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LiquidatorInfo.sol
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LiquidatorInfo.sol
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pragma solidity ^0.5.16;
pragma experimental ABIEncoderV2;
import { Registry } from "./../Registry.sol";
import { BComptroller } from "./../BComptroller.sol";
import { CTokenInterface } from "./../interfaces/CTokenInterfaces.sol";
import { IBToken } from "./../interfaces/IBToken.sol";
import { ICushion } from "./../interfaces/IAvatar.sol";
import { IComptroller } from "./../interfaces/IComptroller.sol";
import { IUniswapAnchoredView } from "./../interfaces/IUniswapAnchoredView.sol";
import { Pool } from "./../Pool.sol";
contract LiquidatorInfo {
address constant ETH = address(0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE);
struct AvatarInfo {
address user;
uint totalDebt; // total debt according to price feed
uint totalCollateral; // total collateral according to price feed
uint weightedCollateral; // collateral x collateral factor. liquidation when weightedCollateral < totalDebt
address[] debtTokens;
uint[] debtAmounts;
address[] collateralTokens;
uint[] collateralAmounts;
uint[] weightedCollateralAmounts;
}
struct CushionInfo {
bool hasCushion;
bool shouldTopup;
bool shouldUntop;
address cushionCurrentToken;
uint cushionCurrentSize;
uint cushionTokenTotalDebt;
address[] cushionPossibleTokens; // which tokens could be used for cushion
uint[] cushionMaxSizes;
}
struct LiquidationInfo {
// only relevant if there is a cushion. we assume only one liquidator
uint remainingLiquidationSize;
uint memberLiquidationIncentive;
}
struct AccountInfo {
AvatarInfo avatarInfo;
CushionInfo cushionInfo;
LiquidationInfo liquidationInfo;
uint blockNumber;
}
struct CToken2BToken {
address[] cTokens;
address[] bTokens;
}
struct CurrentPrices {
uint[] currPrices;
string[] symbols;
}
struct Info {
AccountInfo[] accountInfo;
CToken2BToken c2bMapping;
CurrentPrices currPrices;
uint numAvatars;
}
function getCTokenToBTokenList(BComptroller bComptroller)
public
view
returns (CToken2BToken memory info)
{
info.cTokens = bComptroller.getAllMarkets();
info.bTokens = new address[](info.cTokens.length);
for(uint i = 0; i < info.cTokens.length; i++) {
info.bTokens[i] = bComptroller.c2b(info.cTokens[i]);
}
}
function getCurrentPrices(IUniswapAnchoredView oracle, string[] memory symbols)
public
view
returns (CurrentPrices memory info)
{
info.currPrices = new uint[](symbols.length);
info.symbols = symbols;
for(uint i = 0 ; i < symbols.length ; i++) {
info.currPrices[i] = oracle.price(symbols[i]);
}
}
function isIn(address[] memory array, address elm) internal pure returns(bool) {
for(uint i = 0 ; i < array.length ; i++) {
if(elm == array[i]) return true;
}
return false;
}
function getAvatarInfo(
Registry registry,
BComptroller bComptroller,
address[] memory cTokens,
uint[] memory priceFeed,
address avatar
)
public
returns(AvatarInfo memory info)
{
require(cTokens.length == priceFeed.length, "cTokens-priceFeed-missmatch");
uint numTokens = cTokens.length;
address user = registry.ownerOf(avatar);
info.user = user;
info.debtTokens = new address[](numTokens);
info.debtAmounts = new uint[](numTokens);
info.collateralTokens = new address[](numTokens);
info.collateralAmounts = new uint[](numTokens);
info.weightedCollateralAmounts = new uint[](numTokens);
IComptroller comptroller = bComptroller.comptroller();
address[] memory assetsIn = comptroller.getAssetsIn(avatar);
for(uint i = 0 ; i < numTokens ; i++) {
if(registry.cEther() == cTokens[i])
info.debtTokens[i] = ETH;
else
info.debtTokens[i] = address(CTokenInterface(cTokens[i]).underlying());
address bToken = bComptroller.c2b(cTokens[i]);
info.debtAmounts[i] = IBToken(bToken).borrowBalanceCurrent(user);
info.collateralTokens[i] = cTokens[i];
info.collateralAmounts[i] = IBToken(bToken).balanceOfUnderlying(user);
if(! isIn(assetsIn, cTokens[i])) info.collateralAmounts[i] = 0;
// set as 0 if not in market
// CR = collateralRatio = collateralFactorMantissa
(,uint CR) = comptroller.markets(cTokens[i]);
info.weightedCollateralAmounts[i] = info.collateralAmounts[i] * CR / 1e18;
