95 lines
3.1 KiB
Go
95 lines
3.1 KiB
Go
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// Copyright 2024 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 pathdb
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import (
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"fmt"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/hexutil"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/triedb/database"
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)
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// The types of locations where the node is found.
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const (
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locDirtyCache = "dirty" // dirty cache
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locCleanCache = "clean" // clean cache
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locDiskLayer = "disk" // persistent state
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locDiffLayer = "diff" // diff layers
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)
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// nodeLoc is a helpful structure that contains the location where the node
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// is found, as it's useful for debugging purposes.
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type nodeLoc struct {
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loc string
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depth int
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}
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// string returns the string representation of node location.
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func (loc *nodeLoc) string() string {
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return fmt.Sprintf("loc: %s, depth: %d", loc.loc, loc.depth)
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}
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// reader implements the database.Reader interface, providing the functionalities to
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// retrieve trie nodes by wrapping the internal state layer.
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type reader struct {
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layer layer
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noHashCheck bool
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}
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// Node implements database.Reader interface, retrieving the node with specified
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// node info. Don't modify the returned byte slice since it's not deep-copied
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// and still be referenced by database.
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func (r *reader) Node(owner common.Hash, path []byte, hash common.Hash) ([]byte, error) {
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blob, got, loc, err := r.layer.node(owner, path, 0)
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if err != nil {
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return nil, err
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}
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// Error out if the local one is inconsistent with the target.
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if !r.noHashCheck && got != hash {
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// Location is always available even if the node
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// is not found.
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switch loc.loc {
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case locCleanCache:
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cleanFalseMeter.Mark(1)
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case locDirtyCache:
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dirtyFalseMeter.Mark(1)
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case locDiffLayer:
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diffFalseMeter.Mark(1)
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case locDiskLayer:
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diskFalseMeter.Mark(1)
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}
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blobHex := "nil"
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if len(blob) > 0 {
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blobHex = hexutil.Encode(blob)
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}
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log.Error("Unexpected trie node", "location", loc.loc, "owner", owner, "path", path, "expect", hash, "got", got, "blob", blobHex)
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return nil, fmt.Errorf("unexpected node: (%x %v), %x!=%x, %s, blob: %s", owner, path, hash, got, loc.string(), blobHex)
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}
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return blob, nil
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}
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// Reader retrieves a layer belonging to the given state root.
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func (db *Database) Reader(root common.Hash) (database.Reader, error) {
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layer := db.tree.get(root)
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if layer == nil {
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return nil, fmt.Errorf("state %#x is not available", root)
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}
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return &reader{layer: layer, noHashCheck: db.isVerkle}, nil
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}
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