processor.rs

//! Program state processor

use crate::state::Bonus;
use crate::{
    self as solend_program,
    error::LendingError,
    instruction::LendingInstruction,
    math::{Decimal, Rate, TryAdd, TryDiv, TryMul, TrySub},
    state::{
        validate_reserve_config, CalculateBorrowResult, CalculateLiquidationResult,
        CalculateRepayResult, InitLendingMarketParams, InitObligationParams, InitReserveParams,
        LendingMarket, NewReserveCollateralParams, NewReserveLiquidityParams, Obligation, Reserve,
        ReserveCollateral, ReserveConfig, ReserveLiquidity,
    },
};
use bytemuck::bytes_of;
use oracles::get_single_price;
use oracles::get_single_price_unchecked;
use oracles::pyth::validate_pyth_keys;
use oracles::switchboard::validate_sb_on_demand_keys;
use oracles::switchboard::validate_switchboard_keys;
use oracles::{get_oracle_type, pyth::validate_pyth_price_account_info, OracleType};
#[cfg(not(feature = "test-bpf"))]
use solana_program::pubkey;
use solana_program::{
    account_info::{next_account_info, AccountInfo},
    entrypoint::ProgramResult,
    instruction::{get_stack_height, Instruction, TRANSACTION_LEVEL_STACK_HEIGHT},
    msg,
    program::{invoke, invoke_signed},
    program_error::ProgramError,
    program_pack::{IsInitialized, Pack},
    pubkey::Pubkey,
    system_instruction::create_account,
    sysvar::instructions::{load_current_index_checked, load_instruction_at_checked},
    sysvar::{clock::Clock, rent::Rent, Sysvar},
};
use solend_sdk::{
    math::SaturatingSub,
    state::{LendingMarketMetadata, RateLimiter, RateLimiterConfig, ReserveType},
};

use spl_token::state::Mint;
use std::{cmp::min, result::Result};

/// solend market owner
pub mod solend_market_owner {
    solana_program::declare_id!("5pHk2TmnqQzRF9L6egy5FfiyBgS7G9cMZ5RFaJAvghzw");
}

/// Processes an instruction
pub fn process_instruction(
    program_id: &Pubkey,
    accounts: &[AccountInfo],
    input: &[u8],
) -> ProgramResult {
    let instruction = LendingInstruction::unpack(input)?;
    match instruction {
        LendingInstruction::InitLendingMarket {
            owner,
            quote_currency,
        } => {
            msg!("Instruction: Init Lending Market");
            process_init_lending_market(program_id, owner, quote_currency, accounts)
        }
        LendingInstruction::SetLendingMarketOwnerAndConfig {
            new_owner,
            rate_limiter_config,
            whitelisted_liquidator,
            risk_authority,
        } => {
            msg!("Instruction: Set Lending Market Owner");
            process_set_lending_market_owner_and_config(
                program_id,
                new_owner,
                rate_limiter_config,
                whitelisted_liquidator,
                risk_authority,
                accounts,
            )
        }
        LendingInstruction::InitReserve {
            liquidity_amount,
            config,
        } => {
            msg!("Instruction: Init Reserve");
            process_init_reserve(program_id, liquidity_amount, config, accounts)
        }
        LendingInstruction::RefreshReserve => {
            msg!("Instruction: Refresh Reserve");
            process_refresh_reserve(program_id, accounts)
        }
        LendingInstruction::DepositReserveLiquidity { liquidity_amount } => {
            msg!("Instruction: Deposit Reserve Liquidity");
            process_deposit_reserve_liquidity(program_id, liquidity_amount, accounts)
        }
        LendingInstruction::RedeemReserveCollateral { collateral_amount } => {
            msg!("Instruction: Redeem Reserve Collateral");
            process_redeem_reserve_collateral(program_id, collateral_amount, accounts)
        }
        LendingInstruction::InitObligation => {
            msg!("Instruction: Init Obligation");
            process_init_obligation(program_id, accounts)
        }
        LendingInstruction::RefreshObligation => {
            msg!("Instruction: Refresh Obligation");
            process_refresh_obligation(program_id, accounts)
        }
        LendingInstruction::DepositObligationCollateral { collateral_amount } => {
            msg!("Instruction: Deposit Obligation Collateral");
            process_deposit_obligation_collateral(program_id, collateral_amount, accounts)
        }
        LendingInstruction::WithdrawObligationCollateral { collateral_amount } => {
            msg!("Instruction: Withdraw Obligation Collateral");
            process_withdraw_obligation_collateral(program_id, collateral_amount, accounts)
        }
        LendingInstruction::BorrowObligationLiquidity { liquidity_amount } => {
            msg!("Instruction: Borrow Obligation Liquidity");
            process_borrow_obligation_liquidity(program_id, liquidity_amount, accounts)
        }
        LendingInstruction::RepayObligationLiquidity { liquidity_amount } => {
            msg!("Instruction: Repay Obligation Liquidity");
            process_repay_obligation_liquidity(program_id, liquidity_amount, accounts)
        }
        LendingInstruction::LiquidateObligation { .. } => {
            msg!("Instruction: Liquidate Obligation");
            msg!("method deprecated, please migrate to Liquidate Obligation and Redeem Reserve Collateral");
            Err(LendingError::DeprecatedInstruction.into())
        }
        LendingInstruction::FlashLoan { .. } => {
            msg!("Instruction: Flash Loan");
            msg!("This instruction has been deprecated. Use FlashBorrowReserveLiquidity instead");
            Err(LendingError::DeprecatedInstruction.into())
        }
        LendingInstruction::DepositReserveLiquidityAndObligationCollateral { liquidity_amount } => {
            msg!("Instruction: Deposit Reserve Liquidity and Obligation Collateral");
            process_deposit_reserve_liquidity_and_obligation_collateral(
                program_id,
                liquidity_amount,
                accounts,
            )
        }
        LendingInstruction::WithdrawObligationCollateralAndRedeemReserveCollateral {
            collateral_amount,
        } => {
            msg!("Instruction: Withdraw Obligation Collateral and Redeem Reserve Collateral");
            process_withdraw_obligation_collateral_and_redeem_reserve_liquidity(
                program_id,
                collateral_amount,
                accounts,
            )
        }
        LendingInstruction::UpdateReserveConfig {
            config,
            rate_limiter_config,
        } => {
            msg!("Instruction: UpdateReserveConfig");
            process_update_reserve_config(program_id, config, rate_limiter_config, accounts)
        }
        LendingInstruction::LiquidateObligationAndRedeemReserveCollateral { liquidity_amount } => {
            msg!("Instruction: Liquidate Obligation and Redeem Reserve Collateral");
            process_liquidate_obligation_and_redeem_reserve_collateral(
                program_id,
                liquidity_amount,
                accounts,
            )
        }
        LendingInstruction::RedeemFees => {
            msg!("Instruction: RedeemFees");
            process_redeem_fees(program_id, accounts)
        }
        LendingInstruction::FlashBorrowReserveLiquidity { liquidity_amount } => {
            msg!("Instruction: Flash Borrow Reserve Liquidity");
            process_flash_borrow_reserve_liquidity(program_id, liquidity_amount, accounts)
        }
        LendingInstruction::FlashRepayReserveLiquidity {
            liquidity_amount,
            borrow_instruction_index,
        } => {
            msg!("Instruction: Flash Repay Reserve Liquidity");
            process_flash_repay_reserve_liquidity(
                program_id,
                liquidity_amount,
                borrow_instruction_index,
                accounts,
            )
        }
        LendingInstruction::ForgiveDebt { liquidity_amount } => {
            msg!("Instruction: Forgive Debt");
            process_forgive_debt(program_id, liquidity_amount, accounts)
        }
        LendingInstruction::UpdateMarketMetadata => {
            msg!("Instruction: Update Metadata");
            let metadata = LendingMarketMetadata::new_from_bytes(input)?;
            process_update_market_metadata(program_id, metadata, accounts)
        }
        LendingInstruction::SetObligationCloseabilityStatus { closeable } => {
            msg!("Instruction: Mark Obligation As Closable");
            process_set_obligation_closeability_status(program_id, closeable, accounts)
        }
        LendingInstruction::DonateToReserve { liquidity_amount } => {
            msg!("Instruction: Donate To Reserve");
            process_donate_to_reserve(program_id, liquidity_amount, accounts)
        }
    }
}

fn process_init_lending_market(
    program_id: &Pubkey,
    owner: Pubkey,
    quote_currency: [u8; 32],
    accounts: &[AccountInfo],
) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();
    let lending_market_info = next_account_info(account_info_iter)?;
    let rent = &Rent::from_account_info(next_account_info(account_info_iter)?)?;
    let token_program_id = next_account_info(account_info_iter)?;
    let oracle_program_id = next_account_info(account_info_iter)?;
    let switchboard_oracle_program_id = next_account_info(account_info_iter)?;

    assert_rent_exempt(rent, lending_market_info)?;
    let mut lending_market = assert_uninitialized::<LendingMarket>(lending_market_info)?;
    if lending_market_info.owner != program_id {
        msg!("Lending market provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }

    lending_market.init(InitLendingMarketParams {
        bump_seed: Pubkey::find_program_address(&[lending_market_info.key.as_ref()], program_id).1,
        owner,
        quote_currency,
        token_program_id: *token_program_id.key,
        oracle_program_id: *oracle_program_id.key,
        switchboard_oracle_program_id: *switchboard_oracle_program_id.key,
    });
    LendingMarket::pack(lending_market, &mut lending_market_info.data.borrow_mut())?;

    Ok(())
}

#[inline(never)] // avoid stack frame limit
fn process_set_lending_market_owner_and_config(
    program_id: &Pubkey,
    new_owner: Pubkey,
    rate_limiter_config: RateLimiterConfig,
    whitelisted_liquidator: Option<Pubkey>,
    risk_authority: Pubkey,
    accounts: &[AccountInfo],
) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();
    let lending_market_info = next_account_info(account_info_iter)?;
    let market_change_authority_info = next_account_info(account_info_iter)?;

    let mut lending_market = LendingMarket::unpack(&lending_market_info.data.borrow())?;
    if lending_market_info.owner != program_id {
        msg!("Lending market provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }

    if !market_change_authority_info.is_signer {
        msg!("Lending market owner or risk authority provided must be a signer");
        return Err(LendingError::InvalidSigner.into());
    }

    if market_change_authority_info.key == &lending_market.owner {
        lending_market.owner = new_owner;
        lending_market.risk_authority = risk_authority;

        if rate_limiter_config != lending_market.rate_limiter.config {
            lending_market.rate_limiter = RateLimiter::new(rate_limiter_config, Clock::get()?.slot);
        }

        lending_market.whitelisted_liquidator = whitelisted_liquidator;
    } else if market_change_authority_info.key == &lending_market.risk_authority {
        // only can disable outflows
        if rate_limiter_config != lending_market.rate_limiter.config
            && rate_limiter_config.window_duration > 0
            && rate_limiter_config.max_outflow == 0
        {
            lending_market.rate_limiter = RateLimiter::new(rate_limiter_config, Clock::get()?.slot);
        }
    } else {
        msg!("Signer must be the lending market owner or risk authority");
        return Err(LendingError::InvalidMarketOwner.into());
    }

    LendingMarket::pack(lending_market, &mut lending_market_info.data.borrow_mut())?;

    Ok(())
}

fn process_init_reserve(
    program_id: &Pubkey,
    liquidity_amount: u64,
    config: ReserveConfig,
    accounts: &[AccountInfo],
) -> ProgramResult {
    if liquidity_amount == 0 {
        msg!("Reserve must be initialized with liquidity");
        return Err(LendingError::InvalidAmount.into());
    }
    validate_reserve_config(config)?;
    let account_info_iter = &mut accounts.iter();
    let source_liquidity_info = next_account_info(account_info_iter)?;
    let destination_collateral_info = next_account_info(account_info_iter)?;
    let reserve_info = next_account_info(account_info_iter)?;
    let reserve_liquidity_mint_info = next_account_info(account_info_iter)?;
    let reserve_liquidity_supply_info = next_account_info(account_info_iter)?;
    let reserve_liquidity_fee_receiver_info = next_account_info(account_info_iter)?;
    let reserve_collateral_mint_info = next_account_info(account_info_iter)?;
    let reserve_collateral_supply_info = next_account_info(account_info_iter)?;
    let pyth_product_info = next_account_info(account_info_iter)?;
    let pyth_price_info = next_account_info(account_info_iter)?;
    let switchboard_feed_info = next_account_info(account_info_iter)?;
    let lending_market_info = next_account_info(account_info_iter)?;
    let lending_market_authority_info = next_account_info(account_info_iter)?;
    let lending_market_owner_info = next_account_info(account_info_iter)?;
    let user_transfer_authority_info = next_account_info(account_info_iter)?;

    let clock = &Clock::get()?;

    let rent_info = next_account_info(account_info_iter)?;
    let rent = &Rent::from_account_info(rent_info)?;
    let token_program_id = next_account_info(account_info_iter)?;

    assert_rent_exempt(rent, reserve_info)?;
    let mut reserve = assert_uninitialized::<Reserve>(reserve_info)?;
    if reserve_info.owner != program_id {
        msg!(
            "Reserve provided is not owned by the lending program {} != {}",
            &reserve_info.owner.to_string(),
            &program_id.to_string(),
        );
        return Err(LendingError::InvalidAccountOwner.into());
    }

    if reserve_liquidity_supply_info.key == source_liquidity_info.key {
        msg!("Reserve liquidity supply cannot be used as the source liquidity provided");
        return Err(LendingError::InvalidAccountInput.into());
    }

    let lending_market = Box::new(LendingMarket::unpack(&lending_market_info.data.borrow())?);
    if lending_market_info.owner != program_id {
        msg!(
            "Lending market provided is not owned by the lending program  {} != {}",
            &lending_market_info.owner.to_string(),
            &program_id.to_string(),
        );
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &lending_market.token_program_id != token_program_id.key {
        msg!("Lending market token program does not match the token program provided");
        return Err(LendingError::InvalidTokenProgram.into());
    }
    if &lending_market.owner != lending_market_owner_info.key {
        msg!("Lending market owner does not match the lending market owner provided");
        return Err(LendingError::InvalidMarketOwner.into());
    }
    if !lending_market_owner_info.is_signer {
        msg!("Lending market owner provided must be a signer");
        return Err(LendingError::InvalidSigner.into());
    }
    if *switchboard_feed_info.key == solend_program::NULL_PUBKEY
        && (*pyth_price_info.key == solend_program::NULL_PUBKEY
            || *pyth_product_info.key == solend_program::NULL_PUBKEY)
    {
        msg!("Both price oracles are null. At least one must be non-null");
        return Err(LendingError::InvalidOracleConfig.into());
    }
    validate_pyth_keys(pyth_price_info)?;
    validate_switchboard_keys(switchboard_feed_info)?;

    if let Some(extra_oracle_pubkey) = config.extra_oracle_pubkey {
        let extra_oracle_info = next_account_info(account_info_iter)?;
        validate_extra_oracle(extra_oracle_pubkey, extra_oracle_info)?;
    }

    let (market_price, smoothed_market_price) =
        get_price(Some(switchboard_feed_info), pyth_price_info, clock)?;

    let authority_signer_seeds = &[
        lending_market_info.key.as_ref(),
        &[lending_market.bump_seed],
    ];
    let lending_market_authority_pubkey =
        Pubkey::create_program_address(authority_signer_seeds, program_id)?;
    if &lending_market_authority_pubkey != lending_market_authority_info.key {
        msg!(
            "Derived lending market authority does not match the lending market authority provided"
        );
        return Err(LendingError::InvalidMarketAuthority.into());
    }

    let reserve_liquidity_mint = unpack_mint(&reserve_liquidity_mint_info.data.borrow())?;
    if reserve_liquidity_mint_info.owner != token_program_id.key {
        msg!("Reserve liquidity mint is not owned by the token program provided");
        return Err(LendingError::InvalidTokenOwner.into());
    }

