83 lines
2.8 KiB
Solidity
83 lines
2.8 KiB
Solidity
// SPDX-License-Identifier: Apache-2.0
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/*
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Copyright 2020 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 "./interfaces/IMultiBridge.sol";
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contract MultiBridgeSampler {
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/// @dev Default gas limit for multibridge calls.
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uint256 constant private DEFAULT_CALL_GAS = 400e3; // 400k
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/// @dev Sample sell quotes from MultiBridge.
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/// @param multibridge Address of the MultiBridge contract.
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/// @param takerToken Address of the taker token (what to sell).
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/// @param intermediateToken The address of the intermediate token to
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/// use in an indirect route.
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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 sampleSellsFromMultiBridge(
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address multibridge,
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address takerToken,
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address intermediateToken,
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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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view
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returns (uint256[] memory makerTokenAmounts)
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{
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// Initialize array of maker token amounts.
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uint256 numSamples = takerTokenAmounts.length;
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makerTokenAmounts = new uint256[](numSamples);
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// If no address provided, return all zeros.
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if (multibridge == address(0)) {
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return makerTokenAmounts;
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}
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for (uint256 i = 0; i < numSamples; i++) {
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(bool didSucceed, bytes memory resultData) =
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multibridge.staticcall.gas(DEFAULT_CALL_GAS)(
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abi.encodeWithSelector(
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IMultiBridge(0).getSellQuote.selector,
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takerToken,
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intermediateToken,
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makerToken,
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takerTokenAmounts[i]
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));
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uint256 buyAmount = 0;
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if (didSucceed) {
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buyAmount = abi.decode(resultData, (uint256));
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}
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// Exit early if the amount is too high for the source to serve
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if (buyAmount == 0) {
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break;
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}
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makerTokenAmounts[i] = buyAmount;
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}
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}
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}
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