wards 的地址执行。如果您的地址不是 ward，就无法测试铸币操作。
通过状态覆盖将自己设置为 ward
为了模拟铸造 DAI 的交易，我们需要覆盖状态，使我们的地址显示为 ward。我们需要调整 DAI 合约中的wards 映射，以包含我们的地址及必要的权限。
要能够铸币，交易的发送方必须是 ward。换句话说，必须满足以下条件：wards['0xe2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2'] == 1。
在 API 请求中，将覆盖映射分配给 state_objects 对象。此映射指向智能合约中特定的存储位置，并为模拟分配新值。
- DAI 合约地址：
0x6b175474e89094c44da98b954eedeac495271d0f - 存储槽位置：
0xedd7d04419e9c48ceb6055956cbb4e2091ae310313a4d1fa7cbcfe7561616e03 - 覆盖值：
0x0000000000000000000000000000000000000000000000000000000000000001
example.json
{
"state_objects": {
"0x6b175474e89094c44da98b954eedeac495271d0f": {
"storage": {
"0xedd7d04419e9c48ceb6055956cbb4e2091ae310313a4d1fa7cbcfe7561616e03": "0x0000000000000000000000000000000000000000000000000000000000000001"
}
}
}
}
TENDERLY_ACCOUNT_SLUG 和 TENDERLY_ACCESS_KEY 设置为环境变量。了解如何获取 slug 和访问密钥。
- Request
- Response
example.ts
dotenv.config();
// assuming environment variables TENDERLY_ACCOUNT_SLUG, TENDERLY_PROJECT_SLUG and TENDERLY_ACCESS_KEY are set
// https://docs.tenderly.co/platform/account/projects/slug
// https://docs.tenderly.co/platform/account/projects/api-tokens
const { TENDERLY_ACCOUNT_SLUG, TENDERLY_PROJECT_SLUG, TENDERLY_ACCESS_KEY } = process.env;
const mintDai = async () => {
console.time('Simulation');
const fakeWardAddress = '0xe2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2';
// calculate the storage location of `wards[fakeWardAddress]`
// yields 0xedd7d04419e9c48ceb6055956cbb4e2091ae310313a4d1fa7cbcfe7561616e03
const overrideStorageLocation = ethers.utils.keccak256(
ethers.utils.concat([
ethers.utils.hexZeroPad(fakeWardAddress, 32), // the ward address (address 0x000..0) - mapping key
ethers.utils.hexZeroPad('0x0', 32), // the wards slot is 0th in the DAI contract - the mapping variable
]),
);
console.log('Storage Override Location', overrideStorageLocation);
const mint = (
await axios.post(
`https://api.tenderly.co/api/v1/account/${TENDERLY_ACCOUNT_SLUG}/project/${TENDERLY_PROJECT_SLUG}/simulate`,
// the transaction
{
save: true,
save_if_fails: true,
simulation_type: 'full',
network_id: '1',
from: '0xe2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2',
to: '0x6b175474e89094c44da98b954eedeac495271d0f',
input:
'0x40c10f19000000000000000000000000e58b9ee93700a616b50509c8292977fa7a0f8ce10000000000000000000000000000000000000000000000001bc16d674ec80000',
gas: 8000000,
state_objects: {
'0x6b175474e89094c44da98b954eedeac495271d0f': {
storage: {
'0xedd7d04419e9c48ceb6055956cbb4e2091ae310313a4d1fa7cbcfe7561616e03':
'0x0000000000000000000000000000000000000000000000000000000000000001',
},
},
},
},
{
headers: {
'X-Access-Key': TENDERLY_ACCESS_KEY as string,
},
},
)
).data;
console.timeEnd('Simulation');
console.log(JSON.stringify(mint, null, 2));
// TODO: extract token transferred
};
mintDai();
Storage Override Location 0xedd7d04419e9c48ceb6055956cbb4e2091ae310313a4d1fa7cbcfe7561616e03
Simulation: 185.029ms
{
"transaction": {
"hash": "0xd9d52b2cb6b6d8d8640bc2dee86050a623401fe39d7fbc4ab46ffd7ff3ea6ab6",
"block_hash": "",
"block_number": 16598541,
"from": "0xe2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2",
"gas": 8000000,
"gas_price": 0,
"gas_fee_cap": 0,
"gas_tip_cap": 0,
"cumulative_gas_used": 0,
"gas_used": 53465,
"effective_gas_price": 0,
"input": "0x40c10f19000000000000000000000000e58b9ee93700a616b50509c8292977fa7a0f8ce10000000000000000000000000000000000000000000000001bc16d674ec80000",
"nonce": 0,
"to": "0x6b175474e89094c44da98b954eedeac495271d0f",
"index": 0,
"value": "0x",
"access_list": null,
"status": true,
"addresses": [
"0xe2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2",
"0x6b175474e89094c44da98b954eedeac495271d0f"
],
"contract_ids": [
"eth:1:0xe2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2",
"eth:1:0x6b175474e89094c44da98b954eedeac495271d0f"
],
"network_id": "1",
"timestamp": "2023-02-10T13:04:56Z",
"function_selector": "",
"l1_block_number": 0,
"l1_timestamp": 0,
"deposit_tx": false,
"system_tx": false,
"mint": null,
"sig": {
"v": "0x0",
"r": "0x0",
"s": "0x0"
},
"transaction_info": {
