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Add PerpV2LeverageModuleViewer (#185)
Add PerpV2LeverageModuleViewer for returning max issue and perp position data.
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‎contracts/interfaces/IPerpV2LeverageModule.sol‎

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@@ -108,32 +108,6 @@ interface IPerpV2LeverageModule {
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uint256 _amountWithdrawn
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);
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/* ============ State Variable Getters ============ */
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// PerpV2 contract which provides getters for base, quote, and owedRealizedPnl balances
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function perpAccountBalance() external view returns(IAccountBalance);
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// PerpV2 contract which provides a trading API
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function perpClearingHouse() external view returns(IClearingHouse);
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// PerpV2 contract which manages trading logic. Provides getters for UniswapV3 pools and pending funding balances
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function perpExchange() external view returns(IExchange);
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// PerpV2 contract which handles deposits and withdrawals. Provides getter for collateral balances
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function perpVault() external view returns(IVault);
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// PerpV2 contract which makes it possible to simulate a trade before it occurs
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function perpQuoter() external view returns(IQuoter);
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// PerpV2 contract which provides a getter for baseToken UniswapV3 pools
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function perpMarketRegistry() external view returns(IMarketRegistry);
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// Token (USDC) used as a vault deposit, Perp currently only supports USDC as it's settlement and collateral token
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function collateralToken() external view returns(IERC20);
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// Decimals of collateral token. We set this in the constructor for later reading
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function collateralDecimals() external view returns(uint8);
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/* ============ External Functions ============ */
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/**
@@ -285,8 +259,15 @@ interface IPerpV2LeverageModule {
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/**
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* @dev Gets the mid-point price of a virtual asset from UniswapV3 markets maintained by Perp Protocol
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*
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* @param _baseToken) Address of virtual token to price
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* @param _baseToken Address of virtual token to price
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* @return price Mid-point price of virtual token in UniswapV3 AMM market
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*/
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function getAMMSpotPrice(address _baseToken) external view returns (uint256 price);
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/**
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* @dev Returns address of collateral token used by Perpetual Protocol (USDC)
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*
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* @return Address of Perpetual Protocol collateral token (USDC)
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*/
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function collateralToken() external view returns (IERC20);
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}

‎contracts/interfaces/external/perp-v2/IClearingHouseConfig.sol‎

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@@ -0,0 +1,24 @@
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/*
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Copyright 2022 Set Labs Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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SPDX-License-Identifier: Apache License, Version 2.0
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*/
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pragma solidity 0.6.10;
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pragma experimental ABIEncoderV2;
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interface IClearingHouseConfig {
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function getImRatio() external view returns (uint24 imRatio);
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}

‎contracts/interfaces/external/perp-v2/IIndexPrice.sol‎

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/*
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Copyright 2022 Set Labs Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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SPDX-License-Identifier: Apache License, Version 2.0
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*/
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pragma solidity 0.6.10;
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interface IIndexPrice {
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function getIndexPrice(uint256 interval) external view returns (uint256 indexPrice);
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}

‎contracts/mocks/protocol/module/DebtModuleMock.sol‎

Lines changed: 3 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -47,9 +47,7 @@ contract DebtModuleMock is ModuleBase {
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mapping(address=>int256) public equityIssuanceAdjustment;
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mapping(address=>int256) public debtIssuanceAdjustment;
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constructor(IController _controller, address _module) public ModuleBase(_controller) {
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module = _module;
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}
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constructor(IController _controller) public ModuleBase(_controller) {}
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function addDebt(ISetToken _setToken, address _token, uint256 _amount) external {
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_setToken.editExternalPosition(_token, address(this), _amount.toInt256().mul(-1), "");
@@ -131,8 +129,9 @@ contract DebtModuleMock is ModuleBase {
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return (equityAdjustments, debtAdjustments);
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}
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134-
function initialize(ISetToken _setToken) external {
132+
function initialize(ISetToken _setToken, address _module) external {
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_setToken.initializeModule();
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module = _module;
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IDebtIssuanceModule(module).registerToIssuanceModule(_setToken);
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}
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‎contracts/protocol-viewers/PerpV2LeverageModuleViewer.sol‎

