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package models
import (
"github.com/dgraph-io/badger/v3"
lru "github.com/hashicorp/golang-lru/v2"
"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 {
logger := log.With("type", "db")
aso := &Persister{log: logger, db: db}
return aso
}
func (p *Persister) StoreWithCallback(m model, onSave func()) error {
return p.storeModel(m, onSave)
}
func (p *Persister) Store(m model) error {
return p.storeModel(m, func() {})
}
func (p *Persister) storeModel(model model, onSave func()) error {
log := p.log.With("model", model.Name()).With("DedupKey", model.DedupKey()).With("Key", model.Key())
log.Debug("Store()")
err := p.db.View(func(txn *badger.Txn) error {
var getErr error
var updateErr error
log.Debug("checking")
_, getErr = txn.Get([]byte(model.DedupKey()))
if getErr == badger.ErrKeyNotFound {
log.Debug("not found")
updateErr = p.db.Update(model.Save) // stores the outbox item
if updateErr != nil {
return updateErr
}
log.Debug("saving and calling storeCallback")
updateErr = p.db.Update(model.SaveDedup) // stores the sha256
onSave()
}
return updateErr
})
return err
}
func (p *Persister) Delete(model model) error {
log := p.log.With("model", model.Name()).With("DedupKey", model.DedupKey()).With("Key", model.Key())
log.Debug("Delete()")
err := p.db.Update(func(txn *badger.Txn) error {
txn.Delete([]byte(model.Key()))
return nil
})
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
}
// Much faster, "keys only" version of Collect()
func (p *Persister) CollectKeys(model model) ([][]byte, error) {
var keys [][]byte
err := p.db.View(func(txn *badger.Txn) error {
opts := badger.DefaultIteratorOptions
opts.PrefetchValues = false
it := txn.NewIterator(opts)
defer it.Close()
prefix := []byte(model.Keybase())
for it.Seek(prefix); it.ValidForPrefix(prefix); it.Next() {
keys = append(keys, it.Item().Key())
}
return nil
})
return keys, err
}
// CollectRecent grabs the last n from a collection in an efficient way
func (p *Persister) CollectRecent(model model, n int) ([][]byte, error) {
keys, err := lru.New[string, string](n)
if err != nil {
return nil, err
}
err = p.db.View(func(txn *badger.Txn) error {
opts := badger.DefaultIteratorOptions
opts.PrefetchValues = false
it := txn.NewIterator(opts)
defer it.Close()
prefix := []byte(model.Keybase())
for it.Seek(prefix); it.ValidForPrefix(prefix); it.Next() {
keys.Add(string(it.Item().Key()), "")
}
return nil
})
var results [][]byte
for _, k := range keys.Keys() {
err := p.db.View(func(txn *badger.Txn) error {
var getErr error
item, getErr := txn.Get([]byte(k))
if getErr != nil {
return getErr
}
getErr = item.Value(func(v []byte) error {
results = append(results, v)
return nil
})
return nil
})
if err != nil {
return nil, err
}
}
return results, err
}
func (p *Persister) Find(model model) ([]byte, error) {
var result []byte
var item *badger.Item
var notFound bool
err := p.db.View(func(txn *badger.Txn) error {
var getErr error
item, getErr = txn.Get([]byte(model.Key()))
if getErr == badger.ErrKeyNotFound {
notFound = true
return nil
}
if getErr != nil {
return getErr
}
return nil
})
if notFound {
return nil, nil // on key not found we want to return nil, so that gin returns 404 and not 500
}
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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