    reserve.init(InitReserveParams {
        current_slot: clock.slot,
        lending_market: *lending_market_info.key,
        liquidity: ReserveLiquidity::new(NewReserveLiquidityParams {
            mint_pubkey: *reserve_liquidity_mint_info.key,
            mint_decimals: reserve_liquidity_mint.decimals,
            supply_pubkey: *reserve_liquidity_supply_info.key,
            pyth_oracle_pubkey: *pyth_price_info.key,
            switchboard_oracle_pubkey: *switchboard_feed_info.key,
            market_price,
            smoothed_market_price: smoothed_market_price.unwrap_or(market_price),
        }),
        collateral: ReserveCollateral::new(NewReserveCollateralParams {
            mint_pubkey: *reserve_collateral_mint_info.key,
            supply_pubkey: *reserve_collateral_supply_info.key,
        }),
        config,
        rate_limiter_config: RateLimiterConfig::default(),
    });

    let collateral_amount = reserve.deposit_liquidity(liquidity_amount)?;
    Reserve::pack(reserve, &mut reserve_info.data.borrow_mut())?;

    spl_token_init_account(TokenInitializeAccountParams {
        account: reserve_liquidity_supply_info.clone(),
        mint: reserve_liquidity_mint_info.clone(),
        owner: lending_market_authority_info.clone(),
        rent: rent_info.clone(),
        token_program: token_program_id.clone(),
    })?;

    spl_token_init_account(TokenInitializeAccountParams {
        account: reserve_liquidity_fee_receiver_info.clone(),
        mint: reserve_liquidity_mint_info.clone(),
        owner: lending_market_authority_info.clone(),
        rent: rent_info.clone(),
        token_program: token_program_id.clone(),
    })?;

    spl_token_init_mint(TokenInitializeMintParams {
        mint: reserve_collateral_mint_info.clone(),
        authority: lending_market_authority_info.key,
        rent: rent_info.clone(),
        decimals: reserve_liquidity_mint.decimals,
        token_program: token_program_id.clone(),
    })?;

    spl_token_init_account(TokenInitializeAccountParams {
        account: reserve_collateral_supply_info.clone(),
        mint: reserve_collateral_mint_info.clone(),
        owner: lending_market_authority_info.clone(),
        rent: rent_info.clone(),
        token_program: token_program_id.clone(),
    })?;

    spl_token_init_account(TokenInitializeAccountParams {
        account: destination_collateral_info.clone(),
        mint: reserve_collateral_mint_info.clone(),
        owner: user_transfer_authority_info.clone(),
        rent: rent_info.clone(),
        token_program: token_program_id.clone(),
    })?;

    spl_token_transfer(TokenTransferParams {
        source: source_liquidity_info.clone(),
        destination: reserve_liquidity_supply_info.clone(),
        amount: liquidity_amount,
        authority: user_transfer_authority_info.clone(),
        authority_signer_seeds: &[],
        token_program: token_program_id.clone(),
    })?;

    spl_token_mint_to(TokenMintToParams {
        mint: reserve_collateral_mint_info.clone(),
        destination: destination_collateral_info.clone(),
        amount: collateral_amount,
        authority: lending_market_authority_info.clone(),
        authority_signer_seeds,
        token_program: token_program_id.clone(),
    })?;

    Ok(())
}

fn validate_extra_oracle(
    extra_oracle_pubkey: Pubkey,
    extra_oracle_info: &AccountInfo<'_>,
) -> Result<(), ProgramError> {
    if extra_oracle_pubkey == solend_program::NULL_PUBKEY {
        msg!("Extra oracle cannot equal the null pubkey");
        return Err(LendingError::InvalidOracleConfig.into());
    }

    if extra_oracle_info.key != &extra_oracle_pubkey {
        msg!("Extra oracle provided does not match the extra oracle pubkey in the config");
        return Err(LendingError::InvalidOracleConfig.into());
    }

    match get_oracle_type(extra_oracle_info)? {
        OracleType::Pyth => {
            validate_pyth_price_account_info(extra_oracle_info)?;
        }
        OracleType::PythPull => {
            validate_pyth_price_account_info(extra_oracle_info)?;
        }
        OracleType::Switchboard => {
            validate_switchboard_keys(extra_oracle_info)?;
        }
        OracleType::SbOnDemand => {
            validate_sb_on_demand_keys(extra_oracle_info)?;
        }
    }

    Ok(())
}

fn process_refresh_reserve(program_id: &Pubkey, accounts: &[AccountInfo]) -> ProgramResult {
    let account_info_iter = &mut accounts.iter().peekable();
    let reserve_info = next_account_info(account_info_iter)?;
    let pyth_price_info = next_account_info(account_info_iter)?;
    let switchboard_feed_info = next_account_info(account_info_iter)?;
    let clock = &Clock::get()?;

    let extra_oracle_account_info = next_account_info(account_info_iter).ok();
    _refresh_reserve(
        program_id,
        reserve_info,
        pyth_price_info,
        Some(switchboard_feed_info),
        clock,
        extra_oracle_account_info,
    )
}

fn _refresh_reserve<'a>(
    program_id: &Pubkey,
    reserve_info: &AccountInfo<'a>,
    pyth_price_info: &AccountInfo<'a>,
    switchboard_feed_info: Option<&AccountInfo<'a>>,
    clock: &Clock,
    extra_oracle_account_info: Option<&AccountInfo<'a>>,
) -> ProgramResult {
    let mut reserve = Box::new(Reserve::unpack(&reserve_info.data.borrow())?);
    if reserve_info.owner != program_id {
        msg!("Reserve provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &reserve.liquidity.pyth_oracle_pubkey != pyth_price_info.key {
        msg!("Reserve liquidity pyth oracle does not match the reserve liquidity pyth oracle provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    // the first check is to allow for the only passing in pyth case
    // TODO maybe change this to is_some_and later
    if switchboard_feed_info.is_some()
        && &reserve.liquidity.switchboard_oracle_pubkey != switchboard_feed_info.unwrap().key
    {
        msg!("Reserve liquidity switchboard oracle does not match the reserve liquidity switchboard oracle provided");
        return Err(LendingError::InvalidOracleConfig.into());
    }

    let (market_price, smoothed_market_price) =
        get_price(switchboard_feed_info, pyth_price_info, clock)?;

    reserve.liquidity.market_price = market_price.try_mul(reserve.price_scale())?;

    if let Some(smoothed_market_price) = smoothed_market_price {
        reserve.liquidity.smoothed_market_price =
            smoothed_market_price.try_mul(reserve.price_scale())?;
    }

    reserve.liquidity.extra_market_price = match reserve.config.extra_oracle_pubkey {
        None => None,

        Some(extra_oracle_pubkey) => match extra_oracle_account_info {
            Some(extra_oracle_account_info) => {
                if extra_oracle_account_info.key != &extra_oracle_pubkey {
                    msg!("Reserve extra oracle does not match the reserve extra oracle provided");
                    return Err(LendingError::InvalidAccountInput.into());
                }

                Some(get_single_price_unchecked(
                    extra_oracle_account_info,
                    clock,
                )?)
            }
            None => {
                msg!("Reserve extra oracle account info missing");
                return Err(LendingError::InvalidAccountInput.into());
            }
        },
    };

    // currently there's no way to support two prices without a pyth oracle. So if a reserve
    // only supports switchboard, reserve.smoothed_market_price == reserve.market_price
    if reserve.liquidity.pyth_oracle_pubkey == solend_program::NULL_PUBKEY {
        reserve.liquidity.smoothed_market_price = reserve.liquidity.market_price;
    }

    Reserve::pack(*reserve, &mut reserve_info.data.borrow_mut())?;

    _refresh_reserve_interest(program_id, reserve_info, clock)
}

/// Lite version of refresh_reserve that should be used when the oracle price doesn't need to be updated
/// BE CAREFUL WHEN USING THIS
fn _refresh_reserve_interest(
    program_id: &Pubkey,
    reserve_info: &AccountInfo<'_>,
    clock: &Clock,
) -> ProgramResult {
    let mut reserve = Box::new(Reserve::unpack(&reserve_info.data.borrow())?);
    if reserve_info.owner != program_id {
        msg!("Reserve provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }

    reserve.accrue_interest(clock.slot)?;
    reserve.last_update.update_slot(clock.slot);
    Reserve::pack(*reserve, &mut reserve_info.data.borrow_mut())?;

    Ok(())
}

fn process_deposit_reserve_liquidity(
    program_id: &Pubkey,
    liquidity_amount: u64,
    accounts: &[AccountInfo],
) -> ProgramResult {
    if liquidity_amount == 0 {
        msg!("Liquidity amount provided cannot be zero");
        return Err(LendingError::InvalidAmount.into());
    }

    let account_info_iter = &mut accounts.iter();
    let source_liquidity_info = next_account_info(account_info_iter)?;
    let destination_collateral_info = next_account_info(account_info_iter)?;
    let reserve_info = next_account_info(account_info_iter)?;
    let reserve_liquidity_supply_info = next_account_info(account_info_iter)?;
    let reserve_collateral_mint_info = next_account_info(account_info_iter)?;
    let lending_market_info = next_account_info(account_info_iter)?;
    let lending_market_authority_info = next_account_info(account_info_iter)?;
    let user_transfer_authority_info = next_account_info(account_info_iter)?;
    let clock = &Clock::get()?;
    let token_program_id = next_account_info(account_info_iter)?;

    _refresh_reserve_interest(program_id, reserve_info, clock)?;
    _deposit_reserve_liquidity(
        program_id,
        liquidity_amount,
        source_liquidity_info,
        destination_collateral_info,
        reserve_info,
        reserve_liquidity_supply_info,
        reserve_collateral_mint_info,
        lending_market_info,
        lending_market_authority_info,
        user_transfer_authority_info,
        clock,
        token_program_id,
    )?;

    Ok(())
}

#[allow(clippy::too_many_arguments)]
fn _deposit_reserve_liquidity<'a>(
    program_id: &Pubkey,
    liquidity_amount: u64,
    source_liquidity_info: &AccountInfo<'a>,
    destination_collateral_info: &AccountInfo<'a>,
    reserve_info: &AccountInfo<'a>,
    reserve_liquidity_supply_info: &AccountInfo<'a>,
    reserve_collateral_mint_info: &AccountInfo<'a>,
    lending_market_info: &AccountInfo<'a>,
    lending_market_authority_info: &AccountInfo<'a>,
    user_transfer_authority_info: &AccountInfo<'a>,
    clock: &Clock,
    token_program_id: &AccountInfo<'a>,
) -> Result<u64, ProgramError> {
    let lending_market = LendingMarket::unpack(&lending_market_info.data.borrow())?;
    if lending_market_info.owner != program_id {
        msg!("Lending market provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &lending_market.token_program_id != token_program_id.key {
        msg!("Lending market token program does not match the token program provided");
        return Err(LendingError::InvalidTokenProgram.into());
    }
    let mut reserve = Box::new(Reserve::unpack(&reserve_info.data.borrow())?);
    if reserve_info.owner != program_id {
        msg!("Reserve provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &reserve.lending_market != lending_market_info.key {
        msg!("Reserve lending market does not match the lending market provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &reserve.liquidity.supply_pubkey != reserve_liquidity_supply_info.key {
        msg!("Reserve liquidity supply does not match the reserve liquidity supply provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &reserve.collateral.mint_pubkey != reserve_collateral_mint_info.key {
        msg!("Reserve collateral mint does not match the reserve collateral mint provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &reserve.liquidity.supply_pubkey == source_liquidity_info.key {
        msg!("Reserve liquidity supply cannot be used as the source liquidity provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &reserve.collateral.supply_pubkey == destination_collateral_info.key {
        msg!("Reserve collateral supply cannot be used as the destination collateral provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if reserve.last_update.is_stale(clock.slot)? {
        msg!("Reserve is stale and must be refreshed in the current slot");
        return Err(LendingError::ReserveStale.into());
    }
    let authority_signer_seeds = &[
        lending_market_info.key.as_ref(),
        &[lending_market.bump_seed],
    ];
    let lending_market_authority_pubkey =
        Pubkey::create_program_address(authority_signer_seeds, program_id)?;
    if &lending_market_authority_pubkey != lending_market_authority_info.key {
        msg!(
            "Derived lending market authority {} does not match the lending market authority provided {}",
            &lending_market_authority_pubkey.to_string(),
            &lending_market_authority_info.key.to_string(),
        );
        return Err(LendingError::InvalidMarketAuthority.into());
    }

    if Decimal::from(liquidity_amount)
        .try_add(reserve.liquidity.total_supply()?)?
        .try_floor_u64()?
        > reserve.config.deposit_limit
    {
        msg!("Cannot deposit liquidity above the reserve deposit limit");
        return Err(LendingError::InvalidAmount.into());
    }

    let collateral_amount = reserve.deposit_liquidity(liquidity_amount)?;
    reserve.last_update.mark_stale();
    Reserve::pack(*reserve, &mut reserve_info.data.borrow_mut())?;

    spl_token_transfer(TokenTransferParams {
        source: source_liquidity_info.clone(),
        destination: reserve_liquidity_supply_info.clone(),
        amount: liquidity_amount,
        authority: user_transfer_authority_info.clone(),
        authority_signer_seeds: &[],
        token_program: token_program_id.clone(),
    })?;

    spl_token_mint_to(TokenMintToParams {
        mint: reserve_collateral_mint_info.clone(),
        destination: destination_collateral_info.clone(),
        amount: collateral_amount,
        authority: lending_market_authority_info.clone(),
        authority_signer_seeds,
        token_program: token_program_id.clone(),
    })?;

    Ok(collateral_amount)
}

fn process_redeem_reserve_collateral(
    program_id: &Pubkey,
    collateral_amount: u64,
    accounts: &[AccountInfo],
) -> ProgramResult {
    if collateral_amount == 0 {
        msg!("Collateral amount provided cannot be zero");
        return Err(LendingError::InvalidAmount.into());
    }

    let account_info_iter = &mut accounts.iter();
    let source_collateral_info = next_account_info(account_info_iter)?;
    let destination_liquidity_info = next_account_info(account_info_iter)?;
    let reserve_info = next_account_info(account_info_iter)?;
    let reserve_collateral_mint_info = next_account_info(account_info_iter)?;
    let reserve_liquidity_supply_info = next_account_info(account_info_iter)?;
    let lending_market_info = next_account_info(account_info_iter)?;
    let lending_market_authority_info = next_account_info(account_info_iter)?;
    let user_transfer_authority_info = next_account_info(account_info_iter)?;
    let clock = &Clock::get()?;
    let token_program_id = next_account_info(account_info_iter)?;

    _refresh_reserve_interest(program_id, reserve_info, clock)?;
    _redeem_reserve_collateral(
        program_id,
        collateral_amount,
        source_collateral_info,
        destination_liquidity_info,
        reserve_info,
        reserve_collateral_mint_info,
        reserve_liquidity_supply_info,
        lending_market_info,
        lending_market_authority_info,
        user_transfer_authority_info,
        clock,
        token_program_id,
        true,
    )?;
    let mut reserve = Box::new(Reserve::unpack(&reserve_info.data.borrow())?);
    reserve.last_update.mark_stale();
    Reserve::pack(*reserve, &mut reserve_info.data.borrow_mut())?;

