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consumer.go
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consumer.go
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package runtime
import (
"context"
"github.com/apache/pulsar-client-go/pulsar"
)
type Consumer interface {
Receive() ([]byte, error)
ReceiveStruct() (Message, error)
Close()
}
type PulsarConsumer struct {
client pulsar.Client
consumer pulsar.Consumer
}
func (c *PulsarConsumer) Receive() ([]byte, error) {
msg, err := c.consumer.Receive(context.Background())
return msg.Payload(), err
}
func (c *PulsarConsumer) ReceiveStruct() (Message, error) {
msg, err := c.consumer.Receive(context.Background())
if err != nil {
return Message{}, err
}
var s Message
err = msg.GetSchemaValue(&s)
return s, err
}
func (c *PulsarConsumer) Close() {
c.consumer.Close()
c.client.Close()
}
func NewPulsarConsumer(URL string, topic string, schema *string) (*PulsarConsumer, error) {
client, err := pulsar.NewClient(pulsar.ClientOptions{
URL: URL,
})
if err != nil {
return nil, err
}
option := pulsar.ConsumerOptions{
Topic: topic,
SubscriptionName: "my-sub",
Type: pulsar.Shared,
}
if schema != nil {
option.Schema = pulsar.NewJSONSchema(*schema, nil)
}
consumer, err := client.Subscribe(option)
if err != nil {
return nil, err
}
return &PulsarConsumer{
client: client,
consumer: consumer,
}, nil
}