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98 lines
2.8 KiB
98 lines
2.8 KiB
package weed_server
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import (
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"fmt"
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"time"
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"github.com/chrislusf/seaweedfs/weed/glog"
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"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
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"github.com/chrislusf/seaweedfs/weed/storage"
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"github.com/chrislusf/seaweedfs/weed/storage/needle"
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)
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func (vs *VolumeServer) VolumeTail(req *volume_server_pb.VolumeTailRequest, stream volume_server_pb.VolumeServer_VolumeTailServer) error {
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v := vs.store.GetVolume(needle.VolumeId(req.VolumeId))
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if v == nil {
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return fmt.Errorf("not found volume id %d", req.VolumeId)
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}
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defer glog.V(1).Infof("tailing volume %d finished", v.Id)
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lastTimestampNs := req.SinceNs
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drainingSeconds := req.DrainingSeconds
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for {
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lastProcessedTimestampNs, err := sendNeedlesSince(stream, v, lastTimestampNs)
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if err != nil {
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glog.Infof("sendNeedlesSince: %v", err)
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return fmt.Errorf("streamFollow: %v", err)
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}
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time.Sleep(2 * time.Second)
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if req.DrainingSeconds == 0 {
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lastTimestampNs = lastProcessedTimestampNs
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continue
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}
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if lastProcessedTimestampNs == lastTimestampNs {
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drainingSeconds--
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if drainingSeconds <= 0 {
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return nil
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}
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glog.V(1).Infof("tailing volume %d drains requests with %d seconds remaining", v.Id, drainingSeconds)
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} else {
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lastTimestampNs = lastProcessedTimestampNs
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drainingSeconds = req.DrainingSeconds
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glog.V(1).Infof("tailing volume %d resets draining wait time to %d seconds", v.Id, drainingSeconds)
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}
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}
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}
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func sendNeedlesSince(stream volume_server_pb.VolumeServer_VolumeTailServer, v *storage.Volume, lastTimestampNs uint64) (lastProcessedTimestampNs uint64, err error) {
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foundOffset, isLastOne, err := v.BinarySearchByAppendAtNs(lastTimestampNs)
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if err != nil {
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return 0, fmt.Errorf("fail to locate by appendAtNs %d: %s", lastTimestampNs, err)
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}
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// log.Printf("reading ts %d offset %d isLast %v", lastTimestampNs, foundOffset, isLastOne)
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if isLastOne {
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// need to heart beat to the client to ensure the connection health
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sendErr := stream.Send(&volume_server_pb.VolumeTailResponse{IsLastChunk: true})
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return lastTimestampNs, sendErr
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}
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err = storage.ScanVolumeFileNeedleFrom(v.Version(), v.DataFile(), foundOffset.ToAcutalOffset(), func(needleHeader, needleBody []byte, needleAppendAtNs uint64) error {
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blockSizeLimit := 1024 * 1024 * 2
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isLastChunk := false
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// need to send body by chunks
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for i := 0; i < len(needleBody); i += blockSizeLimit {
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stopOffset := i + blockSizeLimit
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if stopOffset >= len(needleBody) {
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isLastChunk = true
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stopOffset = len(needleBody)
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}
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sendErr := stream.Send(&volume_server_pb.VolumeTailResponse{
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NeedleHeader: needleHeader,
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NeedleBody: needleBody[i:stopOffset],
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IsLastChunk: isLastChunk,
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})
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if sendErr != nil {
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return sendErr
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}
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}
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lastProcessedTimestampNs = needleAppendAtNs
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return nil
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})
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return
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}
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