1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
package l2
import (
"fmt"
"math/big"
"testing"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/rawdb"
"github.com/ethereum/go-ethereum/core/state"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/ethdb/memorydb"
"github.com/ethereum/go-ethereum/params"
"github.com/stretchr/testify/require"
)
var (
userAccount = common.HexToAddress("0x1111")
codeAccount = common.HexToAddress("0x2222")
unknownAccount = common.HexToAddress("0x3333")
)
// Should implement the KeyValueStore API
var _ ethdb.KeyValueStore = (*OracleKeyValueStore)(nil)
func TestGet(t *testing.T) {
t.Run("UnknownKey", func(t *testing.T) {
oracle := newStubStateOracle()
db := NewOracleBackedDB(oracle)
val, err := db.Get(common.Hash{}.Bytes())
require.Error(t, err)
require.Nil(t, val)
})
t.Run("IncorrectLengthKey", func(t *testing.T) {
oracle := newStubStateOracle()
db := NewOracleBackedDB(oracle)
val, err := db.Get([]byte{1, 2, 3})
require.ErrorIs(t, err, ErrInvalidKeyLength)
require.Nil(t, val)
})
t.Run("KeyWithCodePrefix", func(t *testing.T) {
oracle := newStubStateOracle()
db := NewOracleBackedDB(oracle)
key := common.HexToHash("0x12345678")
prefixedKey := append(rawdb.CodePrefix, key.Bytes()...)
expected := []byte{1, 2, 3}
oracle.code[key] = expected
val, err := db.Get(prefixedKey)
require.NoError(t, err)
require.Equal(t, expected, val)
})
t.Run("NormalKeyThatHappensToStartWithCodePrefix", func(t *testing.T) {
oracle := newStubStateOracle()
db := NewOracleBackedDB(oracle)
key := make([]byte, common.HashLength)
copy(rawdb.CodePrefix, key)
println(key[0])
expected := []byte{1, 2, 3}
oracle.data[common.BytesToHash(key)] = expected
val, err := db.Get(key)
require.NoError(t, err)
require.Equal(t, expected, val)
})
t.Run("KnownKey", func(t *testing.T) {
key := common.HexToHash("0xAA4488")
expected := []byte{2, 6, 3, 8}
oracle := newStubStateOracle()
oracle.data[key] = expected
db := NewOracleBackedDB(oracle)
val, err := db.Get(key.Bytes())
require.NoError(t, err)
require.Equal(t, expected, val)
})
}
func TestPut(t *testing.T) {
t.Run("NewKey", func(t *testing.T) {
oracle := newStubStateOracle()
db := NewOracleBackedDB(oracle)
key := common.HexToHash("0xAA4488")
value := []byte{2, 6, 3, 8}
err := db.Put(key.Bytes(), value)
require.NoError(t, err)
actual, err := db.Get(key.Bytes())
require.NoError(t, err)
require.Equal(t, value, actual)
})
t.Run("ReplaceKey", func(t *testing.T) {
oracle := newStubStateOracle()
db := NewOracleBackedDB(oracle)
key := common.HexToHash("0xAA4488")
value1 := []byte{2, 6, 3, 8}
value2 := []byte{1, 2, 3}
err := db.Put(key.Bytes(), value1)
require.NoError(t, err)
err = db.Put(key.Bytes(), value2)
require.NoError(t, err)
actual, err := db.Get(key.Bytes())
require.NoError(t, err)
require.Equal(t, value2, actual)
})
}
func TestSupportsStateDBOperations(t *testing.T) {
l2Genesis := createGenesis()
realDb := rawdb.NewDatabase(memorydb.New())
genesisBlock := l2Genesis.MustCommit(realDb)
loader := &kvStateOracle{
source: realDb,
}
assertStateDataAvailable(t, NewOracleBackedDB(loader), l2Genesis, genesisBlock)
}
func TestUpdateState(t *testing.T) {
l2Genesis := createGenesis()
oracle := newStubStateOracle()
db := rawdb.NewDatabase(NewOracleBackedDB(oracle))
genesisBlock := l2Genesis.MustCommit(db)
assertStateDataAvailable(t, db, l2Genesis, genesisBlock)
statedb, err := state.New(genesisBlock.Root(), state.NewDatabase(rawdb.NewDatabase(db)), nil)
require.NoError(t, err)
statedb.SetBalance(userAccount, big.NewInt(50))
require.Equal(t, big.NewInt(50), statedb.GetBalance(userAccount))
