Kim Persson
7580719586
* feat: initial stab at the LidoSampler and the MixinLido * feat: full integration of lido sampler and mixin * fix: return pooled Ether amount not shares & properly unwrap WETH * refactor: clean up Lido sampler and data passing * fix: lower gas schedule for WETH to stETH deposits * refactor: remove MixinLido unused ETH code path * chore: add changelog entries * fix: lower Lido gas schedule slightly * fix: revert MixinLido on unsupported token pair * fix: address review comments, improve early exit if wrong tokens * fix: add contract addresses to Lido FQT
92 lines
3.1 KiB
Solidity
92 lines
3.1 KiB
Solidity
// SPDX-License-Identifier: Apache-2.0
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/*
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Copyright 2021 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 ^0.6;
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pragma experimental ABIEncoderV2;
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import "./SamplerUtils.sol";
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contract LidoSampler is SamplerUtils {
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struct LidoInfo {
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address stEthToken;
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address wethToken;
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}
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/// @dev Sample sell quotes from Lido
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/// @param lidoInfo Info regarding a specific Lido deployment
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/// @param takerToken Address of the taker token (what to sell).
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/// @param makerToken Address of the maker token (what to buy).
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/// @param takerTokenAmounts Taker token sell amount for each sample.
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/// @return makerTokenAmounts Maker amounts bought at each taker token
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/// amount.
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function sampleSellsFromLido(
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LidoInfo memory lidoInfo,
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address takerToken,
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address makerToken,
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uint256[] memory takerTokenAmounts
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)
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public
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pure
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returns (uint256[] memory)
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{
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_assertValidPair(makerToken, takerToken);
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if (takerToken != lidoInfo.wethToken || makerToken != address(lidoInfo.stEthToken)) {
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// Return 0 values if not selling WETH for stETH
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uint256 numSamples = takerTokenAmounts.length;
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uint256[] memory makerTokenAmounts = new uint256[](numSamples);
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return makerTokenAmounts;
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}
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// Minting stETH is always 1:1 therefore we can just return the same amounts back
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return takerTokenAmounts;
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}
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/// @dev Sample buy quotes from Lido.
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/// @param lidoInfo Info regarding a specific Lido deployment
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/// @param takerToken Address of the taker token (what to sell).
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/// @param makerToken Address of the maker token (what to buy).
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/// @param makerTokenAmounts Maker token buy amount for each sample.
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/// @return takerTokenAmounts Taker amounts sold at each maker token
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/// amount.
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function sampleBuysFromLido(
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LidoInfo memory lidoInfo,
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address takerToken,
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address makerToken,
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uint256[] memory makerTokenAmounts
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)
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public
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pure
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returns (uint256[] memory)
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{
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_assertValidPair(makerToken, takerToken);
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if (takerToken != lidoInfo.wethToken || makerToken != address(lidoInfo.stEthToken)) {
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// Return 0 values if not buying stETH for WETH
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uint256 numSamples = makerTokenAmounts.length;
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uint256[] memory takerTokenAmounts = new uint256[](numSamples);
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return takerTokenAmounts;
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}
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// Minting stETH is always 1:1 therefore we can just return the same amounts back
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return makerTokenAmounts;
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}
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}
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