web3.eth.abi¶

web3.eth.abi 를 사용하면 EVM (Ethereum Virtual Machine)에 대한 함수 호출을 위해 매개 변수를 ABI (Application Binary Interface)로 디코딩 및 인코딩 할 수 있습니다.

encodeFunctionSignature¶

web3.eth.abi.encodeFunctionSignature(functionName);

함수 이름과 함수 타입의 첫 4 바이트를 sha3를 통해 ABI 서명(ABI Signiture)로 인코딩합니다.¶

인자(Parameters)¶

1. functionName - String|Object: 인코딩 할 함수의 이름입니다 or the JSON interface object of the function. If string it has to be in the form function(type,type,...), e.g: myFunction(uint256,uint32[],bytes10,bytes)

반환값(Return)¶

String - 함수의 ABI 서명값

예제(Example)¶

// From a JSON interface object
web3.eth.abi.encodeFunctionSignature({
    name: 'myMethod',
    type: 'function',
    inputs: [{
        type: 'uint256',
        name: 'myNumber'
    },{
        type: 'string',
        name: 'myString'
    }]
})
> 0x24ee0097

// Or string
web3.eth.abi.encodeFunctionSignature('myMethod(uint256,string)')
> '0x24ee0097'

encodeEventSignature¶

web3.eth.abi.encodeEventSignature(eventName);

Encodes the event name to its ABI signature, which are the sha3 hash of the event name including input types.

1. eventName - String|Object: The event name to encode. or the JSON interface object of the event. If string it has to be in the form event(type,type,...), e.g: myEvent(uint256,uint32[],bytes10,bytes)

String - 이벤트의 ABI 서명.

web3.eth.abi.encodeEventSignature('myEvent(uint256,bytes32)')
> 0xf2eeb729e636a8cb783be044acf6b7b1e2c5863735b60d6daae84c366ee87d97

// json 인터페이스 오브젝트에서
web3.eth.abi.encodeEventSignature({
    name: 'myEvent',
    type: 'event',
    inputs: [{
        type: 'uint256',
        name: 'myNumber'
    },{
        type: 'bytes32',
        name: 'myBytes'
    }]
})
> 0xf2eeb729e636a8cb783be044acf6b7b1e2c5863735b60d6daae84c366ee87d97

encodeParameter¶

web3.eth.abi.encodeParameter(type, parameter);

유형에 따라 매개 변수를 ABI 표현으로 인코딩합니다.

type - String|Object: 매개 변수의 유형은 유형 목록은`solidity 문서 <http://solidity.readthedocs.io/en/develop/types.html>`_ 를 참조하십시오.
parameter - Mixed: 인코딩 할 실제 매개 변수입니다.

String - ABI 인코딩된 매개 변수입니다.

web3.eth.abi.encodeParameter('uint256', '2345675643');
> "0x000000000000000000000000000000000000000000000000000000008bd02b7b"

web3.eth.abi.encodeParameter('uint256', '2345675643');
> "0x000000000000000000000000000000000000000000000000000000008bd02b7b"

web3.eth.abi.encodeParameter('bytes32', '0xdf3234');
> "0xdf32340000000000000000000000000000000000000000000000000000000000"

web3.eth.abi.encodeParameter('bytes', '0xdf3234');
> "0x00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000003df32340000000000000000000000000000000000000000000000000000000000"

web3.eth.abi.encodeParameter('bytes32[]', ['0xdf3234', '0xfdfd']);
> "00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000002df32340000000000000000000000000000000000000000000000000000000000fdfd000000000000000000000000000000000000000000000000000000000000"

web3.eth.abi.encodeParameter(
    {
        "ParentStruct": {
            "propertyOne": 'uint256',
            "propertyTwo": 'uint256',
            "childStruct": {
                "propertyOne": 'uint256',
                "propertyTwo": 'uint256'
            }
        }
    },
    {
        "propertyOne": 42,
        "propertyTwo": 56,
        "childStruct": {
            "propertyOne": 45,
            "propertyTwo": 78
        }
    }
);
> "0x000000000000000000000000000000000000000000000000000000000000002a0000000000000000000000000000000000000000000000000000000000000038000000000000000000000000000000000000000000000000000000000000002d000000000000000000000000000000000000000000000000000000000000004e"

encodeParameters¶

web3.eth.abi.encodeParameters(typesArray, parameters);

JSON interface 오브젝트를 기반으로 함수 매개 변수를 인코딩합니다.¶

인자(Parameters)¶

typesArray - Array<String|Object>|Object: An array with types or a JSON interface of a function. See the solidity documentation for a list of types.
parameters - Array: 인코딩 할 매개 변수입니다.

