Solidity Bad Practices: Hardcoded Gas Amount

The contract defines a fixed amount of gas or invokes a function with a fixed amount of gas.

The transaction cost in terms of gas can vary based on current network conditions, for example, the gas cost of EVM (Ethereum Virtual Machine) instructions during a hard fork might significantly be affected. This can break existing functionality that relies on fixed amounts of gas or can affect transactions utilized for value transfer such as transfer() and send(), which use a fixed amount of 2300 gas.

Example 1: The following code carries out a call and specifies a fixed amount of gas.

interface ICallable {
    function callMe() external;
}

contract HardcodedNotGood {
    function callWithArgs() public {
        callable.callMe{gas: 10000}();
    }
}