端午节放假了,饱食终日,无所事事,用solidity写了个以太坊代币,于是离骚币诞生了,纪念屈原,今年不仅仅是读一遍离骚了。
代码地址:https://etherscan.io/address/0x9a5dcd4348549d719813431f10fbb6d1c1758d83#code
代币地址:https://etherscan.io/token/0x9a5dcd4348549d719813431f10fbb6d1c1758d83
这里也贴一份:
pragma solidity ^0.4.24;
/**
* @title SafeMath
* @dev Math operations with safety checks that throw on error
防止整数溢出问题
*/
library SafeMath {
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a * b;
assert(a == 0 || c / a == b);
return c;
}
function div(uint256 a, uint256 b) internal pure returns (uint256) {
// assert(b > 0); // Solidity automatically throws when dividing by 0
uint256 c = a / b;
// assert(a == b * c + a % b); // There is no case in which this doesn't hold
return c;
}
function sub(uint256 a, uint256 b) internal pure returns (uint256) {
assert(b <= a);
return a - b;
}
function add(uint256 a, uint256 b) internal pure returns (uint256) {
uint256 c = a + b;
assert(c >= a);
return c;
}
}
contract StandardToken {
//使用SafeMath
using SafeMath for uint256;
//代币名称
string public name;
//代币缩写
string public symbol;
//代币小数位数(一个代币可以分为多少份)
uint8 public decimals;
//代币总数
uint256 public totalSupply;
//交易的发起方(谁调用这个方法,谁就是交易的发起方)把_value数量的代币发送到_to账户
function transfer(address _to, uint256 _value) public returns (bool success);
//从_from账户里转出_value数量的代币到_to账户
function transferFrom(address _from, address _to, uint256 _value) public returns (bool success);
//交易的发起方把_value数量的代币的使用权交给_spender,然后_spender才能调用transferFrom方法把我账户里的钱转给另外一个人
function approve(address _spender, uint256 _value) public returns (bool success);
//查询_spender目前还有多少_owner账户代币的使用权
function allowance(address _owner, address _spender) public constant returns (uint256 remaining);
//转账成功的事件
event Transfer(address indexed _from, address indexed _to, uint256 _value);
//使用权委托成功的事件
event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}
//设置代币控制合约的管理员
contract Owned {
// modifier(条件),表示必须是权力所有者才能do something,类似administrator的意思
modifier onlyOwner() {
require(msg.sender == owner);
_;//do something
}
//权力所有者
address public owner;
//合约创建的时候执行,执行合约的人是第一个owner
constructor() public {
owner = msg.sender;
}
//新的owner,初始为空地址,类似null
address newOwner=0x0;
//更换owner成功的事件
event OwnerUpdate(address _prevOwner, address _newOwner);
//现任owner把所有权交给新的owner(需要新的owner调用acceptOwnership方法才会生效)
function changeOwner(address _newOwner) public onlyOwner {
require(_newOwner != owner);
newOwner = _newOwner;
}
//新的owner接受所有权,权力交替正式生效
function acceptOwnership() public{
require(msg.sender == newOwner);
emit OwnerUpdate(owner, newOwner);
owner = newOwner;
newOwner = 0x0;
}
}
//代币的控制合约
contract Controlled is Owned{
//创世vip
constructor() public {
setExclude(msg.sender,true);
}
// 控制代币是否可以交易,true代表可以(exclude里的账户不受此限制,具体实现在下面的transferAllowed里)
bool public transferEnabled = true;
// 是否启用账户锁定功能,true代表启用
bool lockFlag=true;
// 锁定的账户集合,address账户,bool是否被锁,true:被锁定,当lockFlag=true时,恭喜,你转不了账了,哈哈
mapping(address => bool) locked;
// 拥有特权用户,不受transferEnabled和lockFlag的限制,vip啊,bool为true代表vip有效
mapping(address => bool) exclude;
//设置transferEnabled值
function enableTransfer(bool _enable) public onlyOwner returns (bool success){
transferEnabled=_enable;
return true;
}
//设置lockFlag值
function disableLock(bool _enable) public onlyOwner returns (bool success){
