Solidity Call, Fallback, Receive Ex

 

call로 다른 주소에 Ether를 송금 가능.

call로 외부 contract에 함수를 호출 가능.

 

코드

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 < 0.9.0;

contract ContractReceiver {
	event EvtFallback(string _str);
	event EvtReceive(string _str);
	function fun1(uint256 _v1, uint256 _v2) public pure returns(uint256){
		return _v1 + _v2;
	}
	fallback() external {
		emit EvtFallback("ContractReciver1.EvtFallback is called");
	}
	receive() external payable {
		emit EvtReceive("ContractReciver1.EvtReceive is called");
	}

}

contract ContractCaller {
	event EvtCalledFunction(bool _success, bytes _output);

	//function transferEther(address payable _to) public payable{
	function callV1(address _to) public payable{
		(bool success,) = _to.call{value:msg.value}("");
		require(success,"failed to callV1");
	}

	function callV2(address _to, uint256 _v1, uint256 _v2) public{
		(bool success, bytes memory outputFromCalledFunction) = _to.call(
				abi.encodeWithSignature("fun1(uint256,uint256)",_v1,_v2)
				);
		require(success,"failed to callV2");
		emit EvtCalledFunction(success,outputFromCalledFunction);
	}
	function callV3(address _to) public payable {
		(bool success, bytes memory outputFromCalledFunction) = _to.call{value:msg.value}(
				"" //abi.encodeWithSignature("fun1(uint256,uint256)",_v1,_v2)
				);
		require(success,"failed to callV3");
		emit EvtCalledFunction(success,outputFromCalledFunction);
	}
	function callV4(address _to, uint256 _v1, uint256 _v2) public payable {
		(bool success, bytes memory outputFromCalledFunction) = _to.call{value:msg.value}(
				abi.encodeWithSignature("fun1(uint256,uint256)",_v1,_v2)
				);
		require(success,"failed to callV4");
		emit EvtCalledFunction(success,outputFromCalledFunction);
	}
}

 

Remix에서 contract등록

ContractReceiver

creation of ContractReceiver pending...
[vm]from: 0x5B3...eddC4to: ContractReceiver.(constructor)value: 0 weidata: 0x608...10033logs: 0hash: 0x4b2...083be
status	true Transaction mined and execution succeed
transaction hash	0x4b24e805a7199fc6101f3ec24f19110d12ca6c3cf1f08296068bdab4030083be
from	0x5B38Da6a701c568545dCfcB03FcB875f56beddC4
to	ContractReceiver.(constructor)
gas	276617 gas
transaction cost	240536 gas 
execution cost	240536 gas 
input	0x608...10033
decoded input	{}
decoded output	 - 
logs	[]
val	0 wei

 

ContractCaller

creation of ContractCaller pending...
[vm]from: 0x5B3...eddC4to: ContractCaller.(constructor)value: 0 weidata: 0x608...10033logs: 0hash: 0xe6e...22fe3
status	true Transaction mined and execution succeed
transaction hash	0xe6ed15ff0d31301eb932ad7b3e4a9406dabfe764015d096d471e20bc43922fe3
from	0x5B38Da6a701c568545dCfcB03FcB875f56beddC4
to	ContractCaller.(constructor)
gas	696267 gas
transaction cost	605449 gas 
execution cost	605449 gas 
input	0x608...10033
decoded input	{}
decoded output	 - 
logs	[]
val	0 wei

 

ContractReceiver의 주소 할당 됨: 0xd9145CCE52D386f254917e481eB44e9943F39138

 

callV1으로 1 Ehter전송

value에 1 ether.

