chore: Component.finance, Smoothy.finance, Saddle.finance, Curve open pools, Gas schedule [TKR-1] (#182)
* chore: Component.finance, Smoothy.finance (mainnet + BSC), Saddle.finance, Curve open pools, adjusting gas schedule, fixing Shell buys * chore: adding a Sampler for Smoothy.finance to only use whats in the contracts reserve * fix: Smoothy sampler, only use approx. for buys, removing y and BUSD curve pools * add CHANGELOGs * fix: prettier * add: FRAX Curve open pool * fix: prettier * chore: adjusting gas schedule for BSC Smoothy
This commit is contained in:
Romain Butteaud
GitHub
@@ -34,6 +34,7 @@ import "./MStableSampler.sol";
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import "./MooniswapSampler.sol";
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import "./NativeOrderSampler.sol";
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import "./ShellSampler.sol";
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import "./SmoothySampler.sol";
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import "./TwoHopSampler.sol";
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import "./UniswapSampler.sol";
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import "./UniswapV2Sampler.sol";
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@@ -55,6 +56,7 @@ contract ERC20BridgeSampler is
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MultiBridgeSampler,
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NativeOrderSampler,
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ShellSampler,
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SmoothySampler,
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TwoHopSampler,
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UniswapSampler,
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UniswapV2Sampler,
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@@ -20,10 +20,20 @@
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pragma solidity ^0.6;
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pragma experimental ABIEncoderV2;
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import "./ApproximateBuys.sol";
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import "./interfaces/IShell.sol";
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import "./SamplerUtils.sol";
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contract ShellSampler
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contract ShellSampler is
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SamplerUtils,
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ApproximateBuys
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{
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struct ShellInfo {
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address poolAddress;
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}
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/// @dev Default gas limit for Shell calls.
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uint256 constant private DEFAULT_CALL_GAS = 300e3; // 300k
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@@ -56,10 +66,6 @@ contract ShellSampler
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returns (uint256 amount)
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{
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makerTokenAmounts[i] = amount;
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// Break early if there are 0 amounts
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if (makerTokenAmounts[i] == 0) {
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break;
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}
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} catch (bytes memory) {
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// Swallow failures, leaving all results as zero.
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break;
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@@ -84,26 +90,37 @@ contract ShellSampler
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view
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returns (uint256[] memory takerTokenAmounts)
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{
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// Initialize array of maker token amounts.
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uint256 numSamples = makerTokenAmounts.length;
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takerTokenAmounts = new uint256[](numSamples);
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return _sampleApproximateBuys(
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ApproximateBuyQuoteOpts({
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makerTokenData: abi.encode(makerToken, pool),
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takerTokenData: abi.encode(takerToken, pool),
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getSellQuoteCallback: _sampleSellForApproximateBuyFromShell
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}),
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makerTokenAmounts
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);
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}
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for (uint256 i = 0; i < numSamples; i++) {
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try
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IShell(pool).viewTargetSwap
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{gas: DEFAULT_CALL_GAS}
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(takerToken, makerToken, makerTokenAmounts[i])
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returns (uint256 amount)
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{
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takerTokenAmounts[i] = amount;
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// Break early if there are 0 amounts
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if (takerTokenAmounts[i] == 0) {
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break;
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}
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} catch (bytes memory) {
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// Swallow failures, leaving all results as zero.
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break;
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}
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function _sampleSellForApproximateBuyFromShell(
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bytes memory takerTokenData,
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bytes memory makerTokenData,
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uint256 sellAmount
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)
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private
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view
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returns (uint256 buyAmount)
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{
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(address takerToken, address pool) = abi.decode(takerTokenData, (address, address));
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(address makerToken) = abi.decode(makerTokenData, (address));
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try
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this.sampleSellsFromShell
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(pool, takerToken, makerToken, _toSingleValueArray(sellAmount))
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returns (uint256[] memory amounts)
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{
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return amounts[0];
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} catch (bytes memory) {
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// Swallow failures, leaving all results as zero.
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return 0;
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}
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}
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}
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156
packages/asset-swapper/contracts/src/SmoothySampler.sol
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156
packages/asset-swapper/contracts/src/SmoothySampler.sol
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@@ -0,0 +1,156 @@
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// 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/ISmoothy.sol";
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import "./ApproximateBuys.sol";
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import "./SamplerUtils.sol";
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import "./interfaces/ISmoothy.sol";
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contract SmoothySampler is
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SamplerUtils,
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ApproximateBuys
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{
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/// @dev Information for sampling from smoothy sources.