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/*
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Copyright 2020 Set Labs Inc.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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SPDX-License-Identifier: Apache License, Version 2.0
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*/
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pragma solidity 0.6.10;
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pragma experimental "ABIEncoderV2";
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import { ERC20 } from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
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import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol";
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import { SafeCast } from "@openzeppelin/contracts/utils/SafeCast.sol";
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import { SafeMath } from "@openzeppelin/contracts/math/SafeMath.sol";
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import { SignedSafeMath } from "@openzeppelin/contracts/math/SignedSafeMath.sol";
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import { IAccountBalance } from "../interfaces/external/perp-v2/IAccountBalance.sol";
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import { IClearingHouseConfig } from "../interfaces/external/perp-v2/IClearingHouseConfig.sol";
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import { IIndexPrice } from "../interfaces/external/perp-v2/IIndexPrice.sol";
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import { IPerpV2LeverageModule } from "../interfaces/IPerpV2LeverageModule.sol";
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import { ISetToken } from "../interfaces/ISetToken.sol";
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import { PreciseUnitMath } from "../lib/PreciseUnitMath.sol";
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/**
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* @title PerpV2LeverageModuleViewer
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* @author Set Protocol
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*
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* PerpV2LeverageModuleViewer enables queries of information regarding open PerpV2 positions
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* specifically for leverage ratios and issuance maximums.
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*/
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contract PerpV2LeverageModuleViewer {
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using SafeCast for int256;
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using SafeCast for uint256;
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using SafeMath for uint256;
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using PreciseUnitMath for uint256;
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using PreciseUnitMath for int256;
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using SignedSafeMath for int256;
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/* ============ Structs ============ */
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struct VAssetDisplayInfo {
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string symbol; // Symbol of vAsset
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address vAssetAddress; // Address of vAsset
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int256 positionUnit; // Position unit of vAsset
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uint256 indexPrice; // Current index price of vAsset
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int256 currentLeverageRatio; // Current leverage ratio of vAsset (using total collateral value)
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}
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/* ============ State Variables ============ */
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IPerpV2LeverageModule public immutable perpModule; // PerpV2LeverageModule instance
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IAccountBalance public immutable perpAccountBalance; // Perp's Account Balance contract
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IClearingHouseConfig public immutable perpClearingHouseConfig; // PerpV2's ClearingHouseConfig contract
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ERC20 public immutable vQuoteToken; // Virtual Quote asset for PerpV2 (vUSDC)
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IERC20 public immutable collateralToken; // Address of collateral token used by Perp (USDC)
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/* ============ Constructor ============ */
70+
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/**
72+
* @dev Sets passed state variable and grabs collateral asset from perpModule.
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*
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* @param _perpModule Address of PerpV2LeverageModule contract
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* @param _perpAccountBalance Address of PerpV2's AccountBalance contract
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* @param _perpClearingHouseConfig Address of PerpV2's ClearingHouseConfig contract
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* @param _vQuoteToken Address of virtual Quote asset for PerpV2 (vUSDC)
78+
*/
79+
constructor(
80+
IPerpV2LeverageModule _perpModule,
81+
IAccountBalance _perpAccountBalance,
82+
IClearingHouseConfig _perpClearingHouseConfig,
83+
ERC20 _vQuoteToken
84+
) public {
85+
perpModule = _perpModule;
86+
perpAccountBalance = _perpAccountBalance;
87+
perpClearingHouseConfig = _perpClearingHouseConfig;
88+
vQuoteToken = _vQuoteToken;
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collateralToken = _perpModule.collateralToken();
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}
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/* ============ External View Functions ============ */
93+
94+
/**
95+
* @dev Returns the maximum amount of Sets that can be issued. Because upon issuance we lever up the Set
96+