반환값¶

String - ABI 인코딩 된 매개 변수.

예제¶

web3.eth.abi.encodeParameters(['uint256','string'], ['2345675643', 'Hello!%']);
> "0x000000000000000000000000000000000000000000000000000000008bd02b7b0000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000748656c6c6f212500000000000000000000000000000000000000000000000000"

web3.eth.abi.encodeParameters(['uint8[]','bytes32'], [['34','434'], '0x324567fff']);
> "0x0

web3.eth.abi.encodeParameters(
    [
        'uint8[]',
        {
            "ParentStruct": {
                "propertyOne": 'uint256',
                "propertyTwo": 'uint256',
                "ChildStruct": {
                    "propertyOne": 'uint256',
                    "propertyTwo": 'uint256'
                }
            }
        }
    ],
    [
        ['34','434'],
        {
            "propertyOne": '42',
            "propertyTwo": '56',
            "ChildStruct": {
                "propertyOne": '45',
                "propertyTwo": '78'
            }
        }
    ]
);
> "0x00000000000000000000000000000000000000000000000000000000000000a0000000000000000000000000000000000000000000000000000000000000002a0000000000000000000000000000000000000000000000000000000000000038000000000000000000000000000000000000000000000000000000000000002d000000000000000000000000000000000000000000000000000000000000004e0000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000002a0000000000000000000000000000000000000000000000000000000000000018"

encodeFunctionCall¶

web3.eth.abi.encodeFunctionCall(jsonInterface, parameters);

JSON interface 오브젝트 와 주어진 매개 변수를 사용하여 함수 호출을 인코딩합니다.¶

인자(Parameters)¶

jsonInterface - Object: The JSON interface object of a function.
parameters - Array: 인코딩 할 매개 변수입니다.

반환값¶

String - ABI 인코딩된 함수를 호출합니다. 이는 함수의 서명과 인자를 뜻합니다. [TODO] => The ABI encoded function call. Means function signature + parameters. ------- 예제 -------

web3.eth.abi.encodeFunctionCall({
    name: 'myMethod',
    type: 'function',
    inputs: [{
        type: 'uint256',
        name: 'myNumber'
    },{
        type: 'string',
        name: 'myString'
    }]
}, ['2345675643', 'Hello!%']);
> "0x24ee0097000000000000000000000000000000000000000000000000000000008bd02b7b0000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000000000000000000000000748656c6c6f212500000000000000000000000000000000000000000000000000"

decodeParameter¶

web3.eth.abi.decodeParameter(type, hexString);

ABI 인코딩 매개 변수를 JavaScript에서 사용 가능한 타입으로 디코딩합니다.

type - String|Object: The type of the parameter, see the solidity documentation for a list of types.
hexString - String: 디코딩 할 ABI 바이트 코드입니다.

Mixed - 디코딩 된 매개 변수.

web3.eth.abi.decodeParameter('uint256', '0x0000000000000000000000000000000000000000000000000000000000000010');
> "16"

web3.eth.abi.decodeParameter('string', '0x0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000848656c6c6f212521000000000000000000000000000000000000000000000000');
> "Hello!%!"

web3.eth.abi.decodeParameter('string', '0x0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000848656c6c6f212521000000000000000000000000000000000000000000000000');
> "Hello!%!"

web3.eth.abi.decodeParameter(
    {
        "ParentStruct": {
          "propertyOne": 'uint256',
          "propertyTwo": 'uint256',
          "childStruct": {
            "propertyOne": 'uint256',
            "propertyTwo": 'uint256'
          }
        }
    },

