Can anyone explain me why its delegate call and not a static call ?

[DevSwayam]

Description:

There are two functions which are being called by one by one and i dont understand why one is static call and another is delegate call. Two functions :

    function getCalculatedFee(IERC20 token, uint256 amount) public view returns (uint256 fee) {
        //slither-disable-next-line divide-before-multiply
        uint256 valueOfBorrowedToken = (amount * getPriceInWeth(address(token))) / s_feePrecision;
        //slither-disable-next-line divide-before-multiply
        fee = (valueOfBorrowedToken * s_flashLoanFee) / s_feePrecision;
    }

This logs are generated while testing thunder Loan Redeem function which is

 function testRedeem() public setAllowedToken hasDeposits {
        uint256 amountToBorrow = AMOUNT * 10;
        uint256 calculatedFee = thunderLoan.getCalculatedFee(tokenA, amountToBorrow);
        /*
        vm.startPrank(user);
        tokenA.mint(address(mockFlashLoanReceiver), calculatedFee);
        thunderLoan.flashloan(address(mockFlashLoanReceiver), tokenA, amountToBorrow, "");
        vm.stopPrank();
        */
        vm.startPrank(liquidityProvider);
        thunderLoan.redeem(tokenA,type(uint256).max);
        vm.stopPrank();
    }

Proof of Logs:

[azhar0406]

You’re calling the ERC1967 proxy and to preserve the storage it will use a delegate call in the fallback function and pass it to the implementation contract.

[PatrickAlphaC]

Love this!!!