"contract_id": "eth:1:0x6b175474e89094c44da98b954eedeac495271d0f",
"block_number": 16598541,
"transaction_id": "0xd9d52b2cb6b6d8d8640bc2dee86050a623401fe39d7fbc4ab46ffd7ff3ea6ab6",
"contract_address": "0x6b175474e89094c44da98b954eedeac495271d0f",
"method": "mint",
"parameters": null,
"intrinsic_gas": 21620,
"refund_gas": 0,
"call_trace": {
"hash": "0xd9d52b2cb6b6d8d8640bc2dee86050a623401fe39d7fbc4ab46ffd7ff3ea6ab6",
"contract_name": "Dai",
"function_name": "mint",
"function_pc": 3948,
"function_op": "JUMPDEST",
"function_file_index": 0,
"function_code_start": 5501,
"function_line_number": 134,
"function_code_length": 202,
"absolute_position": 88,
"caller_pc": 0,
"caller_op": "CALL",
"call_type": "CALL",
"from": "0xe2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2",
"from_balance": "0",
"to": "0x6b175474e89094c44da98b954eedeac495271d0f",
"to_balance": "0",
"value": "0",
"caller": {
"address": "0xe2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2",
"balance": "0"
},
"block_timestamp": "0001-01-01T00:00:00Z",
"gas": 7978380,
"gas_used": 31845,
"intrinsic_gas": 21620,
"input": "0x40c10f19000000000000000000000000e58b9ee93700a616b50509c8292977fa7a0f8ce10000000000000000000000000000000000000000000000001bc16d674ec80000",
"decoded_input": [
{
"soltype": {
"name": "usr",
"type": "address",
"storage_location": "default",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000000",
"indexed": false,
"simple_type": {
"type": "address"
}
},
"value": "0xe58b9ee93700a616b50509c8292977fa7a0f8ce1"
},
{
"soltype": {
"name": "wad",
"type": "uint256",
"storage_location": "default",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000000",
"indexed": false,
"simple_type": {
"type": "uint"
}
},
"value": "2000000000000000000"
}
],
"nonce_diff": [
{
"address": "0xe2E2E2e2e2e2E2E2E2E2e2E2e2E2E2e2e2e2E2e2",
"original": "0",
"dirty": "1"
}
],
"state_diff": [
{
"address": "0x6b175474e89094c44da98b954eedeac495271d0f",
"soltype": {
"name": "totalSupply",
"type": "uint256",
"storage_location": "storage",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000001",
"indexed": false,
"simple_type": {
"type": "uint"
}
},
"original": "5090814826520179690761462859",
"dirty": "5090814828520179690761462859",
"raw": [
{
"address": "0x6b175474e89094c44da98b954eedeac495271d0f",
"key": "0x0000000000000000000000000000000000000000000000000000000000000001",
"original": "0x0000000000000000000000000000000000000000107305f8bb52a43b529da44b",
"dirty": "0x0000000000000000000000000000000000000000107305f8d71411a2a165a44b"
}
]
},
{
"address": "0x6b175474e89094c44da98b954eedeac495271d0f",
"soltype": {
"name": "balanceOf",
"type": "mapping (address => uint256)",
"storage_location": "storage",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000002",
"indexed": false
},
"original": {
"0xe58b9ee93700a616b50509c8292977fa7a0f8ce1": "0"
},
"dirty": {
"0xe58b9ee93700a616b50509c8292977fa7a0f8ce1": "2000000000000000000"
},
"raw": [
{
"address": "0x6b175474e89094c44da98b954eedeac495271d0f",
"key": "0x9b5472766fd311751f6a33c8e30061e20a26259ca626cf5a2feaadf96903cd9e",
"original": "0x0000000000000000000000000000000000000000000000000000000000000000",
"dirty": "0x0000000000000000000000000000000000000000000000001bc16d674ec80000"
}
]
}
],
"logs": [
{
"name": "Transfer",
"anonymous": false,
"inputs": [
{
"soltype": {
"name": "src",
"type": "address",
"storage_location": "default",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000000",
"indexed": true,
"simple_type": {
"type": "address"
}
},
"value": "0x0000000000000000000000000000000000000000"
},
{
"soltype": {
"name": "dst",
"type": "address",
"storage_location": "default",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000000",
"indexed": true,
"simple_type": {
"type": "address"
}
},
"value": "0xe58b9ee93700a616b50509c8292977fa7a0f8ce1"
},
{
"soltype": {
"name": "wad",
"type": "uint256",
"storage_location": "default",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000000",
"indexed": false,
"simple_type": {
"type": "uint"
}
},
"value": "2000000000000000000"
