Solidity send Ex1

 

//SPDX-License-Identifier: UNLICENSED
pragma solidity >=0.7.0 <0.9.0;

contract Send1 {
	function sendV1(address payable _addr) public payable {
		bool rst = _addr.send(11 ether);
	}
	function sendV2(address payable _addr) public payable {
		bool rst = _addr.send(11 ether);
		require(rst, "failed");
	}
	function sendV3(address payable _addr) public {
		bool rst = _addr.send(11 ether);
		require(rst, "failed");
	}
	function sendV4(address payable _addr) public {
		bool rst = payable(_addr).send(11 ether);
		require(rst, "failed");
	}
}

 

Deploy

creation of Send1 pending...
[vm]from: 0x5B3...eddC4to: Send1.(constructor)value: 0 weidata: 0x608...70033logs: 0hash: 0x892...abe2f
status	true Transaction mined and execution succeed
transaction hash	0x892e453378b7ed64693525719da766ae41b48c6ffb0f6832913b33ef8ffabe2f
from	0x5B38Da6a701c568545dCfcB03FcB875f56beddC4
to	Send1.(constructor)
gas	307144 gas
transaction cost	267081 gas 
execution cost	267081 gas 
input	0x608...70033
decoded input	{}
decoded output	 - 
logs	[]
val	0 wei
transact to Send1.sendV1 pending ...

 

 

SendV1

account: 0x4B20993Bc481177ec7E8f571ceCaE8A9e22C02db
value: 30 ether

대상: 0xd9145CCE52D386f254917e481eB44e9943F39138

transact to Send1.sendV1 pending ... 
[vm]from: 0x4B2...C02dbto: Send1.sendV1(address) 0xd91...39138value: 30000000000000000000 weidata: 0x184...35cb2logs: 0hash: 0x627...a1260
status	true Transaction mined and execution succeed
transaction hash	0x6271cec922c8aea9dfce73915cc59529e7c0cee4e734119ec39afd9ebc7a1260
from	0x4B20993Bc481177ec7E8f571ceCaE8A9e22C02db
to	Send1.sendV1(address) 0xd9145CCE52D386f254917e481eB44e9943F39138
gas	35915 gas
transaction cost	31230 gas 
execution cost	31230 gas 
input	0x184...35cb2
decoded input	{
	"address _addr": "0xAb8483F64d9C6d1EcF9b849Ae677dD3315835cb2"
}
decoded output	{}
logs	[]
val	30000000000000000000 wei

 

출금은 약 30 ether(+수수료차이) 빠져 나갔지만,
입금은 11 ether가 되어 잔고 111 ether가 되었다.
Contract에는 0에서 19 Eth로 남아있다.

 

만약 Contract에 0 Eth고 Value에 10 Eth를 입력할 경우, Contract는 9 Eth(+수수료)가 되고 목적 지갑에는 11 ether를 넣을 수 없으므로 입금이 안 되고 transact은 성공을 출력하고 끝난다.

만약 Contract에 0 Eth고 Value에 30 Eth를 입력할 경우, Contract는 18 Eth가 되고 목적 지갑에는 11 ether를 넣을 수 있으므로 입금되고 transact은 성공을 출력하고 끝난다.

 

SendV2

account: 0x4B20993Bc481177ec7E8f571ceCaE8A9e22C02db
value: 30 ether

대상: 0xd9145CCE52D386f254917e481eB44e9943F39138

transact to Send1.sendV2 pending ... 
[vm]from: 0x4B2...C02dbto: Send1.sendV2(address) 0xd91...39138value: 30000000000000000000 weidata: 0x4fe...35cb2logs: 0hash: 0x03f...9fd09
status	true Transaction mined and execution succeed
transaction hash	0x03f1bf4f76a29372a422c0e16e00c4afaff50513d052e776f2e8cf8112a9fd09
from	0x4B20993Bc481177ec7E8f571ceCaE8A9e22C02db
to	Send1.sendV2(address) 0xd9145CCE52D386f254917e481eB44e9943F39138
gas	35985 gas
transaction cost	31291 gas 
execution cost	31291 gas 
input	0x4fe...35cb2
decoded input	{
	"address _addr": "0xAb8483F64d9C6d1EcF9b849Ae677dD3315835cb2"
}
decoded output	{}
logs	[]
val	30000000000000000000 wei

 

 

만약 Contract에 0 Eth고 Value에 10 Eth를 입력할 경우, SendV1과 달리 Contract에 Eth는 변화가 없고 목적 지갑에도 11 ether를 넣을 수 없으므로 입금이 안 되고 transact은 실패를 출력하고 끝난다.
예제: Contract 0Eth, Value 10Eth

transact to Send1.sendV2 pending ... 
[vm]from: 0x4B2...C02dbto: Send1.sendV2(address) 0xd91...39138value: 10000000000000000000 weidata: 0x4fe...35cb2logs: 0hash: 0x5b7...001b3
status	false Transaction mined but execution failed
transaction hash	0x5b7114c52b10b4fb65f7e6e2dbb2e14eb2d39270ad0d789c12d3def592b001b3
from	0x4B20993Bc481177ec7E8f571ceCaE8A9e22C02db
to	Send1.sendV2(address) 0xd9145CCE52D386f254917e481eB44e9943F39138
gas	3000000 gas
transaction cost	31576 gas 
execution cost	31576 gas 
input	0x4fe...35cb2
decoded input	{
	"address _addr": "0xAb8483F64d9C6d1EcF9b849Ae677dD3315835cb2"
}
decoded output	{}
logs	[]
val	10000000000000000000 wei
transact to Send1.sendV2 errored: VM error: revert.

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

 

 

만약 Contract에 7 Eth고 Value에 5 Eth를 입력할 경우, Contract에 0 Eth, 목적 지갑에는 11 ether를 넣을 수 있으므로 입금이 되고 transact은 성공을 출력하고 끝난다.