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package models
import (
"github.com/dgraph-io/badger/v3"
"go.uber.org/zap"
)
type Persister struct {
log *zap.SugaredLogger
db *badger.DB
}
type PersisterResult struct {
Value []byte
Key []byte
}
func NewPersister(log *zap.SugaredLogger, db *badger.DB) *Persister {
aso := &Persister{log: log, db: db}
return aso
}
func (p *Persister) Store(model model) error {
err := p.db.Update(model.Save)
return err
}
func (p *Persister) Count(model model) (int, error) {
opts := badger.DefaultIteratorOptions
opts.PrefetchValues = false
var count int
err := p.db.View(func(txn *badger.Txn) error {
it := txn.NewIterator(opts)
defer it.Close()
prefix := []byte(model.Keybase())
for it.Seek(prefix); it.ValidForPrefix([]byte(prefix)); it.Next() {
count++
}
return nil
})
return count, err
}
func (p *Persister) Collect(model model) ([][]byte, error) {
var result [][]byte
err := p.db.View(func(txn *badger.Txn) error {
opts := badger.DefaultIteratorOptions
opts.PrefetchValues = true
it := txn.NewIterator(opts)
defer it.Close()
prefix := []byte(model.Keybase())
for it.Seek(prefix); it.ValidForPrefix(prefix); it.Next() {
item := it.Item()
item.Value(func(v []byte) error {
result = append(result, v)
return nil
})
}
return nil
})
return result, err
}
func (p *Persister) Find(model model) ([]byte, error) {
var result []byte
var item *badger.Item
err := p.db.View(func(txn *badger.Txn) error {
var getErr error
item, getErr = txn.Get([]byte(model.Key()))
if getErr != nil {
return getErr
}
return nil
})
if err != nil {
return nil, err
}
err = item.Value(func(v []byte) error {
result = v
return nil
})
if err != nil {
return nil, err
}
return result, nil
}
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