}
],
"raw": {
"address": "0x6b175474e89094c44da98b954eedeac495271d0f",
"topics": [
"0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
"0x0000000000000000000000000000000000000000000000000000000000000000",
"0x000000000000000000000000e58b9ee93700a616b50509c8292977fa7a0f8ce1"
],
"data": "0x0000000000000000000000000000000000000000000000001bc16d674ec80000"
}
}
],
"output": "0x",
"decoded_output": null,
"network_id": "1",
"calls": [
{
"hash": "",
"contract_name": "Dai",
"function_name": "add",
"function_pc": 7825,
"function_op": "JUMPDEST",
"function_file_index": 0,
"function_code_start": 3853,
"function_line_number": 94,
"function_code_length": 102,
"absolute_position": 136,
"caller_pc": 4200,
"caller_op": "JUMP",
"caller_file_index": 0,
"caller_line_number": 135,
"caller_code_start": 5579,
"caller_code_length": 24,
"call_type": "JUMPDEST",
"from": "0x6b175474e89094c44da98b954eedeac495271d0f",
"from_balance": null,
"to": "0x6b175474e89094c44da98b954eedeac495271d0f",
"to_balance": null,
"value": null,
"caller": {
"address": "0xe2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2",
"balance": "0"
},
"block_timestamp": "0001-01-01T00:00:00Z",
"gas": 7973640,
"gas_used": 62,
"input": "0x",
"decoded_input": [
{
"soltype": {
"name": "x",
"type": "uint256",
"storage_location": "default",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000000",
"indexed": false,
"simple_type": {
"type": "uint"
}
},
"value": "0"
},
{
"soltype": {
"name": "y",
"type": "uint256",
"storage_location": "default",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000000",
"indexed": false,
"simple_type": {
"type": "uint"
}
},
"value": "2000000000000000000"
}
],
"output": "0x",
"decoded_output": [
{
"soltype": {
"name": "z",
"type": "uint256",
"storage_location": "default",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000000",
"indexed": false,
"simple_type": {
"type": "uint"
}
},
"value": "2000000000000000000"
}
],
"network_id": "",
"calls": null
},
{
"hash": "",
"contract_name": "Dai",
"function_name": "add",
"function_pc": 7825,
"function_op": "JUMPDEST",
"function_file_index": 0,
"function_code_start": 3853,
"function_line_number": 94,
"function_code_length": 102,
"absolute_position": 184,
"caller_pc": 4279,
"caller_op": "JUMP",
"caller_file_index": 0,
"caller_line_number": 136,
"caller_code_start": 5630,
"caller_code_length": 21,
"call_type": "JUMPDEST",
"from": "0x6b175474e89094c44da98b954eedeac495271d0f",
"from_balance": null,
"to": "0x6b175474e89094c44da98b954eedeac495271d0f",
"to_balance": null,
"value": null,
"caller": {
"address": "0xe2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2",
"balance": "0"
},
"block_timestamp": "0001-01-01T00:00:00Z",
"gas": 7951356,
"gas_used": 62,
"input": "0x",
"decoded_input": [
{
"soltype": {
"name": "x",
"type": "uint256",
"storage_location": "default",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000000",
"indexed": false,
"simple_type": {
"type": "uint"
}
},
"value": "5090814826520179690761462859"
},
{
"soltype": {
"name": "y",
"type": "uint256",
"storage_location": "default",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000000",
"indexed": false,
"simple_type": {
"type": "uint"
}
},
"value": "2000000000000000000"
}
],
"output": "0x",
"decoded_output": [
{
"soltype": {
"name": "z",
"type": "uint256",
"storage_location": "default",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000000",
"indexed": false,
"simple_type": {
"type": "uint"
}
},
"value": "5090814828520179690761462859"
}
],
"network_id": "",
"calls": null
}
]
},
"stack_trace": null,
"logs": [
{
"name": "Transfer",
"anonymous": false,
"inputs": [
{
"soltype": {
"name": "src",
"type": "address",
"storage_location": "default",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000000",
"indexed": true,
"simple_type": {
"type": "address"
}
},
"value": "0x0000000000000000000000000000000000000000"
},
{
"soltype": {
"name": "dst",
"type": "address",
"storage_location": "default",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000000",
"indexed": true,
