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package weed_server
import ( "context" "fmt" "github.com/seaweedfs/seaweedfs/weed/glog" "github.com/seaweedfs/seaweedfs/weed/pb" "github.com/seaweedfs/seaweedfs/weed/pb/filer_pb" "time" )
// Lock is a grpc handler to handle FilerServer's LockRequest
func (fs *FilerServer) Lock(ctx context.Context, req *filer_pb.LockRequest) (resp *filer_pb.LockResponse, err error) {
resp = &filer_pb.LockResponse{}
var movedTo pb.ServerAddress expiredAtNs := time.Now().Add(time.Duration(req.SecondsToLock) * time.Second).UnixNano() resp.RenewToken, movedTo, err = fs.filer.Dlm.LockWithTimeout(req.Name, expiredAtNs, req.RenewToken) if !req.IsMoved && movedTo != "" { err = pb.WithFilerClient(false, 0, movedTo, fs.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error { secondResp, err := client.Lock(context.Background(), &filer_pb.LockRequest{ Name: req.Name, SecondsToLock: req.SecondsToLock, RenewToken: req.RenewToken, IsMoved: true, }) if err == nil { resp.RenewToken = secondResp.RenewToken } else { resp.Error = secondResp.Error } return err }) }
if err != nil { resp.Error = fmt.Sprintf("%v", err) } if movedTo != "" { resp.MovedTo = string(movedTo) }
return resp, nil }
// Unlock is a grpc handler to handle FilerServer's UnlockRequest
func (fs *FilerServer) Unlock(ctx context.Context, req *filer_pb.UnlockRequest) (resp *filer_pb.UnlockResponse, err error) {
resp = &filer_pb.UnlockResponse{}
var movedTo pb.ServerAddress movedTo, err = fs.filer.Dlm.Unlock(req.Name, req.RenewToken)
if !req.IsMoved && movedTo != "" { err = pb.WithFilerClient(false, 0, movedTo, fs.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error { secondResp, err := client.Unlock(context.Background(), &filer_pb.UnlockRequest{ Name: req.Name, RenewToken: req.RenewToken, IsMoved: true, }) resp.Error = secondResp.Error return err }) }
if err != nil { resp.Error = fmt.Sprintf("%v", err) } if movedTo != "" { resp.MovedTo = string(movedTo) }
return resp, nil
}
// TransferLocks is a grpc handler to handle FilerServer's TransferLocksRequest
func (fs *FilerServer) TransferLocks(ctx context.Context, req *filer_pb.TransferLocksRequest) (*filer_pb.TransferLocksResponse, error) {
for _, lock := range req.Locks { fs.filer.Dlm.InsertLock(lock.Name, lock.ExpiredAtNs, lock.RenewToken) }
return &filer_pb.TransferLocksResponse{}, nil
}
func (fs *FilerServer) OnDlmChangeSnapshot(snapshot []pb.ServerAddress) { locks := fs.filer.Dlm.SelectNotOwnedLocks(snapshot) if len(locks) == 0 { return }
for _, lock := range locks { server := fs.filer.Dlm.CalculateTargetServer(lock.Key, snapshot) if err := pb.WithFilerClient(false, 0, server, fs.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error { _, err := client.TransferLocks(context.Background(), &filer_pb.TransferLocksRequest{ Locks: []*filer_pb.Lock{ { Name: lock.Key, RenewToken: lock.Token, ExpiredAtNs: lock.ExpiredAtNs, }, }, }) return err }); err != nil { // it may not be worth retrying, since the lock may have expired
glog.Errorf("transfer lock %v to %v: %v", lock.Key, server, err) } }
}
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