9.4_erc20代币说明¶
contract ERC20Token {
//Token的名字,比如Bitcoin, Ethereum, Mother Of All Chain
string public name;
//Token的符号或者叫代码, 比如BTC, ETH, MOAC
string public symbol;
//Token使用的小数点后几位,比如6,表示分配一个token的数量为1000000
uint public decimals;
//Token的总供应量
uint256 public totalSupply;
//返回_owner帐户的帐户余额,即Token数量
function balanceOf(address _owner) public constant returns (uint256 balance);
//转移_value的token数量到地址_to, 并且必须触发Transfer事件
function transfer(address _to, uint256 _value) public returns (bool success);
//从地址_from发送数量为_value的token到地址_to, 必须触发Transfer事件
function transferFrom(address _from, address _to, uint256 _value) public returns (bool success);
//允许_spender多次取回您的帐户最高达_value的token数量
function approve(address _spender, uint256 _value) public returns (bool success);
//_spender仍然被允许从_owner提取的token数量
function allowance(address _owner, address _spender) public constant returns (uint256 remaining);
//当token被转移(包括0值),必须被触发
event Transfer(address indexed _from, address indexed _to, uint256 _value);
//当任何成功调用approve(address _spender, uint256 _value)后,必须被触发
event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}
开发erc20代币智能合约¶
比如使用zeppelin库进行开发
pragma solidity ^0.4.18;
import "zeppelin-solidity/contracts/token/PausableToken.sol";
contract TestCoin is PausableToken {
string public name = "Test";
string public symbol = "TEST";
uint public decimals = 6;
uint public INITIAL_SUPPLY = 100000000 * (10 ** decimals);
function TestCoin() public {
totalSupply = INITIAL_SUPPLY;
balances[msg.sender] = INITIAL_SUPPLY;
}
}
展开以后是这样的
pragma solidity ^0.4.13;
library SafeMath {
function mul(uint256 a, uint256 b) internal pure returns (uint256) {
if (a == 0) {
return 0;
}
uint256 c = a * b;
assert(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 Ownable {
address public owner;
event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
/**
* @dev The Ownable constructor sets the original `owner` of the contract to the sender
* account.
*/
function Ownable() public {
owner = msg.sender;
}
/**
* @dev Throws if called by any account other than the owner.
*/
modifier onlyOwner() {
require(msg.sender == owner);
_;
}
/**
* @dev Allows the current owner to transfer control of the contract to a newOwner.
* @param newOwner The address to transfer ownership to.
*/
function transferOwnership(address newOwner) public onlyOwner {
require(newOwner != address(0));
OwnershipTransferred(owner, newOwner);
owner = newOwner;
}
}
contract Pausable is Ownable {
event Pause();
event Unpause();
bool public paused = false;
/**
* @dev Modifier to make a function callable only when the contract is not paused.
*/
modifier whenNotPaused() {
require(!paused);
_;
}
/**
* @dev Modifier to make a function callable only when the contract is paused.
*/
modifier whenPaused() {
require(paused);
_;
}
/**
* @dev called by the owner to pause, triggers stopped state
*/
function pause() onlyOwner whenNotPaused public {
paused = true;
Pause();
}
/**
* @dev called by the owner to unpause, returns to normal state
*/
function unpause() onlyOwner whenPaused public {
paused = false;
Unpause();
}
}
contract ERC20Basic {
uint256 public totalSupply;
function balanceOf(address who) public view returns (uint256);
function transfer(address to, uint256 value) public returns (bool);
event Transfer(address indexed from, address indexed to, uint256 value);
}
contract BasicToken is ERC20Basic {
using SafeMath for uint256;
mapping(address => uint256) balances;
/**
* @dev transfer token for a specified address
* @param _to The address to transfer to.
* @param _value The amount to be transferred.
*/
function transfer(address _to, uint256 _value) public returns (bool) {
require(_to != address(0));
require(_value <= balances[msg.sender]);
// SafeMath.sub will throw if there is not enough balance.
balances[msg.sender] = balances[msg.sender].sub(_value);
balances[_to] = balances[_to].add(_value);
Transfer(msg.sender, _to, _value);
return true;
}
/**
* @dev Gets the balance of the specified address.
* @param _owner The address to query the the balance of.
* @return An uint256 representing the amount owned by the passed address.
