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1.5 KiB
Solidity

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (crosschain/arbitrum/CrossChainEnabledArbitrumL2.sol)
pragma solidity ^0.8.4;
import "../CrossChainEnabled.sol";
import "./LibArbitrumL2.sol";
/**
* @dev https://arbitrum.io/[Arbitrum] specialization or the
* {CrossChainEnabled} abstraction the L2 side (arbitrum).
*
* This version should only be deployed on L2 to process cross-chain messages
* originating from L1. For the other side, use {CrossChainEnabledArbitrumL1}.
*
* Arbitrum L2 includes the `ArbSys` contract at a fixed address. Therefore,
* this specialization of {CrossChainEnabled} does not include a constructor.
*
* _Available since v4.6._
*
* WARNING: There is currently a bug in Arbitrum that causes this contract to
* fail to detect cross-chain calls when deployed behind a proxy. This will be
* fixed when the network is upgraded to Arbitrum Nitro, currently scheduled for
* August 31st 2022.
*/
abstract contract CrossChainEnabledArbitrumL2 is CrossChainEnabled {
/**
* @dev see {CrossChainEnabled-_isCrossChain}
*/
function _isCrossChain() internal view virtual override returns (bool) {
return LibArbitrumL2.isCrossChain(LibArbitrumL2.ARBSYS);
}
/**
* @dev see {CrossChainEnabled-_crossChainSender}
*/
function _crossChainSender() internal view virtual override onlyCrossChain returns (address) {
return LibArbitrumL2.crossChainSender(LibArbitrumL2.ARBSYS);
}
}