cardinal-use-invalidator 1.0.3

Cardinal usage invalidator and counter
Documentation 
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use {
    crate::{errors::ErrorCode, state::*},
    anchor_lang::prelude::*,
    anchor_spl::token::TokenAccount,
    cardinal_token_manager::state::TokenManager,
};

#[derive(Accounts)]
#[instruction(num_usages: u64)]
pub struct IncrementUsagesCtx<'info> {
    token_manager: Box<Account<'info, TokenManager>>,

    #[account(mut, constraint = use_invalidator.total_usages == None || use_invalidator.usages.checked_add(num_usages).unwrap() <= use_invalidator.total_usages.unwrap() @ ErrorCode::InsufficientUsages)]
    use_invalidator: Box<Account<'info, UseInvalidator>>,

    #[account(constraint = token_manager.recipient_token_account == recipient_token_account.key() @ ErrorCode::InvalidTokenAccount)]
    recipient_token_account: Box<Account<'info, TokenAccount>>,
    #[account(constraint = user.key() == recipient_token_account.owner @ ErrorCode::InvalidUser)]
    user: Signer<'info>,
}

pub fn handler(ctx: Context<IncrementUsagesCtx>, num_usages: u64) -> Result<()> {
    let use_invalidator = &mut ctx.accounts.use_invalidator;
    use_invalidator.usages = use_invalidator.usages.checked_add(num_usages).unwrap();
    Ok(())
}