Crane Uniswap Integration

Crane provides Uniswap V2, V3, and V4 integration with services, stubs, libraries, and test infrastructure.

Components

Component	Location	Purpose
`UniswapV2Service`	`v2/services/UniswapV2Service.sol`	V2 swap, deposit, withdraw operations
`UniswapV2RouterAwareRepo`	`v2/aware/UniswapV2RouterAwareRepo.sol`	Router dependency injection
`UniswapV2FactoryAwareRepo`	`v2/aware/UniswapV2FactoryAwareRepo.sol`	Factory dependency injection
`TestBase_UniswapV2`	`v2/test/bases/TestBase_UniswapV2.sol`	Full protocol deployment
`TestBase_UniswapV2_Pools`	`v2/test/bases/TestBase_UniswapV2_Pools.sol`	Pool creation helpers
`UniswapV3Factory`	`v3/UniswapV3Factory.sol`	V3 factory stub
`UniswapV3Pool`	`v3/UniswapV3Pool.sol`	V3 pool implementation
`UniswapV4Utils`	`v4/utils/UniswapV4Utils.sol`	V4 utility functions
`UniswapV4Quoter`	`v4/utils/UniswapV4Quoter.sol`	V4 quote calculations

Uniswap V2 (Standard 0.3% Fee)

Unlike Camelot's directional fees, Uniswap V2 uses a fixed 0.3% fee:

solidity

// UniswapV2Service always uses 300 (0.3%) for fee calculations
feePercent = 300;

Quick Start: Execute V2 Swap

solidity

import {UniswapV2Service} from "@crane/contracts/protocols/dexes/uniswap/v2/services/UniswapV2Service.sol";
import {IUniswapV2Router} from "@crane/contracts/interfaces/protocols/dexes/uniswap/v2/IUniswapV2Router.sol";
import {IUniswapV2Pair} from "@crane/contracts/interfaces/protocols/dexes/uniswap/v2/IUniswapV2Pair.sol";

contract UniswapSwapper {
    IUniswapV2Router public router;

    function swap(
        IUniswapV2Pair pool,
        IERC20 tokenIn,
        IERC20 tokenOut,
        uint256 amountIn
    ) external returns (uint256 amountOut) {
        tokenIn.transferFrom(msg.sender, address(this), amountIn);

        amountOut = UniswapV2Service._swap(
            router,
            pool,
            amountIn,
            tokenIn,
            tokenOut
        );
    }
}

V2 Service Operations

Deposit (Add Liquidity)

solidity

function _deposit(
    IUniswapV2Router router,
    IERC20 tokenA,
    IERC20 tokenB,
    uint256 amountADesired,
    uint256 amountBDesired
) internal returns (uint256 liquidity);

Withdraw (Remove Liquidity)

solidity

function _withdrawDirect(
    IUniswapV2Pair pool,
    uint256 amt
) internal returns (uint256 amount0, uint256 amount1);

Swap

solidity

// Swap with pool auto-detection
function _swap(
    IUniswapV2Router router,
    IUniswapV2Pair pool,
    uint256 amountIn,
    IERC20 tokenIn,
    IERC20 tokenOut
) internal returns (uint256 amountOut);

// Swap exact tokens for tokens
function _swapExactTokensForTokens(
    IUniswapV2Router router,
    IERC20 tokenIn,
    uint256 amountIn,
    IERC20 tokenOut,
    uint256 minAmountOut,
    address recipient
) internal returns (uint256 amountOut);

// Swap tokens for exact tokens
function _swapTokensForExactTokens(
    IUniswapV2Router router,
    IERC20 tokenIn,
    uint256 amountInMax,
    IERC20 tokenOut,
    uint256 amountOut,
    address recipient
) internal returns (uint256 amountIn);

Swap and Deposit (Zap In)

solidity

function _swapDeposit(
    IUniswapV2Router router,
    IUniswapV2Pair pool,
    IERC20 tokenIn,
    uint256 saleAmt,
    IERC20 opToken
) internal returns (uint256 lpAmount);

Withdraw and Swap (Zap Out)

solidity

function _withdrawSwapDirect(
    IUniswapV2Pair pool,
    IUniswapV2Router router,
    uint256 amt,
    IERC20 tokenOut,
    IERC20 opToken
) internal returns (uint256 amountOut);

