I am trying to deploy a contract from another factory contract and then return the address of the newly created contract. The address it returns however is the transaction hash not the contract address. I believe this is because the contract is not yet mined when the address is returned. When I deploy a contract using the web3 deploy it seems to wait until the contract is deployed before outputting the address.
The factory contract:
contract Factory {
mapping(uint256 => Contract) deployedContracts;
uint256 numContracts;
function Factory(){
numContracts = 0;
}
function createContract (uint32 name) returns (address){
deployedContracts[numContracts] = new Contract(name);
numContracts++;
return deployedContracts[numContracts];
}}
This is how I am calling the createContract function.
factory.createContract(2,function(err, res){
if (err){
console.log(err)
}else{
console.log(res)
}
});
Consider the below example. There are a number of ways you can get the address of the contract:
contract Object {
string name;
function Object(String _name) {
name = _name
}
}
contract ObjectFactory {
function createObject(string name) returns (address objectAddress) {
return address(new Object(name));
}
}
Store the address in the contract as an attribute and retrieve it using a normal getter method.
contract ObjectFactory {
Object public theObj;
function createObject(string name) returns (address objectAddress) {
theObj = address(new Object(name));
return theObj;
}
}
Call
Before You Make A TransactionYou can make a call
before you make a transaction:
var address = web3.eth.contract(objectFactoryAbi)
.at(contractFactoryAddress)
.createObject.call("object");
Once you have the address perform the transaction:
var txHash = web3.eth.contract(objectFactoryAbi)
.at(contractFactoryAddress)
.createObject("object", { gas: price, from: accountAddress });
Otherwise, you can calculate the address of the future contract like so:
var ethJsUtil = require('ethereumjs-util');
var futureAddress = ethJsUtil.bufferToHex(ethJsUtil.generateAddress(
contractFactoryAddress,
await web3.eth.getTransactionCount(contractFactoryAddress)));