    Ok(())
}

#[allow(clippy::too_many_arguments)]
fn _redeem_reserve_collateral<'a>(
    program_id: &Pubkey,
    collateral_amount: u64,
    source_collateral_info: &AccountInfo<'a>,
    destination_liquidity_info: &AccountInfo<'a>,
    reserve_info: &AccountInfo<'a>,
    reserve_collateral_mint_info: &AccountInfo<'a>,
    reserve_liquidity_supply_info: &AccountInfo<'a>,
    lending_market_info: &AccountInfo<'a>,
    lending_market_authority_info: &AccountInfo<'a>,
    user_transfer_authority_info: &AccountInfo<'a>,
    clock: &Clock,
    token_program_id: &AccountInfo<'a>,
    check_rate_limits: bool,
) -> Result<u64, ProgramError> {
    let mut lending_market = LendingMarket::unpack(&lending_market_info.data.borrow())?;
    if lending_market_info.owner != program_id {
        msg!("Lending market provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &lending_market.token_program_id != token_program_id.key {
        msg!("Lending market token program does not match the token program provided");
        return Err(LendingError::InvalidTokenProgram.into());
    }

    let mut reserve = Box::new(Reserve::unpack(&reserve_info.data.borrow())?);
    if reserve_info.owner != program_id {
        msg!("Reserve provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &reserve.lending_market != lending_market_info.key {
        msg!("Reserve lending market does not match the lending market provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &reserve.collateral.mint_pubkey != reserve_collateral_mint_info.key {
        msg!("Reserve collateral mint does not match the reserve collateral mint provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &reserve.collateral.supply_pubkey == source_collateral_info.key {
        msg!("Reserve collateral supply cannot be used as the source collateral provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &reserve.liquidity.supply_pubkey != reserve_liquidity_supply_info.key {
        msg!("Reserve liquidity supply does not match the reserve liquidity supply provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &reserve.liquidity.supply_pubkey == destination_liquidity_info.key {
        msg!("Reserve liquidity supply cannot be used as the destination liquidity provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if reserve.last_update.is_stale(clock.slot)? {
        msg!("Reserve is stale and must be refreshed in the current slot");
        return Err(LendingError::ReserveStale.into());
    }

    let authority_signer_seeds = &[
        lending_market_info.key.as_ref(),
        &[lending_market.bump_seed],
    ];
    let lending_market_authority_pubkey =
        Pubkey::create_program_address(authority_signer_seeds, program_id)?;
    if &lending_market_authority_pubkey != lending_market_authority_info.key {
        msg!(
            "Derived lending market authority does not match the lending market authority provided"
        );
        return Err(LendingError::InvalidMarketAuthority.into());
    }

    let liquidity_amount = reserve.redeem_collateral(collateral_amount)?;

    if check_rate_limits {
        lending_market
            .rate_limiter
            .update(
                clock.slot,
                reserve.market_value_upper_bound(Decimal::from(liquidity_amount))?,
            )
            .map_err(|err| {
                msg!("Market outflow limit exceeded! Please try again later.");
                err
            })?;

        reserve
            .rate_limiter
            .update(clock.slot, Decimal::from(liquidity_amount))
            .map_err(|err| {
                msg!("Reserve outflow limit exceeded! Please try again later.");
                err
            })?;
    }

    reserve.last_update.mark_stale();
    Reserve::pack(*reserve, &mut reserve_info.data.borrow_mut())?;
    LendingMarket::pack(lending_market, &mut lending_market_info.data.borrow_mut())?;

    spl_token_burn(TokenBurnParams {
        mint: reserve_collateral_mint_info.clone(),
        source: source_collateral_info.clone(),
        amount: collateral_amount,
        authority: user_transfer_authority_info.clone(),
        authority_signer_seeds: &[],
        token_program: token_program_id.clone(),
    })?;

    spl_token_transfer(TokenTransferParams {
        source: reserve_liquidity_supply_info.clone(),
        destination: destination_liquidity_info.clone(),
        amount: liquidity_amount,
        authority: lending_market_authority_info.clone(),
        authority_signer_seeds,
        token_program: token_program_id.clone(),
    })?;

    Ok(liquidity_amount)
}

#[inline(never)] // avoid stack frame limit
fn process_init_obligation(program_id: &Pubkey, accounts: &[AccountInfo]) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();
    let obligation_info = next_account_info(account_info_iter)?;
    let lending_market_info = next_account_info(account_info_iter)?;
    let obligation_owner_info = next_account_info(account_info_iter)?;
    let clock = &Clock::get()?;
    let rent = &Rent::from_account_info(next_account_info(account_info_iter)?)?;
    let token_program_id = next_account_info(account_info_iter)?;

    assert_rent_exempt(rent, obligation_info)?;
    let mut obligation = assert_uninitialized::<Obligation>(obligation_info)?;
    if obligation_info.owner != program_id {
        msg!("Obligation provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }

    let lending_market = LendingMarket::unpack(&lending_market_info.data.borrow())?;
    if lending_market_info.owner != program_id {
        msg!("Lending market provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &lending_market.token_program_id != token_program_id.key {
        msg!("Lending market token program does not match the token program provided");
        return Err(LendingError::InvalidTokenProgram.into());
    }

    if !obligation_owner_info.is_signer {
        msg!("Obligation owner provided must be a signer");
        return Err(LendingError::InvalidSigner.into());
    }

    obligation.init(InitObligationParams {
        current_slot: clock.slot,
        lending_market: *lending_market_info.key,
        owner: *obligation_owner_info.key,
        deposits: vec![],
        borrows: vec![],
    });
    Obligation::pack(obligation, &mut obligation_info.data.borrow_mut())?;

    Ok(())
}

#[inline(never)] // avoid stack frame limit
fn process_refresh_obligation(program_id: &Pubkey, accounts: &[AccountInfo]) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();
    let obligation_info = next_account_info(account_info_iter)?;
    let clock = &Clock::get()?;

    let mut obligation = Obligation::unpack(&obligation_info.data.borrow())?;
    if obligation_info.owner != program_id {
        msg!("Obligation provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }

    let mut deposited_value = Decimal::zero();
    let mut borrowed_value = Decimal::zero(); // weighted borrow value wrt borrow weights
    let mut unweighted_borrowed_value = Decimal::zero();
    let mut borrowed_value_upper_bound = Decimal::zero();
    let mut allowed_borrow_value = Decimal::zero();
    let mut unhealthy_borrow_value = Decimal::zero();
    let mut super_unhealthy_borrow_value = Decimal::zero();

    for (index, collateral) in obligation.deposits.iter_mut().enumerate() {
        let deposit_reserve_info = next_account_info(account_info_iter)?;
        if deposit_reserve_info.owner != program_id {
            msg!(
                "Deposit reserve provided for collateral {} is not owned by the lending program",
                index
            );
            return Err(LendingError::InvalidAccountOwner.into());
        }
        if collateral.deposit_reserve != *deposit_reserve_info.key {
            msg!(
                "Deposit reserve of collateral {} does not match the deposit reserve provided",
                index
            );
            return Err(LendingError::InvalidAccountInput.into());
        }

        let deposit_reserve = Box::new(Reserve::unpack(&deposit_reserve_info.data.borrow())?);
        if deposit_reserve.last_update.is_stale(clock.slot)? {
            msg!(
                "Deposit reserve provided for collateral {} is stale and must be refreshed in the current slot",
                index
            );
            return Err(LendingError::ReserveStale.into());
        }

        let liquidity_amount = deposit_reserve
            .collateral_exchange_rate()?
            .decimal_collateral_to_liquidity(collateral.deposited_amount.into())?;

        let market_value = deposit_reserve.market_value(liquidity_amount)?;
        let market_value_lower_bound =
            deposit_reserve.market_value_lower_bound(liquidity_amount)?;

        let loan_to_value_rate = Rate::from_percent(deposit_reserve.config.loan_to_value_ratio);
        let liquidation_threshold_rate =
            Rate::from_percent(deposit_reserve.config.liquidation_threshold);
        let max_liquidation_threshold_rate =
            Rate::from_percent(deposit_reserve.config.max_liquidation_threshold);

        collateral.market_value = market_value;
        deposited_value = deposited_value.try_add(market_value)?;
        allowed_borrow_value =
            allowed_borrow_value.try_add(market_value_lower_bound.try_mul(loan_to_value_rate)?)?;
        unhealthy_borrow_value =
            unhealthy_borrow_value.try_add(market_value.try_mul(liquidation_threshold_rate)?)?;
        super_unhealthy_borrow_value = super_unhealthy_borrow_value
            .try_add(market_value.try_mul(max_liquidation_threshold_rate)?)?;
    }

    let mut borrowing_isolated_asset = false;
    let mut max_borrow_weight = None;
    for (index, liquidity) in obligation.borrows.iter_mut().enumerate() {
        let borrow_reserve_info = next_account_info(account_info_iter)?;
        if borrow_reserve_info.owner != program_id {
            msg!(
                "Borrow reserve provided for liquidity {} is not owned by the lending program",
                index
            );
            return Err(LendingError::InvalidAccountOwner.into());
        }
        if liquidity.borrow_reserve != *borrow_reserve_info.key {
            msg!(
                "Borrow reserve of liquidity {} does not match the borrow reserve provided",
                index
            );
            return Err(LendingError::InvalidAccountInput.into());
        }

        let borrow_reserve = Box::new(Reserve::unpack(&borrow_reserve_info.data.borrow())?);
        if borrow_reserve.last_update.is_stale(clock.slot)? {
            msg!(
                "Borrow reserve provided for liquidity {} is stale and must be refreshed in the current slot",
                index
            );
            return Err(LendingError::ReserveStale.into());
        }

        if borrow_reserve.config.reserve_type == ReserveType::Isolated {
            borrowing_isolated_asset = true;
        }

        liquidity.accrue_interest(borrow_reserve.liquidity.cumulative_borrow_rate_wads)?;

        let borrow_weight_and_pubkey = (
            borrow_reserve.config.added_borrow_weight_bps,
            borrow_reserve_info.key,
        );
        max_borrow_weight = match max_borrow_weight {
            None => {
                if liquidity.borrowed_amount_wads > Decimal::zero() {
                    Some((borrow_weight_and_pubkey, index))
                } else {
                    None
                }
            }
            Some((max_borrow_weight_and_pubkey, _)) => {
                if liquidity.borrowed_amount_wads > Decimal::zero()
                    && borrow_weight_and_pubkey > max_borrow_weight_and_pubkey
                {
                    Some((borrow_weight_and_pubkey, index))
                } else {
                    max_borrow_weight
                }
            }
        };

        let market_value = borrow_reserve.market_value(liquidity.borrowed_amount_wads)?;
        let market_value_upper_bound =
            borrow_reserve.market_value_upper_bound(liquidity.borrowed_amount_wads)?;
        liquidity.market_value = market_value;

        borrowed_value =
            borrowed_value.try_add(market_value.try_mul(borrow_reserve.borrow_weight())?)?;
        borrowed_value_upper_bound = borrowed_value_upper_bound
            .try_add(market_value_upper_bound.try_mul(borrow_reserve.borrow_weight())?)?;
        unweighted_borrowed_value = unweighted_borrowed_value.try_add(market_value)?;
    }

    if account_info_iter.next().is_some() {
        msg!("Too many obligation deposit or borrow reserves provided");
        return Err(LendingError::InvalidAccountInput.into());
    }

    obligation.deposited_value = deposited_value;
    obligation.borrowed_value = borrowed_value;
    obligation.unweighted_borrowed_value = unweighted_borrowed_value;
    obligation.borrowed_value_upper_bound = borrowed_value_upper_bound;
    obligation.borrowing_isolated_asset = borrowing_isolated_asset;

    let global_unhealthy_borrow_value = Decimal::from(70000000u64);
    let global_allowed_borrow_value = Decimal::from(65000000u64);

    obligation.allowed_borrow_value = min(allowed_borrow_value, global_allowed_borrow_value);
    obligation.unhealthy_borrow_value = min(unhealthy_borrow_value, global_unhealthy_borrow_value);
    obligation.super_unhealthy_borrow_value =
        min(super_unhealthy_borrow_value, global_unhealthy_borrow_value);

    obligation.last_update.update_slot(clock.slot);

    let (_, close_exceeded) = update_borrow_attribution_values(&mut obligation, &accounts[1..])?;
    if close_exceeded.is_none() {
        obligation.closeable = false;
    }

    // move the ObligationLiquidity with the max borrow weight to the front
    if let Some((_, max_borrow_weight_index)) = max_borrow_weight {
        obligation.borrows.swap(0, max_borrow_weight_index);
    }

    // filter out ObligationCollaterals and ObligationLiquiditys with an amount of zero
    obligation
        .deposits
        .retain(|collateral| collateral.deposited_amount > 0);
    obligation
        .borrows
        .retain(|liquidity| liquidity.borrowed_amount_wads > Decimal::zero());

    Obligation::pack(obligation, &mut obligation_info.data.borrow_mut())?;

    Ok(())
}

/// This function updates the borrow attribution value on the ObligationCollateral and
/// the reserve.
///
/// Prerequisites:
/// - the collateral's market value must be refreshed
/// - the obligation's deposited_value must be refreshed
/// - the obligation's true_borrowed_value must be refreshed
///
/// Note that this function packs and unpacks deposit reserves.
fn update_borrow_attribution_values(
    obligation: &mut Obligation,
    deposit_reserve_infos: &[AccountInfo],
) -> Result<(Option<Pubkey>, Option<Pubkey>), ProgramError> {
    let deposit_infos = &mut deposit_reserve_infos.iter();

    let mut open_exceeded = None;
    let mut close_exceeded = None;

    for collateral in obligation.deposits.iter_mut() {
        let deposit_reserve_info = next_account_info(deposit_infos)?;
        let mut deposit_reserve = Reserve::unpack(&deposit_reserve_info.data.borrow())?;

        // sanity check
        if collateral.deposit_reserve != *deposit_reserve_info.key {
            msg!("Something went wrong, deposit reserve account mismatch");
            return Err(LendingError::InvalidAccountInput.into());
        }

        deposit_reserve.attributed_borrow_value = deposit_reserve
            .attributed_borrow_value
            .saturating_sub(collateral.attributed_borrow_value);

        if obligation.deposited_value > Decimal::zero() {
            collateral.attributed_borrow_value = collateral
                .market_value
                .try_mul(obligation.unweighted_borrowed_value)?
                .try_div(obligation.deposited_value)?
        } else {
            collateral.attributed_borrow_value = Decimal::zero();
        }

        deposit_reserve.attributed_borrow_value = deposit_reserve
            .attributed_borrow_value
            .try_add(collateral.attributed_borrow_value)?;

        if deposit_reserve.attributed_borrow_value
            > Decimal::from(deposit_reserve.config.attributed_borrow_limit_open)
        {
            open_exceeded = Some(*deposit_reserve_info.key);
        }
        if deposit_reserve.attributed_borrow_value
            > Decimal::from(deposit_reserve.config.attributed_borrow_limit_close)
        {
            close_exceeded = Some(*deposit_reserve_info.key);
        }

        Reserve::pack(deposit_reserve, &mut deposit_reserve_info.data.borrow_mut())?;
    }

    Ok((open_exceeded, close_exceeded))
}

#[inline(never)] // avoid stack frame limit
fn process_deposit_obligation_collateral(
    program_id: &Pubkey,
    collateral_amount: u64,
    accounts: &[AccountInfo],
) -> ProgramResult {
    if collateral_amount == 0 {
        msg!("Collateral amount provided cannot be zero");
        return Err(LendingError::InvalidAmount.into());
    }

    let account_info_iter = &mut accounts.iter();
    let source_collateral_info = next_account_info(account_info_iter)?;
    let destination_collateral_info = next_account_info(account_info_iter)?;
    let deposit_reserve_info = next_account_info(account_info_iter)?;
    let obligation_info = next_account_info(account_info_iter)?;
    let lending_market_info = next_account_info(account_info_iter)?;
    let obligation_owner_info = next_account_info(account_info_iter)?;
    let user_transfer_authority_info = next_account_info(account_info_iter)?;
    let clock = &Clock::get()?;
    let token_program_id = next_account_info(account_info_iter)?;
    _refresh_reserve_interest(program_id, deposit_reserve_info, clock)?;
    _deposit_obligation_collateral(
        program_id,
        collateral_amount,
        source_collateral_info,
        destination_collateral_info,
        deposit_reserve_info,
        obligation_info,
        lending_market_info,
        obligation_owner_info,
        user_transfer_authority_info,
        clock,
        token_program_id,
    )?;
    let mut reserve = Box::new(Reserve::unpack(&deposit_reserve_info.data.borrow())?);
    reserve.last_update.mark_stale();
    Reserve::pack(*reserve, &mut deposit_reserve_info.data.borrow_mut())?;
    Ok(())
}

