// waitOnLowest will wait on the last key with a revision < rwm.myKey.Revision with a
// given prefix. If there are no keys left to wait on, return true.
func (rwm *RWMutex) waitOnLastRev(pfx string) (bool, error) {
client := rwm.s.Client()
// get key that's blocking myKey
opts := append(v3.WithLastRev(), v3.WithMaxModRev(rwm.myKey.Revision()-1))
lastKey, err := client.Get(rwm.ctx, pfx, opts...)
if err != nil {
return false, err
}
if len(lastKey.Kvs) == 0 {
return true, nil
}
// wait for release on blocking key
_, err = WaitEvents(
client,
string(lastKey.Kvs[0].Key),
rwm.myKey.Revision(),
[]mvccpb.Event_EventType{mvccpb.DELETE})
return false, err
}
func RangeRequestToOp(r *pb.RangeRequest) clientv3.Op {
opts := []clientv3.OpOption{}
if len(r.RangeEnd) != 0 {
opts = append(opts, clientv3.WithRange(string(r.RangeEnd)))
}
opts = append(opts, clientv3.WithRev(r.Revision))
opts = append(opts, clientv3.WithLimit(r.Limit))
opts = append(opts, clientv3.WithSort(
clientv3.SortTarget(r.SortTarget),
clientv3.SortOrder(r.SortOrder)),
)
opts = append(opts, clientv3.WithMaxCreateRev(r.MaxCreateRevision))
opts = append(opts, clientv3.WithMinCreateRev(r.MinCreateRevision))
opts = append(opts, clientv3.WithMaxModRev(r.MaxModRevision))
opts = append(opts, clientv3.WithMinModRev(r.MinModRevision))
if r.Serializable {
opts = append(opts, clientv3.WithSerializable())
}
return clientv3.OpGet(string(r.Key), opts...)
}