crane-camelot — Интеграция DeFi протокола Camelot V2

--- name: crane-camelot description: This skill should be used when the user asks about "Camelot integration", "Camelot swap", "Camelot liquidity", "Camelot V2", "fee-on-transfer tokens", "asymmetric fees", "directional fees", or needs to interact with Camelot DEX on Arbitrum using Crane's service library. license: MIT --- # Crane Camelot V2 Integration Crane provides Camelot V2 integration with service library, stubs, and test infrastructure. Camelot differs from standard Uniswap V2 forks by supporting asymmetric (directional) fees. ## Components | Component | Location | Purpose | |-----------|----------|---------| | `CamelotV2Service` | `services/CamelotV2Service.sol` | Swap, deposit, withdraw operations | | `CamelotV2RouterAwareRepo` | `CamelotV2RouterAwareRepo.sol` | Router dependency injection | | `CamelotV2FactoryAwareRepo` | `CamelotV2FactoryAwareRepo.sol` | Factory dependency injection | | `TestBase_CamelotV2` | `test/bases/TestBase_CamelotV2.sol` | Full protocol deployment | ## Key Difference: Asymmetric Fees Camelot pools have **directional fees** - different fees for each swap direction: ```solidity // Camelot's getReserves returns fees for each direction (uint112 reserve0, uint112 reserve1, uint16 token0feePercent, uint16 token1FeePercent) = pool.getReserves(); // token0feePercent: Fee when swapping token0 -> token1 // token1FeePercent: Fee when swapping token1 -> token0 ``` ## Quick Start: Execute Swap ```solidity import {CamelotV2Service} from "@crane/contracts/protocols/dexes/camelot/v2/services/CamelotV2Service.sol"; import {ICamelotV2Router} from "@crane/contracts/interfaces/protocols/dexes/camelot/v2/ICamelotV2Router.sol"; import {ICamelotPair} from "@crane/contracts/interfaces/protocols/dexes/camelot/v2/ICamelotPair.sol"; contract CamelotSwapper { ICamelotV2Router public router; function swap( ICamelotPair pool, IERC20 tokenIn, IERC20 tokenOut, uint256 amountIn ) external returns (uint256 amountOut) { tokenIn.transferFrom(msg.sender, address(this), amountIn); amountOut = CamelotV2Service._swap( router, pool, amountIn, tokenIn, tokenOut, address(0) // referrer (optional) ); } } ``` ## Service Operations ### Deposit (Add Liquidity) ```solidity function _deposit( ICamelotV2Router router, IERC20 tokenA, IERC20 tokenB, uint256 amountADesired, uint256 amountBDesired ) internal returns (uint256 liquidity); ``` ### Withdraw (Remove Liquidity) ```solidity // Direct withdrawal (no router) function _withdrawDirect( ICamelotPair pool, uint256 amt ) internal returns (uint256 amount0, uint256 amount1); ``` ### Swap ```solidity // Swap with pool auto-detection function _swap( ICamelotV2Router router, ICamelotPair pool, uint256 amountIn, IERC20 tokenIn, IERC20 tokenOut, address referrer ) internal returns (uint256 amountOut); // Swap with explicit reserves and fees function _swap( ICamelotV2Router router, uint256 amountIn, IERC20 tokenIn, uint256 reserveIn, uint256 feePercent, IERC20 tokenOut, uint256 reserveOut, address referrer ) internal returns (uint256 amountOut); ``` ### Swap and Deposit (Zap In) ```solidity function _swapDeposit( ICamelotV2Router router, ICamelotPair pool, IERC20 tokenIn, uint256 saleAmt, IERC20 opToken, address referrer ) internal returns (uint256 lpAmount); ``` ### Withdraw and Swap (Zap Out) ```solidity function _withdrawSwapDirect( ICamelotPair pool, ICamelotV2Router router, uint256 amt, IERC20 tokenOut, IERC20 opToken, address referrer ) internal returns (uint256 amountOut); ``` ## Reserve Sorting Get reserves sorted by known token: ```solidity ( uint256 knownReserve, uint256 opposingReserve, uint256 knownFeePercent, uint256 opposingFeePercent ) = CamelotV2Service._sortReserves(pool, knownToken); ``` ## Testing ```solidity import {TestBase_CamelotV2} from "@crane/contracts/protocols/dexes/camelot/v2/test/bases/TestBase_CamelotV2.sol"; contract MyTest is TestBase_CamelotV2 { function setUp() public override { super.setUp(); // camelotV2Factory and camelotV2Router available } function test_swap() public { // Create pair address pair = camelotV2Factory.createPair( address(tokenA), address(tokenB) ); // Add liquidity CamelotV2Service._deposit( camelotV2Router, tokenA, tokenB, 1000e18, 1000e18 ); // Execute swap uint256 amountOut = CamelotV2Service._swap( camelotV2Router, ICamelotPair(pair), 100e18, tokenA, tokenB, address(0) ); } } ``` ## Fee-on-Transfer Token Support Camelot uses `swapExactTokensForTokensSupportingFeeOnTransferTokens` to support deflationary tokens: ```solidity router.swapExactTokensForTokensSupportingFeeOnTransferTokens( amountIn, amountOutMin, path, to, referrer, deadline ); ``` ## File Organization ``` contracts/protocols/dexes/camelot/v2/ ├── services/ │ └── CamelotV2Service.sol ├── CamelotV2RouterAwareRepo.sol ├── CamelotV2FactoryAwareRepo.sol ├── stubs/ │ ├── CamelotFactory.sol │ ├── CamelotRouter.sol │ ├── CamelotPair.sol │ └── libraries/ │ ├── Math.sol │ ├── SafeMath.sol │ └── UniswapV2Library.sol └── test/bases/ └── TestBase_CamelotV2.sol ``` ## Additional Resources ### Reference Files - **`references/camelot-services.md`** - Detailed patterns and examples