#[allow(clippy::too_many_arguments)]
fn _deposit_obligation_collateral<'a>(
    program_id: &Pubkey,
    collateral_amount: u64,
    source_collateral_info: &AccountInfo<'a>,
    destination_collateral_info: &AccountInfo<'a>,
    deposit_reserve_info: &AccountInfo<'a>,
    obligation_info: &AccountInfo<'a>,
    lending_market_info: &AccountInfo<'a>,
    obligation_owner_info: &AccountInfo<'a>,
    user_transfer_authority_info: &AccountInfo<'a>,
    clock: &Clock,
    token_program_id: &AccountInfo<'a>,
) -> ProgramResult {
    let lending_market = LendingMarket::unpack(&lending_market_info.data.borrow())?;
    if lending_market_info.owner != program_id {
        msg!("Lending market provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &lending_market.token_program_id != token_program_id.key {
        msg!("Lending market token program does not match the token program provided");
        return Err(LendingError::InvalidTokenProgram.into());
    }

    let deposit_reserve = Box::new(Reserve::unpack(&deposit_reserve_info.data.borrow())?);
    if deposit_reserve_info.owner != program_id {
        msg!("Deposit reserve provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &deposit_reserve.lending_market != lending_market_info.key {
        msg!("Deposit reserve lending market does not match the lending market provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &deposit_reserve.collateral.supply_pubkey == source_collateral_info.key {
        msg!("Deposit reserve collateral supply cannot be used as the source collateral provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &deposit_reserve.collateral.supply_pubkey != destination_collateral_info.key {
        msg!(
            "Deposit reserve collateral supply must be used as the destination collateral provided"
        );
        return Err(LendingError::InvalidAccountInput.into());
    }
    if deposit_reserve.last_update.is_stale(clock.slot)? {
        msg!("Deposit reserve is stale and must be refreshed in the current slot");
        return Err(LendingError::ReserveStale.into());
    }

    let mut obligation = Obligation::unpack(&obligation_info.data.borrow())?;
    if obligation_info.owner != program_id {
        msg!("Obligation provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &obligation.lending_market != lending_market_info.key {
        msg!("Obligation lending market does not match the lending market provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &obligation.owner != obligation_owner_info.key {
        msg!("Obligation owner does not match the obligation owner provided");
        return Err(LendingError::InvalidObligationOwner.into());
    }
    if !obligation_owner_info.is_signer {
        msg!("Obligation owner provided must be a signer");
        return Err(LendingError::InvalidSigner.into());
    }

    obligation
        .find_or_add_collateral_to_deposits(*deposit_reserve_info.key)?
        .deposit(collateral_amount)?;
    obligation.last_update.mark_stale();
    Obligation::pack(obligation, &mut obligation_info.data.borrow_mut())?;
    spl_token_transfer(TokenTransferParams {
        source: source_collateral_info.clone(),
        destination: destination_collateral_info.clone(),
        amount: collateral_amount,
        authority: user_transfer_authority_info.clone(),
        authority_signer_seeds: &[],
        token_program: token_program_id.clone(),
    })?;
    Ok(())
}

#[inline(never)] // avoid stack frame limit
fn process_deposit_reserve_liquidity_and_obligation_collateral(
    program_id: &Pubkey,
    liquidity_amount: u64,
    accounts: &[AccountInfo],
) -> ProgramResult {
    if liquidity_amount == 0 {
        msg!("Liquidity amount provided cannot be zero");
        return Err(LendingError::InvalidAmount.into());
    }

    let account_info_iter = &mut accounts.iter();
    let source_liquidity_info = next_account_info(account_info_iter)?;
    let user_collateral_info = next_account_info(account_info_iter)?;
    let reserve_info = next_account_info(account_info_iter)?;
    let reserve_liquidity_supply_info = next_account_info(account_info_iter)?;
    let reserve_collateral_mint_info = next_account_info(account_info_iter)?;
    let lending_market_info = next_account_info(account_info_iter)?;
    let lending_market_authority_info = next_account_info(account_info_iter)?;
    let destination_collateral_info = next_account_info(account_info_iter)?;
    let obligation_info = next_account_info(account_info_iter)?;
    let obligation_owner_info = next_account_info(account_info_iter)?;
    let _pyth_price_info = next_account_info(account_info_iter)?;
    let _switchboard_feed_info = next_account_info(account_info_iter)?;
    let user_transfer_authority_info = next_account_info(account_info_iter)?;
    let clock = &Clock::get()?;
    let token_program_id = next_account_info(account_info_iter)?;

    _refresh_reserve_interest(program_id, reserve_info, clock)?;
    let collateral_amount = _deposit_reserve_liquidity(
        program_id,
        liquidity_amount,
        source_liquidity_info,
        user_collateral_info,
        reserve_info,
        reserve_liquidity_supply_info,
        reserve_collateral_mint_info,
        lending_market_info,
        lending_market_authority_info,
        user_transfer_authority_info,
        clock,
        token_program_id,
    )?;
    _refresh_reserve_interest(program_id, reserve_info, clock)?;
    _deposit_obligation_collateral(
        program_id,
        collateral_amount,
        user_collateral_info,
        destination_collateral_info,
        reserve_info,
        obligation_info,
        lending_market_info,
        obligation_owner_info,
        user_transfer_authority_info,
        clock,
        token_program_id,
    )?;
    // mark the reserve as stale to make sure no weird bugs happen
    let mut reserve = Box::new(Reserve::unpack(&reserve_info.data.borrow())?);
    reserve.last_update.mark_stale();
    Reserve::pack(*reserve, &mut reserve_info.data.borrow_mut())?;

    Ok(())
}

#[inline(never)] // avoid stack frame limit
fn process_withdraw_obligation_collateral(
    program_id: &Pubkey,
    collateral_amount: u64,
    accounts: &[AccountInfo],
) -> ProgramResult {
    if collateral_amount == 0 {
        msg!("Collateral amount provided cannot be zero");
        return Err(LendingError::InvalidAmount.into());
    }

    let account_info_iter = &mut accounts.iter();
    let source_collateral_info = next_account_info(account_info_iter)?;
    let destination_collateral_info = next_account_info(account_info_iter)?;
    let withdraw_reserve_info = next_account_info(account_info_iter)?;
    let obligation_info = next_account_info(account_info_iter)?;
    let lending_market_info = next_account_info(account_info_iter)?;
    let lending_market_authority_info = next_account_info(account_info_iter)?;
    let obligation_owner_info = next_account_info(account_info_iter)?;
    let clock = &Clock::get()?;
    let token_program_id = next_account_info(account_info_iter)?;
    _withdraw_obligation_collateral(
        program_id,
        collateral_amount,
        source_collateral_info,
        destination_collateral_info,
        withdraw_reserve_info,
        obligation_info,
        lending_market_info,
        lending_market_authority_info,
        obligation_owner_info,
        clock,
        token_program_id,
        false,
        &accounts[8..],
    )?;
    Ok(())
}

#[allow(clippy::too_many_arguments)]
fn _withdraw_obligation_collateral<'a>(
    program_id: &Pubkey,
    collateral_amount: u64,
    source_collateral_info: &AccountInfo<'a>,
    destination_collateral_info: &AccountInfo<'a>,
    withdraw_reserve_info: &AccountInfo<'a>,
    obligation_info: &AccountInfo<'a>,
    lending_market_info: &AccountInfo<'a>,
    lending_market_authority_info: &AccountInfo<'a>,
    obligation_owner_info: &AccountInfo<'a>,
    clock: &Clock,
    token_program_id: &AccountInfo<'a>,
    account_for_rate_limiter: bool,
    deposit_reserve_infos: &[AccountInfo],
) -> Result<u64, ProgramError> {
    let lending_market = LendingMarket::unpack(&lending_market_info.data.borrow())?;
    if lending_market_info.owner != program_id {
        msg!("Lending market provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &lending_market.token_program_id != token_program_id.key {
        msg!("Lending market token program does not match the token program provided");
        return Err(LendingError::InvalidTokenProgram.into());
    }

    let withdraw_reserve = Box::new(Reserve::unpack(&withdraw_reserve_info.data.borrow())?);
    let mut obligation = Obligation::unpack(&obligation_info.data.borrow())?;

    if withdraw_reserve_info.owner != program_id {
        msg!("Withdraw reserve provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &withdraw_reserve.lending_market != lending_market_info.key {
        msg!("Withdraw reserve lending market does not match the lending market provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &withdraw_reserve.collateral.supply_pubkey != source_collateral_info.key {
        msg!("Withdraw reserve collateral supply must be used as the source collateral provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &withdraw_reserve.collateral.supply_pubkey == destination_collateral_info.key {
        msg!("Withdraw reserve collateral supply cannot be used as the destination collateral provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if withdraw_reserve.last_update.is_stale(clock.slot)? && !obligation.borrows.is_empty() {
        msg!("Withdraw reserve is stale and must be refreshed in the current slot");
        return Err(LendingError::ReserveStale.into());
    }

    if obligation_info.owner != program_id {
        msg!("Obligation provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &obligation.lending_market != lending_market_info.key {
        msg!("Obligation lending market does not match the lending market provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &obligation.owner != obligation_owner_info.key {
        msg!("Obligation owner does not match the obligation owner provided");
        return Err(LendingError::InvalidObligationOwner.into());
    }
    if !obligation_owner_info.is_signer {
        msg!("Obligation owner provided must be a signer");
        return Err(LendingError::InvalidSigner.into());
    }
    if obligation.last_update.is_stale(clock.slot)? && !obligation.borrows.is_empty() {
        msg!("Obligation is stale and must be refreshed in the current slot");
        return Err(LendingError::ObligationStale.into());
    }

    let (collateral, collateral_index) =
        obligation.find_collateral_in_deposits(*withdraw_reserve_info.key)?;
    if collateral.deposited_amount == 0 {
        msg!("Collateral deposited amount is zero");
        return Err(LendingError::ObligationCollateralEmpty.into());
    }

    let authority_signer_seeds = &[
        lending_market_info.key.as_ref(),
        &[lending_market.bump_seed],
    ];
    let lending_market_authority_pubkey =
        Pubkey::create_program_address(authority_signer_seeds, program_id)?;
    if &lending_market_authority_pubkey != lending_market_authority_info.key {
        msg!(
            "Derived lending market authority does not match the lending market authority provided"
        );
        return Err(LendingError::InvalidMarketAuthority.into());
    }

    // account for lending market and reserve rate limiter when withdrawing. this is needed to
    // support max withdraws.
    let max_outflow_collateral_amount = if account_for_rate_limiter {
        let max_outflow_usd = lending_market
            .rate_limiter
            .clone() // remaining_outflow is a mutable call, but we don't have mutable access here
            .remaining_outflow(clock.slot)?;

        // min here bc this function can overflow if max_outflow_usd is u64::MAX
        // the actual value doesn't matter too much as long as its sensible
        let max_outflow_usd_capped = min(
            max_outflow_usd,
            Decimal::from(100_000_000_000u64), // enough USD to cover all requests
        );

        let max_lending_market_outflow_liquidity_amount =
            withdraw_reserve.usd_to_liquidity_amount_lower_bound(max_outflow_usd_capped)?;

        let max_reserve_outflow_liquidity_amount = withdraw_reserve
            .rate_limiter
            .clone()
            .remaining_outflow(clock.slot)?;

        let max_outflow_liquidity_amount = min(
            max_lending_market_outflow_liquidity_amount,
            max_reserve_outflow_liquidity_amount,
        );

        withdraw_reserve
            .collateral_exchange_rate()?
            .decimal_liquidity_to_collateral(max_outflow_liquidity_amount)?
            .try_floor_u64()?
    } else {
        u64::MAX
    };

    let max_withdraw_amount = obligation.max_withdraw_amount(collateral, &withdraw_reserve)?;
    let withdraw_amount = min(
        collateral_amount,
        min(max_withdraw_amount, max_outflow_collateral_amount),
    );

    if withdraw_amount == 0 {
        msg!("Maximum withdraw value is zero");
        return Err(LendingError::WithdrawTooLarge.into());
    }

    let withdraw_value = withdraw_reserve.market_value(
        withdraw_reserve
            .collateral_exchange_rate()?
            .decimal_collateral_to_liquidity(Decimal::from(withdraw_amount))?,
    )?;

    // update relevant values before updating borrow attribution values
    obligation.deposited_value = obligation.deposited_value.saturating_sub(withdraw_value);

    obligation.deposits[collateral_index].market_value = obligation.deposits[collateral_index]
        .market_value
        .saturating_sub(withdraw_value);

    let (open_exceeded, _) =
        update_borrow_attribution_values(&mut obligation, deposit_reserve_infos)?;
    if let Some(reserve_pubkey) = open_exceeded {
        msg!(
            "Open borrow attribution limit exceeded for reserve {:?}",
            reserve_pubkey
        );
        return Err(LendingError::BorrowAttributionLimitExceeded.into());
    }

    // obligation.withdraw must be called after updating borrow attribution values, since we can
    // lose information if an entire deposit is removed, making the former calculation incorrect
    obligation.withdraw(withdraw_amount, collateral_index)?;
    obligation.last_update.mark_stale();

    Obligation::pack(obligation, &mut obligation_info.data.borrow_mut())?;

    spl_token_transfer(TokenTransferParams {
        source: source_collateral_info.clone(),
        destination: destination_collateral_info.clone(),
        amount: withdraw_amount,
        authority: lending_market_authority_info.clone(),
        authority_signer_seeds,
        token_program: token_program_id.clone(),
    })?;

    Ok(withdraw_amount)
}

#[inline(never)] // avoid stack frame limit
fn process_borrow_obligation_liquidity(
    program_id: &Pubkey,
    liquidity_amount: u64,
    accounts: &[AccountInfo],
) -> ProgramResult {
    if liquidity_amount == 0 {
        msg!("Liquidity amount provided cannot be zero");
        return Err(LendingError::InvalidAmount.into());
    }

    let account_info_iter = &mut accounts.iter();
    let source_liquidity_info = next_account_info(account_info_iter)?;
    let destination_liquidity_info = next_account_info(account_info_iter)?;
    let borrow_reserve_info = next_account_info(account_info_iter)?;
    let borrow_reserve_liquidity_fee_receiver_info = next_account_info(account_info_iter)?;
    let obligation_info = next_account_info(account_info_iter)?;
    let lending_market_info = next_account_info(account_info_iter)?;
    let lending_market_authority_info = next_account_info(account_info_iter)?;
    let obligation_owner_info = next_account_info(account_info_iter)?;
    let clock = &Clock::get()?;
    let token_program_id = next_account_info(account_info_iter)?;

    let mut lending_market = LendingMarket::unpack(&lending_market_info.data.borrow())?;
    if lending_market_info.owner != program_id {
        msg!("Lending market provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &lending_market.token_program_id != token_program_id.key {
        msg!("Lending market token program does not match the token program provided");
        return Err(LendingError::InvalidTokenProgram.into());
    }

    let mut borrow_reserve = Box::new(Reserve::unpack(&borrow_reserve_info.data.borrow())?);
    if borrow_reserve_info.owner != program_id {
        msg!("Borrow reserve provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &borrow_reserve.lending_market != lending_market_info.key {
        msg!("Borrow reserve lending market does not match the lending market provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &borrow_reserve.liquidity.supply_pubkey != source_liquidity_info.key {
        msg!("Borrow reserve liquidity supply must be used as the source liquidity provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &borrow_reserve.liquidity.supply_pubkey == destination_liquidity_info.key {
        msg!(
            "Borrow reserve liquidity supply cannot be used as the destination liquidity provided"
        );
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &borrow_reserve.config.fee_receiver != borrow_reserve_liquidity_fee_receiver_info.key {
        msg!("Borrow reserve liquidity fee receiver does not match the borrow reserve liquidity fee receiver provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if borrow_reserve.last_update.is_stale(clock.slot)? {
        msg!("Borrow reserve is stale and must be refreshed in the current slot");
        return Err(LendingError::ReserveStale.into());
    }
    if liquidity_amount != u64::MAX
        && Decimal::from(liquidity_amount)
            .try_add(borrow_reserve.liquidity.borrowed_amount_wads)?
            .try_floor_u64()?
            > borrow_reserve.config.borrow_limit
    {
        msg!("Cannot borrow above the borrow limit");
        return Err(LendingError::InvalidAmount.into());
    }

    let mut obligation = Obligation::unpack(&obligation_info.data.borrow())?;
    if obligation_info.owner != program_id {
        msg!("Obligation provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &obligation.lending_market != lending_market_info.key {
        msg!("Obligation lending market does not match the lending market provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &obligation.owner != obligation_owner_info.key {
        msg!("Obligation owner does not match the obligation owner provided");
        return Err(LendingError::InvalidObligationOwner.into());
    }
    if !obligation_owner_info.is_signer {
        msg!("Obligation owner provided must be a signer");
        return Err(LendingError::InvalidSigner.into());
    }
    if obligation.last_update.is_stale(clock.slot)? {
        msg!("Obligation is stale and must be refreshed in the current slot");
        return Err(LendingError::ObligationStale.into());
    }
    if obligation.deposits.is_empty() {
        msg!("Obligation has no deposits to borrow against");
        return Err(LendingError::ObligationDepositsEmpty.into());
    }
    if obligation.deposited_value == Decimal::zero() {
        msg!("Obligation deposits have zero value");
        return Err(LendingError::ObligationDepositsZero.into());
    }

    let authority_signer_seeds = &[
        lending_market_info.key.as_ref(),
        &[lending_market.bump_seed],
    ];
    let lending_market_authority_pubkey =
        Pubkey::create_program_address(authority_signer_seeds, program_id)?;
    if &lending_market_authority_pubkey != lending_market_authority_info.key {
        msg!(
            "Derived lending market authority does not match the lending market authority provided"
        );
        return Err(LendingError::InvalidMarketAuthority.into());
    }

    match borrow_reserve.config.reserve_type {
        ReserveType::Isolated => match obligation.borrows.len() {
            0 => {}
            1 => {
                if &obligation.borrows[0].borrow_reserve != borrow_reserve_info.key {
                    msg!("If you want to borrow an isolated tier asset, there can't be any other borrows in your obligation");
                    return Err(LendingError::IsolatedTierAssetViolation.into());
                }
            }
            // it's possible that the obligation already has a borrow from this reserve (consider
            // case the where we change a reserve asset type from regular to isolated), but in that
            // case we don't want to let more borrows happen anyways.
            _ => {
                msg!("If you want to borrow an isolated tier asset, there can't be any other borrows in your obligation");
                return Err(LendingError::IsolatedTierAssetViolation.into());
            }
        },
        ReserveType::Regular => {
            if obligation.borrowing_isolated_asset {
                msg!(
                    "Cannot borrow a regular tier asset if you have an isolated tier asset borrow"
                );
                return Err(LendingError::IsolatedTierAssetViolation.into());
            }
        }
    };

    let remaining_borrow_value = obligation
        .remaining_borrow_value()
        .unwrap_or_else(|_| Decimal::zero());
    if remaining_borrow_value == Decimal::zero() {
        msg!("Remaining borrow value is zero");
        return Err(LendingError::BorrowTooLarge.into());
    }

    let remaining_reserve_capacity = Decimal::from(borrow_reserve.config.borrow_limit)
        .try_sub(borrow_reserve.liquidity.borrowed_amount_wads)
        .unwrap_or_else(|_| Decimal::zero());

