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96 lines
2.9 KiB
96 lines
2.9 KiB
package broker
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import (
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"fmt"
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"github.com/seaweedfs/seaweedfs/weed/filer"
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"github.com/seaweedfs/seaweedfs/weed/glog"
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"github.com/seaweedfs/seaweedfs/weed/mq/topic"
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"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
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"github.com/seaweedfs/seaweedfs/weed/pb/mq_pb"
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"github.com/seaweedfs/seaweedfs/weed/util"
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"io"
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)
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func (b *MessageQueueBroker) SubscribeFollowMe(stream mq_pb.SeaweedMessaging_SubscribeFollowMeServer) (err error) {
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var req *mq_pb.SubscribeFollowMeRequest
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req, err = stream.Recv()
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if err != nil {
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return err
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}
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initMessage := req.GetInit()
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if initMessage == nil {
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return fmt.Errorf("missing init message")
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}
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// create an in-memory offset
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var lastOffset int64
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// follow each published messages
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for {
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// receive a message
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req, err = stream.Recv()
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if err != nil {
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if err == io.EOF {
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err = nil
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break
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}
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glog.V(0).Infof("topic %v partition %v subscribe stream error: %v", initMessage.Topic, initMessage.Partition, err)
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break
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}
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// Process the received message
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if ackMessage := req.GetAck(); ackMessage != nil {
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lastOffset = ackMessage.TsNs
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// println("sub follower got offset", lastOffset)
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} else if closeMessage := req.GetClose(); closeMessage != nil {
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glog.V(0).Infof("topic %v partition %v subscribe stream closed: %v", initMessage.Topic, initMessage.Partition, closeMessage)
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return nil
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} else {
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glog.Errorf("unknown message: %v", req)
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}
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}
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t, p := topic.FromPbTopic(initMessage.Topic), topic.FromPbPartition(initMessage.Partition)
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if lastOffset > 0 {
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err = b.saveConsumerGroupOffset(t, p, initMessage.ConsumerGroup, lastOffset)
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}
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glog.V(0).Infof("shut down follower for %v offset %d", initMessage, lastOffset)
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return err
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}
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func (b *MessageQueueBroker) readConsumerGroupOffset(initMessage *mq_pb.SubscribeMessageRequest_InitMessage) (offset int64, err error) {
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t, p := topic.FromPbTopic(initMessage.Topic), topic.FromPbPartition(initMessage.PartitionOffset.Partition)
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partitionDir := topic.PartitionDir(t, p)
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offsetFileName := fmt.Sprintf("%s.offset", initMessage.ConsumerGroup)
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err = b.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
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data, err := filer.ReadInsideFiler(client, partitionDir, offsetFileName)
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if err != nil {
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return err
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}
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if len(data) != 8 {
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return fmt.Errorf("no offset found")
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}
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offset = int64(util.BytesToUint64(data))
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return nil
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})
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return offset, err
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}
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func (b *MessageQueueBroker) saveConsumerGroupOffset(t topic.Topic, p topic.Partition, consumerGroup string, offset int64) error {
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partitionDir := topic.PartitionDir(t, p)
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offsetFileName := fmt.Sprintf("%s.offset", consumerGroup)
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offsetBytes := make([]byte, 8)
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util.Uint64toBytes(offsetBytes, uint64(offset))
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return b.WithFilerClient(false, func(client filer_pb.SeaweedFilerClient) error {
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glog.V(0).Infof("saving topic %s partition %v consumer group %s offset %d", t, p, consumerGroup, offset)
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return filer.SaveInsideFiler(client, partitionDir, offsetFileName, offsetBytes)
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})
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}
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