ethdb

type BucketsMigrator interface {
	BucketExists(bucket string) (bool, error) // makes them empty
	ClearBuckets(buckets ...string) error     // makes them empty
	DropBuckets(buckets ...string) error      // drops them, use of them after drop will panic
}

type DBGetter interface {
	kv.Getter

	// Get returns the value for a given key if it's present.
	Get(bucket string, key []byte) ([]byte, error)
}

type Database interface {
	DBGetter
	kv.Putter
	kv.Deleter
	kv.Closer

	Begin(ctx context.Context, flags TxFlags) (DbWithPendingMutations, error) // starts db transaction
	Last(bucket string) ([]byte, []byte, error)

	IncrementSequence(bucket string, amount uint64) (uint64, error)
	ReadSequence(bucket string) (uint64, error)
	RwKV() kv.RwDB
}

type DbWithPendingMutations interface {
	Database

	// Commit - commits transaction (or flush data into underlying db object in case of `mutation`)
	//
	// Common pattern:
	//
	// tx := db.Begin()
	// defer tx.Rollback()
	// ... some calculations on `tx`
	// tx.Commit()
	//
	Commit() error

	Rollback()
	BatchSize() int
}

type HasRwKV interface {
	RwKV() kv.RwDB
	SetRwKV(kv kv.RwDB)
}

type HasTx interface {
	Tx() kv.Tx
}

type MinDatabase interface {
	Get(bucket string, key []byte) ([]byte, error)
	Put(table string, k, v []byte) error
	Delete(table string, k []byte) error
}

type TxFlags uint