姑苏城外一茅屋，万树梅花月满天

0%

solidity | 结果返回与获取

发表于 更新于 分类于 ， ， ， ， Valine：

返回结果主要有两类

  • 需要 gas 返回
  • 不需要 gas 返回
  • 异常返回
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
pragma solidity ^0.8.0;

contract ERC20{

    string public name;
    error testError(string msg);

    function test1() public view returns(uint256){
        return 1;
    }

    function test2() public view returns(uint256,bool){
        return (1,true);
    }

    function test3() public view returns(uint256){
        require(1>2,"1>2 error");
        return 1;
    }

    function test4() public view returns(uint256){
        assert(1>2);
        return 1;
    }

    function test5() public view returns(uint256){
        if(1 < 2){
            revert testError("test5 error");
        }
        return 1;
    }

    function test6() public returns(uint256){
        name = "test6";
        return 1;
    }

    function test7() public returns(uint256){
        if(1 < 2){
            name = "test7";
            revert testError("test5 error");
        }
        return 1;
    }

    function test8() public returns(uint256){
        require(1>2,"test7 error");
        return 1;
    }

}

将这个合约部署到 bsc 测试网。

相关代码

无需 gas

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
from web3 import Web3
import traceback

abi = """[{"inputs":[],"name":"test6","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"test7","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"msg","type":"string"}],"name":"testError","type":"error"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"test1","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"test2","outputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"test3","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"test4","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"test5","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]"""
w3 = Web3(Web3.HTTPProvider("https://bsc.getblock.io/testnet/?api_key=5de***d"))

contract = "0xf9E70F3d6dcC64D25f557e06becC6760bF0245D2"

contract_ = w3.eth.contract(
    address=Web3.toChecksumAddress(contract), abi=abi)

print(contract_.functions.test1().call())
print(contract_.functions.test2().call())


def test():
    try:
        print(contract_.functions.test3().call())
    except Exception as e:
        print(traceback.format_exc())

    try:
        print(contract_.functions.test4().call())
    except Exception as e:
        print(traceback.format_exc())

    try:
        print(contract_.functions.test5().call())
    except Exception as e:
        print(traceback.format_exc())


if __name__ == '__main__':
    test()

分别输出

1
2
3
4
5
6
7
8
9
10
11
12
13
1
[1, True]
Traceback (most recent call last):
  ...
web3.exceptions.ContractLogicError: execution reverted: 1>2 error

Traceback (most recent call last):
  ...
web3.exceptions.ContractLogicError: execution reverted

Traceback (most recent call last):
  ...
web3.exceptions.ContractLogicError: execution reverted

可以看出只有 require 才会返回错误信息。当然，也有可能是因为 bsc 阉割问题，导致不返回信息。

需要 gas

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
from web3 import Web3

abi = """[{"inputs":[],"name":"test6","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"test7","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"test8","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"string","name":"msg","type":"string"}],"name":"testError","type":"error"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"test1","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"test2","outputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"test3","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"test4","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"test5","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]"""

w3 = Web3(Web3.HTTPProvider("https://bsc.getblock.io/testnet/?api_key=5deb2510-62f9-40a9-b0e0-0039f9025ded"))

address = "0xD1B260aba3bA6f3D3099725b1b1C7cdD12581974"
contract = "0xf9E70F3d6dcC64D25f557e06becC6760bF0245D2"
private = ""

contract_ = w3.eth.contract(
    address=Web3.toChecksumAddress(contract), abi=abi)


def encode_test6():
    tx_dic = contract_.functions.test6(). \
        buildTransaction(
        {
            'gas': 500000,
        }
    )
    return tx_dic

def encode_test7():
    tx_dic = contract_.functions.test7(). \
        buildTransaction(
        {
            'gas': 500000,
        }
    )
    return tx_dic


def encode_test8():
    tx_dic = contract_.functions.test8(). \
        buildTransaction(
        {
            'gas': 500000,
        }
    )
    return tx_dic

def send_transaction(tx_dic):
    nonce = w3.eth.getTransactionCount(address)
    tx_dic["nonce"] = nonce
    tx_dic['gasPrice'] = w3.eth.gasPrice
    sign_tx = w3.eth.account.signTransaction(tx_dic, private_key=private)
    txn_hash = w3.eth.sendRawTransaction(sign_tx.rawTransaction)
    return Web3.toHex(txn_hash)


def get_wait_receipt(tx):
    data = w3.eth.waitForTransactionReceipt(tx)
    return data


if __name__ == '__main__':
    tx_dic = encode_test6()
    tx = send_transaction(tx_dic)
    data = get_wait_receipt(tx)
    print(data)
    tx_dic = encode_test7()
    tx = send_transaction(tx_dic)
    data = get_wait_receipt(tx)
    print(data)
    tx_dic = encode_test8()
    tx = send_transaction(tx_dic)
    data = get_wait_receipt(tx)
    print(data)

虽然 test6、test7、test8 有返回，但是，实际上是获取不到的，上面的 data 获取的是 logs 日志。

另外，关于一样

只有 require 才会在链上输出，但是，也有可能是 bsc 阉割问题。

请我喝杯咖啡吧～