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db.go
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db.go
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package badger
import (
"errors"
"os"
"github.com/AccumulateNetwork/SMT/storage"
"github.com/dgraph-io/badger"
)
type DB struct {
DBHome string
badgerDB *badger.DB
}
var _ storage.KeyValueDB = (*DB)(nil)
// Close
// Close the underlying database
func (d *DB) Close() error {
return d.badgerDB.Close()
}
// InitDB
// Initialize the database by the given filename (includes directory path).
// This will certainly open an existing database, but will also initialize
// an new, empty database.
func (d *DB) InitDB(filepath string) error {
// Make sure all directories exist
err := os.MkdirAll(filepath, 0777)
if err != nil {
return errors.New("failed to create home directory")
}
d.DBHome = filepath
// Open Badger
d.badgerDB, err = badger.Open(badger.DefaultOptions(d.DBHome))
if err != nil { // Panic if we can't open Badger
return err
}
return nil
}
// Get
// Look in the given bucket, and return the key found. Returns nil if no value
// is found for the given key
func (d *DB) Get(key [storage.KeyLength]byte) (value []byte) {
err := d.badgerDB.View(func(txn *badger.Txn) error {
item, err := txn.Get(key[:])
if err != nil {
return err
}
err = item.Value(func(val []byte) error {
value = append(value, val...)
return nil
})
return err
})
// If anything goes wrong, return nil
if err != nil {
return nil
}
// If we didn't find the value, we will return a nil here.
return value
}
// Put
// Put a key/value in the database. We return an error if there was a problem
// writing the key/value pair to the database.
func (d *DB) Put(key [storage.KeyLength]byte, value []byte) error {
// Update the key/value in the database
err := d.badgerDB.Update(func(txn *badger.Txn) error {
err := txn.Set(key[:], value)
return err
})
return err
}
// PutBatch
// Write all the transactions in a given batch of pending transactions. The
// batch is emptied, so it can be reused.
func (d *DB) PutBatch(TXList []storage.TX) error {
txn := d.badgerDB.NewTransaction(true)
for _, e := range TXList {
if err := txn.Set(e.Key[:], e.Value); err != nil {
panic(err)
}
}
if err := txn.Commit(); err != nil {
panic(err)
}
return nil
}