/
meta_storage.go
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/
meta_storage.go
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// Copyright 2018 The kingbus Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package storage
import (
"encoding/binary"
"path"
"encoding/json"
"bytes"
"strings"
"strconv"
"fmt"
bolt "github.com/coreos/bbolt"
pb "github.com/coreos/etcd/raft/raftpb"
"github.com/flike/kingbus/log"
"github.com/flike/kingbus/utils"
gomysql "github.com/siddontang/go-mysql/mysql"
)
const (
//MetadataFile is the file name of storage metadata
MetadataFile = "kingbus_meta.db"
//BucketName is the bucket name using in bolt db
BucketName = "kingbus_meta_bucket"
)
//MetaStore is a metadata store
type MetaStore struct {
DB *bolt.DB
Dir string
BucketName []byte
}
//NewMetaStore create a meta store
func NewMetaStore(dir string) (*MetaStore, error) {
if len(dir) == 0 {
return nil, ErrArgsIllegal
}
dbFilePath := path.Join(dir, MetadataFile)
db, err := bolt.Open(dbFilePath, 0600, nil)
if err != nil {
log.Log.Errorf("[stable_bolt.go-NewBoltDBStore]:bolt Open error,err:%s,dbpath:%s", err.Error(), dbFilePath)
return nil, err
}
s := &MetaStore{
Dir: dir,
DB: db,
BucketName: []byte(BucketName),
}
err = s.init()
if err != nil {
s.Close2()
return nil, err
}
return s, nil
}
//create bucket if not exist
func (s *MetaStore) init() error {
return s.DB.Update(func(tx *bolt.Tx) error {
_, err := tx.CreateBucketIfNotExists(s.BucketName)
if err != nil {
log.Log.Errorf("CreateBucketIfNotExists error:error=%s,BucketName=%s",
err.Error(), string(s.BucketName))
return err
}
log.Log.Debugf("create bucket:%s success", BucketName)
return nil
})
}
//Get value by key
func (s *MetaStore) Get(key []byte) ([]byte, error) {
if len(key) == 0 {
return nil, ErrKeyIsNil
}
var data []byte
err := s.DB.View(func(tx *bolt.Tx) error {
bucket := tx.Bucket(s.BucketName)
val := bucket.Get(key)
if val != nil {
data = make([]byte, len(val))
copy(data, val)
}
return nil
})
if err != nil {
return nil, err
}
return data, nil
}
//Set value by key
func (s *MetaStore) Set(key []byte, value []byte) error {
return s.DB.Update(func(tx *bolt.Tx) error {
b := tx.Bucket(s.BucketName)
err := b.Put(key, value)
if err != nil {
log.Log.Errorf("MetaStore Set error,err:%s,key:%s", err.Error(), string(key))
return err
}
return nil
})
}
//Delete key
func (s *MetaStore) Delete(key []byte) error {
return s.DB.Update(func(tx *bolt.Tx) error {
b := tx.Bucket(s.BucketName)
err := b.Delete(key)
if err != nil {
log.Log.Errorf("MetaStore Delete error,err:%s,key:%s", err.Error(), string(key))
return err
}
return nil
})
}
//InitialState init raft state
func (s *MetaStore) InitialState() (pb.HardState, pb.ConfState, error) {
var hs pb.HardState
var cs pb.ConfState
hsValue, err := s.Get(utils.StringToBytes(HardStateKey))
if err != nil {
return pb.HardState{}, pb.ConfState{}, err
}
if hsValue != nil {
err = json.Unmarshal(hsValue, &hs)
if err != nil {
log.Log.Errorf("MetaStore:initialState json Unmarshal error,err:%s,hsKey:%s,hsValue:%s",
err.Error(), HardStateKey, utils.BytesToString(hsValue))
return pb.HardState{}, pb.ConfState{}, err
}
}
csValue, err := s.Get(utils.StringToBytes(ConfStateKey))
if err != nil {
return pb.HardState{}, pb.ConfState{}, err
}
if csValue != nil {
err = json.Unmarshal(csValue, &cs)
if err != nil {
log.Log.Errorf("MetaStore:initialState json Unmarshal error,err:%s,csKey:%s,csValue:%s",
err.Error(), ConfStateKey, utils.BytesToString(csValue))
return pb.HardState{}, pb.ConfState{}, err
}
}
return hs, cs, nil
}
//SaveHardState save hard state in raft
func (s *MetaStore) SaveHardState(st pb.HardState) error {
value, err := json.Marshal(st)
if err != nil {
log.Log.Errorf("MetaStore:saveHardState error,err:%s,HardState:%v", err.Error(), st)
return err
}
err = s.Set(utils.StringToBytes(HardStateKey), value)
if err != nil {
log.Log.Errorf("MetaStore:saveHardState error,err:%s,key:%s,value:%s",
