feat: Waku v2 bridge

Issue #12610

vendor/github.com/status-im/status-go/db/storage.go

@@ -0,0 +1,75 @@
+package db
+
+import (
+	"github.com/syndtr/goleveldb/leveldb"
+	"github.com/syndtr/goleveldb/leveldb/iterator"
+	"github.com/syndtr/goleveldb/leveldb/storage"
+	"github.com/syndtr/goleveldb/leveldb/util"
+)
+
+// Storage is an interface for common db operations.
+type Storage interface {
+	Put([]byte, []byte) error
+	Delete([]byte) error
+	Get([]byte) ([]byte, error)
+	NewIterator(*util.Range) iterator.Iterator
+}
+
+// CommitStorage allows to write all tx/batched values atomically.
+type CommitStorage interface {
+	Storage
+	Commit() error
+}
+
+// TransactionalStorage adds transaction features on top of regular storage.
+type TransactionalStorage interface {
+	Storage
+	NewTx() CommitStorage
+}
+
+// NewMemoryLevelDBStorage returns LevelDBStorage instance with in memory leveldb backend.
+func NewMemoryLevelDBStorage() (LevelDBStorage, error) {
+	mdb, err := leveldb.Open(storage.NewMemStorage(), nil)
+	if err != nil {
+		return LevelDBStorage{}, err
+	}
+	return NewLevelDBStorage(mdb), nil
+}
+
+// NewLevelDBStorage creates new LevelDBStorage instance.
+func NewLevelDBStorage(db *leveldb.DB) LevelDBStorage {
+	return LevelDBStorage{db: db}
+}
+
+// LevelDBStorage wrapper around leveldb.DB.
+type LevelDBStorage struct {
+	db *leveldb.DB
+}
+
+// Put upserts given key/value pair.
+func (db LevelDBStorage) Put(key, buf []byte) error {
+	return db.db.Put(key, buf, nil)
+}
+
+// Delete removes given key from database..
+func (db LevelDBStorage) Delete(key []byte) error {
+	return db.db.Delete(key, nil)
+}
+
+// Get returns value for a given key.
+func (db LevelDBStorage) Get(key []byte) ([]byte, error) {
+	return db.db.Get(key, nil)
+}
+
+// NewIterator returns new leveldb iterator.Iterator instance for a given range.
+func (db LevelDBStorage) NewIterator(slice *util.Range) iterator.Iterator {
+	return db.db.NewIterator(slice, nil)
+}
+
+// NewTx is a wrapper around leveldb.Batch that allows to write atomically.
+func (db LevelDBStorage) NewTx() CommitStorage {
+	return LevelDBTx{
+		batch: &leveldb.Batch{},
+		db:    db,
+	}
+}