lockFlag=_enable;
return true;
}
// 把_addr加到锁定账户里,拉黑名单。。。
function addLock(address _addr) public onlyOwner returns (bool success){
require(_addr!=msg.sender);
locked[_addr]=true;
return true;
}
//设置vip用户
function setExclude(address _addr,bool _enable) public onlyOwner returns (bool success){
exclude[_addr]=_enable;
return true;
}
//解锁_addr用户
function removeLock(address _addr) public onlyOwner returns (bool success){
locked[_addr]=false;
return true;
}
//控制合约 核心实现
modifier transferAllowed(address _addr) {
if (!exclude[_addr]) {
require(transferEnabled,"transfer is not enabeled now!");
if(lockFlag){
require(!locked[_addr],"you are locked!");
}
}
_;
}
}
//端午节,代币离骚
contract LiSaoToken is StandardToken,Controlled {
//账户集合
mapping (address => uint256) public balanceOf;
mapping (address => mapping (address => uint256)) internal allowed;
constructor() public {
totalSupply = 1000000000;//10亿
name = "LiSao Token";
symbol = "LS";
decimals = 0;
balanceOf[msg.sender] = totalSupply;
}
function transfer(address _to, uint256 _value) public transferAllowed(msg.sender) returns (bool success) {
require(_to != address(0));
require(_value <= balanceOf[msg.sender]);
balanceOf[msg.sender] = balanceOf[msg.sender].sub(_value);
balanceOf[_to] = balanceOf[_to].add(_value);
emit Transfer(msg.sender, _to, _value);
return true;
}
function transferFrom(address _from, address _to, uint256 _value) public transferAllowed(_from) returns (bool success) {
require(_to != address(0));
require(_value <= balanceOf[_from]);
require(_value <= allowed[_from][msg.sender]);
balanceOf[_from] = balanceOf[_from].sub(_value);
balanceOf[_to] = balanceOf[_to].add(_value);
allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
emit Transfer(_from, _to, _value);
return true;
}
function approve(address _spender, uint256 _value) public returns (bool success) {
allowed[msg.sender][_spender] = _value;
emit Approval(msg.sender, _spender, _value);
return true;
}
function allowance(address _owner, address _spender) public view returns (uint256 remaining) {
return allowed[_owner][_spender];
}
}
1.代码介绍
遵守ERC20协议
具体代码体现:contract StandardToken
ERC20协议的github地址:https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20.md
遵守协议就是统一状态变量的名称和方法的名称,大家看代码里StandardToken合约里就是了,可能会觉得奇怪,官方文档里明明写的是像这种方法
function name() view returns (string name)
你的代码里咋没写呢?因为我定义了 string public name,而public的公共变量name,会自动生成一个返回name的name()的方法,所以我不用重复写function name()了,其它几个变量也是一样的
引入SafeMath,防止整数溢出漏洞(SMT,BEC)
具体代码实现:library SafeMath
官方介绍地址:https://ethereumdev.io/safemath-protect-overflows/
设置一个控制合约
具体代码体现:contract Controlled
作用:
1.有突发情况,可以暂停所有人的转账
2.设置黑名单功能,可以冻结黑名单帐户,让它无法转账
3.也可以设置vip帐户,不受前面两个的控制
管理员
具体代码体现:contract Owned
既然有控制合约,各种转账控制,那么谁来设置这个东西,如果人人都有权限,那就乱套了,所以需要一个唯一管理员;管理员也可以把这个权力禅让给一个新的管理员
具体实现代币功能
具体代码体现:contract LiSaoToken
功能点,通俗的讲就是 :
1.自己转账给他人(transfer)
2.自己帮别人转账给另外一个人(transferFrom)
3.我委托你帮我管理我的代币,使用权给你,但是币还在我这(approve)
4.查看一下我还有多少币委托你在管理(allowance)
2.开发部署
remix,开发和部署一体的
solidity的开发工具,在线工具:http://remix.ethereum.org,浏览器直接打开就行,很省事,当然也可以安装本地版,remix官网的安装介绍看起来很简单,几行命令就ok了,但是实际上很坑,反正我放弃了
metamask钱包
chrome浏览器的一个钱包插件,官网地址:https://metamask.io/,安装方法也在首页有,但是安装的时候需要FQ,了解一下?
发布流程
设置gas价格,确认交易
然后就可以看的remix的日志信息了
点开连接等待挖矿完成就好了
metamask钱包导入自己的代币
拷贝合约地址
增加代币管理
10亿个代币: