203 lines
3.8 KiB
Go
203 lines
3.8 KiB
Go
// Copyright 2015 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package boltdb
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import (
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"os"
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"path"
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"github.com/boltdb/bolt"
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"github.com/juju/errors"
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"github.com/pingcap/tidb/store/localstore/engine"
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"github.com/pingcap/tidb/util/bytes"
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)
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var (
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_ engine.DB = (*db)(nil)
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)
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var (
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bucketName = []byte("tidb")
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)
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type db struct {
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*bolt.DB
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}
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func (d *db) Get(key []byte) ([]byte, error) {
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var value []byte
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err := d.DB.View(func(tx *bolt.Tx) error {
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b := tx.Bucket(bucketName)
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v := b.Get(key)
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if v == nil {
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return errors.Trace(engine.ErrNotFound)
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}
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value = bytes.CloneBytes(v)
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return nil
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})
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return value, errors.Trace(err)
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}
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func (d *db) MultiSeek(keys [][]byte) []*engine.MSeekResult {
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res := make([]*engine.MSeekResult, 0, len(keys))
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d.DB.View(func(tx *bolt.Tx) error {
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b := tx.Bucket(bucketName)
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c := b.Cursor()
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for _, key := range keys {
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var k, v []byte
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if key == nil {
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k, v = c.First()
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} else {
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k, v = c.Seek(key)
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}
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r := &engine.MSeekResult{}
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if k == nil {
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r.Err = engine.ErrNotFound
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} else {
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r.Key, r.Value, r.Err = bytes.CloneBytes(k), bytes.CloneBytes(v), nil
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}
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res = append(res, r)
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}
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return nil
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})
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return res
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}
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func (d *db) Seek(startKey []byte) ([]byte, []byte, error) {
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var key, value []byte
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err := d.DB.View(func(tx *bolt.Tx) error {
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b := tx.Bucket(bucketName)
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c := b.Cursor()
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var k, v []byte
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if startKey == nil {
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k, v = c.First()
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} else {
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k, v = c.Seek(startKey)
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}
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if k != nil {
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key, value = bytes.CloneBytes(k), bytes.CloneBytes(v)
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}
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return nil
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})
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if err != nil {
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return nil, nil, errors.Trace(err)
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}
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if key == nil {
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return nil, nil, errors.Trace(engine.ErrNotFound)
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}
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return key, value, nil
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}
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func (d *db) NewBatch() engine.Batch {
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return &batch{}
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}
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func (d *db) Commit(b engine.Batch) error {
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bt, ok := b.(*batch)
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if !ok {
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return errors.Errorf("invalid batch type %T", b)
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}
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err := d.DB.Update(func(tx *bolt.Tx) error {
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b := tx.Bucket(bucketName)
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// err1 is used for passing `go tool vet --shadow` check.
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var err1 error
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for _, w := range bt.writes {
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if !w.isDelete {
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err1 = b.Put(w.key, w.value)
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} else {
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err1 = b.Delete(w.key)
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}
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if err1 != nil {
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return errors.Trace(err1)
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}
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}
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return nil
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})
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return errors.Trace(err)
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}
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func (d *db) Close() error {
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return d.DB.Close()
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}
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type write struct {
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key []byte
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value []byte
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isDelete bool
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}
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type batch struct {
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writes []write
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}
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func (b *batch) Put(key []byte, value []byte) {
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w := write{
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key: append([]byte(nil), key...),
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value: append([]byte(nil), value...),
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}
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b.writes = append(b.writes, w)
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}
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func (b *batch) Delete(key []byte) {
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w := write{
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key: append([]byte(nil), key...),
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value: nil,
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isDelete: true,
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}
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b.writes = append(b.writes, w)
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}
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func (b *batch) Len() int {
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return len(b.writes)
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}
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// Driver implements engine Driver.
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type Driver struct {
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}
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// Open opens or creates a local storage database with given path.
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func (driver Driver) Open(dbPath string) (engine.DB, error) {
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base := path.Dir(dbPath)
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os.MkdirAll(base, 0755)
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d, err := bolt.Open(dbPath, 0600, nil)
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if err != nil {
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return nil, err
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}
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tx, err := d.Begin(true)
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if err != nil {
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return nil, err
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}
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if _, err = tx.CreateBucketIfNotExists(bucketName); err != nil {
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tx.Rollback()
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return nil, err
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}
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if err = tx.Commit(); err != nil {
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return nil, err
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}
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return &db{d}, nil
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}
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