err.Error(), HardStateKey, utils.BytesToString(value))
return err
}
return nil
}
//SetGtidSet set mysql gtid
func (s *MetaStore) SetGtidSet(flavor string, key string, gtidSet gomysql.GTIDSet) error {
flavorKey := path.Join(flavor, key)
value := gtidSet.Encode()
err := s.Set(utils.StringToBytes(flavorKey), value)
if err != nil {
log.Log.Errorf("MetaStore:SetGtidSet error,err:%s,key:%s,value:%s",
err, key, gtidSet.String())
return err
}
return nil
}
//SetBinlogProgress save appliedIndex and executedGtidSet at the same time
func (s *MetaStore) SetBinlogProgress(appliedIndex uint64, executedGtidSet gomysql.GTIDSet) error {
gtidsKey := utils.StringToBytes(path.Join(gomysql.MySQLFlavor, ExecutedGtidSetKey))
gtidsValue := executedGtidSet.Encode()
appliedIndexKey := utils.StringToBytes(AppliedIndexKey)
appliedIndexValue := make([]byte, 8)
binary.BigEndian.PutUint64(appliedIndexValue, appliedIndex)
return s.DB.Update(func(tx *bolt.Tx) error {
b := tx.Bucket(s.BucketName)
err := b.Put(gtidsKey, gtidsValue)
if err != nil {
log.Log.Errorf("MetaStore SetBinlogProgress error,err:%s,key:%s", err.Error(), string(gtidsKey))
return err
}
err = b.Put(appliedIndexKey, appliedIndexValue)
if err != nil {
log.Log.Errorf("MetaStore SetBinlogProgress error,err:%s,key:%s", err.Error(), string(appliedIndexKey))
return err
}
return nil
})
}
//GetGtidSet get gtid set
func (s *MetaStore) GetGtidSet(flavor string, key string) (gomysql.GTIDSet, error) {
flavorKey := path.Join(flavor, key)
value, err := s.Get(utils.StringToBytes(flavorKey))
if err != nil {
return nil, err
}
if value == nil {
gitSet := new(gomysql.MysqlGTIDSet)
gitSet.Sets = make(map[string]*gomysql.UUIDSet)
return gitSet, nil
}
gtids, err := gomysql.DecodeMysqlGTIDSet(value)
if err != nil {
return nil, err
}
return gtids, nil
}
//SetPreviousGtidSet set previous gtid set
func (s *MetaStore) SetPreviousGtidSet(raftIndex uint64, previousGtidSet *gomysql.MysqlGTIDSet) error {
return s.DB.Update(func(tx *bolt.Tx) error {
var exist bool
keyPrefix := utils.StringToBytes(PgePrefix)
bucket := tx.Bucket(s.BucketName)
cursor := bucket.Cursor()
//Check if the previousGtidSet exists and if it does, do not set the value
for k, v := cursor.Seek(keyPrefix); k != nil && bytes.HasPrefix(k, keyPrefix); k, v = cursor.Next() {
gtids, err := gomysql.DecodeMysqlGTIDSet(v)
if err != nil {
return err
}
log.Log.Debugf("GetPreviousGtidSet:key is %s,value:%s,previous:%s",
string(k), gtids.String(), previousGtidSet.String())
if gtids.Equal(previousGtidSet) {
exist = true
break
}
}
if !exist {
raftIndexStr := fmt.Sprintf("%020d", raftIndex)
str := path.Join(PgePrefix, raftIndexStr)
key := utils.StringToBytes(str)
value := previousGtidSet.Encode()
err := bucket.Put(key, value)
if err != nil {
log.Log.Errorf("SetPreviousGtidSet:Put error,err:%s,key:%s", err.Error(), string(key))
return err
}
}
return nil
})
}
func (s *MetaStore) deletePreviousGtidSet(lastRaftIndex uint64) error {
return s.DB.Update(func(tx *bolt.Tx) error {
keyPrefix := utils.StringToBytes(PgePrefix)
bucket := tx.Bucket(s.BucketName)
cursor := bucket.Cursor()
for k, _ := cursor.Seek(keyPrefix); k != nil && bytes.HasPrefix(k, keyPrefix); k, _ = cursor.Next() {
keyStr := utils.BytesToString(k)
strArray := strings.Split(keyStr, "/")
if len(strArray) != 2 {
log.Log.Errorf("split string error,keyStr:%s", keyStr)
return ErrKeyNotFound
}
raftIndex, err := strconv.ParseUint(strArray[1], 10, 64)
if err != nil {
return ErrKeyNotFound
}
//delete PreviousGtidSet before lastRaftIndex
if raftIndex < lastRaftIndex {
err = cursor.Delete()
if err != nil {
return err
}
}
}
return nil
})
}
//GetPreviousGtidSet Iterate over all Previous Gtid keys in order, and read only
//the Previous_gtids_log_event, to find the last one, that is the
//subset of slaveExecutedGtids. Since every binary log file begins with
//a Previous_gtids_log_event, that contains all GTIDs in all
//previous binary logs.
