Liquidity.Party/tycho-protocol-sdk
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Finish tests

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This commit is contained in:
pistomat
2023-12-06 15:06:55 +01:00
parent 6097a32ab3
commit 223df970d3
4 changed files with 203 additions and 64 deletions
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32
evm/src/balancer-v2/BalancerV2SwapAdapter.sol
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@@ -3,18 +3,31 @@ pragma experimental ABIEncoderV2;
pragma solidity ^0.8.13;
import {IERC20, ISwapAdapter} from "src/interfaces/ISwapAdapter.sol";
import "forge-std/Test.sol";
// Maximum Swap In/Out Ratio - 0.3 https://balancer.gitbook.io/balancer/core-concepts/protocol/limitations#v2-limits
uint256 constant RESERVE_LIMIT_FACTOR = 4;
// Maximum Swap In/Out Ratio - 0.3
// https://balancer.gitbook.io/balancer/core-concepts/protocol/limitations#v2-limits
uint256 constant RESERVE_LIMIT_FACTOR = 4;
uint256 constant SWAP_DEADLINE_SEC = 1000;
contract BalancerV2SwapAdapter is ISwapAdapter {
contract BalancerV2SwapAdapter is ISwapAdapter, Test {
IVault immutable vault;
constructor(address payable vault_) {
vault = IVault(vault_);
}
/// @notice Calculate the price of the buy token in terms of the sell token.
/// @dev The resulting price is not scaled by the token decimals.
/// Also this function is not 'view' because Balancer V2 simulates the swap
/// and
/// then returns the amount diff in revert data.
/// @param pairId The ID of the trading pool.
/// @param sellToken The token being sold.
/// @param buyToken The token being bought.
/// @param sellAmount The amount of tokens being sold.
/// @return calculatedPrice The price of the buy token in terms of the sell
/// as a Fraction struct.
function priceSingle(
bytes32 pairId,
IERC20 sellToken,
@@ -44,9 +57,11 @@ contract BalancerV2SwapAdapter is ISwapAdapter {
assetDeltas = vault.queryBatchSwap(
IVault.SwapKind.GIVEN_IN, swapSteps, assets, funds
);
// TODO: the delta of buyToken is negative, so we need to flip the sign
calculatedPrice = Fraction(uint256(assetDeltas[1]), sellAmount);
// assetDeltas[1] is the amount of tokens sent from the vault (i.e.
// bought), so the sign is negative, which means the sign should be
// flipped to get the price.
calculatedPrice =
Fraction(uint256(-assetDeltas[1]), uint256(assetDeltas[0]));
}
function getSellAmount(
@@ -119,7 +134,8 @@ contract BalancerV2SwapAdapter is ISwapAdapter {
limit = 0;
} else {
kind = IVault.SwapKind.GIVEN_OUT;
sellAmount = getSellAmount(pairId, sellToken, buyToken, specifiedAmount);
sellAmount =
getSellAmount(pairId, sellToken, buyToken, specifiedAmount);
limit = type(uint256).max;
}
@@ -146,7 +162,7 @@ contract BalancerV2SwapAdapter is ISwapAdapter {
block.timestamp + SWAP_DEADLINE_SEC
);
trade.gasUsed = gasBefore - gasleft();
trade.price = Fraction(0, 1); // Without the price function return 0.
trade.price = priceSingle(pairId, sellToken, buyToken, specifiedAmount);
}
function getLimits(bytes32 pairId, IERC20 sellToken, IERC20 buyToken)