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package weed_server
import (
"context"
"fmt"
"time"
"github.com/seaweedfs/seaweedfs/weed/cluster/lock_manager"
"github.com/seaweedfs/seaweedfs/weed/glog"
"github.com/seaweedfs/seaweedfs/weed/pb"
"github.com/seaweedfs/seaweedfs/weed/pb/filer_pb"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
// DistributedLock is a grpc handler to handle FilerServer's LockRequest
func (fs *FilerServer) DistributedLock(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.LockOwner, resp.RenewToken, movedTo, err = fs.filer.Dlm.LockWithTimeout(req.Name, expiredAtNs, req.RenewToken, req.Owner)
glog.V(4).Infof("lock %s %v %v %v, isMoved=%v %v", req.Name, req.SecondsToLock, req.RenewToken, req.Owner, req.IsMoved, movedTo)
if movedTo != "" && movedTo != fs.option.Host && !req.IsMoved {
err = pb.WithFilerClient(false, 0, movedTo, fs.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
secondResp, err := client.DistributedLock(context.Background(), &filer_pb.LockRequest{
Name: req.Name,
SecondsToLock: req.SecondsToLock,
RenewToken: req.RenewToken,
IsMoved: true,
Owner: req.Owner,
})
if err == nil {
resp.RenewToken = secondResp.RenewToken
resp.LockOwner = secondResp.LockOwner
resp.Error = secondResp.Error
}
return err
})
}
if err != nil {
resp.Error = fmt.Sprintf("%v", err)
}
if movedTo != "" {
resp.LockHostMovedTo = string(movedTo)
}
return resp, nil
}
// Unlock is a grpc handler to handle FilerServer's UnlockRequest
func (fs *FilerServer) DistributedUnlock(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.DistributedUnlock(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
}
func (fs *FilerServer) FindLockOwner(ctx context.Context, req *filer_pb.FindLockOwnerRequest) (*filer_pb.FindLockOwnerResponse, error) {
owner, movedTo, err := fs.filer.Dlm.FindLockOwner(req.Name)
if !req.IsMoved && movedTo != "" || err == lock_manager.LockNotFound {
err = pb.WithFilerClient(false, 0, movedTo, fs.grpcDialOption, func(client filer_pb.SeaweedFilerClient) error {
secondResp, err := client.FindLockOwner(context.Background(), &filer_pb.FindLockOwnerRequest{
Name: req.Name,
IsMoved: true,
})
if err != nil {
return err
}
owner = secondResp.Owner
return nil
})
if err != nil {
return nil, err
}
}
if owner == "" {
glog.V(0).Infof("find lock %s moved to %v: %v", req.Name, movedTo, err)
return nil, status.Error(codes.NotFound, fmt.Sprintf("lock %s not found", req.Name))
}
if err != nil {
return nil, status.Error(codes.Internal, err.Error())
}
return &filer_pb.FindLockOwnerResponse{
Owner: owner,
}, 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, lock.Owner)
}
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,
Owner: lock.Owner,
},
},
})
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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