prysm-pulse/beacon-chain/db/kv/kv.go

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package kv
import (
"os"
"path"
"time"
"github.com/boltdb/bolt"
"github.com/pkg/errors"
)
// Store defines an implementation of the Prysm Database interface
// using BoltDB as the underlying persistent kv-store for eth2.
type Store struct {
db *bolt.DB
databasePath string
}
// NewKVStore initializes a new boltDB key-value store at the directory
// path specified, creates the kv-buckets based on the schema, and stores
// an open connection db object as a property of the Store struct.
func NewKVStore(dirPath string) (*Store, error) {
if err := os.MkdirAll(dirPath, 0700); err != nil {
return nil, err
}
datafile := path.Join(dirPath, "beaconchain.db")
boltDB, err := bolt.Open(datafile, 0600, &bolt.Options{Timeout: 1 * time.Second})
if err != nil {
if err == bolt.ErrTimeout {
return nil, errors.New("cannot obtain database lock, database may be in use by another process")
}
return nil, err
}
kv := &Store{db: boltDB, databasePath: dirPath}
if err := kv.db.Update(func(tx *bolt.Tx) error {
return createBuckets(
tx,
attestationsBucket,
blocksBucket,
stateBucket,
validatorsBucket,
// Indices buckets.
attestationShardIndicesBucket,
attestationParentRootIndicesBucket,
attestationStartEpochIndicesBucket,
attestationEndEpochIndicesBucket,
blockSlotIndicesBucket,
blockParentRootIndicesBucket,
)
}); err != nil {
return nil, err
}
return kv, err
}
// ClearDB removes the previously stored directory at the data directory.
func (k *Store) ClearDB() error {
if _, err := os.Stat(k.databasePath); os.IsNotExist(err) {
return nil
}
return os.RemoveAll(k.databasePath)
}
// Close closes the underlying BoltDB database.
func (k *Store) Close() error {
return k.db.Close()
}
// DatabasePath at which this database writes files.
func (k *Store) DatabasePath() string {
return k.databasePath
}
func createBuckets(tx *bolt.Tx, buckets ...[]byte) error {
for _, bucket := range buckets {
if _, err := tx.CreateBucketIfNotExists(bucket); err != nil {
return err
}
}
return nil
}