wolfstudy edited a comment on issue #328:
URL:
https://github.com/apache/pulsar-client-go/issues/328#issuecomment-662981076
Maybe `HasNext() ` is a good way.
```
func (r *reader) HasNext() bool {
if !r.lastMessageInBroker.IsZero() && r.hasMoreMessages() {
return true
}
for {
lastMsgID, err := r.pc.getLastMessageID()
if err != nil {
r.log.WithError(err).Error("Failed to get last message
id from broker")
continue
} else {
r.lastMessageInBroker = lastMsgID
break
}
}
return r.hasMoreMessages()
}
```
It will determine whether there is a next message based on
`getLastMessageID`.
> Tips: Make sure that the reader is started before the producer sends a
message, this is why the value of HasNext you get at the beginning is false
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