info.totalDebt += info.debtAmounts[i] * priceFeed[i] / 1e18;
info.totalCollateral += info.collateralAmounts[i] * priceFeed[i] / 1e18;
info.weightedCollateral += info.weightedCollateralAmounts[i] * priceFeed[i] / 1e18;
}
}
function cTokenToUnderlying(Registry registry, address cToken) internal view returns(address) {
if(registry.cEther() == cToken)
return ETH;
else
return address(CTokenInterface(cToken).underlying());
}
function getCushionInfo(
Registry registry,
BComptroller bComptroller,
Pool pool,
address[] memory cTokens,
uint[] memory priceFeed,
uint debtAmount,
uint weightedCollateral,
address avatar,
address me
)
public
returns(CushionInfo memory info)
{
address user = registry.ownerOf(avatar);
info.hasCushion = ICushion(avatar).toppedUpAmount() > 0;
(, uint amountTopped,) = pool.getMemberTopupInfo(user, me);
if(debtAmount > weightedCollateral) {
// assume there is only one member
info.shouldTopup = true;
}
info.shouldUntop = (!info.hasCushion && amountTopped > 0);
if(amountTopped > 0) {
(,address toppedCToken) = pool.topped(avatar);
info.cushionCurrentToken = cTokenToUnderlying(registry, toppedCToken);
info.cushionCurrentSize = amountTopped;
}
info.cushionPossibleTokens = new address[](cTokens.length);
info.cushionMaxSizes = new uint[](cTokens.length);
for(uint i = 0 ; i < cTokens.length ; i++) {
uint debt = IBToken(bComptroller.c2b(cTokens[i])).borrowBalanceCurrent(user);
uint debtUsd = debt * priceFeed[i] / 1e18;
if(amountTopped > 0 && info.hasCushion) {
if(info.cushionCurrentToken != cTokenToUnderlying(registry, cTokens[i])) continue;
info.cushionTokenTotalDebt = debt;
debt -= amountTopped;
}
info.cushionPossibleTokens[i] = cTokenToUnderlying(registry, cTokens[i]);
info.cushionMaxSizes[i] = debt;
if(debtAmount > weightedCollateral) {
// not enough debt to topup
if(debtUsd < (debtAmount - weightedCollateral)) info.cushionMaxSizes[i] = 0;
}
}
}
function getLiquidationInfo(Pool pool, address avatar) public returns(LiquidationInfo memory info) {
info.remainingLiquidationSize = ICushion(avatar).remainingLiquidationAmount();
Registry registry = Registry(address(pool.registry()));
IComptroller comptroller = IComptroller(registry.comptroller());
info.memberLiquidationIncentive =
comptroller.liquidationIncentiveMantissa() * pool.shareNumerator() / pool.shareDenominator();
}
function getSingleAccountInfo(
Pool pool,
Registry registry,
BComptroller bComptroller,
address me,
address avatar,
address[] memory cTokens,
uint[] memory priceFeed
)
public
returns(AccountInfo memory info)
{
info.avatarInfo = getAvatarInfo(registry, bComptroller, cTokens, priceFeed, avatar);
info.cushionInfo = getCushionInfo(
registry,
bComptroller,
pool,
cTokens,
priceFeed,
info.avatarInfo.totalDebt,
info.avatarInfo.weightedCollateral,
avatar,
me
);
info.liquidationInfo = getLiquidationInfo(pool, avatar);
info.blockNumber = block.number;
if(info.avatarInfo.totalDebt > info.avatarInfo.weightedCollateral) {
if(info.liquidationInfo.remainingLiquidationSize == 0) {
info.liquidationInfo.remainingLiquidationSize = info.cushionInfo.cushionTokenTotalDebt / 2;
}
}
}
function getInfo(
uint startAccount,
uint endAccount,
address me,
Pool pool,
address[] memory cTokens,
uint[] memory priceFeed,
string[] memory symbols
)
public
returns(Info memory info)
{
info.accountInfo = new AccountInfo[](endAccount + 1 - startAccount);
Registry registry = Registry(address(pool.registry()));
BComptroller bComptroller = BComptroller(address(pool.bComptroller()));
for(uint i = 0 ; i + startAccount <= endAccount ; i++) {
uint accountNumber = i + startAccount;
address avatar = registry.avatars(accountNumber);
info.accountInfo[i] = getSingleAccountInfo(pool, registry, bComptroller, me, avatar, cTokens, priceFeed);
}
IComptroller comptroller = IComptroller(BComptroller(bComptroller).comptroller());
IUniswapAnchoredView oracle = IUniswapAnchoredView(comptroller.oracle());
info.c2bMapping = getCTokenToBTokenList(bComptroller);
info.currPrices = getCurrentPrices(oracle, symbols);
info.numAvatars = registry.avatarLength();
}
function getNumAvatars(Pool pool) public view returns(uint) {
Registry registry = Registry(address(pool.registry()));
return registry.avatarLength();
}
}