// publish is used to publish events using the configured protocol client.
// It provides general error handling and back off support used on failed
// send attempts. To be used by PublishEvent and PublishEvents.
// The send callback will try to progress sending traffic and returns kind of
// progress made in ok or resetFail. If ok is set to true, send finished
// processing events. If ok is false but resetFail is set, send was partially
// successful. If send was partially successful, the fail counter is reset thus up
// to maxAttempts send attempts without any progress might be executed.
func (s *Mode) publish(
signaler op.Signaler,
opts outputs.Options,
send func() (ok bool, resetFail bool),
) error {
fails := 0
var err error
guaranteed := opts.Guaranteed || s.maxAttempts == 0
for !s.closed && (guaranteed || fails < s.maxAttempts) {
ok := false
resetFail := false
if err := s.connect(); err != nil {
logp.Err("Connecting error publishing events (retrying): %s", err)
goto sendFail
}
ok, resetFail = send()
if !ok {
s.closeClient()
goto sendFail
}
debugf("send completed")
s.backoff.Reset()
op.SigCompleted(signaler)
return nil
sendFail:
debugf("send fail")
fails++
if resetFail {
debugf("reset fails")
s.backoff.Reset()
fails = 0
}
s.backoff.Wait()
if !guaranteed && (s.maxAttempts > 0 && fails == s.maxAttempts) {
// max number of attempts reached
debugf("max number of attempts reached")
break
}
}
debugf("messages dropped")
mode.Dropped(1)
op.SigFailed(signaler, err)
return nil
}
// dropping is called when a message is dropped. It updates the
// relevant counters and sends a failed signal.
func dropping(msg eventsMessage) {
debugf("messages dropped")
mode.Dropped(1)
op.SigFailed(msg.signaler, nil)
}