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L2ArbitrumMessenger.sol
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L2ArbitrumMessenger.sol
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// SPDX-License-Identifier: Apache-2.0
/*
* Copyright 2020, Offchain Labs, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
pragma solidity ^0.8.0;
import "@arbitrum/nitro-contracts/src/precompiles/ArbSys.sol";
/// @notice L2 utility contract to assist with L1 <=> L2 interactions
/// @dev this is an abstract contract instead of library so the functions can be easily overriden when testing
abstract contract L2ArbitrumMessenger {
address internal constant ARB_SYS_ADDRESS = address(100);
event TxToL1(address indexed _from, address indexed _to, uint256 indexed _id, bytes _data);
function sendTxToL1(
uint256 _l1CallValue,
address _from,
address _to,
bytes memory _data
) internal returns (uint256) {
uint256 _id = ArbSys(ARB_SYS_ADDRESS).sendTxToL1{ value: _l1CallValue }(_to, _data);
emit TxToL1(_from, _to, _id, _data);
return _id;
}
}