151 lines
4.8 KiB
Go
151 lines
4.8 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 rawdb
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import (
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"github.com/ethereum/go-ethereum/ethdb"
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)
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// table is a wrapper around a database that prefixes each key access with a pre-
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// configured string.
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type table struct {
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db ethdb.Database
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prefix string
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}
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// NewTable returns a database object that prefixes all keys with a given string.
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func NewTable(db ethdb.Database, prefix string) ethdb.Database {
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return &table{
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db: db,
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prefix: prefix,
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}
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}
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// Close is a noop to implement the Database interface.
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func (t *table) Close() error {
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return nil
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}
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// Has retrieves if a prefixed version of a key is present in the database.
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func (t *table) Has(key []byte) (bool, error) {
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return t.db.Has(append([]byte(t.prefix), key...))
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}
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// Get retrieves the given prefixed key if it's present in the database.
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func (t *table) Get(key []byte) ([]byte, error) {
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return t.db.Get(append([]byte(t.prefix), key...))
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}
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// Put inserts the given value into the database at a prefixed version of the
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// provided key.
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func (t *table) Put(key []byte, value []byte) error {
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return t.db.Put(append([]byte(t.prefix), key...), value)
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}
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// Delete removes the given prefixed key from the database.
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func (t *table) Delete(key []byte) error {
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return t.db.Delete(append([]byte(t.prefix), key...))
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}
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// NewIterator creates a binary-alphabetical iterator over the entire keyspace
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// contained within the database.
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func (t *table) NewIterator() ethdb.Iterator {
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return t.NewIteratorWithPrefix(nil)
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}
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// NewIteratorWithPrefix creates a binary-alphabetical iterator over a subset
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// of database content with a particular key prefix.
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func (t *table) NewIteratorWithPrefix(prefix []byte) ethdb.Iterator {
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return t.db.NewIteratorWithPrefix(append([]byte(t.prefix), prefix...))
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}
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// Stat returns a particular internal stat of the database.
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func (t *table) Stat(property string) (string, error) {
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return t.db.Stat(property)
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}
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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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func (t *table) Compact(start []byte, limit []byte) error {
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// If no start was specified, use the table prefix as the first value
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if start == nil {
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start = []byte(t.prefix)
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}
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// If no limit was specified, use the first element not matching the prefix
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// as the limit
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if limit == nil {
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limit = []byte(t.prefix)
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for i := len(limit) - 1; i >= 0; i-- {
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// Bump the current character, stopping if it doesn't overflow
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limit[i]++
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if limit[i] > 0 {
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break
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}
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// Character overflown, proceed to the next or nil if the last
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if i == 0 {
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limit = nil
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}
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}
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}
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// Range correctly calculated based on table prefix, delegate down
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return t.db.Compact(start, limit)
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}
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// NewBatch creates a write-only database that buffers changes to its host db
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// until a final write is called, each operation prefixing all keys with the
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// pre-configured string.
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func (t *table) NewBatch() ethdb.Batch {
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return &tableBatch{t.db.NewBatch(), t.prefix}
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}
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// tableBatch is a wrapper around a database batch that prefixes each key access
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// with a pre-configured string.
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type tableBatch struct {
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batch ethdb.Batch
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prefix string
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}
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// Put inserts the given value into the batch for later committing.
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func (b *tableBatch) Put(key, value []byte) error {
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return b.batch.Put(append([]byte(b.prefix), key...), value)
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}
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// Delete inserts the a key removal into the batch for later committing.
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func (b *tableBatch) Delete(key []byte) error {
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return b.batch.Delete(append([]byte(b.prefix), key...))
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}
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// ValueSize retrieves the amount of data queued up for writing.
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func (b *tableBatch) ValueSize() int {
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return b.batch.ValueSize()
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}
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// Write flushes any accumulated data to disk.
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func (b *tableBatch) Write() error {
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return b.batch.Write()
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}
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// Reset resets the batch for reuse.
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func (b *tableBatch) Reset() {
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b.batch.Reset()
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}
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