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database.go
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database.go
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package database
import (
"context"
"errors"
"io"
"time"
badger "github.com/dgraph-io/badger/v3"
"github.com/rs/zerolog"
)
type Database struct {
db *badger.DB
}
func Open(path string) (Database, error) {
if path == "" {
path = "/tmp/peristera"
}
db, err := badger.Open(
badger.DefaultOptions(path).
WithMaxLevels(2). //nolint:gomnd
WithValueLogMaxEntries(50). //nolint:gomnd
WithIndexCacheSize(5 << 20), //nolint:gomnd // 5mb
)
if err != nil {
return Database{}, err
}
return Database{
db: db,
}, nil
}
func (d Database) DB() *badger.DB {
return d.db
}
func (d Database) Close() error {
return d.DB().Close()
}
func (d Database) Backup(w io.Writer) error {
_, err := d.DB().Backup(w, 0)
return err
}
func (d Database) Load(r io.Reader) error {
return d.DB().Load(r, 1)
}
// MissingKeys return missing keys in database.
func (d Database) MissingKeys(ctx context.Context, keys [][]byte) ([][]byte, error) {
out := make([][]byte, 0)
err := d.DB().View(func(txn *badger.Txn) error {
for _, key := range keys {
_, err := txn.Get(key)
if err == nil {
// key found, ignore
continue
}
if errors.Is(err, badger.ErrKeyNotFound) {
out = append(out, key)
continue
}
return err
}
return nil
})
return out, err
}
func (d Database) Worker(ctx context.Context) {
ticker := time.NewTicker(10 * time.Minute) //nolint:gomnd
logger := zerolog.Ctx(ctx).
With().
Str("context", "database:worker").
Logger()
defer ticker.Stop()
for {
select {
case <-ctx.Done():
logger.Info().Msg("Stopping worker")
_ = d.DB().RunValueLogGC(1)
return
case <-ticker.C:
logger.Info().Msg("Running CG")
err := d.DB().RunValueLogGC(0.7) //nolint:gomnd
if err != nil {
logger.Error().Err(err).Msg("Fail to run GC")
}
}
}
}