//We also ask for the first GTID in the binary log to know if we
//should send the FD event with the "created" field cleared or not.
func (s *MetaStore) GetPreviousGtidSet(slaveExecutedGtids *gomysql.MysqlGTIDSet) (uint64, error) {
var raftIndex uint64
var lastGtids *gomysql.MysqlGTIDSet
var lastKey []byte
keyPrefix := utils.StringToBytes(PgePrefix)
err := s.DB.View(func(tx *bolt.Tx) error {
var txErr error
bucket := tx.Bucket(s.BucketName)
cursor := bucket.Cursor()
for k, v := cursor.Seek(keyPrefix); k != nil && bytes.HasPrefix(k, keyPrefix); k, v = cursor.Next() {
gtids, err := gomysql.DecodeMysqlGTIDSet(v)
if err != nil {
return err
}
log.Log.Debugf("GetPreviousGtidSet:key is %s,value:%s", string(k), gtids.String())
//return the first previous gtid set event
if len(slaveExecutedGtids.Sets) == 0 {
lastGtids = gtids
lastKey = k
break
}
//set lastGtids when slaveExecutedGtids contain gtids
if slaveExecutedGtids.Contain(gtids) {
lastGtids = gtids
lastKey = k
}
}
if lastGtids == nil {
log.Log.Errorf("GetPreviousGtidSet:lastGtids not be found,slaveExecutedGtids:%s",
slaveExecutedGtids.String())
return ErrNotContain
}
keyStr := utils.BytesToString(lastKey)
strArray := strings.Split(keyStr, "/")
if len(strArray) != 2 {
log.Log.Errorf("split string error,keyStr:%s", keyStr)
return ErrKeyNotFound
}
raftIndex, txErr = strconv.ParseUint(strArray[1], 10, 64)
if txErr != nil {
return ErrKeyNotFound
}
return nil
})
if err != nil {
return 0, err
}
log.Log.Debugf("GetPreviousGtidSet:raftIndex:%d,previousGtids:%s,slaveExecutedGtids:%s",
raftIndex, lastGtids.String(), slaveExecutedGtids.String())
return raftIndex, nil
}
//UpdatePugedGtidset update purged gtid when segment purged or updated by master gtid_purged
func (s *MetaStore) UpdatePugedGtidset(firstIndex uint64) error {
var gtids *gomysql.MysqlGTIDSet
var viewErr error
keyPrefix := utils.StringToBytes(PgePrefix)
err := s.DB.View(func(tx *bolt.Tx) error {
bucket := tx.Bucket(s.BucketName)
cursor := bucket.Cursor()
for k, v := cursor.Seek(keyPrefix); k != nil && bytes.HasPrefix(k, keyPrefix); k, v = cursor.Next() {
keyStr := utils.BytesToString(k)
strArray := strings.Split(keyStr, "/")
if len(strArray) != 2 {
log.Log.Errorf("split string error,keyStr:%s", keyStr)
return ErrKeyNotFound
}
raftIndex, err := strconv.ParseUint(strArray[1], 10, 64)
if err != nil {
return ErrKeyNotFound
}
//get the proximal previousGtidSet near firstIndex
//set this previousGtidSet into purgedGtidSet
if firstIndex < raftIndex {
gtids, viewErr = gomysql.DecodeMysqlGTIDSet(v)
if viewErr != nil {
return viewErr
}
return nil
}
}
return nil
})
if err != nil {
return err
}
if gtids == nil || len(gtids.String()) == 0 {
log.Log.Warningf("UpdatePugedGtidset:gtids is nil,raftIndex:%d", firstIndex)
return nil
}
gtidPurged, err := s.GetGtidSet(gomysql.MySQLFlavor, GtidPurgedKey)
if err != nil {
log.Log.Fatalf("UpdatePugedGtidset:get gtidPurged error,err:%s", err)
}
err = gtidPurged.Update(gtids.String())
if err != nil {
log.Log.Fatalf("UpdatePugedGtidset:get gtidPurged error,err:%s,gtids:%s", err, gtids.String())
}
