I have two Solidity contracts, where contract Caller depends on a second contract Callee. Contract Callee provides a public view function which checks the validity of a string (e.g. an password), according to some internal rules. Caller needs to check a string in its own function by calling Callee, before he can further process. Furthermore Caller needs to call the function of Callee by using delegatecall, because the internal validity check considers the calling address.
contract Caller {
function doSomething(string _text, address _callee) public {
bool valid = bool(_callee.delegatecall(
bytes4(keccak256("check(string _text)")), _text)
);
require(valid == true);
/* further process if text is valid */
}
}
contract Callee {
function check(string _text) public view returns(bool){
/* validity check */
return true;
}
}
The problem with this code is, that the call of function check seems to be asynchronous and therefore the require statement in function doSomething will always fail. Is this a problem of delegatecall? Is there a way to call the external function synchronously?
