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bucket.go
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bucket.go
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package badger
import (
"context"
"github.com/dgraph-io/badger/v3"
"github.com/dgraph-io/badger/v3/pb"
"github.com/dgraph-io/ristretto/z"
"log"
"runtime"
"sync/atomic"
)
type Bucket struct {
name string
prefix string
stor *Store
}
func CreateBucket(name string, stor *Store) *Bucket {
return &Bucket{
name: name,
prefix: name + ":",
stor: stor,
}
}
func (s *Bucket) Set(k, v []byte) error {
k = []byte(s.prefix + string(k))
return s.stor.Set(k, v)
}
func (s *Bucket) SetWithTTL(k, v []byte, expireAt int64) error {
k = []byte(s.prefix + string(k))
return s.stor.SetWithTTL(k, v, expireAt)
}
//BatchSet 多个写操作使用一个事务
func (s *Bucket) BatchSet(keys, values [][]byte) error {
for i := 0; i < len(keys); i++ {
k := keys[i]
k = []byte(s.prefix + string(k))
keys[i] = k
}
return s.stor.BatchSet(keys, values)
}
//BatchSet 多个写操作使用一个事务
func (s *Bucket) BatchSetWithTTL(keys, values [][]byte, expireAts []int64) error {
for i := 0; i < len(keys); i++ {
k := keys[i]
k = []byte(s.prefix + string(k))
keys[i] = k
}
return s.stor.BatchSetWithTTL(keys, values, expireAts)
}
//Get 如果key不存在会返回error:Key not found
func (s *Bucket) Get(k []byte) ([]byte, error) {
k = []byte(s.prefix + string(k))
return s.stor.Get(k)
}
//BatchGet 返回的values与传入的keys顺序保持一致。如果key不存在或读取失败则对应的value是空数组
func (s *Bucket) BatchGet(keys [][]byte) ([][]byte, error) {
for i := 0; i < len(keys); i++ {
k := keys[i]
k = []byte(s.prefix + string(k))
keys[i] = k
}
return s.stor.BatchGet(keys)
}
//Delete
func (s *Bucket) Delete(k []byte) error {
k = []byte(s.prefix + string(k))
return s.stor.Delete(k)
}
//BatchDelete
func (s *Bucket) BatchDelete(keys [][]byte) error {
for i := 0; i < len(keys); i++ {
k := keys[i]
k = []byte(s.prefix + string(k))
keys[i] = k
}
return s.stor.BatchDelete(keys)
}
//Has 判断某个key是否存在
func (s *Bucket) Has(k []byte) bool {
k = []byte(s.prefix + string(k))
return s.stor.Has(k)
}
//IterDB 遍历整个DB
func (s *Bucket) Iter(fn func(k, v []byte) error) int64 {
return s.stor.IterByPrefix(s.prefix, fn)
}
//IterKey 只遍历key。key是全部存在LSM tree上的,只需要读内存,所以很快
func (s *Bucket) IterKeys(fn func(k []byte) error) int64 {
return s.stor.IterKeysByPrefix(s.prefix, fn)
}
func (s *Bucket) Stream(fn func(k []byte, v []byte) error) int64 {
var total int64
stream := s.stor.db.NewStream()
// -- Optional settings
stream.NumGo = runtime.NumCPU() * 2 // Set number of goroutines to use for iteration.
stream.Prefix = []byte(s.prefix) // Leave nil for iteration over the whole DB.
stream.LogPrefix = "Badger.Streaming" // For identifying stream logs. Outputs to Logger.
stream.KeyToList = func(key []byte, itr *badger.Iterator) (*pb.KVList, error) {
item := itr.Item()
val, err := item.ValueCopy(nil)
if err != nil {
return nil, err
}
err = fn(key, val)
if err != nil {
return nil, err
}
atomic.AddInt64(&total, 1)
return stream.ToList(key, itr)
}
stream.Send = func(buf *z.Buffer) error {
return nil
}
// Run the stream
if err := stream.Orchestrate(context.Background()); err != nil {
log.Panic(err)
}
// Done.
return atomic.LoadInt64(&total)
}
func (s *Bucket) Chan(ch chan<- interface{}) int64 {
var total int64
stream := s.stor.db.NewStream()
// -- Optional settings
stream.NumGo = runtime.NumCPU() * 2 // Set number of goroutines to use for iteration.
stream.Prefix = []byte(s.prefix) // Leave nil for iteration over the whole DB.
stream.LogPrefix = "Badger.Streaming" // For identifying stream logs. Outputs to Logger.
stream.KeyToList = func(key []byte, itr *badger.Iterator) (*pb.KVList, error) {
item := itr.Item()
val, err := item.ValueCopy(nil)
if err != nil {
return nil, err
}
// send value to channel
ch <- val
atomic.AddInt64(&total, 1)
return stream.ToList(key, itr)
}
stream.Send = func(buf *z.Buffer) error {
return nil
}
// Run the stream
if err := stream.Orchestrate(context.Background()); err != nil {
log.Panic(err)
}
// Done.
return atomic.LoadInt64(&total)
}