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struct SmoothyInfo {
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address poolAddress;
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bytes4 sellQuoteFunctionSelector;
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bytes4 buyQuoteFunctionSelector;
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}
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/// @dev Base gas limit for Smoothy calls.
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uint256 constant private SMOOTHY_CALL_GAS = 600e3;
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/// @dev Sample sell quotes from Smoothy.
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/// @param smoothyInfo Smoothy information specific to this token pair.
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/// @param fromTokenIdx Index of the taker token (what to sell).
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/// @param toTokenIdx Index 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 sampleSellsFromSmoothy(
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SmoothyInfo memory smoothyInfo,
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int128 fromTokenIdx,
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int128 toTokenIdx,
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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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// Basically a Curve fork
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// Smoothy only keep a percentage of its tokens available in reserve
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uint256 poolReserveMakerAmount = ISmoothy(smoothyInfo.poolAddress).getBalance(uint256(toTokenIdx)) -
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ISmoothy(smoothyInfo.poolAddress)._yBalances(uint256(toTokenIdx));
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(, , , uint256 decimals) = ISmoothy(smoothyInfo.poolAddress).getTokenStats(uint256(toTokenIdx));
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poolReserveMakerAmount = poolReserveMakerAmount/(10**(18-decimals));
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uint256 numSamples = takerTokenAmounts.length;
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makerTokenAmounts = new uint256[](numSamples);
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for (uint256 i = 0; i < numSamples; i++) {
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(bool didSucceed, bytes memory resultData) =
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smoothyInfo.poolAddress.staticcall.gas(SMOOTHY_CALL_GAS)(
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abi.encodeWithSelector(
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smoothyInfo.sellQuoteFunctionSelector,
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fromTokenIdx,
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toTokenIdx,
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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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// Make sure the quoted buyAmount is available in the pool reserve
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if (buyAmount >= poolReserveMakerAmount) {
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// Assign pool reserve amount for all higher samples to break early
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for (uint256 j = i; j < numSamples; j++) {
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makerTokenAmounts[j] = poolReserveMakerAmount;
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}
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break;
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} else {
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makerTokenAmounts[i] = buyAmount;
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}
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// Break early if there are 0 amounts
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if (makerTokenAmounts[i] == 0) {
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break;
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}
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}
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}
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/// @dev Sample buy quotes from Smoothy.
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/// @param smoothyInfo Smoothy information specific to this token pair.
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/// @param fromTokenIdx Index of the taker token (what to sell).
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/// @param toTokenIdx Index 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 sampleBuysFromSmoothy(
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SmoothyInfo memory smoothyInfo,
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int128 fromTokenIdx,
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int128 toTokenIdx,
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uint256[] memory makerTokenAmounts
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)
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public
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view
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returns (uint256[] memory takerTokenAmounts)
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{
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// Buys not supported so approximate it.
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return _sampleApproximateBuys(
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ApproximateBuyQuoteOpts({
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makerTokenData: abi.encode(toTokenIdx, smoothyInfo),
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takerTokenData: abi.encode(fromTokenIdx, smoothyInfo),
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getSellQuoteCallback: _sampleSellForApproximateBuyFromSmoothy
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}),
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makerTokenAmounts
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);
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}
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function _sampleSellForApproximateBuyFromSmoothy(
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bytes memory takerTokenData,
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bytes memory makerTokenData,
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uint256 sellAmount
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)
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private
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view
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returns (uint256 buyAmount)
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{
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(int128 takerTokenIdx, SmoothyInfo memory smoothyInfo) =
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abi.decode(takerTokenData, (int128, SmoothyInfo));
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(int128 makerTokenIdx) =
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abi.decode(makerTokenData, (int128));
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(bool success, bytes memory resultData) =
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address(this).staticcall(abi.encodeWithSelector(
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this.sampleSellsFromSmoothy.selector,
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smoothyInfo,
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takerTokenIdx,
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makerTokenIdx,
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_toSingleValueArray(sellAmount)
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));
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if (!success) {
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return 0;
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}
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// solhint-disable-next-line indent
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return abi.decode(resultData, (uint256[]))[0];
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}
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}
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45
packages/asset-swapper/contracts/src/interfaces/ISmoothy.sol
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45
packages/asset-swapper/contracts/src/interfaces/ISmoothy.sol
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@@ -0,0 +1,45 @@
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// 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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interface ISmoothy {
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function getBalance (
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uint256 tid
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)
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external
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view
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returns (uint256 balance);
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function _yBalances (
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uint256 tid
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)
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external
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view
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returns (uint256 balance);
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function getTokenStats (
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uint256 tid
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)
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external
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view
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returns (uint256 softWeight, uint256 hardWeight, uint256 balance, uint256 decimals);
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}
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