AntePool.sol

// SPDX-License-Identifier: GPL-3.0-only

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pragma solidity ^0.8.0;

import "@openzeppelin/contracts/proxy/Proxy.sol";
import "@openzeppelin/contracts/utils/Address.sol";
import "./libraries/StorageSlot.sol";

/// @title Ante V0.6 Ante Pool Proxy smart contract
contract AntePool is Proxy {
    /// @dev Storage slot with the address of the current implementation.
    /// This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1
    bytes32 internal constant _IMPLEMENTATION_SLOT = bytes32(uint256(keccak256("eip1967.proxy.implementation")) - 1);

    /// @param _antePoolLogicAddr The address where the implementation contract is deployed
    constructor(address _antePoolLogicAddr) {
        require(Address.isContract(_antePoolLogicAddr), "ANTE: implementation is not a contract");
        StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = _antePoolLogicAddr;
    }

    /// @inheritdoc Proxy
    function _implementation() internal view override returns (address) {
        return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }
}