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pulsar.go
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pulsar.go
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package cursor
import (
"context"
"errors"
"time"
"github.com/apache/pulsar-client-go/pulsar"
)
var _ Tracker = (*PulsarTracker)(nil)
type PulsarTracker struct {
reader pulsar.Reader
}
func NewPulsarTracker(client pulsar.Client, topic string) (*PulsarTracker, error) {
reader, err := client.CreateReader(pulsar.ReaderOptions{
Topic: topic,
Name: topic + "-producer",
StartMessageID: pulsar.LatestMessageID(),
StartMessageIDInclusive: true,
})
if err != nil {
return nil, err
}
return &PulsarTracker{reader: reader}, nil
}
func (p *PulsarTracker) Last() (last Checkpoint, err error) {
defer p.reader.Close()
var (
msg pulsar.Message
)
for {
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
msg, err = p.reader.Next(ctx)
cancel()
if errors.Is(err, context.DeadlineExceeded) && !p.reader.HasNext() {
err = nil
return
}
if err != nil {
return
}
if last, err = ToCheckpoint(msg); err != nil {
return
}
}
}
func (p *PulsarTracker) Start() {
// Do Nothing
}
func (p *PulsarTracker) Commit(_ Checkpoint, _ pulsar.MessageID) error {
return nil
}
func (p *PulsarTracker) Close() {
// Do Nothing
}