Reserve Sorting

solidity

(
    uint256 knownReserve,
    uint256 opposingReserve,
    uint256 feePercent,
    uint256 unknownFee
) = UniswapV2Service._sortReserves(pool, knownToken);

Testing V2

solidity

import {TestBase_UniswapV2} from "@crane/contracts/protocols/dexes/uniswap/v2/test/bases/TestBase_UniswapV2.sol";

contract MyTest is TestBase_UniswapV2 {
    function setUp() public override {
        super.setUp();
        // uniswapV2Factory and uniswapV2Router available
    }

    function test_swap() public {
        address pair = uniswapV2Factory.createPair(
            address(tokenA),
            address(tokenB)
        );

        // Add liquidity
        UniswapV2Service._deposit(
            uniswapV2Router,
            tokenA,
            tokenB,
            1000e18,
            1000e18
        );

        // Execute swap
        uint256 amountOut = UniswapV2Service._swap(
            uniswapV2Router,
            IUniswapV2Pair(pair),
            100e18,
            tokenA,
            tokenB
        );
    }
}

Uniswap V3 (Concentrated Liquidity)

Crane includes V3 pool and factory stubs with math libraries:

code

contracts/protocols/dexes/uniswap/v3/
├── UniswapV3Factory.sol
├── UniswapV3Pool.sol
├── UniswapV3PoolDeployer.sol
├── NoDelegateCall.sol
├── interfaces/
│   ├── IUniswapV3Factory.sol
│   ├── IUniswapV3Pool.sol
│   └── pool/
│       ├── IUniswapV3PoolActions.sol
│       └── ...
└── libraries/
    ├── TickMath.sol
    ├── SqrtPriceMath.sol
    ├── SwapMath.sol
    ├── FullMath.sol
    └── ...

Uniswap V4 (Hooks)

Crane includes V4 utilities and quoter:

solidity

import {UniswapV4Utils} from "@crane/contracts/protocols/dexes/uniswap/v4/utils/UniswapV4Utils.sol";
import {UniswapV4Quoter} from "@crane/contracts/protocols/dexes/uniswap/v4/utils/UniswapV4Quoter.sol";

// Quote a swap
UniswapV4Quoter.quoteSwap(poolKey, amountIn, zeroForOne);

// Quote a zap (single-token deposit)
UniswapV4ZapQuoter.quoteZap(poolKey, amountIn, token);

File Organization

code

contracts/protocols/dexes/uniswap/
├── v2/
│   ├── services/
│   │   └── UniswapV2Service.sol
│   ├── aware/
│   │   ├── UniswapV2RouterAwareRepo.sol
│   │   └── UniswapV2FactoryAwareRepo.sol
│   ├── stubs/
│   │   ├── UniV2Factory.sol
│   │   ├── UniV2Pair.sol
│   │   ├── UniV2Router02.sol
│   │   └── deps/libs/
│   │       ├── Math.sol
│   │       ├── UniswapV2Library.sol
│   │       └── ...
│   └── test/bases/
│       ├── TestBase_UniswapV2.sol
│       └── TestBase_UniswapV2_Pools.sol
├── v3/
│   ├── UniswapV3Factory.sol
│   ├── UniswapV3Pool.sol
│   ├── interfaces/
│   │   └── ...
│   ├── libraries/
│   │   ├── TickMath.sol
│   │   ├── SqrtPriceMath.sol
│   │   └── ...
│   └── test/bases/
│       └── TestBase_UniswapV3.sol
└── v4/
    ├── interfaces/
    │   ├── IHooks.sol
    │   └── IPoolManager.sol
    ├── libraries/
    │   └── ...
    ├── types/
    │   ├── Currency.sol
    │   ├── PoolId.sol
    │   └── PoolKey.sol
    └── utils/
        ├── UniswapV4Utils.sol
        ├── UniswapV4Quoter.sol
        └── UniswapV4ZapQuoter.sol

Storage Slots (AwareRepos)

Repo	Slot
UniswapV2RouterAwareRepo	`"protocols.dexes.uniswap.v2.router.aware"`
UniswapV2FactoryAwareRepo	`"protocols.dexes.uniswap.v2.factory.aware"`

Additional Resources

Reference Files

•references/uniswap-services.md - Detailed patterns and examples