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shared_var.go
48 lines (41 loc) · 1.14 KB
/
shared_var.go
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package store
import (
"errors"
bolt "go.etcd.io/bbolt"
)
// ErrNoSharedVar is returned by Store.SharedVar when there is no such variable.
var ErrNoSharedVar = errors.New("no such shared variable")
func init() {
initDB["initialize shared variable table"] = func(tx *bolt.Tx) error {
_, err := tx.CreateBucketIfNotExists([]byte(bucketSharedVar))
return err
}
}
// SharedVar gets the value of a shared variable.
func (s *dbStore) SharedVar(n string) (string, error) {
var value string
err := s.db.View(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte(bucketSharedVar))
v := b.Get([]byte(n))
if v == nil {
return ErrNoSharedVar
}
value = string(v)
return nil
})
return value, err
}
// SetSharedVar sets the value of a shared variable.
func (s *dbStore) SetSharedVar(n, v string) error {
return s.db.Update(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte(bucketSharedVar))
return b.Put([]byte(n), []byte(v))
})
}
// DelSharedVar deletes a shared variable.
func (s *dbStore) DelSharedVar(n string) error {
return s.db.Update(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte(bucketSharedVar))
return b.Delete([]byte(n))
})
}