"simple_type": {
"type": "address"
}
},
"value": "0xe58b9ee93700a616b50509c8292977fa7a0f8ce1"
},
{
"soltype": {
"name": "wad",
"type": "uint256",
"storage_location": "default",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000000",
"indexed": false,
"simple_type": {
"type": "uint"
}
},
"value": "2000000000000000000"
}
],
"raw": {
"address": "0x6b175474e89094c44da98b954eedeac495271d0f",
"topics": [
"0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
"0x0000000000000000000000000000000000000000000000000000000000000000",
"0x000000000000000000000000e58b9ee93700a616b50509c8292977fa7a0f8ce1"
],
"data": "0x0000000000000000000000000000000000000000000000001bc16d674ec80000"
}
}
],
"balance_diff": null,
"nonce_diff": [
{
"address": "0xe2E2E2e2e2e2E2E2E2E2e2E2e2E2E2e2e2e2E2e2",
"original": "0",
"dirty": "1"
}
],
"state_diff": [
{
"address": "0x6b175474e89094c44da98b954eedeac495271d0f",
"soltype": {
"name": "totalSupply",
"type": "uint256",
"storage_location": "storage",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000001",
"indexed": false,
"simple_type": {
"type": "uint"
}
},
"original": "5090814826520179690761462859",
"dirty": "5090814828520179690761462859",
"raw": [
{
"address": "0x6b175474e89094c44da98b954eedeac495271d0f",
"key": "0x0000000000000000000000000000000000000000000000000000000000000001",
"original": "0x0000000000000000000000000000000000000000107305f8bb52a43b529da44b",
"dirty": "0x0000000000000000000000000000000000000000107305f8d71411a2a165a44b"
}
]
},
{
"address": "0x6b175474e89094c44da98b954eedeac495271d0f",
"soltype": {
"name": "balanceOf",
"type": "mapping (address => uint256)",
"storage_location": "storage",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000002",
"indexed": false
},
"original": {
"0xe58b9ee93700a616b50509c8292977fa7a0f8ce1": "0"
},
"dirty": {
"0xe58b9ee93700a616b50509c8292977fa7a0f8ce1": "2000000000000000000"
},
"raw": [
{
"address": "0x6b175474e89094c44da98b954eedeac495271d0f",
"key": "0x9b5472766fd311751f6a33c8e30061e20a26259ca626cf5a2feaadf96903cd9e",
"original": "0x0000000000000000000000000000000000000000000000000000000000000000",
"dirty": "0x0000000000000000000000000000000000000000000000001bc16d674ec80000"
}
]
}
],
"raw_state_diff": null,
"console_logs": null,
"created_at": "2023-02-10T13:04:56Z"
},
"method": "",
"decoded_input": null,
"call_trace": [
{
"call_type": "CALL",
"from": "0xe2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2",
"to": "0x6b175474e89094c44da98b954eedeac495271d0f",
"gas": 7978380,
"gas_used": 31845,
"type": "CALL",
"input": "0x40c10f19000000000000000000000000e58b9ee93700a616b50509c8292977fa7a0f8ce10000000000000000000000000000000000000000000000001bc16d674ec80000"
}
]
},
"simulation": {
"id": "46cb1f92-c9ee-4ef2-8736-6dc6ae84f8d8",
"project_id": "11686306-12f4-4c48-9396-c07dbe6b3c51",
"owner_id": "796e7d91-d8a2-4137-af6c-361f34e79557",
"network_id": "1",
"block_number": 16598541,
"transaction_index": 0,
"from": "0xe2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2",
"to": "0x6b175474e89094c44da98b954eedeac495271d0f",
"input": "0x40c10f19000000000000000000000000e58b9ee93700a616b50509c8292977fa7a0f8ce10000000000000000000000000000000000000000000000001bc16d674ec80000",
"gas": 8000000,
"gas_price": "0",
"gas_used": 53465,
"value": "0",
"method": "mint",
"status": true,
"access_list": null,
"queue_origin": "",
"block_header": {
"number": "0xfd460d",
"hash": "0x0000000000000000000000000000000000000000000000000000000000000000",
"stateRoot": "0x0000000000000000000000000000000000000000000000000000000000000000",
"parentHash": "0x033362dcc958b7c9628256b1a59d7a82c2a7205fc7cb7c3270d08aef8e760e52",
"sha3Uncles": "0x0000000000000000000000000000000000000000000000000000000000000000",
"transactionsRoot": "0x0000000000000000000000000000000000000000000000000000000000000000",
"receiptsRoot": "0x0000000000000000000000000000000000000000000000000000000000000000",
"logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
"timestamp": "0x63e640f8",
"difficulty": "0x0",
"gasLimit": "0x1c9c380",
"gasUsed": "0xed3d6a",
