/
go_pegasus.go
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/
go_pegasus.go
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// Copyright Fuzamei Corp. 2018 All Rights Reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package db
import (
"bytes"
"context"
"strings"
"time"
log "github.com/33cn/chain33/common/log/log15"
"github.com/33cn/chain33/types"
"github.com/XiaoMi/pegasus-go-client/pegasus"
"github.com/syndtr/goleveldb/leveldb/util"
)
var slog = log.New("module", "db.pegasus")
var pdbBench = &SsdbBench{}
//HashKeyLen hash长度
var HashKeyLen = 24
func init() {
dbCreator := func(name string, dir string, cache int) (DB, error) {
return NewPegasusDB(name, dir, cache)
}
registerDBCreator(goPegasusDbBackendStr, dbCreator, false)
}
//PegasusDB db
type PegasusDB struct {
BaseDB
cfg *pegasus.Config
name string
client pegasus.Client
table pegasus.TableConnector
}
func printPegasusBenchmark() {
tick := time.Tick(time.Minute * 5)
for {
<-tick
slog.Info(pdbBench.String())
}
}
//NewPegasusDB new
func NewPegasusDB(name string, dir string, cache int) (*PegasusDB, error) {
database := &PegasusDB{name: name}
database.cfg = parsePegasusNodes(dir)
if database.cfg == nil {
slog.Error("no valid instance exists, exit!")
return nil, types.ErrDataBaseDamage
}
var err error
database.client = pegasus.NewClient(*database.cfg)
tb, err := database.client.OpenTable(context.Background(), database.name)
if err != nil {
slog.Error("connect to pegasus error!", "pegasus", database.cfg, "error", err)
err = database.client.Close()
if err != nil {
slog.Error("database.client", "close err", err)
}
return nil, types.ErrDataBaseDamage
}
database.table = tb
go printPegasusBenchmark()
return database, nil
}
// url pattern: ip:port,ip:port
func parsePegasusNodes(url string) *pegasus.Config {
hosts := strings.Split(url, ",")
if hosts == nil {
slog.Error("invalid url")
return nil
}
cfg := &pegasus.Config{MetaServers: hosts}
return cfg
}
//Get get
func (db *PegasusDB) Get(key []byte) ([]byte, error) {
start := time.Now()
hashKey := getHashKey(key)
value, err := db.table.Get(context.Background(), hashKey, key)
if err != nil {
//slog.Error("Get value error", "error", err, "key", key, "keyhex", hex.EncodeToString(key), "keystr", string(key))
return nil, err
}
if value == nil {
return nil, ErrNotFoundInDb
}
pdbBench.read(1, time.Since(start))
return value, nil
}
//Set set
func (db *PegasusDB) Set(key []byte, value []byte) error {
start := time.Now()
hashKey := getHashKey(key)
err := db.table.Set(context.Background(), hashKey, key, value)
if err != nil {
slog.Error("Set", "error", err)
return err
}
pdbBench.write(1, time.Since(start))
return nil
}
//SetSync 设置同步
func (db *PegasusDB) SetSync(key []byte, value []byte) error {
return db.Set(key, value)
}
//Delete 删除
func (db *PegasusDB) Delete(key []byte) error {
start := time.Now()
defer pdbBench.write(1, time.Since(start))
hashKey := getHashKey(key)
err := db.table.Del(context.Background(), hashKey, key)
if err != nil {
slog.Error("Delete", "error", err)
return err
}
return nil
}
//DeleteSync 删除同步
func (db *PegasusDB) DeleteSync(key []byte) error {
return db.Delete(key)
}
//Close 同步
func (db *PegasusDB) Close() {
err := db.table.Close()
if err != nil {
llog.Error("Close", "db table error", err)
}
err = db.client.Close()
if err != nil {
llog.Error("Close", "client error", err)
}
}
//Print 打印
func (db *PegasusDB) Print() {
}
//Stats ...
func (db *PegasusDB) Stats() map[string]string {
return nil
}
//Iterator 迭代器
func (db *PegasusDB) Iterator(begin []byte, end []byte, reverse bool) Iterator {
var (
err error
vals []*pegasus.KeyValue
start []byte
over []byte
)
if end == nil {
end = bytesPrefix(begin)
}
if bytes.Equal(end, types.EmptyValue) {
end = nil
}
limit := util.Range{Start: begin, Limit: end}
hashKey := getHashKey(begin)
if reverse {
start = begin
over = limit.Limit
} else {
start = limit.Limit
over = begin
}
dbit := &PegasusIt{itBase: itBase{begin, end, reverse}, index: -1, table: db.table, itbegin: start, itend: over}
opts := &pegasus.MultiGetOptions{StartInclusive: false, StopInclusive: false, MaxFetchCount: IteratorPageSize, Reverse: dbit.reverse}
vals, _, err = db.table.MultiGetRangeOpt(context.Background(), hashKey, begin, limit.Limit, opts)
if err != nil {
slog.Error("create iterator error!")
