6d2aeb43d5
The state availability is checked during the creation of a state reader.
- In hash-based database, if the specified root node does not exist on disk disk, then
the state reader won't be created and an error will be returned.
- In path-based database, if the specified state layer is not available, then the
state reader won't be created and an error will be returned.
This change also contains a stricter semantics regarding the `Commit` operation: once it has been performed, the trie is no longer usable, and certain operations will return an error.
53 lines
2.0 KiB
Go
53 lines
2.0 KiB
Go
// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package trie
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import (
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"errors"
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"fmt"
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"github.com/ethereum/go-ethereum/common"
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)
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// ErrCommitted is returned when a already committed trie is requested for usage.
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// The potential usages can be `Get`, `Update`, `Delete`, `NodeIterator`, `Prove`
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// and so on.
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var ErrCommitted = errors.New("trie is already committed")
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// MissingNodeError is returned by the trie functions (Get, Update, Delete)
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// in the case where a trie node is not present in the local database. It contains
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// information necessary for retrieving the missing node.
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type MissingNodeError struct {
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Owner common.Hash // owner of the trie if it's 2-layered trie
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NodeHash common.Hash // hash of the missing node
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Path []byte // hex-encoded path to the missing node
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err error // concrete error for missing trie node
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}
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// Unwrap returns the concrete error for missing trie node which
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// allows us for further analysis outside.
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func (err *MissingNodeError) Unwrap() error {
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return err.err
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}
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func (err *MissingNodeError) Error() string {
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if err.Owner == (common.Hash{}) {
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return fmt.Sprintf("missing trie node %x (path %x) %v", err.NodeHash, err.Path, err.err)
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}
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return fmt.Sprintf("missing trie node %x (owner %x) (path %x) %v", err.NodeHash, err.Owner, err.Path, err.err)
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}
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