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