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// Copyright 2016 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 state
import (
"math/big"
"testing"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/ethdb"
)
// Tests that updating a state trie does not leak any database writes prior to
// actually committing the state.
func TestUpdateLeaks(t *testing.T) {
// Create an empty state database
db, _ := ethdb.NewMemDatabase()
state, _ := New(common.Hash{}, db)
// Update it with some accounts
for i := byte(0); i < 255; i++ {
obj := state.GetOrNewStateObject(common.BytesToAddress([]byte{i}))
obj.AddBalance(big.NewInt(int64(11 * i)))
obj.SetNonce(uint64(42 * i))
if i%2 == 0 {
obj.SetState(common.BytesToHash([]byte{i, i, i}), common.BytesToHash([]byte{i, i, i, i}))
}
if i%3 == 0 {
obj.SetCode(crypto.Keccak256Hash([]byte{i, i, i, i, i}), []byte{i, i, i, i, i})
}
state.UpdateStateObject(obj)
}
// Ensure that no data was leaked into the database
for _, key := range db.Keys() {
value, _ := db.Get(key)
t.Errorf("State leaked into database: %x -> %x", key, value)
}
}
// Tests that no intermediate state of an object is stored into the database,
// only the one right before the commit.
func TestIntermediateLeaks(t *testing.T) {
// Create two state databases, one transitioning to the final state, the other final from the beginning
transDb, _ := ethdb.NewMemDatabase()
finalDb, _ := ethdb.NewMemDatabase()
transState, _ := New(common.Hash{}, transDb)
finalState, _ := New(common.Hash{}, finalDb)
// Update the states with some objects
for i := byte(0); i < 255; i++ {
// Create a new state object with some data into the transition database
obj := transState.GetOrNewStateObject(common.BytesToAddress([]byte{i}))
obj.SetBalance(big.NewInt(int64(11 * i)))
obj.SetNonce(uint64(42 * i))
if i%2 == 0 {
obj.SetState(common.BytesToHash([]byte{i, i, i, 0}), common.BytesToHash([]byte{i, i, i, i, 0}))
}
if i%3 == 0 {
obj.SetCode(crypto.Keccak256Hash([]byte{i, i, i, i, i, 0}), []byte{i, i, i, i, i, 0})
}
transState.UpdateStateObject(obj)
// Overwrite all the data with new values in the transition database
obj.SetBalance(big.NewInt(int64(11*i + 1)))
obj.SetNonce(uint64(42*i + 1))
if i%2 == 0 {
obj.SetState(common.BytesToHash([]byte{i, i, i, 0}), common.Hash{})
obj.SetState(common.BytesToHash([]byte{i, i, i, 1}), common.BytesToHash([]byte{i, i, i, i, 1}))
}
if i%3 == 0 {
obj.SetCode(crypto.Keccak256Hash([]byte{i, i, i, i, i, 1}), []byte{i, i, i, i, i, 1})
}
transState.UpdateStateObject(obj)
// Create the final state object directly in the final database
obj = finalState.GetOrNewStateObject(common.BytesToAddress([]byte{i}))
obj.SetBalance(big.NewInt(int64(11*i + 1)))
obj.SetNonce(uint64(42*i + 1))
if i%2 == 0 {
obj.SetState(common.BytesToHash([]byte{i, i, i, 1}), common.BytesToHash([]byte{i, i, i, i, 1}))
}
if i%3 == 0 {
obj.SetCode(crypto.Keccak256Hash([]byte{i, i, i, i, i, 1}), []byte{i, i, i, i, i, 1})
}
finalState.UpdateStateObject(obj)
}
if _, err := transState.Commit(); err != nil {
t.Fatalf("failed to commit transition state: %v", err)
}
if _, err := finalState.Commit(); err != nil {
t.Fatalf("failed to commit final state: %v", err)
}
// Cross check the databases to ensure they are the same
for _, key := range finalDb.Keys() {
if _, err := transDb.Get(key); err != nil {
val, _ := finalDb.Get(key)
t.Errorf("entry missing from the transition database: %x -> %x", key, val)
}
}
for _, key := range transDb.Keys() {
if _, err := finalDb.Get(key); err != nil {
val, _ := transDb.Get(key)
t.Errorf("extra entry in the transition database: %x -> %x", key, val)
}
}
}
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