874c2d3c02
Co-authored-by: Hadrien Croubois <hadrien.croubois@gmail.com> Co-authored-by: ernestognw <ernestognw@gmail.com>
41 lines
1.4 KiB
Solidity
41 lines
1.4 KiB
Solidity
// SPDX-License-Identifier: MIT
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// OpenZeppelin Contracts (last updated v4.7.0) (proxy/beacon/BeaconProxy.sol)
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pragma solidity ^0.8.19;
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import {IBeacon} from "./IBeacon.sol";
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import {Proxy} from "../Proxy.sol";
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import {ERC1967Utils} from "../ERC1967/ERC1967Utils.sol";
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/**
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* @dev This contract implements a proxy that gets the implementation address for each call from an {UpgradeableBeacon}.
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*
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* The beacon address is stored in storage slot `uint256(keccak256('eip1967.proxy.beacon')) - 1`, so that it doesn't
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* conflict with the storage layout of the implementation behind the proxy.
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*
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* _Available since v3.4._
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*/
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contract BeaconProxy is Proxy {
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/**
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* @dev Initializes the proxy with `beacon`.
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*
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* If `data` is nonempty, it's used as data in a delegate call to the implementation returned by the beacon. This
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* will typically be an encoded function call, and allows initializing the storage of the proxy like a Solidity
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* constructor.
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*
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* Requirements:
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*
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* - `beacon` must be a contract with the interface {IBeacon}.
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*/
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constructor(address beacon, bytes memory data) payable {
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ERC1967Utils.upgradeBeaconToAndCall(beacon, data, false);
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}
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/**
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* @dev Returns the current implementation address of the associated beacon.
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*/
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function _implementation() internal view virtual override returns (address) {
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return IBeacon(ERC1967Utils.getBeacon()).implementation();
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}
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}
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