Reformat and remove redundant @dev notices
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evm/src/interfaces/ISwapAdapter.sol
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104
evm/src/interfaces/ISwapAdapter.sol
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// SPDX-License-Identifier: AGPL-3.0-or-later
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pragma solidity ^0.8.13;
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import "openzeppelin-contracts/contracts/interfaces/IERC20.sol";
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import "interfaces/ISwapAdapterTypes.sol";
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/// @title ISwapAdapterTypes
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/// @dev Implement this interface to support propeller routing through your
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/// pairs. Before implementing the interface we need to introduce three function
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/// for a given pair: The swap(x), gas(x) and price(x) functions: The swap
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/// function accepts some specified token amount: x and returns the amount y a
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/// user can get by swapping x through the venue. The gas function simply
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/// returns the estimated gas cost given a specified amount x. Last but not
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/// least, the price function is the derivative of the swap function. It
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/// represents the best possible price a user can get from a pair after swapping
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/// x of the specified token. During calls to swap and getLimits, the caller can
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/// be assumed to have the required sell or buy token balance as well as
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/// unlimited approvals to this contract.
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interface ISwapAdapter is ISwapAdapterTypes {
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/// @notice Calculates pair prices for specified amounts (optional).
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/// @dev The returned prices should include all dex fees, in case the fee is
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/// dynamic, the returned price is expected to include the minimum fee.
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/// Ideally this method should be implemented, although it is optional as
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/// the price function can be numerically estimated from the swap function.
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/// In case it is not available it should be flagged via capabilities and
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/// calling it should revert using the `NotImplemented` error. The method
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/// needs to be implemented as view as this is usually more efficient and
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/// can be run in parallel. all.
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/// @param pairId The ID of the trading pair.
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/// @param sellToken The token being sold.
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/// @param buyToken The token being bought.
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/// @param sellAmounts The specified amounts used for price calculation.
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/// @return prices array of prices as fractions corresponding to the
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/// provided amounts.
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function price(
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bytes32 pairId,
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IERC20 sellToken,
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IERC20 buyToken,
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uint256[] memory sellAmounts
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) external view returns (Fraction[] memory prices);
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/**
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* @notice Simulates swapping tokens on a given pair.
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* @dev This function should be state modifying meaning it should actually
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* execute the swap and change the state of the evm accordingly. Please
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* include a gas usage estimate for each amount. This can be achieved e.g.
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* by using the `gasleft()` function. The return type trade, has a price
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* attribute which should contain the value of `price(specifiedAmount)`. As
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* this is optional, defined via `Capability.PriceFunction`, it is valid to
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* return a zero value for this price in that case it will be estimated
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* numerically. To return zero use Fraction(0, 1).
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* @param pairId The ID of the trading pair.
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* @param sellToken The token being sold.
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* @param buyToken The token being bought.
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* @param side The side of the trade (Sell or Buy).
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* @param specifiedAmount The amount to be traded.
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* @return trade Trade struct representing the executed trade.
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*/
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function swap(
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bytes32 pairId,
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IERC20 sellToken,
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IERC20 buyToken,
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SwapSide side,
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uint256 specifiedAmount
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) external returns (Trade memory trade);
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/// @notice Retrieves the limits for each token.
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/// @dev Retrieve the maximum limits of a token that can be traded. The
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/// limit is reached when the change in the received amounts is zero or
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/// close to zero. If in doubt over estimate. The swap function should not
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/// error with `LimitExceeded` if called with amounts below the limit.
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/// @param pairId The ID of the trading pair.
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/// @return An array of limits.
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function getLimits(bytes32 pairId, SwapSide side)
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external
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returns (uint256[] memory);
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/// @notice Retrieves the capabilities of the selected pair.
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/// @param pairId The ID of the trading pair.
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/// @return An array of Capabilities.
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function getCapabilities(bytes32 pairId, IERC20 sellToken, IERC20 buyToken)
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external
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returns (Capabilities[] memory);
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/// @notice Retrieves the tokens in the selected pair.
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/// @dev Mainly used for testing as this is redundant with the required
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/// substreams implementation.
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/// @param pairId The ID of the trading pair.
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/// @return tokens array of IERC20 contracts.
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function getTokens(bytes32 pairId)
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external
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returns (IERC20[] memory tokens);
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/// @notice Retrieves a range of pool IDs.
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/// @dev Mainly used for testing it is alright to not return all available
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/// pools here. Nevertheless this is useful to test against the substreams
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/// implementation. If implemented it safes time writing custom tests.
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/// @param offset The starting index from which to retrieve pool IDs.
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/// @param limit The maximum number of pool IDs to retrieve.
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/// @return ids array of pool IDs.
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function getPoolIds(uint256 offset, uint256 limit)
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external
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returns (bytes32[] memory ids);
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}
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