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boltdb.go
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boltdb.go
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package persist
import (
"time"
"github.com/baidu/openedge/openedge-hub/utils"
bolt "github.com/etcd-io/bbolt"
)
// BoltDB use boltdb to persist data
type BoltDB struct {
*bolt.DB
bucket []byte
}
// NewBoltDB creates a bolt database
func NewBoltDB(path string) (*BoltDB, error) {
db, err := bolt.Open(path, 0600, &bolt.Options{Timeout: time.Second})
if err != nil {
return nil, err
}
return &BoltDB{DB: db, bucket: []byte(".self")}, nil
}
// Sequence returns the sequence id
func (p *BoltDB) Sequence() (sid uint64, err error) {
err = p.View(func(tx *bolt.Tx) error {
b := tx.Bucket(p.bucket)
if b != nil {
sid = b.Sequence()
}
return nil
})
return
}
// Put puts a KV
func (p *BoltDB) Put(key, value []byte) error {
return p.BucketPut(p.bucket, key, value)
}
// Get gets a KV by key
func (p *BoltDB) Get(key []byte) (value []byte, err error) {
return p.BucketGet(p.bucket, key)
}
// Fetch fetches a KV by offset
func (p *BoltDB) Fetch(offset []byte) (key, value []byte, err error) {
err = p.View(func(tx *bolt.Tx) error {
b := tx.Bucket(p.bucket)
if b == nil {
return nil
}
ik, iv := b.Cursor().Seek(offset)
if len(ik) == 0 || len(iv) == 0 {
return nil
}
key = make([]byte, len(ik))
value = make([]byte, len(iv))
copy(key, ik) // copy
copy(value, iv) // copy
return nil
})
return
}
// Delete deletes a KV
func (p *BoltDB) Delete(key []byte) error {
return p.BucketDelete(p.bucket, key)
}
// Clean cleans all KVs before timestamp
func (p *BoltDB) Clean(timestamp uint64) (count uint64, err error) {
err = p.Update(func(tx *bolt.Tx) error {
b := tx.Bucket(p.bucket)
if b == nil {
return nil
}
c := b.Cursor()
for k, _ := c.First(); k != nil && utils.U64(k[8:]) < timestamp; k, _ = c.Next() {
err = b.Delete(k)
if err != nil {
return err
}
count++
}
return nil
})
return
}
// BatchPut puts KVs in batch mode
func (p *BoltDB) BatchPut(kvs []*KV) error {
return p.Update(func(tx *bolt.Tx) error {
b, err := tx.CreateBucketIfNotExists(p.bucket)
if err != nil {
return err
}
for _, kv := range kvs {
err = b.Put(kv.Key, kv.Value)
if err != nil {
return err
}
}
return nil
})
}
// BatchPutV puts values in batch mode
func (p *BoltDB) BatchPutV(vs [][]byte) error {
return p.Update(func(tx *bolt.Tx) error {
b, err := tx.CreateBucketIfNotExists(p.bucket)
if err != nil {
return err
}
// key = sid + ts (16 bytes)
ts := uint64(time.Now().Unix())
for _, v := range vs {
sid, err := b.NextSequence()
if err != nil {
return err
}
err = b.Put(utils.U64U64ToB(sid, ts), v)
if err != nil {
return err
}
}
return nil
})
}
// BucketPut puts a KV into bucket
func (p *BoltDB) BucketPut(bucket, key, value []byte) error {
return p.Update(func(tx *bolt.Tx) error {
b, err := tx.CreateBucketIfNotExists(bucket)
if err != nil {
return err
}
return b.Put(key, value)
})
}
// BucketGet gets a KV from bucket by key
func (p *BoltDB) BucketGet(bucket, key []byte) (value []byte, err error) {
err = p.View(func(tx *bolt.Tx) error {
b := tx.Bucket(bucket)
if b == nil {
return nil
}
iv := b.Get(key)
if len(iv) == 0 {
return nil
}
value = make([]byte, len(iv))
copy(value, iv) // copy
return nil
})
return
}
// BatchFetch fetches KVs by offset in batch mode
func (p *BoltDB) BatchFetch(offset []byte, size int) ([]*KV, error) {
res := make([]*KV, 0)
err := p.View(func(tx *bolt.Tx) error {
b := tx.Bucket(p.bucket)
if b == nil {
return nil
}
i := int(0)
c := b.Cursor()
for ik, iv := c.Seek(offset); i < size && len(ik) != 0 && len(iv) != 0; ik, iv = c.Next() {
key := make([]byte, len(ik))
value := make([]byte, len(iv))
copy(key, ik) // copy
copy(value, iv) // copy
res = append(res, &KV{Key: key, Value: value})
i++
}
return nil
})
return res, err
}
// BucketDelete deletes a KV in bucket by key
func (p *BoltDB) BucketDelete(bucket, key []byte) error {
return p.Update(func(tx *bolt.Tx) error {
b := tx.Bucket(bucket)
if b == nil {
return nil
}
return b.Delete(key)
})
}
// BucketList lists all KVs in bucket
func (p *BoltDB) BucketList(bucket []byte) (map[string][]byte, error) {
res := make(map[string][]byte)
err := p.View(func(tx *bolt.Tx) error {
b := tx.Bucket(bucket)
if b == nil {
return nil
}
return b.ForEach(func(ik, iv []byte) error {
v := make([]byte, len(iv))
copy(v, iv) // copy
res[string(ik)] = v
return nil
})
})
return res, err
}
// Close closes database
func (p *BoltDB) Close() {
p.DB.Close()
}