*/
function balanceOf(address _owner) public view returns (uint256 balance) {
return balances[_owner];
}
}
contract ERC20 is ERC20Basic {
function allowance(address owner, address spender) public view returns (uint256);
function transferFrom(address from, address to, uint256 value) public returns (bool);
function approve(address spender, uint256 value) public returns (bool);
event Approval(address indexed owner, address indexed spender, uint256 value);
}
contract StandardToken is ERC20, BasicToken {
mapping (address => mapping (address => uint256)) internal allowed;
/**
* @dev Transfer tokens from one address to another
* @param _from address The address which you want to send tokens from
* @param _to address The address which you want to transfer to
* @param _value uint256 the amount of tokens to be transferred
*/
function transferFrom(address _from, address _to, uint256 _value) public returns (bool) {
require(_to != address(0));
require(_value <= balances[_from]);
require(_value <= allowed[_from][msg.sender]);
balances[_from] = balances[_from].sub(_value);
balances[_to] = balances[_to].add(_value);
allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
Transfer(_from, _to, _value);
return true;
}
/**
* @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
*
* Beware that changing an allowance with this method brings the risk that someone may use both the old
* and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this
* race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards:
* https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
* @param _spender The address which will spend the funds.
* @param _value The amount of tokens to be spent.
*/
function approve(address _spender, uint256 _value) public returns (bool) {
allowed[msg.sender][_spender] = _value;
Approval(msg.sender, _spender, _value);
return true;
}
/**
* @dev Function to check the amount of tokens that an owner allowed to a spender.
* @param _owner address The address which owns the funds.
* @param _spender address The address which will spend the funds.
* @return A uint256 specifying the amount of tokens still available for the spender.
*/
function allowance(address _owner, address _spender) public view returns (uint256) {
return allowed[_owner][_spender];
}
/**
* @dev Increase the amount of tokens that an owner allowed to a spender.
*
* approve should be called when allowed[_spender] == 0. To increment
* allowed value is better to use this function to avoid 2 calls (and wait until
* the first transaction is mined)
* From MonolithDAO Token.sol
* @param _spender The address which will spend the funds.
* @param _addedValue The amount of tokens to increase the allowance by.
*/
function increaseApproval(address _spender, uint _addedValue) public returns (bool) {
allowed[msg.sender][_spender] = allowed[msg.sender][_spender].add(_addedValue);
Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
return true;
}
/**
* @dev Decrease the amount of tokens that an owner allowed to a spender.
*
* approve should be called when allowed[_spender] == 0. To decrement
* allowed value is better to use this function to avoid 2 calls (and wait until
* the first transaction is mined)
* From MonolithDAO Token.sol
* @param _spender The address which will spend the funds.
* @param _subtractedValue The amount of tokens to decrease the allowance by.
*/
function decreaseApproval(address _spender, uint _subtractedValue) public returns (bool) {
uint oldValue = allowed[msg.sender][_spender];
if (_subtractedValue > oldValue) {
allowed[msg.sender][_spender] = 0;
} else {
allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
}
Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
return true;
}
}
contract PausableToken is StandardToken, Pausable {
function transfer(address _to, uint256 _value) public whenNotPaused returns (bool) {
return super.transfer(_to, _value);
}
function transferFrom(address _from, address _to, uint256 _value) public whenNotPaused returns (bool) {
return super.transferFrom(_from, _to, _value);
}
function approve(address _spender, uint256 _value) public whenNotPaused returns (bool) {
return super.approve(_spender, _value);
}
function increaseApproval(address _spender, uint _addedValue) public whenNotPaused returns (bool success) {
return super.increaseApproval(_spender, _addedValue);
