86 lines
2.7 KiB
Go
86 lines
2.7 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 database defines the interfaces for an Ethereum data store.
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package ethdb
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import "io"
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// Reader wraps the Has and Get method of a backing data store.
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type Reader interface {
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// Has retrieves if a key is present in the key-value data store.
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Has(key []byte) (bool, error)
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// Get retrieves the given key if it's present in the key-value data store.
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Get(key []byte) ([]byte, error)
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}
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// Writer wraps the Put method of a backing data store.
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type Writer interface {
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// Put inserts the given value into the key-value data store.
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Put(key []byte, value []byte) error
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}
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// Deleter wraps the Delete method of a backing data store.
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type Deleter interface {
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// Delete removes the key from the key-value data store.
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Delete(key []byte) error
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}
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// Stater wraps the Stat method of a backing data store.
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type Stater interface {
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// Stat returns a particular internal stat of the database.
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Stat(property string) (string, error)
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}
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// Compacter wraps the Compact method of a backing data store.
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type Compacter interface {
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// Compact flattens the underlying data store for the given key range. In essence,
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// deleted and overwritten versions are discarded, and the data is rearranged to
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// reduce the cost of operations needed to access them.
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//
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// A nil start is treated as a key before all keys in the data store; a nil limit
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// is treated as a key after all keys in the data store. If both is nil then it
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// will compact entire data store.
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Compact(start []byte, limit []byte) error
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}
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// KeyValueStore contains all the methods required to allow handling different
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// key-value data stores backing the high level database.
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type KeyValueStore interface {
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Reader
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Writer
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Deleter
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Batcher
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Iteratee
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Stater
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Compacter
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io.Closer
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}
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// Database contains all the methods required by the high level database to not
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// only access the key-value data store but also the chain freezer.
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type Database interface {
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Reader
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Writer
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Deleter
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Batcher
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Iteratee
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Stater
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Compacter
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io.Closer
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}
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