함수인수 0xd9145CCE52D386f254917e481eB44e9943F39138

transact to ContractCaller.callV1 pending ... 
[vm]from: 0x5B3...eddC4to: ContractCaller.callV1(address) 0xd8b...33fa8value: 1000000000000000000 weidata: 0x67a...39138logs: 1hash: 0x689...da253
status	true Transaction mined and execution succeed
transaction hash	0x689a7dc9d9daf8e547b45cde8d6a6a17b46b399a80563ea60f2fe63f0dfda253
from	0x5B38Da6a701c568545dCfcB03FcB875f56beddC4
to	ContractCaller.callV1(address) 0xd8b934580fcE35a11B58C6D73aDeE468a2833fa8
gas	38646 gas
transaction cost	33605 gas 
execution cost	33605 gas 
input	0x67a...39138
decoded input	{
	"address _to": "0xd9145CCE52D386f254917e481eB44e9943F39138"
}
decoded output	{}
logs	[
	{
		"from": "0xd9145CCE52D386f254917e481eB44e9943F39138",
		"topic": "0xe7faffa79f66b3c9e37f4a2c9cbbc1071b49ac800e4841a396cfc5fc7ced4b26",
		"event": "EvtReceive",
		"args": {
			"0": "ContractReciver1.EvtReceive is called",
			"_str": "ContractReciver1.EvtReceive is called"
		}
	}
]
val	1000000000000000000 wei

 

EvtReceive()가 호출 됨

 

callV1으로 0 Ether전송

transact to ContractCaller.callV1 pending ... 
[vm]from: 0x5B3...eddC4to: ContractCaller.callV1(address) 0xd8b...33fa8value: 0 weidata: 0x67a...39138logs: 1hash: 0xdb2...8450b
status	true Transaction mined and execution succeed
transaction hash	0xdb211f5237184eef391c72e4269f457f48371f5fa01387238d609e286e98450b
from	0x5B38Da6a701c568545dCfcB03FcB875f56beddC4
to	ContractCaller.callV1(address) 0xd8b934580fcE35a11B58C6D73aDeE468a2833fa8
gas	30941 gas
transaction cost	26905 gas 
execution cost	26905 gas 
input	0x67a...39138
decoded input	{
	"address _to": "0xd9145CCE52D386f254917e481eB44e9943F39138"
}
decoded output	{}
logs	[
	{
		"from": "0xd9145CCE52D386f254917e481eB44e9943F39138",
		"topic": "0xe7faffa79f66b3c9e37f4a2c9cbbc1071b49ac800e4841a396cfc5fc7ced4b26",
		"event": "EvtReceive",
		"args": {
			"0": "ContractReciver1.EvtReceive is called",
			"_str": "ContractReciver1.EvtReceive is called"
		}
	}
]
val	0 wei

0 Ether에도 EvtReceive()가 호출 됨

 

callV2함수 호출

fun1에 2, 3 넣어 호출

transact to ContractCaller.callV2 pending ... 
[vm]from: 0x5B3...eddC4to: ContractCaller.callV2(address,uint256,uint256) 0xd8b...33fa8value: 0 weidata: 0xea4...00003logs: 1hash: 0x1ee...2db1f
status	true Transaction mined and execution succeed
transaction hash	0x1eead82680aa07e7f411295d40d5945d28ebf5617a147bc20879295fffa2db1f
from	0x5B38Da6a701c568545dCfcB03FcB875f56beddC4
to	ContractCaller.callV2(address,uint256,uint256) 0xd8b934580fcE35a11B58C6D73aDeE468a2833fa8
gas	34065 gas
transaction cost	29621 gas 
execution cost	29621 gas 
input	0xea4...00003
decoded input	{
	"address _to": "0xd9145CCE52D386f254917e481eB44e9943F39138",
	"uint256 _v1": "2",
	"uint256 _v2": "3"
}
decoded output	{}
logs	[
	{
		"from": "0xd8b934580fcE35a11B58C6D73aDeE468a2833fa8",
		"topic": "0xd06e7294c217d0bf776778aa02ba689f58a1bd8a684572bf38be9de3576a5a8d",
		"event": "EvtCalledFunction",
		"args": {
			"0": true,
			"1": "0x0000000000000000000000000000000000000000000000000000000000000005",
			"_success": true,
			"_output": "0x0000000000000000000000000000000000000000000000000000000000000005"
		}
	}
]
val	0 wei

