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storage_badger.go
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storage_badger.go
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package storage
import (
"time"
"github.com/dgraph-io/badger"
"github.com/xyzj/garagemq/interfaces"
)
// Badger implements wrapper for badger database
type Badger struct {
db *badger.DB
}
// NewBadger returns new instance of badger wrapper
func NewBadger(storageDir string) *Badger {
storage := &Badger{}
opts := badger.DefaultOptions(storageDir)
opts.SyncWrites = true
opts.Dir = storageDir
opts.ValueDir = storageDir
var err error
storage.db, err = badger.Open(opts)
if err != nil {
panic(err)
}
go storage.runStorageGC()
return storage
}
// ProcessBatch process batch of operations
func (storage *Badger) ProcessBatch(batch []*interfaces.Operation) (err error) {
return storage.db.Update(func(txn *badger.Txn) error {
for _, op := range batch {
if op.Op == interfaces.OpSet {
if err = txn.Set([]byte(op.Key), op.Value); err != nil {
return err
}
}
if op.Op == interfaces.OpDel {
if err = txn.Delete([]byte(op.Key)); err != nil {
return err
}
}
}
return nil
})
}
// Close properly closes badger database
func (storage *Badger) Close() error {
return storage.db.Close()
}
// Set adds a key-value pair to the database
func (storage *Badger) Set(key string, value []byte) (err error) {
return storage.db.Update(func(txn *badger.Txn) error {
err := txn.Set([]byte(key), value)
return err
})
}
// Del deletes a key
func (storage *Badger) Del(key string) (err error) {
return storage.db.Update(func(txn *badger.Txn) error {
err := txn.Delete([]byte(key))
return err
})
}
// Get returns value by key
func (storage *Badger) Get(key string) (value []byte, err error) {
err = storage.db.View(func(txn *badger.Txn) error {
item, err := txn.Get([]byte(key))
if err != nil {
return err
}
value, err = item.ValueCopy(value)
if err != nil {
return err
}
return nil
})
return
}
// Iterate iterates over all keys
func (storage *Badger) Iterate(fn func(key []byte, value []byte)) {
storage.db.View(func(txn *badger.Txn) error {
opts := badger.DefaultIteratorOptions
opts.AllVersions = false
it := txn.NewIterator(opts)
defer it.Close()
for it.Rewind(); it.Valid(); it.Next() {
item := it.Item()
k := item.KeyCopy(nil)
v, err := item.ValueCopy(nil)
if err != nil {
return err
}
fn(k, v)
}
return nil
})
}
// Iterate iterates over keys with prefix
func (storage *Badger) IterateByPrefix(prefix []byte, limit uint64, fn func(key []byte, value []byte)) uint64 {
var totalIterated uint64
storage.db.View(func(txn *badger.Txn) error {
opts := badger.DefaultIteratorOptions
opts.AllVersions = false
it := txn.NewIterator(opts)
defer it.Close()
for it.Seek(prefix); it.ValidForPrefix(prefix) && ((limit > 0 && totalIterated < limit) || limit <= 0); it.Next() {
item := it.Item()
k := item.KeyCopy(nil)
v, err := item.ValueCopy(nil)
if err != nil {
return err
}
fn(k, v)
totalIterated++
}
return nil
})
return totalIterated
}
func (storage *Badger) KeysByPrefixCount(prefix []byte) uint64 {
var count uint64
storage.db.View(func(txn *badger.Txn) error {
opts := badger.DefaultIteratorOptions
opts.AllVersions = false
opts.PrefetchValues = false
it := txn.NewIterator(opts)
defer it.Close()
for it.Seek(prefix); it.ValidForPrefix(prefix); it.Next() {
count++
}
return nil
})
return count
}
// Iterate iterates over keys with prefix
func (storage *Badger) DeleteByPrefix(prefix []byte) {
deleteKeys := func(keysForDelete [][]byte) error {
if err := storage.db.Update(func(txn *badger.Txn) error {
for _, key := range keysForDelete {
if err := txn.Delete(key); err != nil {
return err
}
}
return nil
}); err != nil {
return err
}
return nil
}
collectSize := 100000
keysForDeleteBunches := make([][][]byte, 0)
keysForDelete := make([][]byte, 0, collectSize)
keysCollected := 0
// создать банчи и удалять банчами после итератора же ну
storage.db.View(func(txn *badger.Txn) error {
opts := badger.DefaultIteratorOptions
opts.AllVersions = false
opts.PrefetchValues = false
it := txn.NewIterator(opts)
defer it.Close()
for it.Seek(prefix); it.ValidForPrefix(prefix); it.Next() {
key := it.Item().KeyCopy(nil)
keysForDelete = append(keysForDelete, key)
keysCollected++
if keysCollected == collectSize {
keysForDeleteBunches = append(keysForDeleteBunches, keysForDelete)
keysForDelete = make([][]byte, 0, collectSize)
keysCollected = 0
}
}
if keysCollected > 0 {
keysForDeleteBunches = append(keysForDeleteBunches, keysForDelete)
}
return nil
})
for _, keys := range keysForDeleteBunches {
deleteKeys(keys)
}
}
// Iterate iterates over keys with prefix
func (storage *Badger) IterateByPrefixFrom(prefix []byte, from []byte, limit uint64, fn func(key []byte, value []byte)) uint64 {
var totalIterated uint64
storage.db.View(func(txn *badger.Txn) error {
opts := badger.DefaultIteratorOptions
opts.AllVersions = false
it := txn.NewIterator(opts)
defer it.Close()
for it.Seek(from); it.ValidForPrefix(prefix) && ((limit > 0 && totalIterated < limit) || limit <= 0); it.Next() {
item := it.Item()
k := item.KeyCopy(nil)
v, err := item.ValueCopy(nil)
if err != nil {
return err
}
fn(k, v)
totalIterated++
}
return nil
})
return totalIterated
}
func (storage *Badger) runStorageGC() {
timer := time.NewTicker(10 * time.Minute)
for {
select {
case <-timer.C:
storage.storageGC()
}
}
}
func (storage *Badger) storageGC() {
again:
err := storage.db.RunValueLogGC(0.5)
if err == nil {
goto again
}
}