"miner": "0x0000000000000000000000000000000000000000",
"extraData": "0x",
"mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
"nonce": "0x0000000000000000",
"baseFeePerGas": "0x1",
"size": "0x0",
"totalDifficulty": "0x0",
"uncles": null,
"transactions": null
},
"state_overrides": {
"0x6b175474e89094c44da98b954eedeac495271d0f": {
"storage": {
"0xedd7d04419e9c48ceb6055956cbb4e2091ae310313a4d1fa7cbcfe7561616e03": "0x0000000000000000000000000000000000000000000000000000000000000001"
}
}
},
"mint": null,
"deposit_tx": false,
"system_tx": false,
"nonce": 0,
"addresses": [
"0xe2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2",
"0x6b175474e89094c44da98b954eedeac495271d0f"
],
"contract_ids": [
"eth:1:0xe2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2",
"eth:1:0x6b175474e89094c44da98b954eedeac495271d0f"
],
"created_at": "2023-02-10T13:04:57.004109816Z"
},
"contracts": [
{
"id": "eth:1:0x6b175474e89094c44da98b954eedeac495271d0f",
"contract_id": "eth:1:0x6b175474e89094c44da98b954eedeac495271d0f",
"balance": "",
"network_id": "1",
"public": true,
"export": false,
"verified_by": "etherscan",
"verification_date": null,
"address": "0x6b175474e89094c44da98b954eedeac495271d0f",
"contract_name": "Dai",
"ens_domain": null,
"type": "contract",
"standard": "erc20",
"standards": [
"erc20"
],
"token_data": {
"symbol": "DAI",
"name": "Dai Stablecoin",
"decimals": 18,
"main": true
},
"evm_version": "default",
"compiler_version": "v0.5.12+commit.7709ece9",
"optimizations_used": false,
"optimization_runs": 200,
"libraries": null,
"data": {
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"contract_info": [
{
"id": 0,
"path": "Dai.sol",
"name": "Dai.sol",
"source": "// hevm: flattened sources of /nix/store/8xb41r4qd0cjb63wcrxf1qmfg88p0961-dss-6fd7de0/src/dai.sol\npragma solidity =0.5.12;\n\n////// /nix/store/8xb41r4qd0cjb63wcrxf1qmfg88p0961-dss-6fd7de0/src/lib.sol\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU General Public License for more details.\n\n// You should have received a copy of the GNU General Public License\n// along with this program. If not, see <http://www.gnu.org/licenses/>.\n\n/* pragma solidity 0.5.12; */\n\ncontract LibNote {\n event LogNote(\n bytes4 indexed sig,\n address indexed usr,\n bytes32 indexed arg1,\n bytes32 indexed arg2,\n bytes data\n ) anonymous;\n\n modifier note {\n _;\n assembly {\n // log an 'anonymous' event with a constant 6 words of calldata\n // and four indexed topics: selector, caller, arg1 and arg2\n let mark := msize // end of memory ensures zero\n mstore(0x40, add(mark, 288)) // update free memory pointer\n mstore(mark, 0x20) // bytes type data offset\n mstore(add(mark, 0x20), 224) // bytes size (padded)\n calldatacopy(add(mark, 0x40), 0, 224) // bytes payload\n log4(mark, 288, // calldata\n shl(224, shr(224, calldataload(0))), // msg.sig\n caller, // msg.sender\n calldataload(4), // arg1\n calldataload(36) // arg2\n )\n }\n }\n}\n\n////// /nix/store/8xb41r4qd0cjb63wcrxf1qmfg88p0961-dss-6fd7de0/src/dai.sol\n// Copyright (C) 2017, 2018, 2019 dbrock, rain, mrchico\n\n// This program is free software: you can redistribute it and/or modify\n// it under the terms of the GNU Affero General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n//\n// This program is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the\n// GNU Affero General Public License for more details.\n//\n// You should have received a copy of the GNU Affero General Public License\n// along with this program. If not, see <https://www.gnu.org/licenses/>.