forked from cerc-io/plugeth
131 lines
3.9 KiB
Go
131 lines
3.9 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 shed provides a simple abstraction components to compose
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// more complex operations on storage data organized in fields and indexes.
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//
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// Only type which holds logical information about swarm storage chunks data
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// and metadata is IndexItem. This part is not generalized mostly for
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// performance reasons.
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package shed
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import (
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"github.com/ethereum/go-ethereum/metrics"
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"github.com/syndtr/goleveldb/leveldb"
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"github.com/syndtr/goleveldb/leveldb/iterator"
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"github.com/syndtr/goleveldb/leveldb/opt"
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)
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// The limit for LevelDB OpenFilesCacheCapacity.
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const openFileLimit = 128
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// DB provides abstractions over LevelDB in order to
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// implement complex structures using fields and ordered indexes.
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// It provides a schema functionality to store fields and indexes
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// information about naming and types.
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type DB struct {
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ldb *leveldb.DB
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}
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// NewDB constructs a new DB and validates the schema
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// if it exists in database on the given path.
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func NewDB(path string) (db *DB, err error) {
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ldb, err := leveldb.OpenFile(path, &opt.Options{
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OpenFilesCacheCapacity: openFileLimit,
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})
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if err != nil {
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return nil, err
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}
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db = &DB{
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ldb: ldb,
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}
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if _, err = db.getSchema(); err != nil {
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if err == leveldb.ErrNotFound {
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// save schema with initialized default fields
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if err = db.putSchema(schema{
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Fields: make(map[string]fieldSpec),
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Indexes: make(map[byte]indexSpec),
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}); err != nil {
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return nil, err
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}
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} else {
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return nil, err
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}
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}
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return db, nil
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}
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// Put wraps LevelDB Put method to increment metrics counter.
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func (db *DB) Put(key []byte, value []byte) (err error) {
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err = db.ldb.Put(key, value, nil)
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if err != nil {
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metrics.GetOrRegisterCounter("DB.putFail", nil).Inc(1)
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return err
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}
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metrics.GetOrRegisterCounter("DB.put", nil).Inc(1)
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return nil
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}
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// Get wraps LevelDB Get method to increment metrics counter.
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func (db *DB) Get(key []byte) (value []byte, err error) {
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value, err = db.ldb.Get(key, nil)
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if err != nil {
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if err == leveldb.ErrNotFound {
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metrics.GetOrRegisterCounter("DB.getNotFound", nil).Inc(1)
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} else {
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metrics.GetOrRegisterCounter("DB.getFail", nil).Inc(1)
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}
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return nil, err
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}
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metrics.GetOrRegisterCounter("DB.get", nil).Inc(1)
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return value, nil
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}
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// Delete wraps LevelDB Delete method to increment metrics counter.
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func (db *DB) Delete(key []byte) (err error) {
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err = db.ldb.Delete(key, nil)
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if err != nil {
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metrics.GetOrRegisterCounter("DB.deleteFail", nil).Inc(1)
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return err
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}
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metrics.GetOrRegisterCounter("DB.delete", nil).Inc(1)
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return nil
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}
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// NewIterator wraps LevelDB NewIterator method to increment metrics counter.
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func (db *DB) NewIterator() iterator.Iterator {
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metrics.GetOrRegisterCounter("DB.newiterator", nil).Inc(1)
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return db.ldb.NewIterator(nil, nil)
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}
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// WriteBatch wraps LevelDB Write method to increment metrics counter.
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func (db *DB) WriteBatch(batch *leveldb.Batch) (err error) {
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err = db.ldb.Write(batch, nil)
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if err != nil {
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metrics.GetOrRegisterCounter("DB.writebatchFail", nil).Inc(1)
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return err
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}
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metrics.GetOrRegisterCounter("DB.writebatch", nil).Inc(1)
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return nil
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}
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// Close closes LevelDB database.
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func (db *DB) Close() (err error) {
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return db.ldb.Close()
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}
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