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96 lines
2.7 KiB
96 lines
2.7 KiB
package broker
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import (
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"context"
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"fmt"
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"github.com/seaweedfs/seaweedfs/weed/glog"
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"github.com/seaweedfs/seaweedfs/weed/pb"
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"github.com/seaweedfs/seaweedfs/weed/pb/mq_pb"
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"io"
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"math/rand"
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"sync"
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"time"
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)
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func (b *MessageQueueBroker) PublishFollowMe(c context.Context, request *mq_pb.PublishFollowMeRequest) (*mq_pb.PublishFollowMeResponse, error) {
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glog.V(0).Infof("PublishFollowMe %v", request)
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var wg sync.WaitGroup
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wg.Add(1)
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var ret error
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go b.withBrokerClient(true, pb.ServerAddress(request.BrokerSelf), func(client mq_pb.SeaweedMessagingClient) error {
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followerId := rand.Int31()
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subscribeClient, err := client.FollowInMemoryMessages(context.Background(), &mq_pb.FollowInMemoryMessagesRequest{
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Message: &mq_pb.FollowInMemoryMessagesRequest_Init{
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Init: &mq_pb.FollowInMemoryMessagesRequest_InitMessage{
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ConsumerGroup: string(b.option.BrokerAddress()),
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ConsumerId: fmt.Sprintf("followMe-%d", followerId),
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FollowerId: followerId,
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Topic: request.Topic,
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PartitionOffset: &mq_pb.PartitionOffset{
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Partition: request.Partition,
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StartTsNs: 0,
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StartType: mq_pb.PartitionOffsetStartType_EARLIEST_IN_MEMORY,
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},
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},
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},
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})
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if err != nil {
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glog.Errorf("FollowInMemoryMessages error: %v", err)
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ret = err
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return err
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}
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// receive first hello message
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resp, err := subscribeClient.Recv()
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if err != nil {
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return fmt.Errorf("FollowInMemoryMessages recv first message error: %v", err)
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}
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if resp == nil {
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glog.V(0).Infof("doFollowInMemoryMessage recv first message nil response")
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return io.ErrUnexpectedEOF
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}
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wg.Done()
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b.doFollowInMemoryMessage(context.Background(), subscribeClient)
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return nil
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})
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wg.Wait()
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return &mq_pb.PublishFollowMeResponse{}, ret
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}
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func (b *MessageQueueBroker) doFollowInMemoryMessage(c context.Context, client mq_pb.SeaweedMessaging_FollowInMemoryMessagesClient) {
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for {
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resp, err := client.Recv()
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if err != nil {
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if err != io.EOF {
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glog.V(0).Infof("doFollowInMemoryMessage error: %v", err)
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}
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return
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}
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if resp == nil {
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glog.V(0).Infof("doFollowInMemoryMessage nil response")
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return
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}
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if resp.Message != nil {
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// process ctrl message or data message
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switch m := resp.Message.(type) {
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case *mq_pb.FollowInMemoryMessagesResponse_Data:
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// process data message
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print("d")
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case *mq_pb.FollowInMemoryMessagesResponse_Ctrl:
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// process ctrl message
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if m.Ctrl.FlushedSequence > 0 {
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flushTime := time.Unix(0, m.Ctrl.FlushedSequence)
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glog.V(0).Infof("doFollowInMemoryMessage flushTime: %v", flushTime)
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}
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if m.Ctrl.FollowerChangedToId != 0 {
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// follower changed
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glog.V(0).Infof("doFollowInMemoryMessage follower changed to %d", m.Ctrl.FollowerChangedToId)
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return
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}
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}
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}
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}
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}
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