return nil
}
if len(vals) > 0 {
dbit.vals = vals
// 如果返回的数据大小刚好满足分页,则假设下一页还有数据
if len(dbit.vals) == IteratorPageSize {
dbit.nextPage = true
// 下一页数据的开始,等于本页数据的结束,不过在下次查询时需要设置StartInclusiv=false,因为本条数据已经包含
dbit.tmpEnd = dbit.vals[IteratorPageSize-1].SortKey
}
}
return dbit
}
//PegasusIt ...
type PegasusIt struct {
itBase
table pegasus.TableConnector
vals []*pegasus.KeyValue
index int
nextPage bool
tmpEnd []byte
// 迭代开始位置
itbegin []byte
// 迭代结束位置
itend []byte
// 当前所属的页数(从0开始)
pageNo int
}
//Close 关闭
func (dbit *PegasusIt) Close() {
dbit.index = -1
}
//Next next
func (dbit *PegasusIt) Next() bool {
if len(dbit.vals) > dbit.index+1 {
dbit.index++
return true
}
// 如果有下一页数据,则自动抓取
if dbit.nextPage {
return dbit.cacheNextPage(dbit.tmpEnd)
}
return false
}
func (dbit *PegasusIt) initPage(begin, end []byte) bool {
var (
vals []*pegasus.KeyValue
err error
)
opts := &pegasus.MultiGetOptions{StartInclusive: false, StopInclusive: false, MaxFetchCount: IteratorPageSize, Reverse: dbit.reverse}
hashKey := getHashKey(begin)
vals, _, err = dbit.table.MultiGetRangeOpt(context.Background(), hashKey, begin, end, opts)
if err != nil {
slog.Error("get iterator next page error", "error", err, "begin", begin, "end", dbit.itend, "reverse", dbit.reverse)
return false
}
if len(vals) > 0 {
// 这里只改变keys,不改变index
dbit.vals = vals
// 如果返回的数据大小刚好满足分页,则假设下一页还有数据
if len(vals) == IteratorPageSize {
dbit.nextPage = true
dbit.tmpEnd = dbit.vals[IteratorPageSize-1].SortKey
} else {
dbit.nextPage = false
}
return true
}
return false
}
// 获取下一页的数据
func (dbit *PegasusIt) cacheNextPage(flag []byte) bool {
var (
over []byte
)
// 如果是逆序,则取从开始到flag的数据
if dbit.reverse {
over = dbit.itbegin
} else {
over = dbit.itend
}
// 如果是正序,则取从flag到结束的数据
if dbit.initPage(flag, over) {
dbit.index = 0
dbit.pageNo++
return true
}
return false
}
func (dbit *PegasusIt) checkKeyCmp(key1, key2 []byte, reverse bool) bool {
if reverse {
return bytes.Compare(key1, key2) < 0
}
return bytes.Compare(key1, key2) > 0
}
func (dbit *PegasusIt) findInPage(key []byte) int {
pos := -1
for i, v := range dbit.vals {
if i < dbit.index {
continue
}
if dbit.checkKeyCmp(key, v.SortKey, dbit.reverse) {
continue
} else {
pos = i
break
}
}
return pos
}
//Seek 查找
func (dbit *PegasusIt) Seek(key []byte) bool {
pos := dbit.findInPage(key)
// 如果第一页已经找到,不会走入此逻辑
for pos == -1 && dbit.nextPage {
if dbit.cacheNextPage(dbit.tmpEnd) {
pos = dbit.findInPage(key)
} else {
break
}
}
dbit.index = pos
return dbit.Valid()
}
//Rewind 从头开始
func (dbit *PegasusIt) Rewind() bool {
// 目前代码的Rewind调用都是在第一页,正常情况下走不到else分支;
// 但为了代码健壮性考虑,这里增加对else分支的处理
if dbit.pageNo == 0 {
dbit.index = 0
return true
}
// 当数据取到第N页的情况时,Rewind需要返回到第一页第一条
if dbit.initPage(dbit.itbegin, dbit.itend) {
dbit.index = 0
dbit.pageNo = 0
return true
}
return false
}
//Key key
func (dbit *PegasusIt) Key() []byte {
if dbit.index >= 0 && dbit.index < len(dbit.vals) {
return dbit.vals[dbit.index].SortKey
}
return nil
}
//Value value
func (dbit *PegasusIt) Value() []byte {
if dbit.index >= len(dbit.vals) {
slog.Error("get iterator value error: index out of bounds")
return nil
}
return dbit.vals[dbit.index].Value
}
func (dbit *PegasusIt) Error() error {
return nil
}
//ValueCopy 复制
