255 lines
7.2 KiB
Go
255 lines
7.2 KiB
Go
// Copyright 2020 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 stacktrie
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import (
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"bytes"
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"encoding/binary"
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"errors"
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"fmt"
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"hash"
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"io"
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"sort"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/rawdb"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/ethdb"
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"github.com/ethereum/go-ethereum/trie"
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"golang.org/x/crypto/sha3"
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)
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type fuzzer struct {
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input io.Reader
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exhausted bool
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debugging bool
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}
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func (f *fuzzer) read(size int) []byte {
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out := make([]byte, size)
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if _, err := f.input.Read(out); err != nil {
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f.exhausted = true
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}
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return out
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}
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func (f *fuzzer) readSlice(min, max int) []byte {
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var a uint16
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binary.Read(f.input, binary.LittleEndian, &a)
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size := min + int(a)%(max-min)
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out := make([]byte, size)
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if _, err := f.input.Read(out); err != nil {
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f.exhausted = true
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}
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return out
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}
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// spongeDb is a dummy db backend which accumulates writes in a sponge
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type spongeDb struct {
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sponge hash.Hash
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debug bool
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}
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func (s *spongeDb) Has(key []byte) (bool, error) { panic("implement me") }
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func (s *spongeDb) Get(key []byte) ([]byte, error) { return nil, errors.New("no such elem") }
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func (s *spongeDb) Delete(key []byte) error { panic("implement me") }
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func (s *spongeDb) NewBatch() ethdb.Batch { return &spongeBatch{s} }
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func (s *spongeDb) NewBatchWithSize(size int) ethdb.Batch { return &spongeBatch{s} }
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func (s *spongeDb) NewSnapshot() (ethdb.Snapshot, error) { panic("implement me") }
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func (s *spongeDb) Stat(property string) (string, error) { panic("implement me") }
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func (s *spongeDb) Compact(start []byte, limit []byte) error { panic("implement me") }
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func (s *spongeDb) Close() error { return nil }
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func (s *spongeDb) Put(key []byte, value []byte) error {
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if s.debug {
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fmt.Printf("db.Put %x : %x\n", key, value)
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}
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s.sponge.Write(key)
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s.sponge.Write(value)
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return nil
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}
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func (s *spongeDb) NewIterator(prefix []byte, start []byte) ethdb.Iterator { panic("implement me") }
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// spongeBatch is a dummy batch which immediately writes to the underlying spongedb
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type spongeBatch struct {
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db *spongeDb
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}
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func (b *spongeBatch) Put(key, value []byte) error {
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b.db.Put(key, value)
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return nil
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}
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func (b *spongeBatch) Delete(key []byte) error { panic("implement me") }
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func (b *spongeBatch) ValueSize() int { return 100 }
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func (b *spongeBatch) Write() error { return nil }
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func (b *spongeBatch) Reset() {}
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func (b *spongeBatch) Replay(w ethdb.KeyValueWriter) error { return nil }
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type kv struct {
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k, v []byte
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}
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type kvs []kv
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func (k kvs) Len() int {
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return len(k)
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}
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func (k kvs) Less(i, j int) bool {
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return bytes.Compare(k[i].k, k[j].k) < 0
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}
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func (k kvs) Swap(i, j int) {
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k[j], k[i] = k[i], k[j]
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}
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// Fuzz is the fuzzing entry-point.
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// The function must return
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//
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// - 1 if the fuzzer should increase priority of the
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// given input during subsequent fuzzing (for example, the input is lexically
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// correct and was parsed successfully);
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// - -1 if the input must not be added to corpus even if gives new coverage; and
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// - 0 otherwise
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//
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// other values are reserved for future use.
