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consumer.go
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consumer.go
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package sg
import (
"context"
"io"
"log"
"github.com/sandglass/sandglass-grpc/go/sgproto"
)
type Consumer struct {
client *Client
topic, partition, group, name string
}
func (c *Consumer) Consume(ctx context.Context) (chan *sgproto.Message, error) {
consumer, err := c.client.client.ConsumeFromGroup(ctx, &sgproto.ConsumeFromGroupRequest{
Topic: c.topic,
Partition: c.partition,
ConsumerGroupName: c.group,
ConsumerName: c.name,
})
if err != nil {
return nil, err
}
msgCh := make(chan *sgproto.Message, 1)
go func() {
defer close(msgCh)
for {
msg, err := consumer.Recv()
if err == io.EOF {
return
} else if err != nil {
// TODO: handle this error more appropriately
log.Printf("got err while consuming: %v", err)
return
}
msgCh <- msg
}
}()
return msgCh, nil
}
func (c *Consumer) Acknowledge(ctx context.Context, msgs ...*sgproto.Message) error {
offsets := make([]sgproto.Offset, len(msgs))
for i, msg := range msgs {
offsets[i] = msg.Offset
}
_, err := c.client.client.Acknowledge(ctx, &sgproto.MarkRequest{
Topic: c.topic,
Partition: c.partition,
ConsumerGroup: c.group,
ConsumerName: c.name,
Offsets: offsets,
})
return err
}
func (c *Consumer) NotAcknowledge(ctx context.Context, msgs ...*sgproto.Message) error {
offsets := make([]sgproto.Offset, len(msgs))
for i, msg := range msgs {
offsets[i] = msg.Offset
}
_, err := c.client.client.NotAcknowledge(ctx, &sgproto.MarkRequest{
Topic: c.topic,
Partition: c.partition,
ConsumerGroup: c.group,
ConsumerName: c.name,
Offsets: offsets,
})
return err
}