the "clean" DISCONNECT... well, it still would not change the existing logic, would it?

c.Errorf(err.Error())
}
}
Expand Down Expand Up @@ -1475,7 +1475,7 @@ func (s *Server) mqttCreateAccountSessionManager(acc *Account, quitCh chan struc
// Opportunistically delete the old (legacy) consumer, from v2.10.10 and
// before. Ignore any errors that might arise.
rmLegacyDurName := mqttRetainedMsgsStreamName + "_" + jsa.id
jsa.deleteConsumer(mqttRetainedMsgsStreamName, rmLegacyDurName)
jsa.deleteConsumer(mqttRetainedMsgsStreamName, rmLegacyDurName, true)

// Create a new, uniquely names consumer for retained messages for this
// server. The prior one will expire eventually.
Expand Down Expand Up @@ -1622,6 +1622,10 @@ func (jsa *mqttJSA) newRequestExMulti(kind, subject, cidHash string, hdrs []int,
r2i[reply] = i
}

if timeout == 0 {
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return nil, nil
}

// Wait for all responses to come back, or for the timeout to expire. We
// don't want to use time.After() which causes memory growth because the
// timer can't be stopped and will need to expire to then be garbage
Expand Down Expand Up @@ -1701,9 +1705,17 @@ func (jsa *mqttJSA) createDurableConsumer(cfg *CreateConsumerRequest) (*JSApiCon
return ccr, ccr.ToError()
}

func (jsa *mqttJSA) deleteConsumer(streamName, consName string) (*JSApiConsumerDeleteResponse, error) {
// if noWait is specified, does not wait for the JS response, returns nil
func (jsa *mqttJSA) deleteConsumer(streamName, consName string, noWait bool) (*JSApiConsumerDeleteResponse, error) {
subj := fmt.Sprintf(JSApiConsumerDeleteT, streamName, consName)
cdri, err := jsa.newRequest(mqttJSAConsumerDel, subj, 0, nil)

timeout := mqttJSAPITimeout
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if noWait {
timeout = 0
}

// timeout == 0 signals that we don't want to wait for the response.
cdri, err := jsa.newRequestEx(mqttJSAConsumerDel, subj, _EMPTY_, -1, nil, timeout)
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if err != nil {
return nil, err
}
Expand Down Expand Up @@ -3178,7 +3190,7 @@ func (sess *mqttSession) save() error {
//
// Runs from the client's readLoop.
// Lock not held on entry, but session is in the locked map.
func (sess *mqttSession) clear() error {
func (sess *mqttSession) clear(noWait bool) error {
var durs []string
var pubRelDur string

Expand Down Expand Up @@ -3206,19 +3218,19 @@ func (sess *mqttSession) clear() error {
sess.mu.Unlock()

for _, dur := range durs {
if _, err := sess.jsa.deleteConsumer(mqttStreamName, dur); isErrorOtherThan(err, JSConsumerNotFoundErr) {
if _, err := sess.jsa.deleteConsumer(mqttStreamName, dur, noWait); isErrorOtherThan(err, JSConsumerNotFoundErr) {
return fmt.Errorf("unable to delete consumer %q for session %q: %v", dur, sess.id, err)
}
}
if pubRelDur != _EMPTY_ {
_, err := sess.jsa.deleteConsumer(mqttOutStreamName, pubRelDur)
_, err := sess.jsa.deleteConsumer(mqttOutStreamName, pubRelDur, noWait)
if isErrorOtherThan(err, JSConsumerNotFoundErr) {
return fmt.Errorf("unable to delete consumer %q for session %q: %v", pubRelDur, sess.id, err)
}
}

if seq > 0 {
err := sess.jsa.deleteMsg(mqttSessStreamName, seq, true)
err := sess.jsa.deleteMsg(mqttSessStreamName, seq, !noWait)
// Ignore the various errors indicating that the message (or sequence)
// is already deleted, can happen in a cluster.
if isErrorOtherThan(err, JSSequenceNotFoundErrF) {
Expand Down Expand Up @@ -3484,7 +3496,7 @@ func (sess *mqttSession) untrackPubRel(pi uint16) (jsAckSubject string) {
func (sess *mqttSession) deleteConsumer(cc *ConsumerConfig) {
sess.mu.Lock()
sess.tmaxack -= cc.MaxAckPending
sess.jsa.sendq.push(&mqttJSPubMsg{subj: sess.jsa.prefixDomain(fmt.Sprintf(JSApiConsumerDeleteT, mqttStreamName, cc.Durable))})
sess.jsa.deleteConsumer(mqttStreamName, cc.Durable, true)
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sess.mu.Unlock()
}

Expand Down Expand Up @@ -3823,7 +3835,7 @@ CHECK:
// This Session lasts as long as the Network Connection. State data
// associated with this Session MUST NOT be reused in any subsequent
// Session.
if err := es.clear(); err != nil {
if err := es.clear(false); err != nil {
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At least here we make sure that the delete is complete, which I think is the right thing to do.

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Right. I understand why checking the success is important here, thus preserved as before.

asm.removeSession(es, true)
return err
}
Expand Down