65 lines
1.7 KiB
Go
65 lines
1.7 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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channel := combineStreamAndSubjectName(js.streamName, subject)
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_, err := js.instance.PublishAsync(channel, payload)
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if err != nil {
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msg := fmt.Sprintf("[NATS JETSTREAM] - publish message to subject #%s error: %s", channel, err.Error())
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return errors.New(msg)
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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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channel := combineStreamAndSubjectName(js.streamName, subject)
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sub, err := js.instance.Subscribe(channel, cb)
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if err != nil {
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msg := fmt.Sprintf("[NATS JETSTREAM] - subscribe subject %s error: %s", channel, err.Error())
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return nil, errors.New(msg)
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}
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return sub, nil
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}
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// PullSubscribe ...
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//
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// Example:
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//
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// js := natsio.GetJetStream()
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//
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// sub, err := js.PullSubscribe("A_SUBJECT", "A_SUBJECT", "A_CONSUMER")
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//
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// for {
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// messages, err := sub.Fetch(10)
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// // process each messages
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// }
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func (js JetStream) PullSubscribe(subject, consumer string) (*nats.Subscription, error) {
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channel := combineStreamAndSubjectName(js.streamName, subject)
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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("[NATS 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(channel, consumer)
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if err != nil {
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msg := fmt.Sprintf("[NATS JETSTREAM] - pull subscribe subject #%s - consumer #%s error: %s", channel, consumer, err.Error())
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return nil, errors.New(msg)
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}
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return sub, nil
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}
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