    // account for rate limiter restrictions when calculating max borrow amount.
    let max_outflow_liquidity_amount = {
        let max_outflow_usd = lending_market.rate_limiter.remaining_outflow(clock.slot)?;
        let max_outflow_tokens = borrow_reserve.rate_limiter.remaining_outflow(clock.slot)?;

        min(
            borrow_reserve.usd_to_liquidity_amount_lower_bound(min(
                max_outflow_usd,
                // min here bc this function can overflow if max_outflow_usd is u64::MAX
                remaining_borrow_value,
            ))?,
            max_outflow_tokens,
        )
    };

    let CalculateBorrowResult {
        borrow_amount,
        receive_amount,
        borrow_fee,
        host_fee,
    } = borrow_reserve.calculate_borrow(
        liquidity_amount,
        remaining_borrow_value,
        min(remaining_reserve_capacity, max_outflow_liquidity_amount),
    )?;

    if receive_amount == 0 {
        msg!("Borrow amount is too small to receive liquidity after fees");
        return Err(LendingError::BorrowTooSmall.into());
    }

    let cumulative_borrow_rate_wads = borrow_reserve.liquidity.cumulative_borrow_rate_wads;

    // check outflow rate limits
    {
        lending_market
            .rate_limiter
            .update(
                clock.slot,
                borrow_reserve.market_value_upper_bound(borrow_amount)?,
            )
            .map_err(|err| {
                msg!("Market outflow limit exceeded! Please try again later.");
                err
            })?;

        borrow_reserve
            .rate_limiter
            .update(clock.slot, borrow_amount)
            .map_err(|err| {
                msg!("Reserve outflow limit exceeded! Please try again later");
                err
            })?;
    }

    LendingMarket::pack(lending_market, &mut lending_market_info.data.borrow_mut())?;

    borrow_reserve.liquidity.borrow(borrow_amount)?;
    borrow_reserve.last_update.mark_stale();

    // updating these fields is needed to a correct borrow attribution value update later
    obligation.borrowed_value = obligation.borrowed_value.try_add(
        borrow_reserve
            .market_value(borrow_amount)?
            .try_mul(borrow_reserve.borrow_weight())?,
    )?;

    obligation.unweighted_borrowed_value = obligation
        .unweighted_borrowed_value
        .try_add(borrow_reserve.market_value(borrow_amount)?)?;

    Reserve::pack(*borrow_reserve, &mut borrow_reserve_info.data.borrow_mut())?;

    let obligation_liquidity = obligation
        .find_or_add_liquidity_to_borrows(*borrow_reserve_info.key, cumulative_borrow_rate_wads)?;

    obligation_liquidity.borrow(borrow_amount)?;
    obligation.last_update.mark_stale();

    let (open_exceeded, _) = update_borrow_attribution_values(&mut obligation, &accounts[9..])?;
    if let Some(reserve_pubkey) = open_exceeded {
        msg!(
            "Open borrow attribution limit exceeded for reserve {:?}",
            reserve_pubkey
        );
        return Err(LendingError::BorrowAttributionLimitExceeded.into());
    }

    // HACK: fast forward through the deposit reserve infos
    for _ in 0..obligation.deposits.len() {
        next_account_info(account_info_iter)?;
    }

    Obligation::pack(obligation, &mut obligation_info.data.borrow_mut())?;

    let mut owner_fee = borrow_fee;
    if let Ok(host_fee_receiver_info) = next_account_info(account_info_iter) {
        if host_fee > 0 {
            owner_fee = owner_fee
                .checked_sub(host_fee)
                .ok_or(LendingError::MathOverflow)?;

            spl_token_transfer(TokenTransferParams {
                source: source_liquidity_info.clone(),
                destination: host_fee_receiver_info.clone(),
                amount: host_fee,
                authority: lending_market_authority_info.clone(),
                authority_signer_seeds,
                token_program: token_program_id.clone(),
            })?;
        }
    }
    if owner_fee > 0 {
        spl_token_transfer(TokenTransferParams {
            source: source_liquidity_info.clone(),
            destination: borrow_reserve_liquidity_fee_receiver_info.clone(),
            amount: owner_fee,
            authority: lending_market_authority_info.clone(),
            authority_signer_seeds,
            token_program: token_program_id.clone(),
        })?;
    }

    spl_token_transfer(TokenTransferParams {
        source: source_liquidity_info.clone(),
        destination: destination_liquidity_info.clone(),
        amount: receive_amount,
        authority: lending_market_authority_info.clone(),
        authority_signer_seeds,
        token_program: token_program_id.clone(),
    })?;

    Ok(())
}

#[inline(never)] // avoid stack frame limit
fn process_repay_obligation_liquidity(
    program_id: &Pubkey,
    liquidity_amount: u64,
    accounts: &[AccountInfo],
) -> ProgramResult {
    if liquidity_amount == 0 {
        msg!("Liquidity amount provided cannot be zero");
        return Err(LendingError::InvalidAmount.into());
    }
    let account_info_iter = &mut accounts.iter();
    let source_liquidity_info = next_account_info(account_info_iter)?;
    let destination_liquidity_info = next_account_info(account_info_iter)?;
    let repay_reserve_info = next_account_info(account_info_iter)?;
    let obligation_info = next_account_info(account_info_iter)?;
    let lending_market_info = next_account_info(account_info_iter)?;
    let user_transfer_authority_info = next_account_info(account_info_iter)?;
    let clock = &Clock::get()?;
    let token_program_id = next_account_info(account_info_iter)?;

    let lending_market = LendingMarket::unpack(&lending_market_info.data.borrow())?;
    if lending_market_info.owner != program_id {
        msg!("Lending market provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &lending_market.token_program_id != token_program_id.key {
        msg!("Lending market token program does not match the token program provided");
        return Err(LendingError::InvalidTokenProgram.into());
    }

    _refresh_reserve_interest(program_id, repay_reserve_info, clock)?;
    let mut repay_reserve = Box::new(Reserve::unpack(&repay_reserve_info.data.borrow())?);
    if repay_reserve_info.owner != program_id {
        msg!("Repay reserve provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &repay_reserve.lending_market != lending_market_info.key {
        msg!("Repay reserve lending market does not match the lending market provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &repay_reserve.liquidity.supply_pubkey == source_liquidity_info.key {
        msg!("Repay reserve liquidity supply cannot be used as the source liquidity provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &repay_reserve.liquidity.supply_pubkey != destination_liquidity_info.key {
        msg!("Repay reserve liquidity supply must be used as the destination liquidity provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if repay_reserve.last_update.is_stale(clock.slot)? {
        msg!("Repay reserve is stale and must be refreshed in the current slot");
        return Err(LendingError::ReserveStale.into());
    }

    let mut obligation = Obligation::unpack(&obligation_info.data.borrow())?;
    if obligation_info.owner != program_id {
        msg!("Obligation provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &obligation.lending_market != lending_market_info.key {
        msg!("Obligation lending market does not match the lending market provided");
        return Err(LendingError::InvalidAccountInput.into());
    }

    let (liquidity, liquidity_index) =
        obligation.find_liquidity_in_borrows_mut(*repay_reserve_info.key)?;
    if liquidity.borrowed_amount_wads == Decimal::zero() {
        msg!("Liquidity borrowed amount is zero");
        return Err(LendingError::ObligationLiquidityEmpty.into());
    }

    // refreshing specific borrow instead of checking obligation stale
    liquidity.accrue_interest(repay_reserve.liquidity.cumulative_borrow_rate_wads)?;

    let CalculateRepayResult {
        settle_amount,
        repay_amount,
    } = repay_reserve.calculate_repay(liquidity_amount, liquidity.borrowed_amount_wads)?;

    if repay_amount == 0 {
        msg!("Repay amount is too small to transfer liquidity");
        return Err(LendingError::RepayTooSmall.into());
    }

    repay_reserve.liquidity.repay(repay_amount, settle_amount)?;
    repay_reserve.last_update.mark_stale();
    Reserve::pack(*repay_reserve, &mut repay_reserve_info.data.borrow_mut())?;

    obligation.repay(settle_amount, liquidity_index)?;
    obligation.last_update.mark_stale();
    Obligation::pack(obligation, &mut obligation_info.data.borrow_mut())?;

    spl_token_transfer(TokenTransferParams {
        source: source_liquidity_info.clone(),
        destination: destination_liquidity_info.clone(),
        amount: repay_amount,
        authority: user_transfer_authority_info.clone(),
        authority_signer_seeds: &[],
        token_program: token_program_id.clone(),
    })?;

    Ok(())
}

#[allow(clippy::too_many_arguments)]
fn _liquidate_obligation<'a>(
    program_id: &Pubkey,
    liquidity_amount: u64,
    source_liquidity_info: &AccountInfo<'a>,
    destination_collateral_info: &AccountInfo<'a>,
    repay_reserve_info: &AccountInfo<'a>,
    repay_reserve_liquidity_supply_info: &AccountInfo<'a>,
    withdraw_reserve_info: &AccountInfo<'a>,
    withdraw_reserve_collateral_supply_info: &AccountInfo<'a>,
    obligation_info: &AccountInfo<'a>,
    lending_market_info: &AccountInfo<'a>,
    lending_market_authority_info: &AccountInfo<'a>,
    user_transfer_authority_info: &AccountInfo<'a>,
    clock: &Clock,
    token_program_id: &AccountInfo<'a>,
) -> Result<(u64, Bonus), ProgramError> {
    let lending_market = Box::new(LendingMarket::unpack(&lending_market_info.data.borrow())?);
    if lending_market_info.owner != program_id {
        msg!("Lending market provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &lending_market.token_program_id != token_program_id.key {
        msg!("Lending market token program does not match the token program provided");
        return Err(LendingError::InvalidTokenProgram.into());
    }

    let mut repay_reserve = Box::new(Reserve::unpack(&repay_reserve_info.data.borrow())?);
    if repay_reserve_info.owner != program_id {
        msg!("Repay reserve provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &repay_reserve.lending_market != lending_market_info.key {
        msg!("Repay reserve lending market does not match the lending market provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &repay_reserve.liquidity.supply_pubkey != repay_reserve_liquidity_supply_info.key {
        msg!("Repay reserve liquidity supply does not match the repay reserve liquidity supply provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &repay_reserve.liquidity.supply_pubkey == source_liquidity_info.key {
        msg!("Repay reserve liquidity supply cannot be used as the source liquidity provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &repay_reserve.collateral.supply_pubkey == destination_collateral_info.key {
        msg!(
            "Repay reserve collateral supply cannot be used as the destination collateral provided"
        );
        return Err(LendingError::InvalidAccountInput.into());
    }
    if repay_reserve.last_update.is_stale(clock.slot)? {
        msg!("Repay reserve is stale and must be refreshed in the current slot");
        return Err(LendingError::ReserveStale.into());
    }

    let mut withdraw_reserve = Box::new(Reserve::unpack(&withdraw_reserve_info.data.borrow())?);
    if withdraw_reserve_info.owner != program_id {
        msg!("Withdraw reserve provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &withdraw_reserve.lending_market != lending_market_info.key {
        msg!("Withdraw reserve lending market does not match the lending market provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &withdraw_reserve.collateral.supply_pubkey != withdraw_reserve_collateral_supply_info.key {
        msg!("Withdraw reserve collateral supply does not match the withdraw reserve collateral supply provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &withdraw_reserve.liquidity.supply_pubkey == source_liquidity_info.key {
        msg!("Withdraw reserve liquidity supply cannot be used as the source liquidity provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &withdraw_reserve.collateral.supply_pubkey == destination_collateral_info.key {
        msg!("Withdraw reserve collateral supply cannot be used as the destination collateral provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if withdraw_reserve.last_update.is_stale(clock.slot)? {
        msg!("Withdraw reserve is stale and must be refreshed in the current slot");
        return Err(LendingError::ReserveStale.into());
    }

    let mut obligation = Obligation::unpack(&obligation_info.data.borrow())?;
    if obligation_info.owner != program_id {
        msg!("Obligation provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &obligation.lending_market != lending_market_info.key {
        msg!("Obligation lending market does not match the lending market provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if obligation.last_update.is_stale(clock.slot)? {
        msg!("Obligation is stale and must be refreshed in the current slot");
        return Err(LendingError::ObligationStale.into());
    }
    if obligation.deposited_value == Decimal::zero() {
        msg!("Obligation deposited value is zero");
        return Err(LendingError::ObligationDepositsZero.into());
    }
    if obligation.borrowed_value == Decimal::zero() {
        msg!("Obligation borrowed value is zero");
        return Err(LendingError::ObligationBorrowsZero.into());
    }

    if obligation.borrowed_value < obligation.unhealthy_borrow_value && !obligation.closeable {
        msg!("Obligation must be unhealthy or marked as closeable to be liquidated");
        return Err(LendingError::ObligationHealthy.into());
    }

    if let Some(liquidator) = lending_market.whitelisted_liquidator {
        if liquidator != *user_transfer_authority_info.key {
            msg!("Liquidator is not whitelisted");
            return Err(LendingError::NotWhitelistedLiquidator.into());
        }
    }

    let (liquidity, liquidity_index) =
        obligation.find_liquidity_in_borrows(*repay_reserve_info.key)?;
    if liquidity.market_value == Decimal::zero() {
        msg!("Obligation borrow value is zero");
        return Err(LendingError::ObligationLiquidityEmpty.into());
    }
    if liquidity_index != 0 {
        msg!("Obligation borrow is not the first liquidity in the borrows list");
        return Err(LendingError::InvalidAccountInput.into());
    }

    let (collateral, collateral_index) =
        obligation.find_collateral_in_deposits(*withdraw_reserve_info.key)?;
    if collateral.market_value == Decimal::zero() {
        msg!("Obligation deposit value is zero");
        return Err(LendingError::ObligationCollateralEmpty.into());
    }

    let authority_signer_seeds = &[
        lending_market_info.key.as_ref(),
        &[lending_market.bump_seed],
    ];
    let lending_market_authority_pubkey =
        Pubkey::create_program_address(authority_signer_seeds, program_id)?;
    if &lending_market_authority_pubkey != lending_market_authority_info.key {
        msg!(
            "Derived lending market authority does not match the lending market authority provided"
        );
        return Err(LendingError::InvalidMarketAuthority.into());
    }

    let bonus = withdraw_reserve.calculate_bonus(&obligation)?;
    let CalculateLiquidationResult {
        settle_amount,
        repay_amount,
        withdraw_amount,
    } = withdraw_reserve.calculate_liquidation(
        liquidity_amount,
        &obligation,
        liquidity,
        collateral,
        &bonus,
    )?;

    if repay_amount == 0 {
        msg!("Liquidation is too small to transfer liquidity");
        return Err(LendingError::LiquidationTooSmall.into());
    }
    if withdraw_amount == 0 {
        msg!("Liquidation is too small to receive collateral");
        return Err(LendingError::LiquidationTooSmall.into());
    }

    repay_reserve.liquidity.repay(repay_amount, settle_amount)?;
    repay_reserve.last_update.mark_stale();
    Reserve::pack(*repay_reserve, &mut repay_reserve_info.data.borrow_mut())?;

