You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
101 lines
3.4 KiB
101 lines
3.4 KiB
package broker
|
|
|
|
import (
|
|
"fmt"
|
|
"github.com/seaweedfs/seaweedfs/weed/filer"
|
|
"github.com/seaweedfs/seaweedfs/weed/glog"
|
|
"github.com/seaweedfs/seaweedfs/weed/mq/topic"
|
|
"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
|
|
"github.com/seaweedfs/seaweedfs/weed/pb/mq_pb"
|
|
"github.com/seaweedfs/seaweedfs/weed/util"
|
|
"io"
|
|
"time"
|
|
)
|
|
|
|
func (b *MessageQueueBroker) SubscribeFollowMe(stream mq_pb.SeaweedMessaging_SubscribeFollowMeServer) (err error) {
|
|
var req *mq_pb.SubscribeFollowMeRequest
|
|
req, err = stream.Recv()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
initMessage := req.GetInit()
|
|
if initMessage == nil {
|
|
return fmt.Errorf("missing init message")
|
|
}
|
|
|
|
// create an in-memory offset
|
|
var lastOffset int64
|
|
|
|
// follow each published messages
|
|
for {
|
|
// receive a message
|
|
req, err = stream.Recv()
|
|
if err != nil {
|
|
if err == io.EOF {
|
|
err = nil
|
|
break
|
|
}
|
|
glog.V(0).Infof("topic %v partition %v subscribe stream error: %v", initMessage.Topic, initMessage.Partition, err)
|
|
break
|
|
}
|
|
|
|
// Process the received message
|
|
if ackMessage := req.GetAck(); ackMessage != nil {
|
|
lastOffset = ackMessage.TsNs
|
|
// println("sub follower got offset", lastOffset)
|
|
} else if closeMessage := req.GetClose(); closeMessage != nil {
|
|
glog.V(0).Infof("topic %v partition %v subscribe stream closed: %v", initMessage.Topic, initMessage.Partition, closeMessage)
|
|
return nil
|
|
} else {
|
|
glog.Errorf("unknown message: %v", req)
|
|
}
|
|
}
|
|
|
|
t, p := topic.FromPbTopic(initMessage.Topic), topic.FromPbPartition(initMessage.Partition)
|
|
|
|
if lastOffset > 0 {
|
|
err = b.saveConsumerGroupOffset(t, p, initMessage.ConsumerGroup, lastOffset)
|
|
}
|
|
|
|
glog.V(0).Infof("shut down follower for %v offset %d", initMessage, lastOffset)
|
|
|
|
return err
|
|
}
|
|
|
|
func (b *MessageQueueBroker) readConsumerGroupOffset(initMessage *mq_pb.SubscribeMessageRequest_InitMessage) (offset int64, err error) {
|
|
t, p := topic.FromPbTopic(initMessage.Topic), topic.FromPbPartition(initMessage.PartitionOffset.Partition)
|
|
|
|
topicDir := fmt.Sprintf("%s/%s/%s", filer.TopicsDir, t.Namespace, t.Name)
|
|
partitionGeneration := time.Unix(0, p.UnixTimeNs).UTC().Format(topic.TIME_FORMAT)
|
|
partitionDir := fmt.Sprintf("%s/%s/%04d-%04d", topicDir, partitionGeneration, p.RangeStart, p.RangeStop)
|
|
offsetFileName := fmt.Sprintf("%s.offset", initMessage.ConsumerGroup)
|
|
|
|
err = b.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
|
|
data, err := filer.ReadInsideFiler(client, partitionDir, offsetFileName)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if len(data) != 8 {
|
|
return fmt.Errorf("no offset found")
|
|
}
|
|
offset = int64(util.BytesToUint64(data))
|
|
return nil
|
|
})
|
|
return offset, err
|
|
}
|
|
|
|
func (b *MessageQueueBroker) saveConsumerGroupOffset(t topic.Topic, p topic.Partition, consumerGroup string, offset int64) error {
|
|
|
|
topicDir := fmt.Sprintf("%s/%s/%s", filer.TopicsDir, t.Namespace, t.Name)
|
|
partitionGeneration := time.Unix(0, p.UnixTimeNs).UTC().Format(topic.TIME_FORMAT)
|
|
partitionDir := fmt.Sprintf("%s/%s/%04d-%04d", topicDir, partitionGeneration, p.RangeStart, p.RangeStop)
|
|
offsetFileName := fmt.Sprintf("%s.offset", consumerGroup)
|
|
|
|
offsetBytes := make([]byte, 8)
|
|
util.Uint64toBytes(offsetBytes, uint64(offset))
|
|
|
|
return b.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
|
|
glog.V(0).Infof("saving topic %s partition %v consumer group %s offset %d", t, p, consumerGroup, offset)
|
|
return filer.SaveInsideFiler(client, partitionDir, offsetFileName, offsetBytes)
|
|
})
|
|
}
|