Official Go implementation of the Ethereum protocol
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go-ethereum/triedb/pathdb/reader.go

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3.1 KiB

// Copyright 2024 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>
package pathdb
import (
"fmt"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/triedb/database"
)
// The types of locations where the node is found.
const (
locDirtyCache = "dirty" // dirty cache
locCleanCache = "clean" // clean cache
locDiskLayer = "disk" // persistent state
locDiffLayer = "diff" // diff layers
)
// nodeLoc is a helpful structure that contains the location where the node
// is found, as it's useful for debugging purposes.
type nodeLoc struct {
loc string
depth int
}
// string returns the string representation of node location.
func (loc *nodeLoc) string() string {
return fmt.Sprintf("loc: %s, depth: %d", loc.loc, loc.depth)
}
// reader implements the database.Reader interface, providing the functionalities to
// retrieve trie nodes by wrapping the internal state layer.
type reader struct {
layer layer
noHashCheck bool
}
// Node implements database.Reader interface, retrieving the node with specified
// node info. Don't modify the returned byte slice since it's not deep-copied
// and still be referenced by database.
func (r *reader) Node(owner common.Hash, path []byte, hash common.Hash) ([]byte, error) {
blob, got, loc, err := r.layer.node(owner, path, 0)
if err != nil {
return nil, err
}
// Error out if the local one is inconsistent with the target.
if !r.noHashCheck && got != hash {
// Location is always available even if the node
// is not found.
switch loc.loc {
case locCleanCache:
cleanFalseMeter.Mark(1)
case locDirtyCache:
dirtyFalseMeter.Mark(1)
case locDiffLayer:
diffFalseMeter.Mark(1)
case locDiskLayer:
diskFalseMeter.Mark(1)
}
blobHex := "nil"
if len(blob) > 0 {
blobHex = hexutil.Encode(blob)
}
log.Error("Unexpected trie node", "location", loc.loc, "owner", owner, "path", path, "expect", hash, "got", got, "blob", blobHex)
return nil, fmt.Errorf("unexpected node: (%x %v), %x!=%x, %s, blob: %s", owner, path, hash, got, loc.string(), blobHex)
}
return blob, nil
}
// Reader retrieves a layer belonging to the given state root.
func (db *Database) Reader(root common.Hash) (database.Reader, error) {
layer := db.tree.get(root)
if layer == nil {
return nil, fmt.Errorf("state %#x is not available", root)
}
return &reader{layer: layer, noHashCheck: db.isVerkle}, nil
}