statedb.SetNonce(userAccount, uint64(5))
require.Equal(t, uint64(5), statedb.GetNonce(userAccount))
statedb.SetBalance(unknownAccount, big.NewInt(60))
require.Equal(t, big.NewInt(60), statedb.GetBalance(unknownAccount))
statedb.SetCode(codeAccount, []byte{1})
require.Equal(t, []byte{1}, statedb.GetCode(codeAccount))
// Changes should be available under the new state root after committing
newRoot, err := statedb.Commit(false)
require.NoError(t, err)
err = statedb.Database().TrieDB().Commit(newRoot, true)
require.NoError(t, err)
statedb, err = state.New(newRoot, state.NewDatabase(rawdb.NewDatabase(db)), nil)
require.NoError(t, err)
require.Equal(t, big.NewInt(50), statedb.GetBalance(userAccount))
require.Equal(t, uint64(5), statedb.GetNonce(userAccount))
require.Equal(t, big.NewInt(60), statedb.GetBalance(unknownAccount))
require.Equal(t, []byte{1}, statedb.GetCode(codeAccount))
}
func createGenesis() *core.Genesis {
l2Genesis := &core.Genesis{
Config: ¶ms.ChainConfig{},
Difficulty: common.Big0,
ParentHash: common.Hash{},
BaseFee: big.NewInt(7),
Alloc: map[common.Address]core.GenesisAccount{
userAccount: {
Balance: big.NewInt(1_000_000_000_000_000_000),
Nonce: 10,
},
codeAccount: {
Balance: big.NewInt(100),
Code: []byte{5, 7, 8, 3, 4},
Storage: map[common.Hash]common.Hash{
common.HexToHash("0x01"): common.HexToHash("0x11"),
common.HexToHash("0x02"): common.HexToHash("0x12"),
common.HexToHash("0x03"): common.HexToHash("0x13"),
},
},
},
}
return l2Genesis
}
func assertStateDataAvailable(t *testing.T, db ethdb.KeyValueStore, l2Genesis *core.Genesis, genesisBlock *types.Block) {
statedb, err := state.New(genesisBlock.Root(), state.NewDatabase(rawdb.NewDatabase(db)), nil)
require.NoError(t, err)
for address, account := range l2Genesis.Alloc {
require.Equal(t, account.Balance, statedb.GetBalance(address))
require.Equal(t, account.Nonce, statedb.GetNonce(address))
require.Equal(t, common.BytesToHash(crypto.Keccak256(account.Code)), statedb.GetCodeHash(address))
require.Equal(t, account.Code, statedb.GetCode(address))
for key, value := range account.Storage {
require.Equal(t, value, statedb.GetState(address, key))
}
}
require.Equal(t, common.Hash{}, statedb.GetState(codeAccount, common.HexToHash("0x99")), "retrieve unset storage key")
require.Equal(t, common.Big0, statedb.GetBalance(unknownAccount), "unset account balance")
require.Equal(t, uint64(0), statedb.GetNonce(unknownAccount), "unset account balance")
require.Nil(t, statedb.GetCode(unknownAccount), "unset account code")
require.Equal(t, common.Hash{}, statedb.GetCodeHash(unknownAccount), "unset account code hash")
}
func newStubStateOracle() *stubStateOracle {
return &stubStateOracle{
data: make(map[common.Hash][]byte),
code: make(map[common.Hash][]byte),
}
}
type stubStateOracle struct {
data map[common.Hash][]byte
code map[common.Hash][]byte
}
func (o *stubStateOracle) NodeByHash(nodeHash common.Hash) ([]byte, error) {
data, ok := o.data[nodeHash]
if !ok {
return nil, fmt.Errorf("no value for node %v", nodeHash)
}
return data, nil
}
func (o *stubStateOracle) CodeByHash(hash common.Hash) ([]byte, error) {
data, ok := o.code[hash]
if !ok {
return nil, fmt.Errorf("no value for code %v", hash)
}
return data, nil
}
// kvStateOracle loads data from a source ethdb.KeyValueStore
type kvStateOracle struct {
source ethdb.KeyValueStore
}
func (o *kvStateOracle) NodeByHash(nodeHash common.Hash) ([]byte, error) {
return o.source.Get(nodeHash.Bytes())
}
func (o *kvStateOracle) CodeByHash(hash common.Hash) ([]byte, error) {
return rawdb.ReadCode(o.source, hash), nil
}