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* Curve ERC20Bridge * ERC20BridgeSampler Curve (#2483) * ERC20Sampler Curve * Use Bridge Sources for each Curve * Support multiple versions of the Curve contract * CHANGELOG and redeployed Curve (mainnet) * Fix Market ops utils test * Added Curve DAI USDC USDT TUSD * Bump sampler gas limit default * Decode the Curve in tests * Disable Curve in Buy tests * blockchainTests.fork.resets Curve and Sampler
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contracts/asset-proxy/contracts/src/bridges/CurveBridge.sol
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| /* | ||
| Copyright 2019 ZeroEx Intl. | ||
| 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. | ||
| */ | ||
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| pragma solidity ^0.5.9; | ||
| pragma experimental ABIEncoderV2; | ||
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| import "@0x/contracts-erc20/contracts/src/interfaces/IERC20Token.sol"; | ||
| import "@0x/contracts-erc20/contracts/src/LibERC20Token.sol"; | ||
| import "@0x/contracts-exchange-libs/contracts/src/IWallet.sol"; | ||
| import "@0x/contracts-utils/contracts/src/DeploymentConstants.sol"; | ||
| import "../interfaces/IERC20Bridge.sol"; | ||
| import "../interfaces/ICurve.sol"; | ||
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| // solhint-disable not-rely-on-time | ||
| // solhint-disable space-after-comma | ||
| contract CurveBridge is | ||
| IERC20Bridge, | ||
| IWallet, | ||
| DeploymentConstants | ||
| { | ||
| /// @dev Callback for `ICurve`. Tries to buy `amount` of | ||
| /// `toTokenAddress` tokens by selling the entirety of the opposing asset | ||
| /// (DAI, USDC) to the Curve contract, then transfers the bought | ||
| /// tokens to `to`. | ||
| /// @param toTokenAddress The token to give to `to` (i.e DAI, USDC, USDT). | ||
| /// @param to The recipient of the bought tokens. | ||
| /// @param amount Minimum amount of `toTokenAddress` tokens to buy. | ||
| /// @param bridgeData The abi-encoeded "from" token address. | ||
| /// @return success The magic bytes if successful. | ||
| function bridgeTransferFrom( | ||
| address toTokenAddress, | ||
| address /* from */, | ||
| address to, | ||
| uint256 amount, | ||
| bytes calldata bridgeData | ||
| ) | ||
| external | ||
| returns (bytes4 success) | ||
| { | ||
| // Decode the bridge data to get the Curve metadata. | ||
| (address curveAddress, int128 fromCoinIdx, int128 toCoinIdx, int128 version) = abi.decode(bridgeData, (address, int128, int128, int128)); | ||
| ICurve exchange = ICurve(curveAddress); | ||
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| address fromTokenAddress = exchange.underlying_coins(fromCoinIdx); | ||
| require(toTokenAddress != fromTokenAddress, "CurveBridge/INVALID_PAIR"); | ||
| // Grant an allowance to the exchange to spend `fromTokenAddress` token. | ||
| LibERC20Token.approve(fromTokenAddress, address(exchange), uint256(-1)); | ||
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| // Try to sell all of this contract's `fromTokenAddress` token balance. | ||
| if (version == 0) { | ||
| exchange.exchange_underlying( | ||
| fromCoinIdx, | ||
| toCoinIdx, | ||
| // dx | ||
| IERC20Token(fromTokenAddress).balanceOf(address(this)), | ||
| // min dy | ||
| amount, | ||
| // expires | ||
| block.timestamp + 1 | ||
| ); | ||
| } else { | ||
| exchange.exchange_underlying( | ||
| fromCoinIdx, | ||
| toCoinIdx, | ||
| // dx | ||
| IERC20Token(fromTokenAddress).balanceOf(address(this)), | ||
| // min dy | ||
| amount | ||
| ); | ||
| } | ||
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| uint256 toTokenBalance = IERC20Token(toTokenAddress).balanceOf(address(this)); | ||
| // Transfer the converted `toToken`s to `to`. | ||
| LibERC20Token.transfer(toTokenAddress, to, toTokenBalance); | ||
| return BRIDGE_SUCCESS; | ||
| } | ||
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| /// @dev `SignatureType.Wallet` callback, so that this bridge can be the maker | ||
| /// and sign for itself in orders. Always succeeds. | ||
| /// @return magicValue Magic success bytes, always. | ||
| function isValidSignature( | ||
| bytes32, | ||
| bytes calldata | ||
| ) | ||
| external | ||
| view | ||
| returns (bytes4 magicValue) | ||
| { | ||
| return LEGACY_WALLET_MAGIC_VALUE; | ||
| } | ||
| } |
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| /* | ||
| Copyright 2019 ZeroEx Intl. | ||
| 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. | ||
| */ | ||
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| pragma solidity ^0.5.9; | ||
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| // solhint-disable func-name-mixedcase | ||
| interface ICurve { | ||
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| /// @dev Sell `sellAmount` of `fromToken` token and receive `toToken` token. | ||
| /// This function exists on early versions of Curve (USDC/DAI) | ||
| /// @param i The token index being sold. | ||
| /// @param j The token index being bought. | ||
| /// @param sellAmount The amount of token being bought. | ||
| /// @param minBuyAmount The minimum buy amount of the token being bought. | ||
| /// @param deadline The time in seconds when this operation should expire. | ||
| function exchange_underlying( | ||
| int128 i, | ||
| int128 j, | ||
| uint256 sellAmount, | ||
| uint256 minBuyAmount, | ||
| uint256 deadline | ||
| ) | ||
| external; | ||
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| /// @dev Sell `sellAmount` of `fromToken` token and receive `toToken` token. | ||
| /// This function exists on later versions of Curve (USDC/DAI/USDT) | ||
| /// @param i The token index being sold. | ||
| /// @param j The token index being bought. | ||
| /// @param sellAmount The amount of token being bought. | ||
| /// @param minBuyAmount The minimum buy amount of the token being bought. | ||
| function exchange_underlying( | ||
| int128 i, | ||
| int128 j, | ||
| uint256 sellAmount, | ||
| uint256 minBuyAmount | ||
| ) | ||
| external; | ||
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| /// @dev Get the amount of `toToken` by selling `sellAmount` of `fromToken` | ||
| /// @param i The token index being sold. | ||
| /// @param j The token index being bought. | ||
| /// @param sellAmount The amount of token being bought. | ||
| function get_dy_underlying( | ||
| int128 i, | ||
| int128 j, | ||
| uint256 sellAmount | ||
| ) | ||
| external | ||
| returns (uint256 dy); | ||
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| /// @dev Get the amount of `fromToken` by buying `buyAmount` of `toToken` | ||
| /// This function exists on later versions of Curve (USDC/DAI/USDT) | ||
| /// @param i The token index being sold. | ||
| /// @param j The token index being bought. | ||
| /// @param buyAmount The amount of token being bought. | ||
| function get_dx_underlying( | ||
| int128 i, | ||
| int128 j, | ||
| uint256 buyAmount | ||
| ) | ||
| external | ||
| returns (uint256 dx); | ||
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| /// @dev Get the underlying token address from the token index | ||
| /// @param i The token index. | ||
| function underlying_coins( | ||
| int128 i | ||
| ) | ||
| external | ||
| returns (address tokenAddress); | ||
| } |
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