/
provider.go
executable file
·199 lines (157 loc) · 3.5 KB
/
provider.go
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package badgerdb
import (
"time"
"github.com/alash3al/goukv"
"github.com/dgraph-io/badger/v2"
"github.com/dgraph-io/badger/v2/options"
)
// Provider represents a provider
type Provider struct {
db *badger.DB
}
// Open implements goukv.Open
func (p Provider) Open(dsn *goukv.DSN) (goukv.Provider, error) {
path := dsn.Hostname() + dsn.Path()
syncWrites := dsn.GetBool("sync_writes")
badgerOpts := badger.DefaultOptions(path)
badgerOpts.WithSyncWrites(syncWrites)
badgerOpts.WithLogger(nil)
badgerOpts.WithKeepL0InMemory(true)
badgerOpts.WithCompression(options.Snappy)
db, err := badger.Open(badgerOpts)
if err != nil {
return nil, err
}
go (func() {
ticker := time.NewTicker(5 * time.Minute)
defer ticker.Stop()
for range ticker.C {
for {
err := db.RunValueLogGC(0.5)
if err != nil {
break
}
}
}
})()
return &Provider{
db: db,
}, nil
}
// Put implements goukv.Put
func (p Provider) Put(entry *goukv.Entry) error {
return p.db.Update(func(txn *badger.Txn) error {
if entry.TTL > 0 {
badgerEntry := badger.NewEntry(entry.Key, entry.Value)
badgerEntry.WithTTL(entry.TTL)
return txn.SetEntry(badgerEntry)
}
return txn.Set(entry.Key, entry.Value)
})
}
// Batch perform multi put operation, empty value means *delete*
func (p Provider) Batch(entries []*goukv.Entry) error {
batch := p.db.NewWriteBatch()
defer batch.Cancel()
for _, entry := range entries {
var err error
if entry.Value == nil {
err = batch.Delete(entry.Key)
} else {
if entry.TTL > 0 {
badgerEntry := badger.NewEntry(entry.Key, entry.Value)
badgerEntry.WithTTL(entry.TTL)
err = batch.SetEntry(badgerEntry)
} else {
err = batch.Set(entry.Key, entry.Value)
}
}
if err != nil {
batch.Cancel()
return err
}
}
return batch.Flush()
}
// Get implements goukv.Get
func (p Provider) Get(k []byte) ([]byte, error) {
var data []byte
err := p.db.View(func(txn *badger.Txn) error {
item, err := txn.Get(k)
if err == badger.ErrKeyNotFound {
return goukv.ErrKeyNotFound
}
if err != nil {
return err
}
d, err := item.ValueCopy(nil)
if err != nil {
return err
}
data = d
return err
})
return data, err
}
// TTL implements goukv.TTL
func (p Provider) TTL(k []byte) (*time.Time, error) {
var t *time.Time
err := p.db.View(func(txn *badger.Txn) error {
item, err := txn.Get(k)
if err == badger.ErrKeyNotFound {
return goukv.ErrKeyNotFound
}
if err != nil {
return err
}
expiresAt := item.ExpiresAt()
if expiresAt > 0 {
toUnix := time.Unix(int64(expiresAt), 0)
t = &toUnix
}
return err
})
return t, err
}
// Delete implements goukv.Delete
func (p Provider) Delete(k []byte) error {
return p.db.Update(func(txn *badger.Txn) error {
return txn.Delete(k)
})
}
// Close implements goukv.Close
func (p Provider) Close() error {
return p.db.Close()
}
// Scan implements goukv.Scan
func (p Provider) Scan(opts goukv.ScanOpts) error {
if opts.Scanner == nil {
return nil
}
txn := p.db.NewTransaction(false)
defer txn.Commit()
iterOpts := badger.DefaultIteratorOptions
iterOpts.Reverse = opts.ReverseScan
if len(opts.Prefix) > 0 {
iterOpts.Prefix = opts.Prefix
}
iter := txn.NewIterator(iterOpts)
defer iter.Close()
if opts.Offset != nil {
iter.Seek(opts.Offset)
} else {
iter.Rewind()
}
for ; iter.Valid(); iter.Next() {
item := iter.Item()
key := item.KeyCopy(nil)
val, err := item.ValueCopy(nil)
if err != nil {
break
}
if !opts.Scanner(key, val) {
break
}
}
return nil
}