}
function decreaseApproval(address _spender, uint _subtractedValue) public whenNotPaused returns (bool success) {
return super.decreaseApproval(_spender, _subtractedValue);
}
}
contract TestCoin is PausableToken {
string public name = "Test Coin";
string public symbol = "TEST";
uint public decimals = 6;
uint public INITIAL_SUPPLY = 100000000 * (10 ** decimals);
function TestCoin() public {
totalSupply = INITIAL_SUPPLY;
balances[msg.sender] = INITIAL_SUPPLY;
}
}
或者直接进行开发
pragma solidity ^0.4.16;
contract ERC20Token {
uint256 public totalSupply;
function balanceOf(address _owner) public constant returns (uint256 balance);
function transfer(address _to, uint256 _value) public returns (bool success);
function transferFrom(address _from, address _to, uint256 _value) public returns (bool success);
function approve(address _spender, uint256 _value) public returns (bool success);
function allowance(address _owner, address _spender) public constant returns (uint256 remaining);
event Transfer(address indexed _from, address indexed _to, uint256 _value);
event Approval(address indexed _owner, address indexed _spender, uint256 _value);
}
contract TestToken is ERC20Token {
string public name = "Test Coin";
string public symbol = "TEST";
uint8 public decimals = 6;
uint256 public INITIAL_SUPPLY = 100000000 * (10 ** uint256(decimals));
mapping (address => uint256) balances;
mapping (address => mapping (address => uint256)) allowed;
constructor() public {
totalSupply = INITIAL_SUPPLY;
balances[msg.sender] = INITIAL_SUPPLY;
}
function transfer(address _to, uint256 _value) public returns (bool success) {
require(balances[msg.sender] >= _value && balances[_to] + _value > balances[_to]);
require(_to != 0x0);
balances[msg.sender] -= _value;
balances[_to] += _value;
emit Transfer(msg.sender, _to, _value);
return true;
}
function transferFrom(address _from, address _to, uint256 _value) public returns (bool success) {
require(balances[_from] >= _value && allowed[_from][msg.sender] >= _value);
balances[_to] += _value;
balances[_from] -= _value;
allowed[_from][msg.sender] -= _value;
emit Transfer(_from, _to, _value);
return true;
}
function balanceOf(address _owner) public constant returns (uint256 balance) {
return balances[_owner];
}
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 constant returns (uint256 remaining) {
return allowed[_owner][_spender];
}
}
编译erc20代币智能合约,生成abi及bytecode¶
使用remix编译
复制abi及bytecode以便下一步创建智能合约
[
{
"constant": true,
"inputs": [],
"name": "name",
"outputs": [
{
"name": "",
"type": "string"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": false,
"inputs": [
{
"name": "_spender",
"type": "address"
},
{
"name": "_value",
"type": "uint256"
}
],
"name": "approve",
"outputs": [
{
"name": "success",
"type": "bool"
}
],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "totalSupply",
"outputs": [
{
"name": "",
"type": "uint256"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": false,
"inputs": [
{
"name": "_from",
"type": "address"
},
{
"name": "_to",
"type": "address"
},
{
"name": "_value",
"type": "uint256"
}
],
"name": "transferFrom",
"outputs": [
{
"name": "success",
"type": "bool"
}
],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "INITIAL_SUPPLY",
"outputs": [
{
"name": "",
"type": "uint256"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "decimals",
"outputs": [
{
"name": "",
"type": "uint8"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": false,
"inputs": [],
"name": "TestCoin",
"outputs": [],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": true,
"inputs": [
{
"name": "_owner",
"type": "address"
}
],
"name": "balanceOf",
"outputs": [
{
"name": "balance",
"type": "uint256"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "symbol",
"outputs": [
{
"name": "",
"type": "string"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": false,
"inputs": [
{
"name": "_to",
"type": "address"
},
{
"name": "_value",
"type": "uint256"
}
],
"name": "transfer",
"outputs": [
{
"name": "success",
"type": "bool"
}
],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": true,
"inputs": [
{
"name": "_owner",
"type": "address"
},
{
"name": "_spender",
"type": "address"
}
],
"name": "allowance",
"outputs": [
{
"name": "remaining",
"type": "uint256"
}
],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"anonymous": false,
