2022-06-29 02:18:59 -07:00
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use anchor_lang::prelude::*;
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2022-07-04 04:13:11 -07:00
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use anchor_spl::token;
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use anchor_spl::token::Token;
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use anchor_spl::token::TokenAccount;
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2022-06-29 02:18:59 -07:00
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use fixed::types::I80F48;
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use crate::accounts_zerocopy::*;
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use crate::error::*;
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use crate::state::ScanningAccountRetriever;
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use crate::state::*;
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use crate::util::checked_math as cm;
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// Remaining accounts:
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// - all banks for liab_token_index (writable)
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// - merged health accounts for liqor+liqee
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#[derive(Accounts)]
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#[instruction(liab_token_index: TokenIndex)]
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pub struct LiqTokenBankruptcy<'info> {
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#[account(
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has_one = insurance_vault,
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)]
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pub group: AccountLoader<'info, Group>,
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#[account(
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mut,
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has_one = group,
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)]
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pub liqor: AccountLoader<'info, MangoAccount>,
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#[account(address = liqor.load()?.owner)]
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pub liqor_owner: Signer<'info>,
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#[account(
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mut,
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has_one = group,
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)]
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pub liqee: AccountLoader<'info, MangoAccount>,
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#[account(
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has_one = group,
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constraint = liab_mint_info.load()?.token_index == liab_token_index,
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)]
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pub liab_mint_info: AccountLoader<'info, MintInfo>,
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#[account(mut)]
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pub quote_vault: Account<'info, TokenAccount>,
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#[account(mut)]
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pub insurance_vault: Account<'info, TokenAccount>,
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pub token_program: Program<'info, Token>,
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}
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impl<'info> LiqTokenBankruptcy<'info> {
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pub fn transfer_ctx(&self) -> CpiContext<'_, '_, '_, 'info, token::Transfer<'info>> {
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let program = self.token_program.to_account_info();
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let accounts = token::Transfer {
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from: self.insurance_vault.to_account_info(),
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to: self.quote_vault.to_account_info(),
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authority: self.group.to_account_info(),
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};
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CpiContext::new(program, accounts)
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}
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}
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pub fn liq_token_bankruptcy(
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ctx: Context<LiqTokenBankruptcy>,
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liab_token_index: TokenIndex,
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max_liab_transfer: I80F48,
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) -> Result<()> {
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let group = ctx.accounts.group.load()?;
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let group_pk = &ctx.accounts.group.key();
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// split remaining accounts into banks and health
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let liab_mint_info = ctx.accounts.liab_mint_info.load()?;
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let bank_pks = liab_mint_info.banks();
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let (bank_ais, health_ais) = &ctx.remaining_accounts.split_at(bank_pks.len());
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require!(
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bank_ais.iter().map(|ai| ai.key).eq(bank_pks.iter()),
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MangoError::SomeError
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);
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let mut liqor = ctx.accounts.liqor.load_mut()?;
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require!(!liqor.is_bankrupt(), MangoError::IsBankrupt);
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let mut liqee = ctx.accounts.liqee.load_mut()?;
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require!(liqee.is_bankrupt(), MangoError::SomeError);
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let liab_bank = bank_ais[0].load::<Bank>()?;
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let liab_deposit_index = liab_bank.deposit_index;
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let (liqee_liab, liqee_raw_token_index, _) =
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liqee.tokens.get_mut_or_create(liab_token_index)?;
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let mut remaining_liab_loss = -liqee_liab.native(&liab_bank);
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require_gt!(remaining_liab_loss, I80F48::ZERO);
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drop(liab_bank);
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let mut account_retriever = ScanningAccountRetriever::new(health_ais, group_pk)?;
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// find insurance transfer amount
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let (liab_bank, liab_price, opt_quote_bank_and_price) =
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account_retriever.banks_mut_and_oracles(liab_token_index, QUOTE_TOKEN_INDEX)?;
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let liab_fee_factor = if liab_token_index == QUOTE_TOKEN_INDEX {
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I80F48::ONE
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} else {
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cm!(I80F48::ONE + liab_bank.liquidation_fee)
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};
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let liab_price_adjusted = cm!(liab_price * liab_fee_factor);
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let liab_transfer_unrounded = remaining_liab_loss.min(max_liab_transfer);
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let insurance_transfer = cm!(liab_transfer_unrounded * liab_price_adjusted)
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.checked_ceil()
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.unwrap()
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.checked_to_num::<u64>()
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.unwrap()
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.min(ctx.accounts.insurance_vault.amount);
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let insurance_fund_exhausted = insurance_transfer == ctx.accounts.insurance_vault.amount;
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let insurance_transfer_i80f48 = I80F48::from(insurance_transfer);
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// AUDIT: v3 does this, but it seems bad, because it can make liab_transfer
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// exceed max_liab_transfer due to the ceil() above! Otoh, not doing it would allow
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// liquidators to exploit the insurance fund for 1 native token each call.