err = s.SetGtidSet(gomysql.MySQLFlavor, GtidPurgedKey, gtidPurged)
if err != nil {
return err
}
err = s.deletePreviousGtidSet(firstIndex)
if err != nil {
return err
}
log.Log.Debugf("set purged gtid set,firstIndex:%d,purgedGtidSet:%s", firstIndex, gtidPurged.String())
return nil
}
//GetFde get FORMAT_DESCRIPTION_EVENT
func (s *MetaStore) GetFde(preGtidEventIndex uint64) ([]byte, error) {
var fde []byte
var viewErr error
var raftIndex uint64
keyPrefix := utils.StringToBytes(FdePrefix)
err := s.DB.View(func(tx *bolt.Tx) error {
bucket := tx.Bucket(s.BucketName)
cursor := bucket.Cursor()
//get the proximal fde near preGtidEventIndex
for k, v := cursor.Seek(keyPrefix); k != nil && bytes.HasPrefix(k, keyPrefix); k, v = cursor.Next() {
keyStr := utils.BytesToString(k)
strArray := strings.Split(keyStr, "/")
if len(strArray) != 2 {
log.Log.Errorf("split string error,keyStr:%s", keyStr)
return ErrKeyNotFound
}
raftIndex, viewErr = strconv.ParseUint(strArray[1], 10, 64)
if viewErr != nil {
return ErrKeyNotFound
}
if raftIndex < preGtidEventIndex {
fde = make([]byte, len(v))
copy(fde, v)
} else {
break
}
}
return nil
})
if err != nil {
return nil, err
}
if len(fde) == 0 {
log.Log.Errorf("GetFde:fde not be found,preGtidEventIndex:%d", preGtidEventIndex)
return nil, ErrNotContain
}
return fde, nil
}
//GetNextBinlogFile get the next binlog file name
func (s *MetaStore) GetNextBinlogFile(startRaftIndex uint64) (string, error) {
var fileName string
err := s.DB.View(func(tx *bolt.Tx) error {
var viewErr error
var raftIndex uint64
bucket := tx.Bucket(s.BucketName)
cursor := bucket.Cursor()
keyPrefix := utils.StringToBytes(NextBinlogPrefix)
for k, v := cursor.Seek(keyPrefix); k != nil && bytes.HasPrefix(k, keyPrefix); k, v = cursor.Next() {
keyStr := utils.BytesToString(k)
strArray := strings.Split(keyStr, "/")
if len(strArray) != 2 {
log.Log.Errorf("split string error,keyStr:%s", keyStr)
return ErrKeyNotFound
}
raftIndex, viewErr = strconv.ParseUint(strArray[1], 10, 64)
if viewErr != nil {
return ErrKeyNotFound
}
if raftIndex < startRaftIndex {
fileName = utils.BytesToString(v)
} else {
//if startRaftIndex little than first NextBinlogPrefix, we need generate the file name
if len(fileName) == 0 {
fileName = generatePreviousLogName(utils.BytesToString(v))
}
//find the last raftIndex little than startRaftIndex
break
}
}
return nil
})
if err != nil {
return "", err
}
if len(fileName) == 0 {
log.Log.Errorf("key in not found,startRaftIndex:%d", startRaftIndex)
return "", ErrKeyNotFound
}
log.Log.Debugf("GetNextBinlogFile:fileName:%s,startRaftIndex:%d", fileName, startRaftIndex)
return fileName, nil
}
func generatePreviousLogName(binlogFileName string) string {
strArray := strings.Split(binlogFileName, ".")
if len(strArray) != 2 {
log.Log.Fatalf("binlog file name illegal,binlogFileName:%s", binlogFileName)
}
num, err := strconv.ParseUint(strArray[1], 10, 64)
if err != nil {
log.Log.Fatalf("binlog file name illegal,binlogFileName:%s", binlogFileName)
}
return fmt.Sprintf("%s.%06d", strArray[0], num-1)
}
//Close2 close meta store
func (s *MetaStore) Close2() error {
return s.DB.Close()
}