cardinal-use-invalidator 0.0.6

Cardinal usage invalidator and counter
Documentation 
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use {
    crate::{state::*, errors::*},
    anchor_lang::{prelude::*},
    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.max_usages == None || use_invalidator.usages + num_usages <= use_invalidator.max_usages.unwrap() @ ErrorCode::InsufficientUsages)]
    use_invalidator: Box<Account<'info, UseInvalidator>>,

    // TODO maybe add use authority to this state
    // #[account(constraint = user.key() == token_manager.recipient_token_account.owner)]
    user: Signer<'info>,
}

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