568e9be07e
* Gas Tokens in Bridges * Added freesGasTokensFromCollector. To handle the case where GST2 is being traded and the balanceOf checks become confusing * Update CHANGELOGs
56 lines
1.8 KiB
Solidity
56 lines
1.8 KiB
Solidity
/*
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Copyright 2019 ZeroEx Intl.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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pragma solidity ^0.5.16;
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import "@0x/contracts-utils/contracts/src/DeploymentConstants.sol";
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import "../interfaces/IGasToken.sol";
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contract MixinGasToken is
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DeploymentConstants
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{
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/// @dev Frees gas tokens based on the amount of gas consumed in the function
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modifier freesGasTokens {
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uint256 gasBefore = gasleft();
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_;
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IGasToken gst = IGasToken(_getGstAddress());
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if (address(gst) != address(0)) {
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// (gasUsed + FREE_BASE) / (2 * REIMBURSE - FREE_TOKEN)
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// 14154 24000 6870
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uint256 value = (gasBefore - gasleft() + 14154) / 41130;
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gst.freeUpTo(value);
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}
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}
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/// @dev Frees gas tokens using the balance of `from`. Amount freed is based
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/// on the gas consumed in the function
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modifier freesGasTokensFromCollector() {
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uint256 gasBefore = gasleft();
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_;
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IGasToken gst = IGasToken(_getGstAddress());
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if (address(gst) != address(0)) {
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// (gasUsed + FREE_BASE) / (2 * REIMBURSE - FREE_TOKEN)
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// 14154 24000 6870
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uint256 value = (gasBefore - gasleft() + 14154) / 41130;
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gst.freeFromUpTo(_getGstCollectorAddress(), value);
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}
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}
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}
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