\n\n/* pragma solidity 0.5.12; */\n\n/* import \"./lib.sol\"; */\n\ncontract Dai is LibNote {\n // --- Auth ---\n mapping (address => uint) public wards;\n function rely(address guy) external note auth { wards[guy] = 1; }\n function deny(address guy) external note auth { wards[guy] = 0; }\n modifier auth {\n require(wards[msg.sender] == 1, \"Dai/not-authorized\");\n _;\n }\n\n // --- ERC20 Data ---\n string public constant name = \"Dai Stablecoin\";\n string public constant symbol = \"DAI\";\n string public constant version = \"1\";\n uint8 public constant decimals = 18;\n uint256 public totalSupply;\n\n mapping (address => uint) public balanceOf;\n mapping (address => mapping (address => uint)) public allowance;\n mapping (address => uint) public nonces;\n\n event Approval(address indexed src, address indexed guy, uint wad);\n event Transfer(address indexed src, address indexed dst, uint wad);\n\n // --- Math ---\n function add(uint x, uint y) internal pure returns (uint z) {\n require((z = x + y) >= x);\n }\n function sub(uint x, uint y) internal pure returns (uint z) {\n require((z = x - y) <= x);\n }\n\n // --- EIP712 niceties ---\n bytes32 public DOMAIN_SEPARATOR;\n // bytes32 public constant PERMIT_TYPEHASH = keccak256(\"Permit(address holder,address spender,uint256 nonce,uint256 expiry,bool allowed)\");\n bytes32 public constant PERMIT_TYPEHASH = 0xea2aa0a1be11a07ed86d755c93467f4f82362b452371d1ba94d1715123511acb;\n\n constructor(uint256 chainId_) public {\n wards[msg.sender] = 1;\n DOMAIN_SEPARATOR = keccak256(abi.encode(\n keccak256(\"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)\"),\n keccak256(bytes(name)),\n keccak256(bytes(version)),\n chainId_,\n address(this)\n ));\n }\n\n // --- Token ---\n function transfer(address dst, uint wad) external returns (bool) {\n return transferFrom(msg.sender, dst, wad);\n }\n function transferFrom(address src, address dst, uint wad)\n public returns (bool)\n {\n require(balanceOf[src] >= wad, \"Dai/insufficient-balance\");\n if (src != msg.sender && allowance[src][msg.sender] != uint(-1)) {\n require(allowance[src][msg.sender] >= wad, \"Dai/insufficient-allowance\");\n allowance[src][msg.sender] = sub(allowance[src][msg.sender], wad);\n }\n balanceOf[src] = sub(balanceOf[src], wad);\n balanceOf[dst] = add(balanceOf[dst], wad);\n emit Transfer(src, dst, wad);\n return true;\n }\n function mint(address usr, uint wad) external auth {\n balanceOf[usr] = add(balanceOf[usr], wad);\n totalSupply = add(totalSupply, wad);\n emit Transfer(address(0), usr, wad);\n }\n function burn(address usr, uint wad) external {\n require(balanceOf[usr] >= wad, \"Dai/insufficient-balance\");\n if (usr != msg.sender && allowance[usr][msg.sender] != uint(-1)) {\n require(allowance[usr][msg.sender] >= wad, \"Dai/insufficient-allowance\");\n allowance[usr][msg.sender] = sub(allowance[usr][msg.sender], wad);\n }\n balanceOf[usr] = sub(balanceOf[usr], wad);\n totalSupply = sub(totalSupply, wad);\n emit Transfer(usr, address(0), wad);\n }\n function approve(address usr, uint wad) external returns (bool) {\n allowance[msg.sender][usr] = wad;\n emit Approval(msg.sender, usr, wad);\n return true;\n }\n\n // --- Alias ---\n function push(address usr, uint wad) external {\n transferFrom(msg.sender, usr, wad);\n }\n function pull(address usr, uint wad) external {\n transferFrom(usr, msg.sender, wad);\n }\n function move(address src, address dst, uint wad) external {\n transferFrom(src, dst, wad);\n }\n\n // --- Approve by signature ---\n function permit(address holder, address spender, uint256 nonce, uint256 expiry,\n bool allowed, uint8 v, bytes32 r, bytes32 s) external\n {\n bytes32 digest =\n keccak256(abi.encodePacked(\n \"\\x19\\x01\",\n DOMAIN_SEPARATOR,\n keccak256(abi.encode(PERMIT_TYPEHASH,\n holder,\n spender,\n nonce,\n expiry,\n allowed))\n ));\n\n require(holder != address(0), \"Dai/invalid-address-0\");\n require(holder == ecrecover(digest, v, r, s), \"Dai/invalid-permit\");\n require(expiry == 0 || now <= expiry, \"Dai/permit-expired\");\n require(nonce == nonces[holder]++, \"Dai/invalid-nonce\");\n uint wad = allowed ? uint(-1) : 0;\n allowance[holder][spender] = wad;\n emit Approval(holder, spender, wad);\n }\n}"
}
],
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{
"type": "constructor",
"name": "",
"constant": false,
"anonymous": false,
"stateMutability": "",
"inputs": [
{
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"indexed": false,
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}
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},
