So I modified the ERC20 token a little bit added two extra functions so that my ICO token contract can call it to send some tokens to the people.
This is my erc20 token code.
pragma solidity ^0.4.24;
contract SafeMath {
function safeAdd(uint a, uint b) public pure returns (uint c) {
c = a + b;
require(c >= a);
}
function safeSub(uint a, uint b) public pure returns (uint c) {
require(b <= a);
c = a - b;
}
function safeMul(uint a, uint b) public pure returns (uint c) {
c = a * b;
require(a == 0 || c / a == b);
}
function safeDiv(uint a, uint b) public pure returns (uint c) {
require(b > 0);
c = a / b;
}
}
contract ERC20Token is SafeMath {
mapping(address => uint256) balances;
mapping(address => mapping(address => uint)) allowed;
uint _totalSupply;
function totalSupply() public constant returns (uint) {
return _totalSupply - balances[address(0)];
}
function balanceOf(address tokenOwner) public constant returns (uint balance) {
return balances[tokenOwner];
}
function transfer(address to, uint tokens) public returns (bool success) {
balances[msg.sender] = safeSub(balances[msg.sender], tokens);
balances[to] = safeAdd(balances[to], tokens);
emit Transfer(msg.sender, to, tokens);
return true;
}
function approve(address spender, uint tokens) public returns (bool success) {
allowed[msg.sender][spender] = tokens;
emit Approval(msg.sender, spender, tokens);
return true;
}
function transferFrom(address from, address to, uint tokens) public returns (bool success) {
balances[from] = safeSub(balances[from], tokens);
allowed[from][msg.sender] = safeSub(allowed[from][msg.sender], tokens);
balances[to] = safeAdd(balances[to], tokens);
emit Transfer(from, to, tokens);
return true;
}
function allowance(address tokenOwner, address spender) public constant returns (uint remaining) {
return allowed[tokenOwner][spender];
}
event Transfer(address indexed from, address indexed to, uint tokens);
event Approval(address indexed tokenOwner, address indexed spender, uint tokens);
}
contract Owned {
address public owner;
address public newOwner;
event OwnershipTransferred(address indexed _from, address indexed _to);
constructor() public {
owner = msg.sender;
}
modifier onlyOwner {
require(msg.sender == owner);
_;
}
function transferOwnership(address _newOwner) public onlyOwner {
newOwner = _newOwner;
}
function acceptOwnership() public {
require(msg.sender == newOwner);
emit OwnershipTransferred(owner, newOwner);
owner = newOwner;
newOwner = address(0);
}
}
contract OurToken is ERC20Token, Owned {
string public symbol;
string public name;
uint public decimals;
address public crowdsaleAddress;
uint public ICOEndTime = 0;
modifier onlyCrowdsale {
require(msg.sender == crowdsaleAddress);
_;
}
modifier afterCrowdsale {
require(now > ICOEndTime);
_;
}
constructor (string _symbol,string _name,uint _decimals,uint totalSupply) public {
symbol = _symbol;
name = _name;
decimals = _decimals;
_totalSupply = totalSupply * 10 ** decimals;
owner = msg.sender;
balances[msg.sender] = _totalSupply;
}
function transfer(address to, uint tokens) public afterCrowdsale returns (bool) {
super.transfer(to,tokens);
}
function transferFrom(address from, address to, uint tokens) public afterCrowdsale returns (bool) {
super.transferFrom(from,to,tokens);
}
function emergencyExtract() external onlyOwner {
owner.transfer(address(this).balance);
}
function setICOEndtime(uint time) public onlyOwner {
require(time>0);
ICOEndTime = time;
}
function setCrowdsale(address _crowdsaleAddress) public onlyOwner {
require(_crowdsaleAddress != address(0));
crowdsaleAddress = _crowdsaleAddress;
}
function releaseTokens(address _receiver, uint256 _amount) public onlyCrowdsale {
require(_receiver != address(0));
require(_amount > 0);
balances[owner] = safeSub(balances[owner], _amount);
balances[_receiver] = safeAdd(balances[_receiver], _amount);
emit Transfer(owner, _receiver, _amount);
}
function refundTokens(address _sender, uint256 _amount) public onlyCrowdsale {
balances[_sender] = safeSub(balances[_sender], _amount);
balances[owner] = safeAdd(balances[owner], _amount);
emit Transfer(_sender,owner,_amount);
}
}
ICO contract
pragma solidity ^0.4.24;
contract OurToken {
function balanceOf(address tokenOwner) public constant returns (uint balance);
// To release tokens to the address that have send ether.
function releaseTokens(address _receiver, uint _amount) public;
// To take back tokens after refunding ether.
function refundTokens(address _receiver, uint _amount) public;
}
contract ICO {
uint public icoStart;
uint public icoEnd;
uint public tokenRate;
OurToken public token;
uint public fundingGoal;
uint public tokensRaised;
uint public etherRaised;
address public owner;
address public extractor;
modifier whenIcoCompleted {
require(now>icoEnd);
_;
}
modifier onlyOwner {
require(msg.sender == owner);
_;
}
modifier onlyExtractor {
require(msg.sender == extractor || msg.sender == owner);
_;
}
constructor(uint256 _icoStart, uint _icoEnd, uint _tokenRate, address _tokenAddress, uint _fundingGoal, address _extractor) public {
require(_icoStart != 0 &&
_icoEnd != 0 &&
_icoStart < _icoEnd &&
_tokenRate != 0 &&
_tokenAddress != address(0) &&
_fundingGoal != 0);
icoStart = _icoStart;
icoEnd = _icoEnd;
tokenRate = _tokenRate;
token = OurToken(_tokenAddress);
fundingGoal = _fundingGoal;
owner = msg.sender;
extractor = _extractor;
}
function () public payable {
buy();
}
function buy() public payable {
require(msg.sender!=owner);
require(tokensRaised < fundingGoal);
require(now < icoEnd && now > icoStart);
uint tokensToBuy;
uint etherUsed = msg.value;
tokensToBuy = (etherUsed/ 1 ether) * tokenRate;
if(tokensRaised + tokensToBuy > fundingGoal) {
uint exceedingTokens = tokensRaised + tokensToBuy - fundingGoal;
uint exceedingEther;
exceedingEther = (exceedingTokens * 1 ether) / tokenRate;
msg.sender.transfer(exceedingEther);
tokensToBuy -= exceedingTokens;
etherUsed -= exceedingEther;
}
token.releaseTokens(msg.sender, tokensToBuy);
tokensRaised += tokensToBuy;
etherRaised += etherUsed;
}
function returnEther() public whenIcoCompleted {
require(tokensRaised < fundingGoal);
uint balance = token.balanceOf(msg.sender);
uint etherToBeReturned = (balance / tokenRate) * 1 ether;
msg.sender.transfer(etherToBeReturned);
token.refundTokens(msg.sender,balance);
etherRaised -= etherToBeReturned;
}
function extractEther() public whenIcoCompleted onlyExtractor {
extractor.transfer(address(this).balance);
}
}
Yes, I set the ico address and end time in erc20 token after the ico is deployed.
The contract is accepting ether when payable method is being called directly but sending just ether to the contract address doesn't trigger the payable function.
Can someone explain why?