github.com/MetalBlockchain/subnet-evm@v0.4.9/trie/errors.go (about)

     1  // (c) 2020-2021, Ava Labs, Inc.
     2  //
     3  // This file is a derived work, based on the go-ethereum library whose original
     4  // notices appear below.
     5  //
     6  // It is distributed under a license compatible with the licensing terms of the
     7  // original code from which it is derived.
     8  //
     9  // Much love to the original authors for their work.
    10  // **********
    11  // Copyright 2015 The go-ethereum Authors
    12  // This file is part of the go-ethereum library.
    13  //
    14  // The go-ethereum library is free software: you can redistribute it and/or modify
    15  // it under the terms of the GNU Lesser General Public License as published by
    16  // the Free Software Foundation, either version 3 of the License, or
    17  // (at your option) any later version.
    18  //
    19  // The go-ethereum library is distributed in the hope that it will be useful,
    20  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    21  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    22  // GNU Lesser General Public License for more details.
    23  //
    24  // You should have received a copy of the GNU Lesser General Public License
    25  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    26  
    27  package trie
    28  
    29  import (
    30  	"fmt"
    31  
    32  	"github.com/ethereum/go-ethereum/common"
    33  )
    34  
    35  // MissingNodeError is returned by the trie functions (TryGet, TryUpdate, TryDelete)
    36  // in the case where a trie node is not present in the local database. It contains
    37  // information necessary for retrieving the missing node.
    38  type MissingNodeError struct {
    39  	Owner    common.Hash // owner of the trie if it's 2-layered trie
    40  	NodeHash common.Hash // hash of the missing node
    41  	Path     []byte      // hex-encoded path to the missing node
    42  	err      error       // concrete error for missing trie node
    43  }
    44  
    45  // Unwrap returns the concrete error for missing trie node which
    46  // allows us for further analysis outside.
    47  func (err *MissingNodeError) Unwrap() error {
    48  	return err.err
    49  }
    50  
    51  func (err *MissingNodeError) Error() string {
    52  	if err.Owner == (common.Hash{}) {
    53  		return fmt.Sprintf("missing trie node %x (path %x) %v", err.NodeHash, err.Path, err.err)
    54  	}
    55  	return fmt.Sprintf("missing trie node %x (owner %x) (path %x) %v", err.NodeHash, err.Owner, err.Path, err.err)
    56  }