all files / contracts/interfaces/ IERC3156FlashLender.sol

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// SPDX-License-Identifier: MIT
pragma solidity 0.8.6;
 
import "./IERC3156FlashBorrower.sol";
 
 
/**
 * @title IERC3156FlashLender
 * @author solace.fi
 * @notice An interface that lends flash loans per the [`EIP-3156` standard](https://eips.ethereum.org/EIPS/eip-3156).
 */
interface IERC3156FlashLender {
 
    /**
     * @dev The amount of currency available to be lended.
     * @param token The loan currency.
     * @return The amount of `token` that can be borrowed.
     */
    function maxFlashLoan(
        address token
    ) external view returns (uint256);
 
    /**
     * @dev The fee to be charged for a given loan.
     * @param token The loan currency.
     * @param amount The amount of tokens lent.
     * @return The amount of `token` to be charged for the loan, on top of the returned principal.
     */
    function flashFee(
        address token,
        uint256 amount
    ) external view returns (uint256);
 
    /**
     * @dev Initiate a flash loan.
     * @param receiver The receiver of the tokens in the loan, and the receiver of the callback.
     * @param token The loan currency.
     * @param amount The amount of tokens lent.
     * @param data Arbitrary data structure, intended to contain user-defined parameters.
     */
    function flashLoan(
        IERC3156FlashBorrower receiver,
        address token,
        uint256 amount,
        bytes calldata data
    ) external returns (bool);
}