* before depositing collateral there is a ceiling on the amount of Sets that can be issued before the max
97+
* leverage ratio is met. In order to accurately predict this amount the user must pass in an expected
98+
* slippage amount, this amount should be calculated relative to Index price(s) of vAssets held by the Set,
99+
* not the mid-market prices. The formulas used here are based on the "conservative" definition of free
100+
* collateral as defined in PerpV2's docs: freeCollateral = min(totalCollateral, accountValue) - totalDebt * initialMarginRatio
101+
*
102+
* We want to find the point where freeCollateral = 0 after all trades have been executed.
103+
* freeCollateral = 0 => totalDebt = min(totalCollateral, accountValue) / initialMarginRatio
104+
* and, availableDebt = totalDebt - currentDebt
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*
106+
* Now, accountValue = totalCollateral + unrealizedPnl
107+
* if unrealizedPnl >=0:
108+
* min(totalCollateral, accountValue) = totalCollateral
109+
* availableDebt = (totalCollateral / imRatio) - currentDebt
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* if unrealizedPnl < 0:
111+
* min(totalCollateral, accountValue) = accountValue
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* availableDebt = ((totalCollateral + unrealizedPnl) / imRatio) - currentDebt
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*
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* We also know that any slippage gets accrued to unrealizedPnl BEFORE any new collateral is being deposited so
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* we need to account for our expected slippage accrual impact on accountValue by subtracting our expected amount
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* of slippage divided by the imRatio from the availableDebt. We can then divide the availableDebtWithSlippage by
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* the absolute value of our current position and multiply by our totalSupply to get the max issue amount.
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*
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* @param _setToken Instance of SetToken
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* @param _slippage Expected slippage from entering position in precise units (1% = 10^16)
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*
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* @return Maximum amount of Sets that can be issued
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*/
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function getMaximumSetTokenIssueAmount(ISetToken _setToken, int256 _slippage) external view returns (uint256) {
125+
uint256 totalAbsPositionValue = perpAccountBalance.getTotalAbsPositionValue(address(_setToken));
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if (totalAbsPositionValue == 0) { return PreciseUnitMath.maxUint256(); }
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// Scale imRatio to 10 ** 18 (preciseUnits)
130+
int256 imRatio = uint256(perpClearingHouseConfig.getImRatio()).mul(1e12).toInt256();
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(, int256 unrealizedPnl, ) = perpAccountBalance.getPnlAndPendingFee(address(_setToken));
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int256 totalDebtValue = perpAccountBalance.getTotalDebtValue(address(_setToken)).toInt256();
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int256 totalCollateralValue = _calculateTotalCollateralValue(_setToken);
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int256 availableDebt = unrealizedPnl >= 0
138+
? totalCollateralValue.preciseDiv(imRatio).sub(totalDebtValue)
139+
: totalCollateralValue.add(unrealizedPnl).preciseDiv(imRatio).sub(totalDebtValue);
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int256 availableDebtWithSlippage = availableDebt.sub(availableDebt.preciseMul(_slippage).preciseDiv(imRatio));
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// max issue amount = available debt in USD (with slippage) / increase in totalDebtValue per Set issued
144+
// = (availableDebtWithSlippage / totalAbsPositionValue) * setTotalSupply
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return availableDebtWithSlippage.toUint256().preciseDiv(totalAbsPositionValue).preciseMul(_setToken.totalSupply());
146+
}
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/**
149+
* @dev Returns the position unit for total collateral value as defined by Perpetual Protocol. TCV = collateral + owedRealizedPnl + pendingFunding.
150+
*
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* @param _setToken Instance of SetToken
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*
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* @return Collateral token address
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* @return Total collateral value position unit
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*/
156+
function getTotalCollateralUnit(ISetToken _setToken) external view returns (IERC20, int256) {
157+
int256 setTotalSupply = _setToken.totalSupply().toInt256();
158+
return (collateralToken, _calculateTotalCollateralValue(_setToken).preciseDiv(setTotalSupply));
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}
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/**
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* @dev Returns relevant data for displaying current positions. Identifying info for each position plus current
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* size, index price, and leverage of each vAsset with an open position is returned. The sum quantity of vUSDC
164+
* is returned along with identifying info in last index of array.
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*
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* @param _setToken Instance of SetToken
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*
168+
* @return assetInfo Array of info concerning size and leverage of current vAsset positions
169+
*/
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function getVirtualAssetsDisplayInfo(
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ISetToken _setToken