, '0x000000000000000000000000000000000000000000000000000000000000002a0000000000000000000000000000000000000000000000000000000000000038000000000000000000000000000000000000000000000000000000000000002d000000000000000000000000000000000000000000000000000000000000004e');
> {
    '0': {
        '0': '42',
        '1': '56',
        '2': {
            '0': '45',
            '1': '78',
            'propertyOne': '45',
            'propertyTwo': '78'
        },
        'childStruct': {
            '0': '45',
            '1': '78',
            'propertyOne': '45',
            'propertyTwo': '78'
        },
        'propertyOne': '42',
        'propertyTwo': '56'
    },
    'ParentStruct': {
        '0': '42',
        '1': '56',
        '2': {
            '0': '45',
            '1': '78',
            'propertyOne': '45',
            'propertyTwo': '78'
        },
        'childStruct': {
            '0': '45',
            '1': '78',
            'propertyOne': '45',
            'propertyTwo': '78'
        },
        'propertyOne': '42',
        'propertyTwo': '56'
    }
}

decodeParameters¶

web3.eth.abi.decodeParameters(typesArray, hexString);

ABI 인코딩 매개 변수를 JavaScript에서 사용 가능한 타입으로 디코딩합니다.¶

인자(Parameters)¶

typesArray - Array<String|Object>|Object: An array with types or a JSON interface outputs array. See the solidity documentation for a list of types.
hexString - String: 디코딩 할 ABI 바이트 코드입니다.

반환값¶

Object - 디코딩 된 매개 변수를 포함하는 결과 오브젝트입니다.

예제¶

web3.eth.abi.decodeParameters(['string', 'uint256'], '0x000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000ea000000000000000000000000000000000000000000000000000000000000000848656c6c6f212521000000000000000000000000000000000000000000000000');
> Result { '0': 'Hello!%!', '1': '234' }

web3.eth.abi.decodeParameters([{
    type: 'string',
    name: 'myString'
},{
    type: 'uint256',
    name: 'myNumber'
}], '0x000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000000000000000000000000000000000ea000000000000000000000000000000000000000000000000000000000000000848656c6c6f212521000000000000000000000000000000000000000000000000');
> Result {
    '0': 'Hello!%!',
    '1': '234',
    myString: 'Hello!%!',
    myNumber: '234'
}

web3.eth.abi.decodeParameters([
  'uint8[]',
  {
    "ParentStruct": {
      "propertyOne": 'uint256',
      "propertyTwo": 'uint256',
      "childStruct": {
        "propertyOne": 'uint256',
        "propertyTwo": 'uint256'
      }
    }
  }
], '0x00000000000000000000000000000000000000000000000000000000000000a0000000000000000000000000000000000000000000000000000000000000002a0000000000000000000000000000000000000000000000000000000000000038000000000000000000000000000000000000000000000000000000000000002d000000000000000000000000000000000000000000000000000000000000004e0000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000002a0000000000000000000000000000000000000000000000000000000000000018');
> Result {
    '0': ['42', '24'],
    '1': {
        '0': '42',
        '1': '56',
        '2':
            {
                '0': '45',
                '1': '78',
                'propertyOne': '45',
                'propertyTwo': '78'
            },
        'childStruct':
            {
                '0': '45',
                '1': '78',
                'propertyOne': '45',
                'propertyTwo': '78'
            },
        'propertyOne': '42',
        'propertyTwo': '56'
    }
}

decodeLog¶

web3.eth.abi.decodeLog(inputs, hexString, topics);

ABI 인코딩 된 로그 데이터 및 인덱싱 된 토픽 데이터를 디코딩합니다.

inputs - Object: A JSON interface inputs array. See the solidity documentation for a list of types.
hexString - String: The ABI byte code in the data field of a log.
topics - Array: An array with the index parameter topics of the log, without the topic[0] if its a non-anonymous event, otherwise with topic[0].

Object - 디코딩 된 매개 변수를 포함하는 결과 오브젝트 입니다.

web3.eth.abi.decodeLog([{
    type: 'string',
    name: 'myString'
},{
    type: 'uint256',
    name: 'myNumber',
    indexed: true
},{
    type: 'uint8',
    name: 'mySmallNumber',
    indexed: true
}],
'0x0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000748656c6c6f252100000000000000000000000000000000000000000000000000',
['0x000000000000000000000000000000000000000000000000000000000000f310', '0x0000000000000000000000000000000000000000000000000000000000000010']);
> Result {
    '0': 'Hello%!',
    '1': '62224',
    '2': '16',
    myString: 'Hello%!',
    myNumber: '62224',
    mySmallNumber: '16'
}