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let liab_transfer = cm!(insurance_transfer_i80f48 / liab_price_adjusted);
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let mut liqee_liab_active = true;
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if insurance_transfer > 0 {
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// in the end, the liqee gets liab assets
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liqee_liab_active = liab_bank.deposit(liqee_liab, liab_transfer)?;
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remaining_liab_loss = -liqee_liab.native(&liab_bank);
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// move insurance assets into quote bank
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let group_seeds = group_seeds!(group);
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token::transfer(
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ctx.accounts.transfer_ctx().with_signer(&[group_seeds]),
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insurance_transfer,
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)?;
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// move quote assets into liqor and withdraw liab assets
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if let Some((quote_bank, _)) = opt_quote_bank_and_price {
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require_keys_eq!(quote_bank.vault, ctx.accounts.quote_vault.key());
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require_keys_eq!(quote_bank.mint, ctx.accounts.insurance_vault.mint);
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// credit the liqor
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let (liqor_quote, liqor_quote_raw_token_index, _) =
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liqor.tokens.get_mut_or_create(QUOTE_TOKEN_INDEX)?;
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let liqor_quote_active = quote_bank.deposit(liqor_quote, insurance_transfer_i80f48)?;
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// transfer liab from liqee to liqor
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let (liqor_liab, liqor_liab_raw_token_index, _) =
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liqor.tokens.get_mut_or_create(liab_token_index)?;
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let liqor_liab_active = liab_bank.withdraw_with_fee(liqor_liab, liab_transfer)?;
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// Check liqor's health
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let liqor_health = compute_health(&liqor, HealthType::Init, &account_retriever)?;
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require!(liqor_health >= 0, MangoError::HealthMustBePositive);
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if !liqor_quote_active {
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liqor.tokens.deactivate(liqor_quote_raw_token_index);
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}
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if !liqor_liab_active {
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liqor.tokens.deactivate(liqor_liab_raw_token_index);
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}
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} else {
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// This happens when asset_token_index == liab_token_index: the insurance fund
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// deposits directly into liqee, without a fee or the liqor indirection
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require_eq!(liab_price_adjusted, I80F48::ONE);
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require_eq!(insurance_transfer_i80f48, liab_transfer);
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}
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}
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drop(account_retriever);
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// Socialize loss
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if insurance_fund_exhausted && remaining_liab_loss.is_positive() {
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// find the total deposits
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let mut indexed_total_deposits = I80F48::ZERO;
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for bank_ai in bank_ais.iter() {
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let bank = bank_ai.load::<Bank>()?;
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indexed_total_deposits = cm!(indexed_total_deposits + bank.indexed_deposits);
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}
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// TODO: what if loss is greater than entire deposits?
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// total_indexed_deposits * (deposit_index - new_deposit_index) = remaining_liab_loss
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let new_deposit_index =
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cm!(liab_deposit_index - remaining_liab_loss / indexed_total_deposits);
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let mut amount_to_credit = remaining_liab_loss;
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let mut position_active = true;
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for bank_ai in bank_ais.iter() {
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let mut bank = bank_ai.load_mut::<Bank>()?;
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bank.deposit_index = new_deposit_index;
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// credit liqee on each bank where we can offset borrows
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let amount_for_bank = amount_to_credit.min(bank.native_borrows());
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if amount_for_bank.is_positive() {
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position_active = bank.deposit(liqee_liab, amount_for_bank)?;
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amount_to_credit = cm!(amount_to_credit - amount_for_bank);
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if amount_to_credit.is_zero() {
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break;
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}
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}
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}
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require!(!position_active, MangoError::SomeError);
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liqee_liab_active = false;
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}
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// If the account has no more borrows then it's no longer bankrupt
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let account_retriever = ScanningAccountRetriever::new(health_ais, group_pk)?;
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let liqee_health_cache = new_health_cache(&liqee, &account_retriever)?;
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liqee.set_bankrupt(liqee_health_cache.has_borrows());
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if !liqee_liab_active {
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liqee.tokens.deactivate(liqee_raw_token_index);
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}
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Ok(())
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}
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