_output에 결과값 5

 

callV3

value: 2 ether

 

transact to ContractCaller.callV3 pending ... 
[vm]from: 0x5B3...eddC4to: ContractCaller.callV3(address) 0xd8b...33fa8value: 2000000000000000000 weidata: 0x4f0...39138logs: 2hash: 0xdea...14810
status	true Transaction mined and execution succeed
transaction hash	0xdea7ad3a2bb0fd80f94ecc0d1ba6b1cbbfe5c7defd76c1188772af68f1a14810
from	0x5B38Da6a701c568545dCfcB03FcB875f56beddC4
to	ContractCaller.callV3(address) 0xd8b934580fcE35a11B58C6D73aDeE468a2833fa8
gas	41023 gas
transaction cost	35672 gas 
execution cost	35672 gas 
input	0x4f0...39138
decoded input	{
	"address _to": "0xd9145CCE52D386f254917e481eB44e9943F39138"
}
decoded output	{}
logs	[
	{
		"from": "0xd9145CCE52D386f254917e481eB44e9943F39138",
		"topic": "0xe7faffa79f66b3c9e37f4a2c9cbbc1071b49ac800e4841a396cfc5fc7ced4b26",
		"event": "EvtReceive",
		"args": {
			"0": "ContractReciver1.EvtReceive is called",
			"_str": "ContractReciver1.EvtReceive is called"
		}
	},
	{
		"from": "0xd8b934580fcE35a11B58C6D73aDeE468a2833fa8",
		"topic": "0xd06e7294c217d0bf776778aa02ba689f58a1bd8a684572bf38be9de3576a5a8d",
		"event": "EvtCalledFunction",
		"args": {
			"0": true,
			"1": "0x",
			"_success": true,
			"_output": "0x"
		}
	}
]
val	2000000000000000000 wei

 

callV4에 0 Ether

value: 0 Ether

callV4() 인자에  3, 5

transact to ContractCaller.callV4 pending ... 
[vm]from: 0x5B3...eddC4to: ContractCaller.callV4(address,uint256,uint256) 0xd8b...33fa8value: 0 weidata: 0xb69...00005logs: 1hash: 0xde0...9c236
status	true Transaction mined and execution succeed
transaction hash	0xde0e0edf99892777d2b0cbf210915007353729f0469eef5ca53b704e6e39c236
from	0x5B38Da6a701c568545dCfcB03FcB875f56beddC4
to	ContractCaller.callV4(address,uint256,uint256) 0xd8b934580fcE35a11B58C6D73aDeE468a2833fa8
gas	34016 gas
transaction cost	29579 gas 
execution cost	29579 gas 
input	0xb69...00005
decoded input	{
	"address _to": "0xd9145CCE52D386f254917e481eB44e9943F39138",
	"uint256 _v1": "3",
	"uint256 _v2": "5"
}
decoded output	{}
logs	[
	{
		"from": "0xd8b934580fcE35a11B58C6D73aDeE468a2833fa8",
		"topic": "0xd06e7294c217d0bf776778aa02ba689f58a1bd8a684572bf38be9de3576a5a8d",
		"event": "EvtCalledFunction",
		"args": {
			"0": true,
			"1": "0x0000000000000000000000000000000000000000000000000000000000000008",
			"_success": true,
			"_output": "0x0000000000000000000000000000000000000000000000000000000000000008"
		}
	}
]
val	0 wei

0 Ether에도 EvtReceive()가 호출 안 됨

 

callV4에 3 Ether

value에 3 Ether

callV4() 인자에  3, 5

transact to ContractCaller.callV4 pending ... 
[vm]from: 0x5B3...eddC4to: ContractCaller.callV4(address,uint256,uint256) 0xd8b...33fa8value: 3000000000000000000 weidata: 0xb69...00005logs: 0hash: 0x345...58722
status	false Transaction mined but execution failed
transaction hash	0x3451cf82a3489113841bb0554c12c453a74fe288f901d68a854626961a158722
from	0x5B38Da6a701c568545dCfcB03FcB875f56beddC4
to	ContractCaller.callV4(address,uint256,uint256) 0xd8b934580fcE35a11B58C6D73aDeE468a2833fa8
gas	3000000 gas
transaction cost	33224 gas 
execution cost	33224 gas 
input	0xb69...00005
decoded input	{
	"address _to": "0xd9145CCE52D386f254917e481eB44e9943F39138",
	"uint256 _v1": "3",
	"uint256 _v2": "5"
}
decoded output	{}
logs	[]
val	3000000000000000000 wei
transact to ContractCaller.callV4 errored: VM error: revert.

revert
	The transaction has been reverted to the initial state.
Reason provided by the contract: "failed to callV4".
Debug the transaction to get more information.

 

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