120 lines
3.8 KiB
Go
120 lines
3.8 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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"fmt"
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"github.com/ethereum/go-ethereum/ethdb"
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"github.com/ethereum/go-ethereum/ethdb/leveldb"
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"github.com/ethereum/go-ethereum/ethdb/memorydb"
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)
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// freezerdb is a databse wrapper that enabled freezer data retrievals.
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type freezerdb struct {
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ethdb.KeyValueStore
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ethdb.AncientStore
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}
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// Close implements io.Closer, closing both the fast key-value store as well as
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// the slow ancient tables.
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func (frdb *freezerdb) Close() error {
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var errs []error
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if err := frdb.KeyValueStore.Close(); err != nil {
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errs = append(errs, err)
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}
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if err := frdb.AncientStore.Close(); err != nil {
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errs = append(errs, err)
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}
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if len(errs) != 0 {
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return fmt.Errorf("%v", errs)
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}
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return nil
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}
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// nofreezedb is a database wrapper that disables freezer data retrievals.
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type nofreezedb struct {
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ethdb.KeyValueStore
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}
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// Frozen returns nil as we don't have a backing chain freezer.
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func (db *nofreezedb) Ancient(kind string, number uint64) ([]byte, error) {
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return nil, errOutOfBounds
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}
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// NewDatabase creates a high level database on top of a given key-value data
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// store without a freezer moving immutable chain segments into cold storage.
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func NewDatabase(db ethdb.KeyValueStore) ethdb.Database {
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return &nofreezedb{
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KeyValueStore: db,
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}
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}
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// NewDatabaseWithFreezer creates a high level database on top of a given key-
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// value data store with a freezer moving immutable chain segments into cold
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// storage.
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func NewDatabaseWithFreezer(db ethdb.KeyValueStore, freezer string, namespace string) (ethdb.Database, error) {
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frdb, err := newFreezer(freezer, namespace)
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if err != nil {
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return nil, err
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}
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go frdb.freeze(db)
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return &freezerdb{
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KeyValueStore: db,
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AncientStore: frdb,
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}, nil
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}
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// NewMemoryDatabase creates an ephemeral in-memory key-value database without a
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// freezer moving immutable chain segments into cold storage.
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func NewMemoryDatabase() ethdb.Database {
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return NewDatabase(memorydb.New())
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}
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// NewMemoryDatabaseWithCap creates an ephemeral in-memory key-value database
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// with an initial starting capacity, but without a freezer moving immutable
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// chain segments into cold storage.
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func NewMemoryDatabaseWithCap(size int) ethdb.Database {
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return NewDatabase(memorydb.NewWithCap(size))
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}
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// NewLevelDBDatabase creates a persistent key-value database without a freezer
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// moving immutable chain segments into cold storage.
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func NewLevelDBDatabase(file string, cache int, handles int, namespace string) (ethdb.Database, error) {
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db, err := leveldb.New(file, cache, handles, namespace)
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if err != nil {
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return nil, err
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}
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return NewDatabase(db), nil
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}
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// NewLevelDBDatabaseWithFreezer creates a persistent key-value database with a
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// freezer moving immutable chain segments into cold storage.
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func NewLevelDBDatabaseWithFreezer(file string, cache int, handles int, freezer string, namespace string) (ethdb.Database, error) {
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kvdb, err := leveldb.New(file, cache, handles, namespace)
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if err != nil {
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return nil, err
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}
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frdb, err := NewDatabaseWithFreezer(kvdb, freezer, namespace)
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if err != nil {
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kvdb.Close()
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return nil, err
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}
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return frdb, nil
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}
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