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package db
import (
"bytes"
"encoding/json"
"github.com/boltdb/bolt"
)
// Index gets the value from the namespace at the key provided
func Index(namespace, key string) ([]byte, error) {
val := &bytes.Buffer{}
err := store.View(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte(index(namespace)))
if b == nil {
return nil
}
v := b.Get([]byte(key))
_, err := val.Write(v)
if err != nil {
return err
}
return nil
})
if err != nil {
return nil, err
}
return val.Bytes(), nil
}
// SetIndex sets a key/value pair within the namespace provided and will return
// an error if it fails
func SetIndex(namespace, key string, value interface{}) error {
return store.Update(func(tx *bolt.Tx) error {
b, err := tx.CreateBucketIfNotExists([]byte(index(namespace)))
if err != nil {
return err
}
val, err := json.Marshal(value)
if err != nil {
return err
}
return b.Put([]byte(key), val)
})
}
// DeleteIndex removes the key and value from the namespace provided and will
// return an error if it fails. It will return nil if there was no key/value in
// the index to delete.
func DeleteIndex(namespace, key string) error {
return store.Update(func(tx *bolt.Tx) error {
b := tx.Bucket([]byte(index(namespace)))
if b == nil {
return nil
}
return b.Delete([]byte(key))
})
}
// DropIndex removes the index and all key/value pairs in the namespace index
func DropIndex(namespace string) error {
return store.Update(func(tx *bolt.Tx) error {
err := tx.DeleteBucket([]byte(index(namespace)))
if err == bolt.ErrBucketNotFound {
return nil
}
if err != nil {
return err
}
return nil
})
}
func index(namespace string) string {
return "__index_" + namespace
}
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