fltemp 0.1.0

Flash Trade - Solana Perpetuals Exchange
Documentation 
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//! GetExitPriceAndFee instruction handler

use {
    crate::state::{
        custody::Custody,
        oracle::OraclePrice,
        perpetuals::{Perpetuals, PriceAndFee},
        pool::Pool,
        position::Position,
    },
    anchor_lang::prelude::*,
};

#[derive(Accounts)]
pub struct GetExitPriceAndFee<'info> {
    #[account(
        seeds = [b"perpetuals"],
        bump = perpetuals.perpetuals_bump
    )]
    pub perpetuals: Box<Account<'info, Perpetuals>>,

    #[account(
        seeds = [b"pool",
                 pool.name.as_bytes()],
        bump = pool.bump
    )]
    pub pool: Box<Account<'info, Pool>>,

    #[account(
        seeds = [b"position",
                 position.owner.as_ref(),
                 pool.key().as_ref(),
                 custody.key().as_ref(),
                 &[position.side as u8]],
        bump = position.bump
    )]
    pub position: Box<Account<'info, Position>>,

    #[account(
        seeds = [b"custody",
                 pool.key().as_ref(),
                 custody.mint.as_ref()],
        bump = custody.bump
    )]
    pub custody: Box<Account<'info, Custody>>,

    /// CHECK: oracle account for the collateral token
    #[account(
        constraint = custody_oracle_account.key() == custody.oracle.oracle_account
    )]
    pub custody_oracle_account: AccountInfo<'info>,
}

#[derive(AnchorSerialize, AnchorDeserialize)]
pub struct GetExitPriceAndFeeParams {}

pub fn get_exit_price_and_fee(
    ctx: Context<GetExitPriceAndFee>,
    _params: &GetExitPriceAndFeeParams,
) -> Result<PriceAndFee> {
    // compute exit price and fee
    let position = &ctx.accounts.position;
    let pool = &ctx.accounts.pool;
    let curtime = ctx.accounts.perpetuals.get_time()?;
    let custody = ctx.accounts.custody.as_mut();

    let token_price = OraclePrice::new_from_oracle(
        custody.oracle.oracle_type,
        &ctx.accounts.custody_oracle_account.to_account_info(),
        custody.oracle.max_price_error,
        custody.oracle.max_price_age_sec,
        curtime,
        false,
    )?;

    let token_ema_price = OraclePrice::new_from_oracle(
        custody.oracle.oracle_type,
        &ctx.accounts.custody_oracle_account.to_account_info(),
        custody.oracle.max_price_error,
        custody.oracle.max_price_age_sec,
        curtime,
        custody.pricing.use_ema,
    )?;

    let price = pool.get_exit_price(&token_price, &token_ema_price, position.side, custody)?;

    let size = token_ema_price.get_token_amount(position.size_usd, custody.decimals)?;

    let fee = pool.get_exit_fee(size, custody)?;

    Ok(PriceAndFee { price, fee })
}