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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.Lock(fs.option.Host, req.Name, expiredAtNs, req.PreviousLockToken)
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{}
_, err = fs.filer.Dlm.Unlock(fs.option.Host, req.Name, req.LockToken)
if err != nil {
resp.Error = fmt.Sprintf("%v", err)
}
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(fs.option.Host, 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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