seaweedfs/weed/server/volume_grpc_follow.go

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package weed_server
import (
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"context"
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"fmt"
"github.com/chrislusf/seaweedfs/weed/storage/types"
"io"
"os"
"github.com/chrislusf/seaweedfs/weed/pb/volume_server_pb"
"github.com/chrislusf/seaweedfs/weed/storage"
)
func (vs *VolumeServer) VolumeFollow(req *volume_server_pb.VolumeFollowRequest, stream volume_server_pb.VolumeServer_VolumeFollowServer) error {
v := vs.store.GetVolume(storage.VolumeId(req.VolumeId))
if v == nil {
return fmt.Errorf("not found volume id %d", req.VolumeId)
}
stopOffset := v.Size()
foundOffset, isLastOne, err := v.BinarySearchByAppendAtNs(req.Since)
if err != nil {
return fmt.Errorf("fail to locate by appendAtNs %d: %s", req.Since, err)
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}
if isLastOne {
return nil
}
startOffset := int64(foundOffset) * int64(types.NeedlePaddingSize)
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buf := make([]byte, 1024*1024*2)
return sendFileContent(v.DataFile(), buf, startOffset, stopOffset, stream)
}
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func (vs *VolumeServer) VolumeSyncStatus(ctx context.Context, req *volume_server_pb.VolumeSyncStatusRequest) (*volume_server_pb.VolumeSyncStatusResponse, error) {
v := vs.store.GetVolume(storage.VolumeId(req.VolumeId))
if v == nil {
return nil, fmt.Errorf("not found volume id %d", req.VolumeId)
}
resp := v.GetVolumeSyncStatus()
return resp, nil
}
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func sendFileContent(datFile *os.File, buf []byte, startOffset, stopOffset int64, stream volume_server_pb.VolumeServer_VolumeFollowServer) error {
var blockSizeLimit = int64(len(buf))
for i := int64(0); i < stopOffset-startOffset; i += blockSizeLimit {
n, readErr := datFile.ReadAt(buf, startOffset+i)
if readErr == nil || readErr == io.EOF {
resp := &volume_server_pb.VolumeFollowResponse{}
resp.FileContent = buf[:int64(n)]
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sendErr := stream.Send(resp)
if sendErr != nil {
return sendErr
}
} else {
return readErr
}
}
return nil
}