146 lines
3.1 KiB
Go
146 lines
3.1 KiB
Go
package storm
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import (
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"reflect"
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"github.com/coreos/bbolt"
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)
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// KeyValueStore can store and fetch values by key
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type KeyValueStore interface {
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// Get a value from a bucket
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Get(bucketName string, key interface{}, to interface{}) error
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// Set a key/value pair into a bucket
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Set(bucketName string, key interface{}, value interface{}) error
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// Delete deletes a key from a bucket
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Delete(bucketName string, key interface{}) error
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// GetBytes gets a raw value from a bucket.
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GetBytes(bucketName string, key interface{}) ([]byte, error)
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// SetBytes sets a raw value into a bucket.
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SetBytes(bucketName string, key interface{}, value []byte) error
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}
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// GetBytes gets a raw value from a bucket.
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func (n *node) GetBytes(bucketName string, key interface{}) ([]byte, error) {
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id, err := toBytes(key, n.codec)
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if err != nil {
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return nil, err
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}
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var val []byte
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return val, n.readTx(func(tx *bolt.Tx) error {
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raw, err := n.getBytes(tx, bucketName, id)
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if err != nil {
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return err
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}
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val = make([]byte, len(raw))
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copy(val, raw)
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return nil
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})
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}
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// GetBytes gets a raw value from a bucket.
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func (n *node) getBytes(tx *bolt.Tx, bucketName string, id []byte) ([]byte, error) {
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bucket := n.GetBucket(tx, bucketName)
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if bucket == nil {
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return nil, ErrNotFound
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}
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raw := bucket.Get(id)
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if raw == nil {
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return nil, ErrNotFound
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}
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return raw, nil
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}
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// SetBytes sets a raw value into a bucket.
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func (n *node) SetBytes(bucketName string, key interface{}, value []byte) error {
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if key == nil {
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return ErrNilParam
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}
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id, err := toBytes(key, n.codec)
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if err != nil {
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return err
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}
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return n.readWriteTx(func(tx *bolt.Tx) error {
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return n.setBytes(tx, bucketName, id, value)
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})
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}
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func (n *node) setBytes(tx *bolt.Tx, bucketName string, id, data []byte) error {
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bucket, err := n.CreateBucketIfNotExists(tx, bucketName)
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if err != nil {
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return err
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}
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// save node configuration in the bucket
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_, err = newMeta(bucket, n)
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if err != nil {
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return err
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}
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return bucket.Put(id, data)
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}
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// Get a value from a bucket
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func (n *node) Get(bucketName string, key interface{}, to interface{}) error {
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ref := reflect.ValueOf(to)
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if !ref.IsValid() || ref.Kind() != reflect.Ptr {
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return ErrPtrNeeded
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}
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id, err := toBytes(key, n.codec)
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if err != nil {
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return err
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}
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return n.readTx(func(tx *bolt.Tx) error {
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raw, err := n.getBytes(tx, bucketName, id)
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if err != nil {
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return err
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}
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return n.codec.Unmarshal(raw, to)
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})
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}
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// Set a key/value pair into a bucket
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func (n *node) Set(bucketName string, key interface{}, value interface{}) error {
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var data []byte
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var err error
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if value != nil {
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data, err = n.codec.Marshal(value)
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if err != nil {
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return err
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}
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}
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return n.SetBytes(bucketName, key, data)
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}
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// Delete deletes a key from a bucket
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func (n *node) Delete(bucketName string, key interface{}) error {
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id, err := toBytes(key, n.codec)
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if err != nil {
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return err
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}
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return n.readWriteTx(func(tx *bolt.Tx) error {
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return n.delete(tx, bucketName, id)
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})
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}
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func (n *node) delete(tx *bolt.Tx, bucketName string, id []byte) error {
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bucket := n.GetBucket(tx, bucketName)
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if bucket == nil {
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return ErrNotFound
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}
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return bucket.Delete(id)
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}
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