github.com/bcskill/bcschain/v3@v3.4.9-beta2/core/rawdb/interfaces.go (about)

     1  // Copyright 2018 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package rawdb
    18  
    19  // DatabaseReader wraps the Has and Get method of a backing data store.
    20  type DatabaseReader interface {
    21  	Has(key []byte) (bool, error)
    22  	// Get returns the data for key, or an error. Must return common.ErrNotFound when not found.
    23  	Get(key []byte) ([]byte, error)
    24  }
    25  
    26  // DatabaseWriter wraps the Put method of a backing data store.
    27  type DatabaseWriter interface {
    28  	Put(key []byte, value []byte) error
    29  }
    30  
    31  // DatabaseDeleter wraps the Delete method of a backing data store.
    32  type DatabaseDeleter interface {
    33  	Delete(key []byte) error
    34  }