    // if there is a full withdraw here (which can happen on a full liquidation), then the borrow
    // attribution value needs to be updated on the reserve. note that we can't depend on
    // refresh_obligation to update this correctly because the ObligationCollateral object will be
    // deleted after this call.
    if withdraw_amount == collateral.deposited_amount {
        withdraw_reserve.attributed_borrow_value = withdraw_reserve
            .attributed_borrow_value
            .saturating_sub(collateral.market_value);

        Reserve::pack(
            *withdraw_reserve,
            &mut withdraw_reserve_info.data.borrow_mut(),
        )?;
    }

    obligation.repay(settle_amount, liquidity_index)?;
    obligation.withdraw(withdraw_amount, collateral_index)?;
    obligation.last_update.mark_stale();
    Obligation::pack(obligation, &mut obligation_info.data.borrow_mut())?;

    spl_token_transfer(TokenTransferParams {
        source: source_liquidity_info.clone(),
        destination: repay_reserve_liquidity_supply_info.clone(),
        amount: repay_amount,
        authority: user_transfer_authority_info.clone(),
        authority_signer_seeds: &[],
        token_program: token_program_id.clone(),
    })?;

    spl_token_transfer(TokenTransferParams {
        source: withdraw_reserve_collateral_supply_info.clone(),
        destination: destination_collateral_info.clone(),
        amount: withdraw_amount,
        authority: lending_market_authority_info.clone(),
        authority_signer_seeds,
        token_program: token_program_id.clone(),
    })?;

    Ok((withdraw_amount, bonus))
}

#[inline(never)] // avoid stack frame limit
fn process_liquidate_obligation_and_redeem_reserve_collateral(
    program_id: &Pubkey,
    liquidity_amount: u64,
    accounts: &[AccountInfo],
) -> ProgramResult {
    if liquidity_amount == 0 {
        msg!("Liquidity amount provided cannot be zero");
        return Err(LendingError::InvalidAmount.into());
    }

    let account_info_iter = &mut accounts.iter();
    let source_liquidity_info = next_account_info(account_info_iter)?;
    let destination_collateral_info = next_account_info(account_info_iter)?;
    let destination_liquidity_info = next_account_info(account_info_iter)?;
    let repay_reserve_info = next_account_info(account_info_iter)?;
    let repay_reserve_liquidity_supply_info = next_account_info(account_info_iter)?;
    let withdraw_reserve_info = next_account_info(account_info_iter)?;
    let withdraw_reserve_collateral_mint_info = next_account_info(account_info_iter)?;
    let withdraw_reserve_collateral_supply_info = next_account_info(account_info_iter)?;
    let withdraw_reserve_liquidity_supply_info = next_account_info(account_info_iter)?;
    let withdraw_reserve_liquidity_fee_receiver_info = next_account_info(account_info_iter)?;
    let obligation_info = next_account_info(account_info_iter)?;
    let lending_market_info = next_account_info(account_info_iter)?;
    let lending_market_authority_info = next_account_info(account_info_iter)?;
    let user_transfer_authority_info = next_account_info(account_info_iter)?;
    let token_program_id = next_account_info(account_info_iter)?;
    let clock = &Clock::get()?;

    let (withdrawn_collateral_amount, bonus) = _liquidate_obligation(
        program_id,
        liquidity_amount,
        source_liquidity_info,
        destination_collateral_info,
        repay_reserve_info,
        repay_reserve_liquidity_supply_info,
        withdraw_reserve_info,
        withdraw_reserve_collateral_supply_info,
        obligation_info,
        lending_market_info,
        lending_market_authority_info,
        user_transfer_authority_info,
        clock,
        token_program_id,
    )?;

    _refresh_reserve_interest(program_id, withdraw_reserve_info, clock)?;
    let withdraw_reserve = Box::new(Reserve::unpack(&withdraw_reserve_info.data.borrow())?);
    let collateral_exchange_rate = withdraw_reserve.collateral_exchange_rate()?;
    let max_redeemable_collateral = collateral_exchange_rate
        .liquidity_to_collateral(withdraw_reserve.liquidity.available_amount)?;
    let withdraw_collateral_amount = min(withdrawn_collateral_amount, max_redeemable_collateral);
    // if there is liquidity redeem it
    if withdraw_collateral_amount != 0 {
        let withdraw_liquidity_amount = _redeem_reserve_collateral(
            program_id,
            withdraw_collateral_amount,
            destination_collateral_info,
            destination_liquidity_info,
            withdraw_reserve_info,
            withdraw_reserve_collateral_mint_info,
            withdraw_reserve_liquidity_supply_info,
            lending_market_info,
            lending_market_authority_info,
            user_transfer_authority_info,
            clock,
            token_program_id,
            false,
        )?;
        let withdraw_reserve = Box::new(Reserve::unpack(&withdraw_reserve_info.data.borrow())?);
        if &withdraw_reserve.config.fee_receiver != withdraw_reserve_liquidity_fee_receiver_info.key
        {
            msg!("Withdraw reserve liquidity fee receiver does not match the reserve liquidity fee receiver provided");
            return Err(LendingError::InvalidAccountInput.into());
        }
        let protocol_fee = withdraw_reserve
            .calculate_protocol_liquidation_fee(withdraw_liquidity_amount, &bonus)?;

        spl_token_transfer(TokenTransferParams {
            source: destination_liquidity_info.clone(),
            destination: withdraw_reserve_liquidity_fee_receiver_info.clone(),
            amount: protocol_fee,
            authority: user_transfer_authority_info.clone(),
            authority_signer_seeds: &[],
            token_program: token_program_id.clone(),
        })?;
    }

    Ok(())
}

#[inline(never)] // avoid stack frame limit
fn process_withdraw_obligation_collateral_and_redeem_reserve_liquidity(
    program_id: &Pubkey,
    collateral_amount: u64,
    accounts: &[AccountInfo],
) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();
    let reserve_collateral_info = next_account_info(account_info_iter)?;
    let user_collateral_info = next_account_info(account_info_iter)?;
    let reserve_info = next_account_info(account_info_iter)?;
    let obligation_info = next_account_info(account_info_iter)?;
    let lending_market_info = next_account_info(account_info_iter)?;
    let lending_market_authority_info = next_account_info(account_info_iter)?;
    let user_liquidity_info = next_account_info(account_info_iter)?;
    let reserve_collateral_mint_info = next_account_info(account_info_iter)?;
    let reserve_liquidity_supply_info = next_account_info(account_info_iter)?;
    let obligation_owner_info = next_account_info(account_info_iter)?;
    let user_transfer_authority_info = next_account_info(account_info_iter)?;
    let clock = &Clock::get()?;
    let token_program_id = next_account_info(account_info_iter)?;

    let liquidity_amount = _withdraw_obligation_collateral(
        program_id,
        collateral_amount,
        reserve_collateral_info,
        user_collateral_info,
        reserve_info,
        obligation_info,
        lending_market_info,
        lending_market_authority_info,
        obligation_owner_info,
        clock,
        token_program_id,
        true,
        &accounts[12..],
    )?;

    // Needed in the case where the obligation has no borrows => user doesn't refresh anything
    // if the obligation has borrows, then withdraw_obligation_collateral ensures that the
    // obligation (and as a result, the reserves) were refreshed
    _refresh_reserve_interest(program_id, reserve_info, clock)?;
    _redeem_reserve_collateral(
        program_id,
        liquidity_amount,
        user_collateral_info,
        user_liquidity_info,
        reserve_info,
        reserve_collateral_mint_info,
        reserve_liquidity_supply_info,
        lending_market_info,
        lending_market_authority_info,
        user_transfer_authority_info,
        clock,
        token_program_id,
        true,
    )?;
    Ok(())
}

#[inline(never)] // avoid stack frame limit
fn process_update_reserve_config(
    program_id: &Pubkey,
    config: ReserveConfig,
    rate_limiter_config: RateLimiterConfig,
    accounts: &[AccountInfo],
) -> ProgramResult {
    validate_reserve_config(config)?;
    let account_info_iter = &mut accounts.iter();
    let reserve_info = next_account_info(account_info_iter)?;
    let lending_market_info = next_account_info(account_info_iter)?;
    let lending_market_authority_info = next_account_info(account_info_iter)?;
    let signer_info = next_account_info(account_info_iter)?;
    let _pyth_product_info = next_account_info(account_info_iter)?;
    let pyth_price_info = next_account_info(account_info_iter)?;
    let switchboard_feed_info = next_account_info(account_info_iter)?;

    let mut reserve = Box::new(Reserve::unpack(&reserve_info.data.borrow())?);
    if reserve_info.owner != program_id {
        msg!(
            "Reserve provided is not owned by the lending program {} != {}",
            &reserve_info.owner.to_string(),
            &program_id.to_string(),
        );
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &reserve.lending_market != lending_market_info.key {
        msg!("Reserve lending market does not match the lending market provided");
        return Err(LendingError::InvalidAccountInput.into());
    }

    let lending_market = Box::new(LendingMarket::unpack(&lending_market_info.data.borrow())?);
    if lending_market_info.owner != program_id {
        msg!(
            "Lending market provided is not owned by the lending program  {} != {}",
            &lending_market_info.owner.to_string(),
            &program_id.to_string(),
        );
        return Err(LendingError::InvalidAccountOwner.into());
    }

    // if it's a permissionless market
    if &solend_market_owner::id() != signer_info.key {
        if reserve.config.protocol_liquidation_fee != config.protocol_liquidation_fee {
            msg!("permissionless markets can't edit protocol liquidation fees");
            return Err(LendingError::InvalidConfig.into());
        }
        if reserve.config.protocol_take_rate != config.protocol_take_rate {
            msg!("permissionless markets can't edit protocol take rate");
            return Err(LendingError::InvalidConfig.into());
        }
        if reserve.config.fee_receiver != config.fee_receiver {
            msg!("permissionless markets can't edit fee receiver");
            return Err(LendingError::InvalidConfig.into());
        }
        if reserve.config.fees != config.fees {
            msg!("permissionless markets can't edit fee configs!");
            return Err(LendingError::InvalidConfig.into());
        }
    }

    let authority_signer_seeds = &[
        lending_market_info.key.as_ref(),
        &[lending_market.bump_seed],
    ];

    let lending_market_authority_pubkey =
        Pubkey::create_program_address(authority_signer_seeds, program_id)?;
    if &lending_market_authority_pubkey != lending_market_authority_info.key {
        msg!(
            "Derived lending market authority does not match the lending market authority provided"
        );
        return Err(LendingError::InvalidMarketAuthority.into());
    }

    if !signer_info.is_signer {
        msg!("Lending market owner or risk authority provided must be a signer");
        return Err(LendingError::InvalidSigner.into());
    }

    if signer_info.key == &lending_market.owner {
        // if window duration or max outflow are different, then create a new rate limiter instance.
        if rate_limiter_config != reserve.rate_limiter.config {
            reserve.rate_limiter = RateLimiter::new(rate_limiter_config, Clock::get()?.slot);
        }

        if *pyth_price_info.key != reserve.liquidity.pyth_oracle_pubkey {
            validate_pyth_keys(pyth_price_info)?;
            reserve.liquidity.pyth_oracle_pubkey = *pyth_price_info.key;
        }

        if *switchboard_feed_info.key != reserve.liquidity.switchboard_oracle_pubkey {
            validate_switchboard_keys(switchboard_feed_info)?;
            reserve.liquidity.switchboard_oracle_pubkey = *switchboard_feed_info.key;
        }
        if reserve.liquidity.switchboard_oracle_pubkey == solend_program::NULL_PUBKEY
            && reserve.liquidity.pyth_oracle_pubkey == solend_program::NULL_PUBKEY
        {
            msg!("At least one price oracle must have a non-null pubkey");
            return Err(LendingError::InvalidOracleConfig.into());
        }

        if let Some(extra_oracle_pubkey) = config.extra_oracle_pubkey {
            let extra_oracle_info = next_account_info(account_info_iter)?;
            validate_extra_oracle(extra_oracle_pubkey, extra_oracle_info)?;
        }

        reserve.config = config;
    } else if signer_info.key == &lending_market.risk_authority {
        // only can disable outflows
        if rate_limiter_config.window_duration > 0 && rate_limiter_config.max_outflow == 0 {
            reserve.rate_limiter = RateLimiter::new(rate_limiter_config, Clock::get()?.slot);
        }

        // only certain reserve config fields can be changed by the risk authority, and only in the
        // safer direction for now
        if config.borrow_limit < reserve.config.borrow_limit {
            reserve.config.borrow_limit = config.borrow_limit;
        }

        if config.deposit_limit < reserve.config.deposit_limit {
            reserve.config.deposit_limit = config.deposit_limit;
        }
    } else if *signer_info.key == solend_market_owner::id()
    // 5ph has the ability to change the
    // fees on permissionless markets
    {
        reserve.config.fees = config.fees;
        reserve.config.protocol_liquidation_fee = config.protocol_liquidation_fee;
        reserve.config.protocol_take_rate = config.protocol_take_rate;
        reserve.config.fee_receiver = config.fee_receiver;
    } else {
        msg!("Signer must be the Lending market owner or risk authority");
        return Err(LendingError::InvalidSigner.into());
    }

    reserve.last_update.mark_stale();
    Reserve::pack(*reserve, &mut reserve_info.data.borrow_mut())?;
    Ok(())
}

#[inline(never)] // avoid stack frame limit
fn process_redeem_fees(program_id: &Pubkey, accounts: &[AccountInfo]) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();
    let reserve_info = next_account_info(account_info_iter)?;
    let reserve_liquidity_fee_receiver_info = next_account_info(account_info_iter)?;
    let reserve_supply_liquidity_info = next_account_info(account_info_iter)?;
    let lending_market_info = next_account_info(account_info_iter)?;
    let lending_market_authority_info = next_account_info(account_info_iter)?;
    let token_program_id = next_account_info(account_info_iter)?;
    let clock = &Clock::get()?;

    let mut reserve = Box::new(Reserve::unpack(&reserve_info.data.borrow())?);
    if reserve_info.owner != program_id {
        msg!(
            "Reserve provided is not owned by the lending program {} != {}",
            &reserve_info.owner.to_string(),
            &program_id.to_string(),
        );
        return Err(LendingError::InvalidAccountOwner.into());
    }

    if &reserve.config.fee_receiver != reserve_liquidity_fee_receiver_info.key {
        msg!("Reserve liquidity fee receiver does not match the reserve liquidity fee receiver provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &reserve.liquidity.supply_pubkey != reserve_supply_liquidity_info.key {
        msg!("Reserve liquidity supply must be used as the reserve supply liquidity provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &reserve.lending_market != lending_market_info.key {
        msg!("Reserve lending market does not match the lending market provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if reserve.last_update.is_stale(clock.slot)? {
        msg!("reserve is stale and must be refreshed in the current slot");
        return Err(LendingError::ReserveStale.into());
    }

    let lending_market = LendingMarket::unpack(&lending_market_info.data.borrow())?;
    if lending_market_info.owner != program_id {
        msg!("Lending market provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &lending_market.token_program_id != token_program_id.key {
        msg!("Lending market token program does not match the token program provided");
        return Err(LendingError::InvalidTokenProgram.into());
    }
    let authority_signer_seeds = &[
        lending_market_info.key.as_ref(),
        &[lending_market.bump_seed],
    ];
    let lending_market_authority_pubkey =
        Pubkey::create_program_address(authority_signer_seeds, program_id)?;
    if &lending_market_authority_pubkey != lending_market_authority_info.key {
        msg!(
            "Derived lending market authority does not match the lending market authority provided"
        );
        return Err(LendingError::InvalidMarketAuthority.into());
    }

    let withdraw_amount = reserve.calculate_redeem_fees()?;
    if withdraw_amount == 0 {
        return Err(LendingError::InsufficientProtocolFeesToRedeem.into());
    }

    reserve.liquidity.redeem_fees(withdraw_amount)?;
    reserve.last_update.mark_stale();
    Reserve::pack(*reserve, &mut reserve_info.data.borrow_mut())?;

    spl_token_transfer(TokenTransferParams {
        source: reserve_supply_liquidity_info.clone(),
        destination: reserve_liquidity_fee_receiver_info.clone(),
        amount: withdraw_amount,
        authority: lending_market_authority_info.clone(),
        authority_signer_seeds,
        token_program: token_program_id.clone(),
    })?;