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)
173+
external
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view
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returns (VAssetDisplayInfo[] memory assetInfo)
176+
{
177+
uint256 setTotalSupply = _setToken.totalSupply();
178+
IPerpV2LeverageModule.PositionNotionalInfo[] memory positionInfo = perpModule.getPositionNotionalInfo(_setToken);
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int256 totalCollateralValue = _calculateTotalCollateralValue(_setToken);
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uint256 positionsLength = positionInfo.length;
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assetInfo = new VAssetDisplayInfo[](positionsLength.add(1));
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int256 vQuoteBalance;
186+
for (uint256 i = 0; i < positionsLength; i++) {
187+
IPerpV2LeverageModule.PositionNotionalInfo memory position = positionInfo[i];
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uint256 indexPrice = IIndexPrice(position.baseToken).getIndexPrice(0);
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assetInfo[i] = VAssetDisplayInfo({
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symbol: ERC20(position.baseToken).symbol(),
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vAssetAddress: position.baseToken,
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positionUnit: position.baseBalance.preciseDiv(setTotalSupply.toInt256()),
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indexPrice: indexPrice,
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currentLeverageRatio: _calculateCurrentLeverageRatio(position, indexPrice, totalCollateralValue)
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});
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vQuoteBalance = vQuoteBalance.add(position.quoteBalance);
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}
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assetInfo[positionsLength] = VAssetDisplayInfo({
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symbol: vQuoteToken.symbol(),
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vAssetAddress: address(vQuoteToken),
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positionUnit: vQuoteBalance.preciseDiv(setTotalSupply.toInt256()),
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indexPrice: PreciseUnitMath.preciseUnit(),
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currentLeverageRatio: 0
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});
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}
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/* ============ Internal Functions ============ */
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/**
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* @dev Returns total collateral value attributed to SetToken. TCV = collateral + owedRealizedPnl + funding.
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*
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* @param _setToken Instance of SetToken
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*
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* @return Total collateral value attributed to SetToken
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*/
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function _calculateTotalCollateralValue(ISetToken _setToken) internal view returns (int256) {
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IPerpV2LeverageModule.AccountInfo memory accountInfo = perpModule.getAccountInfo(_setToken);
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return accountInfo.collateralBalance
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.add(accountInfo.owedRealizedPnl)
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.add(accountInfo.pendingFundingPayments);
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}
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/**
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* @dev Returns leverage of passed position relative total collateral value of Set. Leverage ratio is defined as follows:
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* lr_asset = positionValue / accountValue where,
229+
* positionValue = indexPrice_asset * notionalBaseTokenAmount_asset and
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* accountValue = collateral + owedRealizedPnl + funding + positionValue_asset + quoteBalance_asset
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*
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* @param _position Struct containing position info for the vAsset
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* @param _indexPrice Index price of vAsset
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* @param _totalCollateralValue Value of total collateral attributed to SetToken
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*
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* @return Leverage ratio of vAsset relative to current total collateral
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*/
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function _calculateCurrentLeverageRatio(
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IPerpV2LeverageModule.PositionNotionalInfo memory _position,
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uint256 _indexPrice,
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int256 _totalCollateralValue
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)
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internal
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pure
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returns (int256)
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{
247+
int256 positionValue = _indexPrice.toInt256().preciseMul(_position.baseBalance);
248+
int256 accountValue = positionValue.add(_totalCollateralValue).add(_position.quoteBalance);
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return positionValue.preciseDiv(accountValue);
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}
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}

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