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badger_backend.go
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badger_backend.go
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package bstore
import (
"errors"
"strings"
"github.com/dgraph-io/badger/v3"
"go.uber.org/zap"
)
// BadgerBackend Badger backend implementation
type BadgerBackend struct {
DB *badger.DB
}
// NewBadgerBackend BadgerBackend constructor
func NewBadgerBackend(opts badger.Options) (*BadgerBackend, error) {
badgerDB, err := badger.Open(opts)
return &BadgerBackend{DB: badgerDB}, err
}
// Close cleans backend resources
func (backend *BadgerBackend) Close() {
backend.DB.Close()
}
// Reset resets the database
func (backend *BadgerBackend) Reset() error {
return backend.DB.DropAll()
}
// Put backend setter
func (backend *BadgerBackend) Put(key, value []byte) error {
if key == nil {
return errors.New("cannot put a nil key")
}
if value == nil {
return errors.New("cannot put a nil value")
}
return backend.DB.Update(func(txn *badger.Txn) error {
return txn.Set(key, value)
})
}
// Delete an item from the database
func (backend *BadgerBackend) Delete(key []byte) error {
if key == nil {
return errors.New("cannot remove a nil key")
}
return backend.DB.Update(func(txn *badger.Txn) error {
return txn.Delete(key)
})
}
// Get backend getter
func (backend *BadgerBackend) Get(key []byte) ([]byte, error) {
var value []byte = nil
if key == nil {
return value, errors.New("cannot get a nil key")
}
err := backend.DB.View(func(txn *badger.Txn) error {
item, err := txn.Get(key)
if err == badger.ErrKeyNotFound {
value = make([]byte, 0)
return nil
} else if err != nil {
return err
}
err = item.Value(func(val []byte) error {
value = append([]byte{}, val...)
return nil
})
return err
})
return value, err
}
// KoinosBadgerLogger implements the badger.Logger interface in roder to pass badger logs the the koinos logger
type KoinosBadgerLogger struct {
}
// Errorf implements formatted error message handling for badger
func (kbl KoinosBadgerLogger) Errorf(msg string, args ...interface{}) {
zap.S().Errorf(strings.TrimSpace(msg), args...)
}
// Warningf implements formatted warning message handling for badger
func (kbl KoinosBadgerLogger) Warningf(msg string, args ...interface{}) {
zap.S().Warnf(strings.TrimSpace(msg), args...)
}
// Infof implements formatted info message handling for badger
func (kbl KoinosBadgerLogger) Infof(msg string, args ...interface{}) {
zap.S().Infof(strings.TrimSpace(msg), args...)
}
// Debugf implements formatted debug message handling for badger
func (kbl KoinosBadgerLogger) Debugf(msg string, args ...interface{}) {
zap.S().Debugf(strings.TrimSpace(msg), args...)
}