    Ok(())
}

fn process_flash_borrow_reserve_liquidity(
    program_id: &Pubkey,
    liquidity_amount: u64,
    accounts: &[AccountInfo],
) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();
    let source_liquidity_info = next_account_info(account_info_iter)?;
    let destination_liquidity_info = next_account_info(account_info_iter)?;
    let reserve_info = next_account_info(account_info_iter)?;
    let lending_market_info = next_account_info(account_info_iter)?;
    let lending_market_authority_info = next_account_info(account_info_iter)?;
    let sysvar_info = next_account_info(account_info_iter)?;
    let token_program_id = next_account_info(account_info_iter)?;
    let clock = Clock::get()?;

    _refresh_reserve_interest(program_id, reserve_info, &clock)?;
    _flash_borrow_reserve_liquidity(
        program_id,
        liquidity_amount,
        source_liquidity_info,
        destination_liquidity_info,
        reserve_info,
        lending_market_info,
        lending_market_authority_info,
        sysvar_info,
        token_program_id,
    )?;
    Ok(())
}

#[allow(clippy::too_many_arguments)]
fn _flash_borrow_reserve_liquidity<'a>(
    program_id: &Pubkey,
    liquidity_amount: u64,
    source_liquidity_info: &AccountInfo<'a>,
    destination_liquidity_info: &AccountInfo<'a>,
    reserve_info: &AccountInfo<'a>,
    lending_market_info: &AccountInfo<'a>,
    lending_market_authority_info: &AccountInfo<'a>,
    sysvar_info: &AccountInfo<'a>,
    token_program_id: &AccountInfo<'a>,
) -> ProgramResult {
    let lending_market = LendingMarket::unpack(&lending_market_info.data.borrow())?;
    if lending_market_info.owner != program_id {
        msg!("Lending market provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &lending_market.token_program_id != token_program_id.key {
        msg!("Lending market token program does not match the token program provided");
        return Err(LendingError::InvalidTokenProgram.into());
    }
    let mut reserve = Box::new(Reserve::unpack(&reserve_info.data.borrow())?);
    if reserve_info.owner != program_id {
        msg!("Reserve provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &reserve.lending_market != lending_market_info.key {
        msg!("Reserve lending market does not match the lending market provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &reserve.liquidity.supply_pubkey != source_liquidity_info.key {
        msg!("Borrow reserve liquidity supply must be used as the source liquidity provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &reserve.liquidity.supply_pubkey == destination_liquidity_info.key {
        msg!(
            "Borrow reserve liquidity supply cannot be used as the destination liquidity provided"
        );
        return Err(LendingError::InvalidAccountInput.into());
    }
    let authority_signer_seeds = &[
        lending_market_info.key.as_ref(),
        &[lending_market.bump_seed],
    ];
    let lending_market_authority_pubkey =
        Pubkey::create_program_address(authority_signer_seeds, program_id)?;
    if &lending_market_authority_pubkey != lending_market_authority_info.key {
        msg!(
            "Derived lending market authority {} does not match the lending market authority provided {}",
            &lending_market_authority_pubkey.to_string(),
            &lending_market_authority_info.key.to_string(),
        );
        return Err(LendingError::InvalidMarketAuthority.into());
    }

    if reserve.config.fees.flash_loan_fee_wad == u64::MAX {
        msg!("Flash loans are disabled for this reserve");
        return Err(LendingError::FlashLoansDisabled.into());
    }

    // Make sure this isnt a cpi call
    let current_index = load_current_index_checked(sysvar_info)? as usize;
    if is_cpi_call(program_id, current_index, sysvar_info)? {
        msg!("Flash Borrow was called via CPI!");
        return Err(LendingError::FlashBorrowCpi.into());
    }

    // Find and validate the flash repay instruction.
    //
    // 1. Ensure the instruction is for this program
    // 2. Ensure the instruction can be unpacked into a LendingInstruction
    // 3. Ensure that the reserve for the repay matches the borrow
    // 4. Ensure that there are no other flash instructions in the rest of the transaction
    // 5. Ensure that the repay amount matches the borrow amount
    //
    // If all of these conditions are not met, the flash borrow fails.
    let mut i = current_index;
    let mut found_repay_ix = false;

    loop {
        i += 1;

        let ixn = match load_instruction_at_checked(i, sysvar_info) {
            Ok(ix) => ix,
            Err(ProgramError::InvalidArgument) => break, // out of bounds
            Err(e) => {
                return Err(e);
            }
        };

        if ixn.program_id != *program_id {
            continue;
        }

        let unpacked = LendingInstruction::unpack(ixn.data.as_slice())?;
        match unpacked {
            LendingInstruction::FlashRepayReserveLiquidity {
                liquidity_amount: repay_liquidity_amount,
                borrow_instruction_index,
            } => {
                if found_repay_ix {
                    msg!("Multiple flash repays not allowed");
                    return Err(LendingError::MultipleFlashBorrows.into());
                }
                if ixn.accounts[4].pubkey != *reserve_info.key {
                    msg!("Invalid reserve account on flash repay");
                    return Err(LendingError::InvalidFlashRepay.into());
                }
                if repay_liquidity_amount != liquidity_amount {
                    msg!("Liquidity amount for flash repay doesn't match borrow");
                    return Err(LendingError::InvalidFlashRepay.into());
                }
                if (borrow_instruction_index as usize) != current_index {
                    msg!("Borrow instruction index {} for flash repay doesn't match current index {}", borrow_instruction_index, current_index);
                    return Err(LendingError::InvalidFlashRepay.into());
                }

                found_repay_ix = true;
            }
            LendingInstruction::FlashBorrowReserveLiquidity { .. } => {
                msg!("Multiple flash borrows not allowed");
                return Err(LendingError::MultipleFlashBorrows.into());
            }
            _ => (),
        };
    }

    if !found_repay_ix {
        msg!("No flash repay found");
        return Err(LendingError::NoFlashRepayFound.into());
    }

    reserve.liquidity.borrow(Decimal::from(liquidity_amount))?;
    reserve.last_update.mark_stale();
    Reserve::pack(*reserve, &mut reserve_info.data.borrow_mut())?;

    spl_token_transfer(TokenTransferParams {
        source: source_liquidity_info.clone(),
        destination: destination_liquidity_info.clone(),
        amount: liquidity_amount,
        authority: lending_market_authority_info.clone(),
        authority_signer_seeds,
        token_program: token_program_id.clone(),
    })?;

    Ok(())
}

fn process_flash_repay_reserve_liquidity(
    program_id: &Pubkey,
    liquidity_amount: u64,
    borrow_instruction_index: u8,
    accounts: &[AccountInfo],
) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();
    let source_liquidity_info = next_account_info(account_info_iter)?;
    let destination_liquidity_info = next_account_info(account_info_iter)?;
    let reserve_liquidity_fee_receiver_info = next_account_info(account_info_iter)?;
    let host_fee_receiver_info = next_account_info(account_info_iter)?;
    let reserve_info = next_account_info(account_info_iter)?;
    let lending_market_info = next_account_info(account_info_iter)?;
    let user_transfer_authority_info = next_account_info(account_info_iter)?;
    let sysvar_info = next_account_info(account_info_iter)?;
    let token_program_id = next_account_info(account_info_iter)?;

    _flash_repay_reserve_liquidity(
        program_id,
        liquidity_amount,
        borrow_instruction_index,
        source_liquidity_info,
        destination_liquidity_info,
        reserve_liquidity_fee_receiver_info,
        host_fee_receiver_info,
        reserve_info,
        lending_market_info,
        user_transfer_authority_info,
        sysvar_info,
        token_program_id,
    )?;
    Ok(())
}

#[allow(clippy::too_many_arguments)]
fn _flash_repay_reserve_liquidity<'a>(
    program_id: &Pubkey,
    liquidity_amount: u64,
    borrow_instruction_index: u8,
    source_liquidity_info: &AccountInfo<'a>,
    destination_liquidity_info: &AccountInfo<'a>,
    reserve_liquidity_fee_receiver_info: &AccountInfo<'a>,
    host_fee_receiver_info: &AccountInfo<'a>,
    reserve_info: &AccountInfo<'a>,
    lending_market_info: &AccountInfo<'a>,
    user_transfer_authority_info: &AccountInfo<'a>,
    sysvar_info: &AccountInfo<'a>,
    token_program_id: &AccountInfo<'a>,
) -> ProgramResult {
    let lending_market = LendingMarket::unpack(&lending_market_info.data.borrow())?;
    if lending_market_info.owner != program_id {
        msg!("Lending market provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &lending_market.token_program_id != token_program_id.key {
        msg!("Lending market token program does not match the token program provided");
        return Err(LendingError::InvalidTokenProgram.into());
    }
    let mut reserve = Box::new(Reserve::unpack(&reserve_info.data.borrow())?);
    if reserve_info.owner != program_id {
        msg!("Reserve provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &reserve.lending_market != lending_market_info.key {
        msg!("Reserve lending market does not match the lending market provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &reserve.liquidity.supply_pubkey != destination_liquidity_info.key {
        msg!("Reserve liquidity supply does not match the reserve liquidity supply provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &reserve.liquidity.supply_pubkey == source_liquidity_info.key {
        msg!("Reserve liquidity supply cannot be used as the source liquidity provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if &reserve.config.fee_receiver != reserve_liquidity_fee_receiver_info.key {
        msg!("Reserve liquidity fee receiver does not match the reserve liquidity fee receiver provided");
        return Err(LendingError::InvalidAccountInput.into());
    }

    let flash_loan_amount = liquidity_amount;

    let flash_loan_amount_decimal = Decimal::from(flash_loan_amount);
    let (origination_fee, host_fee) = reserve
        .config
        .fees
        .calculate_flash_loan_fees(flash_loan_amount_decimal)?;

    // Make sure this isnt a cpi call
    let current_index = load_current_index_checked(sysvar_info)? as usize;
    if is_cpi_call(program_id, current_index, sysvar_info)? {
        msg!("Flash Repay was called via CPI!");
        return Err(LendingError::FlashRepayCpi.into());
    }

    // validate flash borrow
    if (borrow_instruction_index as usize) > current_index {
        msg!(
            "Flash repay: borrow instruction index {} has to be less than current index {}",
            borrow_instruction_index,
            current_index
        );
        return Err(LendingError::InvalidFlashRepay.into());
    }

    let ixn = load_instruction_at_checked(borrow_instruction_index as usize, sysvar_info)?;
    if ixn.program_id != *program_id {
        msg!(
            "Flash repay: supplied instruction index {} doesn't belong to program id {}",
            borrow_instruction_index,
            *program_id
        );
        return Err(LendingError::InvalidFlashRepay.into());
    }

    let unpacked = LendingInstruction::unpack(ixn.data.as_slice())?;
    match unpacked {
        LendingInstruction::FlashBorrowReserveLiquidity {
            liquidity_amount: borrow_liquidity_amount,
        } => {
            // re-check everything here out of paranoia
            if ixn.accounts[2].pubkey != *reserve_info.key {
                msg!("Invalid reserve account on flash repay");
                return Err(LendingError::InvalidFlashRepay.into());
            }

            if liquidity_amount != borrow_liquidity_amount {
                msg!("Liquidity amount for flash repay doesn't match borrow");
                return Err(LendingError::InvalidFlashRepay.into());
            }
        }
        _ => {
            msg!("Flash repay: Supplied borrow instruction index is not a flash borrow");
            return Err(LendingError::InvalidFlashRepay.into());
        }
    };

    reserve
        .liquidity
        .repay(flash_loan_amount, flash_loan_amount_decimal)?;
    reserve.last_update.mark_stale();
    Reserve::pack(*reserve, &mut reserve_info.data.borrow_mut())?;

    spl_token_transfer(TokenTransferParams {
        source: source_liquidity_info.clone(),
        destination: destination_liquidity_info.clone(),
        amount: flash_loan_amount,
        authority: user_transfer_authority_info.clone(),
        authority_signer_seeds: &[],
        token_program: token_program_id.clone(),
    })?;

    if host_fee > 0 {
        spl_token_transfer(TokenTransferParams {
            source: source_liquidity_info.clone(),
            destination: host_fee_receiver_info.clone(),
            amount: host_fee,
            authority: user_transfer_authority_info.clone(),
            authority_signer_seeds: &[],
            token_program: token_program_id.clone(),
        })?;
    }

    if origination_fee > 0 {
        spl_token_transfer(TokenTransferParams {
            source: source_liquidity_info.clone(),
            destination: reserve_liquidity_fee_receiver_info.clone(),
            amount: origination_fee,
            authority: user_transfer_authority_info.clone(),
            authority_signer_seeds: &[],
            token_program: token_program_id.clone(),
        })?;
    }

    Ok(())
}

fn process_forgive_debt(
    program_id: &Pubkey,
    liquidity_amount: u64,
    accounts: &[AccountInfo],
) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();
    let obligation_info = next_account_info(account_info_iter)?;
    let reserve_info = next_account_info(account_info_iter)?;
    let lending_market_info = next_account_info(account_info_iter)?;
    let lending_market_owner_info = next_account_info(account_info_iter)?;

    let lending_market = LendingMarket::unpack(&lending_market_info.data.borrow())?;
    if lending_market_info.owner != program_id {
        msg!(
            "Lending market provided is not owned by the lending program  {} != {}",
            &lending_market_info.owner.to_string(),
            &program_id.to_string(),
        );
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &lending_market.owner != lending_market_owner_info.key {
        msg!("Lending market owner does not match the lending market owner provided");
        return Err(LendingError::InvalidMarketOwner.into());
    }
    if !lending_market_owner_info.is_signer {
        msg!("Lending market owner provided must be a signer");
        return Err(LendingError::InvalidSigner.into());
    }

    let mut reserve = Box::new(Reserve::unpack(&reserve_info.data.borrow())?);
    if reserve_info.owner != program_id {
        msg!("Reserve provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &reserve.lending_market != lending_market_info.key {
        msg!("Reserve lending market does not match the lending market provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if reserve.last_update.is_stale(Clock::get()?.slot)? {
        msg!("Reserve is stale and must be refreshed in the current slot");
        return Err(LendingError::ReserveStale.into());
    }

    let mut obligation = Obligation::unpack(&obligation_info.data.borrow())?;
    if obligation_info.owner != program_id {
        msg!("Obligation provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &obligation.lending_market != lending_market_info.key {
        msg!("Obligation lending market does not match the lending market provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if obligation.last_update.is_stale(Clock::get()?.slot)? {
        msg!("Obligation is stale and must be refreshed in the current slot");
        return Err(LendingError::ObligationStale.into());
    }
    if !obligation.deposits.is_empty() {
        msg!("Obligation hasn't been fully liquidated!");
        return Err(LendingError::InvalidAccountInput.into());
    }

