/
badgerstore.go
168 lines (152 loc) · 3.56 KB
/
badgerstore.go
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package raftbadger
import (
"errors"
"fmt"
"github.com/dgraph-io/badger"
"github.com/hashicorp/raft"
)
var (
ErrKeyNotFound = errors.New("not found")
)
type LogStableStore interface {
raft.LogStore
raft.StableStore
}
type BadgerStore struct {
db *badger.DB
}
func New(opt badger.Options) (*BadgerStore, error) {
db, err := badger.Open(opt)
if err != nil {
return nil, err
}
s := &BadgerStore{
db: db,
}
return s, nil
}
func (s *BadgerStore) Close() error { return s.db.Close() }
func (s *BadgerStore) FirstIndex() (uint64, error) { return s.firstIndex(false) }
func (s *BadgerStore) LastIndex() (uint64, error) { return s.firstIndex(true) }
func (s *BadgerStore) GetLog(idx uint64, log *raft.Log) error {
var item *badger.Item
err := s.db.View(func(txn *badger.Txn) error {
var err error
item, err = txn.Get(prefixKey(uint64ToBytes(idx), "logs"))
if err != nil {
return err
}
return nil
})
if err != nil {
if err == badger.ErrKeyNotFound {
return raft.ErrLogNotFound
}
return err
}
v, err := item.Value()
if err != nil {
return err
}
return decodeMsgPack(v, log)
}
func (s *BadgerStore) StoreLog(log *raft.Log) error {
buf, err := encodeMsgPack(log)
if err != nil {
return err
}
return s.db.Update(func(txn *badger.Txn) error {
return txn.Set(prefixKey(uint64ToBytes(log.Index), "logs"), buf.Bytes(), 0)
})
}
func (s *BadgerStore) StoreLogs(logs []*raft.Log) error {
txn := s.db.NewTransaction(true)
for _, log := range logs {
buf, err := encodeMsgPack(log)
if err != nil {
return err
}
txn.Set(prefixKey(uint64ToBytes(log.Index), "logs"), buf.Bytes(), 0)
}
return txn.Commit(nil)
}
func (s *BadgerStore) DeleteRange(min, max uint64) error {
dTxn := s.db.NewTransaction(true)
err := s.db.View(func(txn *badger.Txn) error {
opts := badger.DefaultIteratorOptions
opts.PrefetchSize = 100
it := txn.NewIterator(opts)
for it.Seek(uint64ToBytes(min)); it.Valid(); it.Next() {
item := it.Item()
key := item.Key()
if bytesToUint64(key) > max {
break
}
dTxn.Delete(prefixKey(key, "logs"))
}
return nil
})
if err != nil {
return err
}
return dTxn.Commit(nil)
}
func (s *BadgerStore) Get(k []byte) ([]byte, error) {
var item *badger.Item
err := s.db.View(func(txn *badger.Txn) error {
var err error
item, err = txn.Get(prefixKey(k, "conf"))
if err != nil {
return err
}
return nil
})
if err != nil {
if err == badger.ErrKeyNotFound {
return nil, ErrKeyNotFound
}
return nil, err
}
return item.Value()
}
func (s *BadgerStore) Set(k, v []byte) error {
return s.db.Update(func(txn *badger.Txn) error {
return txn.Set(prefixKey(k, "conf"), v, 0)
})
}
func (s *BadgerStore) GetUint64(key []byte) (uint64, error) {
val, err := s.Get(key)
if err != nil {
return 0, err
}
return bytesToUint64(val), nil
}
func (s *BadgerStore) SetUint64(key []byte, val uint64) error {
return s.db.Update(func(txn *badger.Txn) error {
return txn.Set(key, uint64ToBytes(val), 0)
})
}
func (s *BadgerStore) firstIndex(reverse bool) (uint64, error) {
var item *badger.Item
err := s.db.View(func(txn *badger.Txn) error {
it := txn.NewIterator(badger.IteratorOptions{
PrefetchSize: 1,
PrefetchValues: false,
Reverse: reverse,
})
prefix := []byte("logs")
for it.Seek(prefix); it.ValidForPrefix(prefix); it.Next() {
item = it.Item()
fmt.Printf("firstindex - item = %+v\n", item)
return nil
}
return badger.ErrKeyNotFound
})
if err != nil {
if err == badger.ErrKeyNotFound {
return 0, nil
}
return 0, err
}
return bytesToUint64(item.Key()), nil
}