{
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"constant": true,
"anonymous": false,
"stateMutability": "view",
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"outputs": [
{
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}
]
},
{
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"inputs": [
{
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}
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{
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{
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{
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{
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}
],
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{
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{
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{
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{
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}
],
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}
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},
{
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{
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}
],
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},
{
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{
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}
],
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{
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{
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{
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}
],
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{
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}
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}
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},
{
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}
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},
{
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{
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},
{
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}
],
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}
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{
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"stateMutability": "view",
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{
"name": "",
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}
],
"outputs": [
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}
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},
{
"type": "function",
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{
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}
]
},
{
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{
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}
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{
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},
{
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}
],
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{
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},
{
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}
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},
{
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{
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},
{
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{
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{
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{
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},
{
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}
],
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{
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{
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"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000000",
"indexed": false,
"simple_type": {
"type": "address"
}
}
],
"outputs": []
},
{
"type": "event",
"name": "Approval",
"constant": false,
"anonymous": false,
"stateMutability": "",
"inputs": [
{
"name": "src",
"type": "address",
"storage_location": "default",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000000",
"indexed": true,
"simple_type": {
"type": "address"
}
},
{
"name": "guy",
"type": "address",
"storage_location": "default",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000000",
"indexed": true,
"simple_type": {
"type": "address"
}
},
{
"name": "wad",
"type": "uint256",
"storage_location": "default",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000000",
"indexed": false,
"simple_type": {
"type": "uint"
}
}
],
"outputs": null
},
{
"type": "event",
"name": "LogNote",
"constant": false,
"anonymous": true,
"stateMutability": "",
"inputs": [
{
"name": "sig",
"type": "bytes4",
"storage_location": "default",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000000",
"indexed": true,
"simple_type": {
"type": "bytes"
}
},
{
"name": "usr",
"type": "address",
"storage_location": "default",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000000",
"indexed": true,
"simple_type": {
"type": "address"
}
},
{
"name": "arg1",
"type": "bytes32",
"storage_location": "default",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000000",
"indexed": true,
"simple_type": {
"type": "bytes"
}
},
{
"name": "arg2",
"type": "bytes32",
"storage_location": "default",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000000",
"indexed": true,
"simple_type": {
"type": "bytes"
}
},
{
"name": "data",
"type": "bytes",
"storage_location": "default",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000000",
"indexed": false,
"simple_type": {
"type": "bytes"
}
}
],
"outputs": null
},
{
"type": "event",
"name": "Transfer",
"constant": false,
"anonymous": false,
"stateMutability": "",
"inputs": [
{
"name": "src",
"type": "address",
"storage_location": "default",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000000",
"indexed": true,
"simple_type": {
"type": "address"
}
},
{
"name": "dst",
"type": "address",
"storage_location": "default",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000000",
"indexed": true,
"simple_type": {
"type": "address"
}
},
{
"name": "wad",
"type": "uint256",
"storage_location": "default",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000000",
"indexed": false,
"simple_type": {
"type": "uint"
}
}
],
"outputs": null
}
],
"raw_abi": null,
"states": [
{
"name": "DOMAIN_SEPARATOR",
"type": "bytes32",
"storage_location": "storage",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000005",
"indexed": false,
"simple_type": {
"type": "bytes"
}
},
{
"name": "wards",
"type": "mapping (address => uint256)",
"storage_location": "storage",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000000",
"indexed": false
},
{
"name": "totalSupply",
"type": "uint256",
"storage_location": "storage",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000001",
"indexed": false,
"simple_type": {
"type": "uint"
}
},
{
"name": "balanceOf",
"type": "mapping (address => uint256)",
"storage_location": "storage",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000002",
"indexed": false
},
{
"name": "allowance",
"type": "mapping (address => mapping (address => uint256))",
"storage_location": "storage",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000003",
"indexed": false
},
{
"name": "nonces",
"type": "mapping (address => uint256)",
"storage_location": "storage",
"components": null,
"offset": 0,
"index": "0x0000000000000000000000000000000000000000000000000000000000000004",
"indexed": false
}
]
},
"creation_block": 0,
"creation_tx": "",
"creator_address": "",
"created_at": "2022-12-16T09:10:37Z",
"number_of_watches": null,
"language": "solidity",
"in_project": false,
"number_of_files": 1
}
],
"generated_access_list": []
}
存储槽计算
设置覆盖的关键部分是计算正确的存储位置。这取决于合约存储的结构以及您要覆盖的具体变量。 对于 DAI 合约，我们地址对应的wards 映射的存储位置根据 Solidity 存储布局规则计算，由以下表达式给出：
example.js
const fakeWardAddress = '0xe2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2e2';
const overrideStorageLocation = keccak256(
concatenate(
hexZeroPad(fakeWardAddress), hexZeroPad(0x0)
)
)
0xedd7d04419e9c48ceb6055956cbb4e2091ae310313a4d1fa7cbcfe7561616e03。