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func Fuzz(data []byte) int {
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f := fuzzer{
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input: bytes.NewReader(data),
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exhausted: false,
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}
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return f.fuzz()
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}
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func Debug(data []byte) int {
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f := fuzzer{
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input: bytes.NewReader(data),
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exhausted: false,
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debugging: true,
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}
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return f.fuzz()
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}
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func (f *fuzzer) fuzz() int {
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// This spongeDb is used to check the sequence of disk-db-writes
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var (
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spongeA = &spongeDb{sponge: sha3.NewLegacyKeccak256()}
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dbA = trie.NewDatabase(rawdb.NewDatabase(spongeA))
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trieA = trie.NewEmpty(dbA)
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spongeB = &spongeDb{sponge: sha3.NewLegacyKeccak256()}
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dbB = trie.NewDatabase(rawdb.NewDatabase(spongeB))
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trieB = trie.NewStackTrie(func(owner common.Hash, path []byte, hash common.Hash, blob []byte) {
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rawdb.WriteTrieNode(spongeB, owner, path, hash, blob, dbB.Scheme())
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})
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vals kvs
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useful bool
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maxElements = 10000
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// operate on unique keys only
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keys = make(map[string]struct{})
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)
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// Fill the trie with elements
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for i := 0; !f.exhausted && i < maxElements; i++ {
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k := f.read(32)
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v := f.readSlice(1, 500)
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if f.exhausted {
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// If it was exhausted while reading, the value may be all zeroes,
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// thus 'deletion' which is not supported on stacktrie
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break
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}
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if _, present := keys[string(k)]; present {
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// This key is a duplicate, ignore it
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continue
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}
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keys[string(k)] = struct{}{}
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vals = append(vals, kv{k: k, v: v})
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trieA.Update(k, v)
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useful = true
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}
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if !useful {
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return 0
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}
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// Flush trie -> database
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rootA, nodes := trieA.Commit(false)
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if nodes != nil {
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dbA.Update(trie.NewWithNodeSet(nodes))
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}
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// Flush memdb -> disk (sponge)
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dbA.Commit(rootA, false)
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// Stacktrie requires sorted insertion
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sort.Sort(vals)
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for _, kv := range vals {
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if f.debugging {
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fmt.Printf("{\"%#x\" , \"%#x\"} // stacktrie.Update\n", kv.k, kv.v)
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}
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trieB.Update(kv.k, kv.v)
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}
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rootB := trieB.Hash()
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trieB.Commit()
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if rootA != rootB {
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panic(fmt.Sprintf("roots differ: (trie) %x != %x (stacktrie)", rootA, rootB))
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}
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sumA := spongeA.sponge.Sum(nil)
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sumB := spongeB.sponge.Sum(nil)
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if !bytes.Equal(sumA, sumB) {
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panic(fmt.Sprintf("sequence differ: (trie) %x != %x (stacktrie)", sumA, sumB))
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}
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// Ensure all the nodes are persisted correctly
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var (
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nodeset = make(map[string][]byte) // path -> blob
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trieC = trie.NewStackTrie(func(owner common.Hash, path []byte, hash common.Hash, blob []byte) {
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if crypto.Keccak256Hash(blob) != hash {
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panic("invalid node blob")
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}
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if owner != (common.Hash{}) {
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panic("invalid node owner")
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}
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nodeset[string(path)] = common.CopyBytes(blob)
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})
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checked int
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)
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for _, kv := range vals {
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trieC.Update(kv.k, kv.v)
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}
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rootC, _ := trieC.Commit()
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if rootA != rootC {
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panic(fmt.Sprintf("roots differ: (trie) %x != %x (stacktrie)", rootA, rootC))
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}
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trieA, _ = trie.New(trie.TrieID(rootA), dbA)
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iterA := trieA.NodeIterator(nil)
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for iterA.Next(true) {
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if iterA.Hash() == (common.Hash{}) {
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if _, present := nodeset[string(iterA.Path())]; present {
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panic("unexpected tiny node")
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}
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continue
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}
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nodeBlob, present := nodeset[string(iterA.Path())]
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if !present {
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panic("missing node")
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}
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if !bytes.Equal(nodeBlob, iterA.NodeBlob()) {
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panic("node blob is not matched")
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}
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checked += 1
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}
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if checked != len(nodeset) {
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panic("node number is not matched")
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}
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return 1
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}
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