"inputs": [
{
"indexed": true,
"name": "_from",
"type": "address"
},
{
"indexed": true,
"name": "_to",
"type": "address"
},
{
"indexed": false,
"name": "_value",
"type": "uint256"
}
],
"name": "Transfer",
"type": "event"
},
{
"anonymous": false,
"inputs": [
{
"indexed": true,
"name": "_owner",
"type": "address"
},
{
"indexed": true,
"name": "_spender",
"type": "address"
},
{
"indexed": false,
"name": "_value",
"type": "uint256"
}
],
"name": "Approval",
"type": "event"
}
]
bytecode为
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
命令行使用solc编译¶
运行如下命令,输出TestToken.abi及TestToken.bin到bin目录下,TestToken.abi里边放的就是abi的内容,TestToken.bin里边放的就是bytecode的内容。
solc --bin --abi -o bin TestToken.sol
程序中使用solc编译¶
var fs = require('fs');
var solc = require('solc');
var cmds = process.argv;
if(cmds != null && cmds.length > 2){
var file = cmds[2];
var name = cmds[3];
var content = fs.readFileSync(file).toString();
var input = {
file: content
};
var output = solc.compile({sources: input}, 1);
console.log('contracts', Object.keys(output.contracts));
var ctt = output.contracts[name];
if(ctt == null){
return;
}
var bytecode = ctt.bytecode;
var abi = JSON.parse(ctt.interface);
console.log('bytecode', bytecode);
console.log('abi', ctt.interface);
}
部署erc20代币智能合约¶
function createContract(chain3, account, abiString, bytecodeString){
var bytecode = "0x" + bytecodeString;
var abi = JSON.parse(abiString);
console.log('bytecode', bytecode);
console.log('abi', abiString);
var gasValue = chain3.mc.estimateGas({data: bytecode});
console.log("gas estimate on contract:", gasValue);
var address = account.address;
var secret = account.secret;
var txCount = chain3.mc.getTransactionCount(address);
console.log("get tx account", txCount)
var rawTx = {
from: address,
nonce: chain3.intToHex(txCount),
gasPrice: chain3.intToHex(25000000000),
gasLimit: chain3.intToHex(gasValue * 10), //"* 10", 具体原因可查看 https://github.com/MOACChain/moac-core/issues/6, 后续问题修复后从文档中移掉 "* 10"
value: '0x00',
data: bytecode
};
console.log('raw tx:', rawTx);
var tx = new chain3.transaction(rawTx);
console.log('version:', chain3.version.network);
tx.setChainId(chain3.version.network);
console.log("tx chain id:", tx.getChainId())
//Requires the private key
var privateKey = new Buffer(secret, 'hex');
console.log(tx.toJSON());
tx.sign(privateKey);
console.log("after signed:", tx.toJSON());
var signedTx = '0x' + tx.serialize().toString('hex');
console.log("send signed tx:", signedTx);
console.log("len", signedTx.length);
tx.verifySignature();
var recover = '0x' + tx.getSenderAddress().toString('hex');
console.log("recovered address:", recover);
chain3.mc.sendRawTransaction(signedTx, function(err, hash) {
if (!err){
console.log("succeed: ", hash);
//等合约创建完成,返回合约地址
var filter = chain3.mc.filter('latest');
filter.watch(function(error, result) {
var receipt = chain3.mc.getTransactionReceipt(hash);
if (!error && receipt && receipt.transactionHash == hash) {
console.log("contract address: ", receipt && receipt.contractAddress);
filter.stopWatching();
}
});
}else{
console.log("error:", err.message);
}
});
}
调用erc20代币智能合约¶
一种方法是通过abi生成智能合约对象, 直接通过对应合约方法进行call调用,如下例子说明查询erc20代币相应帐户对应的代币数量的例子.
function callContract(chain3, contractAddress, address, abiString){
var abi = JSON.parse(abiString);
var contract = chain3.mc.contract(abi);
var token = contract.at(contractAddress);
token.balanceOf.call(address, function(err, result){
console.log(err, result);
});
}
另外一种方法通过对交易签名进行调用,如下例子说明调用erc20代币的转帐交易的方法
function callContract(chain3, account, contractAddress, address, abiString){
var abi = JSON.parse(abiString);
var contract = chain3.mc.contract(abi);
var token = contract.at(contractAddress);
console.log('data', token.balanceOf.getData(address));
var privateKey = new Buffer(account.secret, "hex");
var txCount = chain3.mc.getTransactionCount(account.address);
var rawTx = {
nonce: chain3.intToHex(txCount),
gasPrice: chain3.intToHex(25000000000),
gasLimit: chain3.intToHex(40000),
to: contractAddress,
data: token.transfer.getData(destinate, 100),
};
var tx = new chain3.transaction(rawTx);
tx.setChainId(chain3.version.network);
tx.sign(privateKey);
var signedTx = '0x' + tx.serialize().toString('hex');
chain3.mc.sendRawTransaction(signedTx, function(err, hash) {
if (!err){
console.log("succeed: ", hash);
}else{
console.log("error:", err.message);
}
});
}