mango-v4/programs/mango-v4/src/state/mango_group.rs

use anchor_lang::prelude::*;
use fixed::types::I80F48;

pub use group_seeds;

use crate::error::*;

const MAX_TOKENS: usize = 60;
// TODO: Assuming we allow up to 65536 different tokens
pub type TokenIndex = u16;

#[zero_copy] // is repr(packed) still a problem
pub struct TokenInfo {
    pub mint: Pubkey,
    pub decimals: u8,
    pub bank_bump: u8,
    pub vault_bump: u8,

    // TODO: store oracle index here?
    pub reserved: [u8; 30], // TODO: size?
                            // token's bank account is a PDA
}
// TODO: static assert the size and alignment

impl TokenInfo {
    pub fn is_valid(&self) -> bool {
        self.mint != Pubkey::default()
    }
}

#[zero_copy]
pub struct Tokens {
    // TODO: If TokenInfo is 70 bytes, we can have < 142 tokens max due to the 10kb limit
    // We could make large accounts not be PDAs, hope for resize(), or store tokeninfo itself in a pda?
    pub infos: [TokenInfo; MAX_TOKENS],
}

impl Tokens {
    pub fn info_for_mint<'a>(&'a self, mint: &Pubkey) -> Result<&'a TokenInfo> {
        Ok(&self.infos[self.index_for_mint(mint)?])
    }

    pub fn index_for_mint(&self, mint: &Pubkey) -> Result<usize> {
        self.infos
            .iter()
            .position(|ti| ti.mint == *mint)
            .ok_or(error!(MangoError::SomeError)) // TODO: no such token err
    }
}

// TODO: Should we call this `Group` instead of `MangoGroup`? And `Account` instead of `MangoAccount`?
#[account(zero_copy)]
pub struct MangoGroup {
    // Relying on Anchor's discriminator be sufficient for our versioning needs?
    // pub meta_data: MetaData,
    pub admin: Pubkey,

    //pub num_oracles: usize, // incremented every time add_oracle is called
    //pub oracles: [Pubkey; MAX_PAIRS],
    pub tokens: Tokens,
    //pub spot_markets: [SpotMarketInfo; MAX_PAIRS],
    //pub perp_markets: [PerpMarketInfo; MAX_PAIRS],

    //pub signer_nonce: u64,
    //pub signer_key: Pubkey,
    // todo: which more dex'es do we want to support? orca for pure swap?
    //pub dex_program_id: Pubkey,

    //pub cache_valid_interval: u64,

    // todo: do we need this limit? afaik this was for ts liquidator to keep on working, maybe
    // with liquidatable-accounts-feed we have some sort of scaling? maybe we bought
    // some more breathing space?
    //pub max_mango_accounts: u32, // limits maximum number of MangoAccounts.v1 (closeable) accounts
    //pub num_mango_accounts: u32, // number of MangoAccounts.v1

    //pub ref_surcharge_centibps: u32, // 100
    //pub ref_share_centibps: u32,     // 80 (must be less than surcharge)
    //pub ref_mngo_required: u64,
    pub bump: u8,
}
// TODO: static assert the size and alignment

#[macro_export]
macro_rules! group_seeds {
    ( $group:expr ) => {
        &[b"group".as_ref(), $group.admin.as_ref(), &[$group.bump]]
    };
}