60 lines
1.6 KiB
Go
60 lines
1.6 KiB
Go
package natsio
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import (
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"errors"
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"fmt"
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"github.com/nats-io/nats.go"
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)
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// Publish ...
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func (js JetStream) Publish(subject string, payload []byte) error {
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_, err := js.instance.PublishAsync(subject, payload)
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if err != nil {
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msg := fmt.Sprintf("[natsio.JetStream] publish message to subject #%s error: %s", subject, err.Error())
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return errors.New(msg)
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}
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if js.debug {
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fmt.Printf("[natsio.JetStream] published a message to subject #%s \n", subject)
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}
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return nil
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}
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// Subscribe ...
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func (js JetStream) Subscribe(subject string, cb nats.MsgHandler) (*nats.Subscription, error) {
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sub, err := js.instance.Subscribe(subject, cb)
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if err != nil {
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msg := fmt.Sprintf("[natsio.JetStream] subscribe subject %s error: %s", subject, err.Error())
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return nil, errors.New(msg)
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}
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if js.debug {
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fmt.Printf("[natsio.JetStream] subscribe new message from subject #%s \n", subject)
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}
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return sub, nil
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}
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func (js JetStream) PullSubscribe(subject, consumer string) (*nats.Subscription, error) {
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// check if consumer existed
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con, err := js.GetConsumerInfo(consumer)
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if con == nil || err != nil {
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msg := fmt.Sprintf("[natsio.JetStream] pull subscribe consumer %s not existed in stream %s", consumer, js.streamName)
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return nil, errors.New(msg)
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}
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// pull
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sub, err := js.instance.PullSubscribe(subject, consumer)
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if err != nil {
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msg := fmt.Sprintf("[natsio.JetStream] pull subscribe subject #%s - consumer #%s error: %s", subject, consumer, err.Error())
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return nil, errors.New(msg)
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}
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if js.debug {
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fmt.Printf("[natsio.JetStream] pull subscribe new message from subject #%s \n", subject)
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}
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return sub, nil
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}
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