func (dbit *PegasusIt) ValueCopy() []byte {
v := dbit.Value()
value := make([]byte, len(v))
copy(value, v)
return value
}
//Valid 合法性
func (dbit *PegasusIt) Valid() bool {
start := time.Now()
if dbit.index < 0 {
return false
}
if len(dbit.vals) <= dbit.index {
return false
}
key := dbit.vals[dbit.index].SortKey
pdbBench.read(1, time.Since(start))
return dbit.checkKey(key)
}
//PegasusBatch batch
type PegasusBatch struct {
table pegasus.TableConnector
batchset map[string][]byte
batchdel map[string][]byte
size int
}
//NewBatch new
func (db *PegasusDB) NewBatch(sync bool) Batch {
return &PegasusBatch{table: db.table, batchset: make(map[string][]byte), batchdel: make(map[string][]byte)}
}
//Set set
func (db *PegasusBatch) Set(key, value []byte) {
db.batchset[string(key)] = value
delete(db.batchdel, string(key))
db.size += len(value)
db.size += len(key)
}
//Delete 删除
func (db *PegasusBatch) Delete(key []byte) {
db.batchset[string(key)] = []byte("")
delete(db.batchset, string(key))
db.batchdel[string(key)] = key
db.size += len(key)
}
// 注意本方法的实现逻辑,因为ssdb没有提供删除和更新同时进行的批量操作;
// 所以这里先执行更新操作(删除的KEY在这里会将VALUE设置为空);
// 然后再执行删除操作;
// 这样即使中间执行出错,也不会导致删除结果未写入的情况(值已经被置空);
func (db *PegasusBatch) Write() error {
start := time.Now()
// 这里其实也需要对hashKey进行分别计算,然后分组查询,最后汇总结果
if len(db.batchset) > 0 {
var (
keysMap map[string][][]byte
valsMap map[string][][]byte
hashKey []byte
byteKey []byte
keys [][]byte
values [][]byte
)
keysMap = make(map[string][][]byte)
valsMap = make(map[string][][]byte)
// 首先,使用hashKey进行数据分组
for k, v := range db.batchset {
byteKey = []byte(k)
hashKey = getHashKey(byteKey)
if value, ok := keysMap[string(hashKey)]; ok {
keysMap[string(hashKey)] = append(value, byteKey)
valsMap[string(hashKey)] = append(valsMap[string(hashKey)], v)
} else {
keysMap[string(hashKey)] = [][]byte{byteKey}
valsMap[string(hashKey)] = [][]byte{v}
}
}
// 然后,再分别提交修改
for k, v := range keysMap {
keys = v
values = valsMap[k]
err := db.table.MultiSet(context.Background(), []byte(k), keys, values)
if err != nil {
slog.Error("Write (multi_set)", "error", err)
return err
}
}
}
if len(db.batchdel) > 0 {
var (
keysMap map[string][][]byte
hashKey []byte
byteKey []byte
)
keysMap = make(map[string][][]byte)
// 首先,使用hashKey进行数据分组
for k := range db.batchdel {
byteKey = []byte(k)
hashKey = getHashKey(byteKey)
if value, ok := keysMap[string(hashKey)]; ok {
keysMap[string(hashKey)] = append(value, byteKey)
} else {
keysMap[string(hashKey)] = [][]byte{byteKey}
}
}
// 然后,再分别提交删除
for k, v := range keysMap {
err := db.table.MultiDel(context.Background(), []byte(k), v)
if err != nil {
slog.Error("Write (multi_del)", "error", err)
return err
}
}
}
pdbBench.write(len(db.batchset)+len(db.batchdel), time.Since(start))
return nil
}
//ValueSize value批长度
func (db *PegasusBatch) ValueSize() int {
return db.size
}
//ValueLen batch数量
func (db *PegasusBatch) ValueLen() int {
return len(db.batchset)
}
//Reset 重置
func (db *PegasusBatch) Reset() {
db.batchset = make(map[string][]byte)
db.batchdel = make(map[string][]byte)
db.size = 0
}
// UpdateWriteSync ...
func (db *PegasusBatch) UpdateWriteSync(sync bool) {
}
func getHashKey(key []byte) []byte {
if len(key) <= HashKeyLen {
return key
}
return key[:HashKeyLen]
}