CurveSwapper

Git Source

Inherits: ERC20Selectors, Masks

Title: Curve swapper contract

We do Curve stuff here

State Variables

CALL_MANAGEMENT_APPROVALS

bytes32 private constant CALL_MANAGEMENT_APPROVALS = 0x1aae13105d9b6581c36534caba5708726e5ea1e03175e823c989a5756966d1f3

EXCHANGE_INT

Standard curve pool selectors

selector exchange(int128,int128,uint256,uint256)

bytes32 private constant EXCHANGE_INT = 0x3df0212400000000000000000000000000000000000000000000000000000000

EXCHANGE_INT_WITH_RECEIVER

selector exchange(int128,int128,uint256,uint256,address)

bytes32 private constant EXCHANGE_INT_WITH_RECEIVER = 0xddc1f59d00000000000000000000000000000000000000000000000000000000

EXCHANGE

selector exchange(uint256,uint256,uint256,uint256)

bytes32 private constant EXCHANGE = 0x5b41b90800000000000000000000000000000000000000000000000000000000

EXCHANGE_WITH_RECEIVER

selector exchange(uint256,uint256,uint256,uint256,address)

bytes32 private constant EXCHANGE_WITH_RECEIVER = 0xa64833a000000000000000000000000000000000000000000000000000000000

EXCHANGE_UNDERLYING

selector exchange_underlying(uint256,uint256,uint256,uint256)

bytes32 private constant EXCHANGE_UNDERLYING = 0x65b2489b00000000000000000000000000000000000000000000000000000000

EXCHANGE_UNDERLYING_WITH_RECEIVER

selector exchange_underlying(uint256,uint256,uint256,uint256,address)

bytes32 private constant EXCHANGE_UNDERLYING_WITH_RECEIVER =
    0xe2ad025a00000000000000000000000000000000000000000000000000000000

EXCHANGE_UNDERLYING_INT

selector exchange_underlying(uint256,uint256,uint256,uint256)

bytes32 private constant EXCHANGE_UNDERLYING_INT = 0xa6417ed600000000000000000000000000000000000000000000000000000000

EXCHANGE_UNDERLYING_INT_WITH_RECEIVER

selector exchange_underlying(uint256,uint256,uint256,uint256,address)

bytes32 private constant EXCHANGE_UNDERLYING_INT_WITH_RECEIVER =
    0x44ee198600000000000000000000000000000000000000000000000000000000

EXCHANGE_RECEIVED

selector exchange_received(uint256,uint256,uint256,uint256)

bytes32 private constant EXCHANGE_RECEIVED = 0x29b244bb00000000000000000000000000000000000000000000000000000000

EXCHANGE_RECEIVED_WITH_RECEIVER

selector exchange_received(uint256,uint256,uint256,uint256,address)

bytes32 private constant EXCHANGE_RECEIVED_WITH_RECEIVER = 0x767691e700000000000000000000000000000000000000000000000000000000

EXCHANGE_RECEIVED_INT

selector exchange(int128,int128,uint256,uint256)

bytes32 private constant EXCHANGE_RECEIVED_INT = 0x7e3db03000000000000000000000000000000000000000000000000000000000

EXCHANGE_RECEIVED_INT_WITH_RECEIVER

selector exchange_received(int128,int128,uint256,uint256,address)

bytes32 private constant EXCHANGE_RECEIVED_INT_WITH_RECEIVER =
    0xafb4301200000000000000000000000000000000000000000000000000000000

SWAP

selector for Curve forks using solidity swap(uint8,uint8,uint256,uint256,uint256)

bytes32 private constant SWAP = 0x9169558600000000000000000000000000000000000000000000000000000000

Functions

_fundAndApproveIfNeeded

function _fundAndApproveIfNeeded(
    address callerAddress,
    address tokenIn,
    uint256 amount,
    uint256 data
)
    private
    returns (address pool);

_swapCurveGeneral

Swaps using a standard curve pool

Data is supposed to be packed as follows: tokenIn | actionId | dexId | pool | i | j | sm | tokenOut. sm is the selector, i,j are the swap indexes for the pool. Pay mode: 0 = pay from self; 1 = caller pays; 3 = pre-funded.

Note: calldata-offset-table:

function _swapCurveGeneral(
    address tokenIn,
    address tokenOut,
    uint256 amountIn,
    address receiver, //
    address callerAddress,
    uint256 currentOffset
)
    internal
    returns (
        uint256 amountOut,
        // curve data is a transient memory variable to
        // avoid stack too deep errors
        uint256 curveData
    );

Parameters

Returns

_swapCurveFork

Swaps using a standard curve fork pool

Data is supposed to be packed as follows: tokenIn | actionId | dexId | pool | i | j | sm | tokenOut. sm is the selector, i,j are the swap indexes for the pool. Pay mode: 0 = pay from self; 1 = caller pays; 3 = pre-funded.

Note: calldata-offset-table:

function _swapCurveFork(
    address tokenIn,
    address tokenOut,
    uint256 amountIn,
    address receiver, //
    address callerAddress,
    uint256 currentOffset
)
    internal
    returns (
        uint256 amountOut,
        // curve data is a transient memory variable to
        // avoid stack too deep errors
        uint256 curveData
    );

Parameters

Returns

_swapCurveReceived

Swaps using a NG pool that allows for pre-funded swaps

Data is supposed to be packed as follows: tokenIn | actionId | dexId | pool | sm | i | j | tokenOut. sm is the selector, i,j are the swap indexes for the pool. Pay mode: 0 = pay from self; 1 = caller pays; 3 = pre-funded.

Note: calldata-offset-table:

function _swapCurveReceived(
    address tokenIn,
    uint256 amountIn,
    address receiver, //
    address callerAddress,
    uint256 currentOffset
)
    internal
    returns (
        // assign payFlag then amountOut
        uint256 payFlagAmountOut,
        uint256 curveData
    );

Parameters

Returns