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78 lines
2.1 KiB
Go
78 lines
2.1 KiB
Go
// Copyright 2018 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package intervals
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import (
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"github.com/syndtr/goleveldb/leveldb"
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)
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// DBStore uses LevelDB to store intervals.
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type DBStore struct {
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db *leveldb.DB
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}
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// NewDBStore creates a new instance of DBStore.
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func NewDBStore(path string) (s *DBStore, err error) {
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db, err := leveldb.OpenFile(path, nil)
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if err != nil {
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return nil, err
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}
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return &DBStore{
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db: db,
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}, nil
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}
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// Get retrieves Intervals for a specific key. If there is no Intervals
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// ErrNotFound is returned.
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func (s *DBStore) Get(key string) (i *Intervals, err error) {
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k := []byte(key)
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has, err := s.db.Has(k, nil)
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if err != nil {
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return nil, ErrNotFound
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}
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if !has {
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return nil, ErrNotFound
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}
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data, err := s.db.Get(k, nil)
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if err == leveldb.ErrNotFound {
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err = ErrNotFound
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}
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i = &Intervals{}
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if err = i.UnmarshalBinary(data); err != nil {
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return nil, err
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}
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return i, err
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}
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// Put stores Intervals for a specific key.
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func (s *DBStore) Put(key string, i *Intervals) (err error) {
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data, err := i.MarshalBinary()
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if err != nil {
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return err
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}
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return s.db.Put([]byte(key), data, nil)
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}
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// Delete removes Intervals stored under a specific key.
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func (s *DBStore) Delete(key string) (err error) {
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return s.db.Delete([]byte(key), nil)
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}
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// Close releases the resources used by the underlying LevelDB.
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func (s *DBStore) Close() error {
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return s.db.Close()
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}
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