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@jtobin jtobin/crowdfund.js
Created Mar 3, 2016

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Ethereum crowdsale example
var foo = eth.accounts[0];
personal.unlockAccount(foo, 'mypassword');
miner.setEtherbase(foo);
var crowdSrc = "contract token { mapping (address => uint) public coinBalanceOf; event CoinTransfer(address sender, address receiver, uint amount); function token(uint supply) { if (supply == 0) supply = 10000; coinBalanceOf[msg.sender] = supply; } function sendCoin(address receiver, uint amount) returns(bool sufficient) { if (coinBalanceOf[msg.sender] < amount) return false; coinBalanceOf[msg.sender] -= amount; coinBalanceOf[receiver] += amount; CoinTransfer(msg.sender, receiver, amount); return true; } } contract Crowdsale { address public beneficiary; uint public fundingGoal; uint public amountRaised; uint public deadline; uint public price; token public tokenReward; Funder[] public funders; event FundTransfer(address backer, uint amount, bool isContribution); struct Funder { address addr; uint amount; } /* runs on init */ function Crowdsale( address _beneficiary , uint _fundingGoal , uint _duration , uint _price , token _reward) { beneficiary = _beneficiary; fundingGoal = _fundingGoal; deadline = now + _duration * 1 minutes; price = _price; tokenReward = token(_reward); } /* the anon function is the default function called on receipt of funds */ function () { uint amount = msg.value; funders[funders.length++] = Funder({ addr: msg.sender, amount: amount }); amountRaised += amount; tokenReward.sendCoin(msg.sender, amount / price); FundTransfer(msg.sender, amount, true); } modifier afterDeadline() { if (now >= deadline) _ } function checkGoalReached() afterDeadline { if (amountRaised >= fundingGoal) { beneficiary.send(amountRaised); FundTransfer(beneficiary, amountRaised, false); } else { FundTransfer(0, 11, false); /* wat */ for (uint i = 0; i < funders.length; ++i) { funders[i].addr.send(funders[i].amount); FundTransfer(funders[i].addr, funders[i].amount, false); } } suicide(beneficiary); } }";
var crowdCompiled = eth.compile.solidity(crowdSrc);
var tokenContract = eth.contract(crowdCompiled.token.info.abiDefinition);
var token = tokenContract.new(
10000
, { from:web3.eth.accounts[0]
, data:crowdCompiled.token.code
, gas: 300000
}
, function(e, contract) {
if(!e) {
if(!contract.address) {
console.log(
"Contract transaction send: TransactionHash: " +
contract.transactionHash + " waiting to be mined...");
} else {
console.log("Contract mined! Address: " + contract.address);
console.log(contract);
}
}
})
miner.start(2);
admin.sleepBlocks(5);
miner.stop(2);
var crowdContract = eth.contract(crowdCompiled.Crowdsale.info.abiDefinition);
var _beneficiary = foo;
var _fundingGoal = parseInt(web3.toWei(100, 'ether'));
var _duration = 5;
var _price = parseInt(web3.toWei(0.02, 'ether'));
var _reward = token.address;
var crowdsale = crowdContract.new(
_beneficiary
, _fundingGoal
, _duration
, _price
, _reward
, { from: foo
, data: crowdCompiled.Crowdsale.code
, gas: 300000
}
, function(e, contract) {
if (!e) {
if (!contract.address) {
console.log(
"contract transaction send: hash " + contract.transactionHash +
" waiting to be mined.");
} else {
console.log("contract mined, address " + contract.address);
console.log(contract);
}
}});
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