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asdlfkjasf23oiejfasdfadkfqlkjfasdlkfjalwk4jfalsdkfjawlefkjsadlfkjasldkfjwalefkjasdlfkjM |
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// Copyright 2019 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/>. | ||
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package trie | ||
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import ( | ||
"bytes" | ||
"encoding/binary" | ||
"fmt" | ||
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"github.com/ethereum/go-ethereum/core/rawdb" | ||
"github.com/ethereum/go-ethereum/trie" | ||
"github.com/gballet/go-verkle" | ||
) | ||
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// randTest performs random trie operations. | ||
// Instances of this test are created by Generate. | ||
type randTest []randTestStep | ||
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type randTestStep struct { | ||
op int | ||
key []byte // for opUpdate, opGet | ||
value []byte // for opUpdate | ||
err error // for debugging | ||
} | ||
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type proofDb struct{} | ||
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func (proofDb) Put(key []byte, value []byte) error { | ||
return nil | ||
} | ||
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func (proofDb) Delete(key []byte) error { | ||
return nil | ||
} | ||
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const ( | ||
opUpdate = iota | ||
opGet | ||
opCommit | ||
opHash | ||
//opReset | ||
opItercheckhash | ||
//opProve TODO? | ||
opMax // boundary value, not an actual op | ||
) | ||
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type dataSource struct { | ||
input []byte | ||
reader *bytes.Reader | ||
} | ||
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func newDataSource(input []byte) *dataSource { | ||
return &dataSource{ | ||
input, bytes.NewReader(input), | ||
} | ||
} | ||
func (ds *dataSource) readByte() byte { | ||
if b, err := ds.reader.ReadByte(); err != nil { | ||
return 0 | ||
} else { | ||
return b | ||
} | ||
} | ||
func (ds *dataSource) Read(buf []byte) (int, error) { | ||
return ds.reader.Read(buf) | ||
} | ||
func (ds *dataSource) Ended() bool { | ||
return ds.reader.Len() == 0 | ||
} | ||
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func Generate(input []byte) randTest { | ||
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var allKeys [][]byte | ||
r := newDataSource(input) | ||
genKey := func() []byte { | ||
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if len(allKeys) < 2 || r.readByte() < 0x0f { | ||
// new key | ||
key := make([]byte, 32) | ||
r.Read(key) | ||
allKeys = append(allKeys, key) | ||
return key | ||
} | ||
// use existing key | ||
return allKeys[int(r.readByte())%len(allKeys)] | ||
} | ||
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var steps randTest | ||
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for i := 0; !r.Ended(); i++ { | ||
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step := randTestStep{op: int(r.readByte()) % opMax} | ||
switch step.op { | ||
case opUpdate: | ||
step.key = genKey() | ||
step.value = make([]byte, 32) | ||
binary.BigEndian.PutUint64(step.value, uint64(i)) | ||
case opGet: | ||
step.key = genKey() | ||
} | ||
steps = append(steps, step) | ||
if len(steps) > 500 { | ||
break | ||
} | ||
} | ||
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return steps | ||
} | ||
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// The function must return | ||
// 1 if the fuzzer should increase priority of the | ||
// given input during subsequent fuzzing (for example, the input is lexically | ||
// correct and was parsed successfully); | ||
// -1 if the input must not be added to corpus even if gives new coverage; and | ||
// 0 otherwise | ||
// other values are reserved for future use. | ||
func Fuzz(input []byte) int { | ||
program := Generate(input) | ||
if len(program) == 0 { | ||
return 0 | ||
} | ||
if err := runRandTest(program); err != nil { | ||
panic(err) | ||
} | ||
return 1 | ||
} | ||
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func runRandTest(rt randTest) error { | ||
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verkle.GetConfig() | ||
triedb := trie.NewDatabaseWithConfig(rawdb.NewMemoryDatabase(), &trie.Config{UseVerkle: true}) | ||
tr := trie.NewVerkleTrie(verkle.New(), triedb) | ||
values := make(map[string]string) // tracks content of the trie | ||
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for i, step := range rt { | ||
switch step.op { | ||
case opUpdate: | ||
// XXX check errors here? | ||
_ = tr.TryUpdate(step.key, step.value) | ||
values[string(step.key)] = string(step.value) | ||
case opGet: | ||
// XXX check errors here? | ||
v, _ := tr.TryGet(step.key) | ||
want := values[string(step.key)] | ||
if string(v) != want { | ||
rt[i].err = fmt.Errorf("mismatch for key 0x%x, got 0x%x want 0x%x", step.key, v, want) | ||
} | ||
case opCommit: | ||
_, _, rt[i].err = tr.Commit(nil) | ||
case opHash: | ||
tr.Hash() | ||
/* | ||
TODO | ||
case opReset: | ||
hash, _, err := tr.Commit(nil) | ||
if err != nil { | ||
return err | ||
} | ||
newtr := trie.NewVerkleTrie(hash, triedb) | ||
tr = newtr | ||
*/ | ||
case opItercheckhash: | ||
checktr := trie.NewVerkleTrie(verkle.New(), triedb) | ||
it := trie.NewIterator(tr.NodeIterator(nil)) | ||
for it.Next() { | ||
checktr.TryUpdate(it.Key, it.Value) | ||
} | ||
if tr.Hash() != checktr.Hash() { | ||
return fmt.Errorf("hash mismatch in opItercheckhash") | ||
} | ||
} | ||
// Abort the test on error. | ||
if rt[i].err != nil { | ||
return rt[i].err | ||
} | ||
} | ||
return nil | ||
} |