    // in the case where the entire reserve got rugged for whatever reason, we still don't
    // want to forgive the entire reserve's supply because that'll mess with the ctoken ratio
    // and cause overflow/div by zero issues in other places. therefore, we want to make sure the ctoken
    // ratio is >= 1% after forgiveness.
    //
    // new ctoken ratio = (total_liquidity_supply - forgive_amount) / collateral_mint_supply >= 0.01
    // -> forgive_amount <= (total_liquidity_supply - collateral_mint_supply * 0.01)
    const MIN_CTOKEN_RATIO_PERCENT: u8 = 1;
    let max_forgive_amount = reserve.liquidity.total_supply()?.try_sub(
        Decimal::from(reserve.collateral.mint_total_supply)
            .try_mul(Decimal::from_percent(MIN_CTOKEN_RATIO_PERCENT))?,
    )?;

    let (liquidity, liquidity_index) = obligation.find_liquidity_in_borrows(*reserve_info.key)?;
    let forgive_amount = min(
        Decimal::from(liquidity_amount),
        min(liquidity.borrowed_amount_wads, max_forgive_amount),
    );

    reserve.liquidity.forgive_debt(forgive_amount)?;
    reserve.last_update.mark_stale();
    Reserve::pack(*reserve, &mut reserve_info.data.borrow_mut())?;

    obligation.repay(forgive_amount, liquidity_index)?;
    obligation.last_update.mark_stale();
    Obligation::pack(obligation, &mut obligation_info.data.borrow_mut())?;

    Ok(())
}

fn assert_rent_exempt(rent: &Rent, account_info: &AccountInfo) -> ProgramResult {
    if !rent.is_exempt(account_info.lamports(), account_info.data_len()) {
        msg!(
            "Rent exempt balance insufficient got {} expected {}",
            &account_info.lamports().to_string(),
            &rent.minimum_balance(account_info.data_len()).to_string(),
        );
        Err(LendingError::NotRentExempt.into())
    } else {
        Ok(())
    }
}

fn process_update_market_metadata(
    program_id: &Pubkey,
    metadata: &LendingMarketMetadata,
    accounts: &[AccountInfo],
) -> Result<(), ProgramError> {
    let account_info_iter = &mut accounts.iter();
    let lending_market_info = next_account_info(account_info_iter)?;
    let lending_market_owner_info = next_account_info(account_info_iter)?;
    let metadata_info = next_account_info(account_info_iter)?;

    let lending_market = LendingMarket::unpack(&lending_market_info.data.borrow())?;
    if lending_market_info.owner != program_id {
        msg!("Lending market provided is not owned by the lending program",);
        return Err(LendingError::InvalidAccountOwner.into());
    }

    if &lending_market.owner != lending_market_owner_info.key {
        msg!("Lending market owner does not match the lending market owner provided");
        return Err(LendingError::InvalidMarketOwner.into());
    }

    if !lending_market_owner_info.is_signer {
        msg!("Lending market owner provided must be a signer");
        return Err(LendingError::InvalidSigner.into());
    }

    let metadata_seeds = &[lending_market_info.key.as_ref(), b"MetaData"];
    let (metadata_key, bump_seed) = Pubkey::find_program_address(metadata_seeds, program_id);
    if metadata_key != *metadata_info.key {
        msg!("Provided metadata account does not match the expected derived address");
        return Err(LendingError::InvalidAccountInput.into());
    }

    if bump_seed != metadata.bump_seed {
        msg!("Provided bump seed does not match the expected derived bump seed");
        return Err(LendingError::InvalidAmount.into());
    }

    // initialize
    if metadata_info.data_is_empty() {
        msg!("Creating metadata account");

        invoke_signed(
            &create_account(
                lending_market_owner_info.key,
                metadata_info.key,
                Rent::get()?.minimum_balance(std::mem::size_of::<LendingMarketMetadata>()),
                std::mem::size_of::<LendingMarketMetadata>() as u64,
                program_id,
            ),
            &[lending_market_owner_info.clone(), metadata_info.clone()],
            &[&[lending_market_info.key.as_ref(), br"MetaData", &[bump_seed]]],
        )?;
    }

    if metadata_info.owner != program_id {
        msg!("Metadata provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }

    let mut metadata_account_data = metadata_info.try_borrow_mut_data()?;
    metadata_account_data.copy_from_slice(bytes_of(metadata));

    Ok(())
}

/// process mark obligation as closable
pub fn process_set_obligation_closeability_status(
    program_id: &Pubkey,
    closeable: bool,
    accounts: &[AccountInfo],
) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();
    let obligation_info = next_account_info(account_info_iter)?;
    let lending_market_info = next_account_info(account_info_iter)?;
    let reserve_info = next_account_info(account_info_iter)?;
    let signer_info = next_account_info(account_info_iter)?;
    let clock = Clock::get()?;

    let lending_market = LendingMarket::unpack(&lending_market_info.data.borrow())?;
    if lending_market_info.owner != program_id {
        msg!("Lending market provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }

    let reserve = Reserve::unpack(&reserve_info.data.borrow())?;
    if reserve_info.owner != program_id {
        msg!("Reserve provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &reserve.lending_market != lending_market_info.key {
        msg!("Reserve lending market does not match the lending market provided");
        return Err(LendingError::InvalidAccountInput.into());
    }

    if reserve.attributed_borrow_value < Decimal::from(reserve.config.attributed_borrow_limit_close)
    {
        msg!("Reserve attributed borrow value is below the attributed borrow limit");
        return Err(LendingError::BorrowAttributionLimitNotExceeded.into());
    }

    let mut obligation = Obligation::unpack(&obligation_info.data.borrow())?;
    if obligation_info.owner != program_id {
        msg!("Obligation provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }

    if &obligation.lending_market != lending_market_info.key {
        msg!("Obligation lending market does not match the lending market provided");
        return Err(LendingError::InvalidAccountInput.into());
    }
    if obligation.last_update.is_stale(clock.slot)? {
        msg!("Obligation is stale and must be refreshed");
        return Err(LendingError::ObligationStale.into());
    }

    if &lending_market.risk_authority != signer_info.key && &lending_market.owner != signer_info.key
    {
        msg!("Signer must be risk authority or lending market owner");
        return Err(LendingError::InvalidAccountInput.into());
    }

    if !signer_info.is_signer {
        msg!("Risk authority or lending market owner must be a signer");
        return Err(LendingError::InvalidSigner.into());
    }

    if obligation.borrowed_value == Decimal::zero() {
        msg!("Obligation borrowed value is zero");
        return Err(LendingError::ObligationBorrowsZero.into());
    }

    obligation
        .find_collateral_in_deposits(*reserve_info.key)
        .map_err(|_| {
            msg!("Obligation does not have a deposit for the reserve provided");
            LendingError::ObligationCollateralEmpty
        })?;

    obligation.closeable = closeable;

    Obligation::pack(obligation, &mut obligation_info.data.borrow_mut())?;

    Ok(())
}

/// process donate to reserve
pub fn process_donate_to_reserve(
    program_id: &Pubkey,
    liquidity_amount: u64,
    accounts: &[AccountInfo],
) -> ProgramResult {
    let account_info_iter = &mut accounts.iter();
    let source_liquidity_info = next_account_info(account_info_iter)?;
    let destination_liquidity_info = next_account_info(account_info_iter)?;
    let reserve_info = next_account_info(account_info_iter)?;
    let lending_market_info = next_account_info(account_info_iter)?;
    let user_transfer_authority_info = next_account_info(account_info_iter)?;
    let token_program_id = next_account_info(account_info_iter)?;
    let clock = &Clock::get()?;

    let lending_market = LendingMarket::unpack(&lending_market_info.data.borrow())?;
    if lending_market_info.owner != program_id {
        msg!("Lending market provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }
    if &lending_market.token_program_id != token_program_id.key {
        msg!("Lending market token program does not match the token program provided");
        return Err(LendingError::InvalidTokenProgram.into());
    }

    if reserve_info.owner != program_id {
        msg!("Lending market provided is not owned by the lending program");
        return Err(LendingError::InvalidAccountOwner.into());
    }

    let mut reserve = Box::new(Reserve::unpack(&reserve_info.data.borrow())?);
    if &reserve.lending_market != lending_market_info.key {
        msg!("Reserve lending market does not match the lending market provided");
        return Err(LendingError::InvalidAccountInput.into());
    }

    if &reserve.liquidity.supply_pubkey != destination_liquidity_info.key {
        msg!("Reserve liquidity supply does not match the reserve liquidity supply provided");
        return Err(LendingError::InvalidAccountInput.into());
    }

    if &reserve.liquidity.supply_pubkey == source_liquidity_info.key {
        msg!("Reserve liquidity supply cannot be used as the source liquidity provided");
        return Err(LendingError::InvalidAccountInput.into());
    }

    #[cfg(not(feature = "test-bpf"))]
    if *reserve_info.key != pubkey!("6LRNkS4Aq6VZ9Np36o7RDZ9aztWCePekMgiFgUNDhXXN") {
        msg!("Donate function is currently limited to JUP pool usdc");
        return Err(LendingError::InvalidAccountInput.into());
    }

    _refresh_reserve_interest(program_id, reserve_info, clock)?;

    reserve.liquidity.donate(liquidity_amount)?;
    spl_token_transfer(TokenTransferParams {
        source: source_liquidity_info.clone(),
        destination: destination_liquidity_info.clone(),
        amount: liquidity_amount,
        authority: user_transfer_authority_info.clone(),
        authority_signer_seeds: &[],
        token_program: token_program_id.clone(),
    })?;

    reserve.last_update.mark_stale();
    Reserve::pack(*reserve, &mut reserve_info.data.borrow_mut())?;

    Ok(())
}

fn assert_uninitialized<T: Pack + IsInitialized>(
    account_info: &AccountInfo,
) -> Result<T, ProgramError> {
    let account: T = T::unpack_unchecked(&account_info.data.borrow())?;
    if account.is_initialized() {
        Err(LendingError::AlreadyInitialized.into())
    } else {
        Ok(account)
    }
}

/// Unpacks a spl_token `Mint`.
fn unpack_mint(data: &[u8]) -> Result<Mint, LendingError> {
    Mint::unpack(data).map_err(|_| LendingError::InvalidTokenMint)
}

/// get_price tries to load the oracle price from pyth, and if it fails, uses switchboard.
/// The first element in the returned tuple is the market price, and the second is the optional
/// smoothed price (eg ema, twap).
fn get_price(
    secondary_price_account_info: Option<&AccountInfo>,
    main_price_account_info: &AccountInfo,
    clock: &Clock,
) -> Result<(Decimal, Option<Decimal>), ProgramError> {
    if let Ok(prices) = get_single_price(main_price_account_info, clock) {
        return Ok((prices.0, prices.1));
    }

    // if secondary was not passed in don't try to grab the price
    if let Some(secondary_price_account_info_unwrapped) = secondary_price_account_info {
        // TODO: add support for secondary smoothed prices. Probably need to add a new
        // secondary account per reserve.
        if let Ok(prices) = get_single_price(secondary_price_account_info_unwrapped, clock) {
            return Ok((prices.0, prices.1));
        }
    }

    Err(LendingError::InvalidOracleConfig.into())
}

/// Issue a spl_token `InitializeAccount` instruction.
#[inline(always)]
fn spl_token_init_account(params: TokenInitializeAccountParams<'_>) -> ProgramResult {
    let TokenInitializeAccountParams {
        account,
        mint,
        owner,
        rent,
        token_program,
    } = params;
    let ix = spl_token::instruction::initialize_account(
        token_program.key,
        account.key,
        mint.key,
        owner.key,
    )?;
    let result = invoke(&ix, &[account, mint, owner, rent, token_program]);
    result.map_err(|_| LendingError::TokenInitializeAccountFailed.into())
}

/// Issue a spl_token `InitializeMint` instruction.
#[inline(always)]
fn spl_token_init_mint(params: TokenInitializeMintParams<'_, '_>) -> ProgramResult {
    let TokenInitializeMintParams {
        mint,
        rent,
        authority,
        token_program,
        decimals,
    } = params;
    let ix = spl_token::instruction::initialize_mint(
        token_program.key,
        mint.key,
        authority,
        None,
        decimals,
    )?;
    let result = invoke(&ix, &[mint, rent, token_program]);
    result.map_err(|_| LendingError::TokenInitializeMintFailed.into())
}

/// Invoke signed unless signers seeds are empty
#[inline(always)]
fn invoke_optionally_signed(
    instruction: &Instruction,
    account_infos: &[AccountInfo],
    authority_signer_seeds: &[&[u8]],
) -> ProgramResult {
    if authority_signer_seeds.is_empty() {
        invoke(instruction, account_infos)
    } else {
        invoke_signed(instruction, account_infos, &[authority_signer_seeds])
    }
}

/// Issue a spl_token `Transfer` instruction.
#[inline(always)]
fn spl_token_transfer(params: TokenTransferParams<'_, '_>) -> ProgramResult {
    let TokenTransferParams {
        source,
        destination,
        authority,
        token_program,
        amount,
        authority_signer_seeds,
    } = params;
    let result = invoke_optionally_signed(
        &spl_token::instruction::transfer(
            token_program.key,
            source.key,
            destination.key,
            authority.key,
            &[],
            amount,
        )?,
        &[source, destination, authority, token_program],
        authority_signer_seeds,
    );

    result.map_err(|_| LendingError::TokenTransferFailed.into())
}

/// Issue a spl_token `MintTo` instruction.
fn spl_token_mint_to(params: TokenMintToParams<'_, '_>) -> ProgramResult {
    let TokenMintToParams {
        mint,
        destination,
        authority,
        token_program,
        amount,
        authority_signer_seeds,
    } = params;
    let result = invoke_optionally_signed(
        &spl_token::instruction::mint_to(
            token_program.key,
            mint.key,
            destination.key,
            authority.key,
            &[],
            amount,
        )?,
        &[mint, destination, authority, token_program],
        authority_signer_seeds,
    );
    result.map_err(|_| LendingError::TokenMintToFailed.into())
}

/// Issue a spl_token `Burn` instruction.
#[inline(always)]
fn spl_token_burn(params: TokenBurnParams<'_, '_>) -> ProgramResult {
    let TokenBurnParams {
        mint,
        source,
        authority,
        token_program,
        amount,
        authority_signer_seeds,
    } = params;
    let result = invoke_optionally_signed(
        &spl_token::instruction::burn(
            token_program.key,
            source.key,
            mint.key,
            authority.key,
            &[],
            amount,
        )?,
        &[source, mint, authority, token_program],
        authority_signer_seeds,
    );
    result.map_err(|_| LendingError::TokenBurnFailed.into())
}

fn is_cpi_call(
    program_id: &Pubkey,
    current_index: usize,
    sysvar_info: &AccountInfo,
) -> Result<bool, ProgramError> {
    // say the tx looks like:
    // ix 0
    //   - ix a
    //   - ix b
    //   - ix c
    // ix 1
    // and we call "load_current_index_checked" from b, we will get 0. And when we
    // load_instruction_at_checked(0), we will get ix 0.
    // tldr; instructions sysvar only stores top-level instructions, never CPI instructions.
    let current_ixn = load_instruction_at_checked(current_index, sysvar_info)?;

    // the current ixn must match the flash_* ix. otherwise, it's a CPI. Comparing program_ids is a
    // cheaper way of verifying this property, bc token-lending doesn't allow re-entrancy anywhere.
    if *program_id != current_ixn.program_id {
        return Ok(true);
    }

    if get_stack_height() > TRANSACTION_LEVEL_STACK_HEIGHT {
        return Ok(true);
    }

    Ok(false)
}

struct TokenInitializeMintParams<'a: 'b, 'b> {
    mint: AccountInfo<'a>,
    rent: AccountInfo<'a>,
    authority: &'b Pubkey,
    decimals: u8,
    token_program: AccountInfo<'a>,
}

struct TokenInitializeAccountParams<'a> {
    account: AccountInfo<'a>,
    mint: AccountInfo<'a>,
    owner: AccountInfo<'a>,
    rent: AccountInfo<'a>,
    token_program: AccountInfo<'a>,
}

struct TokenTransferParams<'a: 'b, 'b> {
    source: AccountInfo<'a>,
    destination: AccountInfo<'a>,
    amount: u64,
    authority: AccountInfo<'a>,
    authority_signer_seeds: &'b [&'b [u8]],
    token_program: AccountInfo<'a>,
}

struct TokenMintToParams<'a: 'b, 'b> {
    mint: AccountInfo<'a>,
    destination: AccountInfo<'a>,
    amount: u64,
    authority: AccountInfo<'a>,
    authority_signer_seeds: &'b [&'b [u8]],
    token_program: AccountInfo<'a>,
}

struct TokenBurnParams<'a: 'b, 'b> {
    mint: AccountInfo<'a>,
    source: AccountInfo<'a>,
    amount: u64,
    authority: AccountInfo<'a>,
    authority_signer_seeds: &'b [&'b [u8]],
    token_program: AccountInfo<'a>,
}