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110 lines
3.3 KiB
110 lines
3.3 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/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/log_buffer"
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"time"
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)
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func (b *MessageQueueBroker) SubscribeMessage(req *mq_pb.SubscribeMessageRequest, stream mq_pb.SeaweedMessaging_SubscribeMessageServer) (err error) {
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ctx := stream.Context()
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clientName := fmt.Sprintf("%s/%s-%s", req.GetInit().ConsumerGroup, req.GetInit().ConsumerId, req.GetInit().ClientId)
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initMessage := req.GetInit()
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if initMessage == nil {
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glog.Errorf("missing init message")
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return fmt.Errorf("missing init message")
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}
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t := topic.FromPbTopic(req.GetInit().Topic)
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partition := topic.FromPbPartition(req.GetInit().GetPartitionOffset().GetPartition())
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glog.V(0).Infof("Subscriber %s on %v %v connected", req.GetInit().ConsumerId, t, partition)
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localTopicPartition, getOrGenErr := b.GetOrGenerateLocalPartition(t, partition)
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if getOrGenErr != nil {
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return getOrGenErr
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}
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localTopicPartition.Subscribers.AddSubscriber(clientName, topic.NewLocalSubscriber())
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glog.V(0).Infof("Subscriber %s connected on %v %v", clientName, t, partition)
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isConnected := true
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sleepIntervalCount := 0
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var counter int64
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defer func() {
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isConnected = false
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localTopicPartition.Subscribers.RemoveSubscriber(clientName)
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glog.V(0).Infof("Subscriber %s on %v %v disconnected, sent %d", clientName, t, partition, counter)
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if localTopicPartition.MaybeShutdownLocalPartition() {
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b.localTopicManager.RemoveLocalPartition(t, partition)
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}
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}()
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var startPosition log_buffer.MessagePosition
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if req.GetInit() != nil && req.GetInit().GetPartitionOffset() != nil {
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startPosition = getRequestPosition(req.GetInit().GetPartitionOffset())
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}
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return localTopicPartition.Subscribe(clientName, startPosition, func() bool {
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if !isConnected {
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return false
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}
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sleepIntervalCount++
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if sleepIntervalCount > 32 {
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sleepIntervalCount = 32
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}
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time.Sleep(time.Duration(sleepIntervalCount) * 137 * time.Millisecond)
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// Check if the client has disconnected by monitoring the context
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select {
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case <-ctx.Done():
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err := ctx.Err()
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if err == context.Canceled {
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// Client disconnected
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return false
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}
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glog.V(0).Infof("Subscriber %s disconnected: %v", clientName, err)
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return false
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default:
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// Continue processing the request
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}
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return true
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}, func(logEntry *filer_pb.LogEntry) (bool, error) {
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// reset the sleep interval count
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sleepIntervalCount = 0
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if err := stream.Send(&mq_pb.SubscribeMessageResponse{Message: &mq_pb.SubscribeMessageResponse_Data{
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Data: &mq_pb.DataMessage{
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Key: logEntry.Key,
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Value: logEntry.Data,
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TsNs: logEntry.TsNs,
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},
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}}); err != nil {
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glog.Errorf("Error sending data: %v", err)
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return false, err
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}
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counter++
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return false, nil
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})
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}
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func getRequestPosition(offset *mq_pb.PartitionOffset) (startPosition log_buffer.MessagePosition) {
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if offset.StartTsNs != 0 {
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startPosition = log_buffer.NewMessagePosition(offset.StartTsNs, -2)
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}
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if offset.StartType == mq_pb.PartitionOffsetStartType_EARLIEST {
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startPosition = log_buffer.NewMessagePosition(1, -3)
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} else if offset.StartType == mq_pb.PartitionOffsetStartType_LATEST {
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startPosition = log_buffer.NewMessagePosition(time.Now().UnixNano(), -4)
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}
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return
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}
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