How to calculate "sqrtPriceLimitX96" in production?

Question

I have the following code to swap tokenA with tokenB using the Uniswap V3 exactInputSingle function:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@uniswap/v3-periphery/contracts/interfaces/ISwapRouter.sol";
import "@uniswap/v3-periphery/contracts/libraries/TransferHelper.sol";
contract ExampleSwap {
    address private constant SWAP_ROUTER = 0xE592427A0AEce92De3Edee1F18E0157C05861564;
    ISwapRouter immutable swapRouter = ISwapRouter(SWAP_ROUTER);
function swapOnUniswap(address tokenA, address tokenB, uint amountIn, uint24 _poolFee, uint _amountOutMinimum, uint160 _sqrtPriceLimitX96) public {
   require(amountIn>0, "amountIn can't be zero");
   require(IERC20(tokenA).transferFrom(msg.sender, address(this), amountIn), "transferFrom failed.");
   require(IERC20(tokenA).approve(address(swapRouter), amountIn), "approve failed.");

   ISwapRouter.ExactInputSingleParams memory params =
       ISwapRouter.ExactInputSingleParams({
           tokenIn: tokenA,
           tokenOut: tokenB,
           fee: _poolFee,
           recipient: address(this),
           deadline: block.timestamp,
           amountIn: amountIn,
           amountOutMinimum: _amountOutMinimum,
           sqrtPriceLimitX96: _sqrtPriceLimitX96
       });

   uint amountOut = swapRouter.exactInputSingle(params);

}
}

How to calculate sqrtPriceLimitX96 so that it can be passed as argument while interacting with the swapOnUniswap function?

Answer 1

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