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use thiserror::Error;
use cosmwasm_std::{StdError, Storage};
use cw_storage_plus::Item;
#[derive(Error, Debug, PartialEq)]
pub enum PreauthError {
#[error("{0}")]
Std(#[from] StdError),
#[error("No preauthorization available to add hook")]
NoPreauth {},
}
pub struct Preauth<'a>(Item<'a, u64>);
impl<'a> Preauth<'a> {
pub const fn new(preauth_key: &'a str) -> Self {
Preauth(Item::new(preauth_key))
}
pub fn set_auth(&self, storage: &mut dyn Storage, count: u64) -> Result<(), StdError> {
self.0.save(storage, &count)
}
pub fn get_auth(&self, storage: &dyn Storage) -> Result<u64, StdError> {
Ok(self.0.may_load(storage)?.unwrap_or_default())
}
pub fn add_auth(&self, storage: &mut dyn Storage) -> Result<(), StdError> {
let count = self.get_auth(storage)?;
self.set_auth(storage, count + 1)
}
pub fn use_auth(&self, storage: &mut dyn Storage) -> Result<(), PreauthError> {
let count = self.get_auth(storage)?;
let count = count.checked_sub(1).ok_or(PreauthError::NoPreauth {})?;
Ok(self.set_auth(storage, count)?)
}
}
#[cfg(test)]
mod test {
use super::*;
use cosmwasm_std::testing::MockStorage;
const PREAUTH: Preauth = Preauth::new("preauth");
#[test]
fn count_preauth() {
let mut storage = MockStorage::new();
assert_eq!(PREAUTH.get_auth(&storage).unwrap(), 0);
let err = PREAUTH.use_auth(&mut storage).unwrap_err();
assert_eq!(err, PreauthError::NoPreauth {});
PREAUTH.add_auth(&mut storage).unwrap();
assert_eq!(PREAUTH.get_auth(&storage).unwrap(), 1);
PREAUTH.use_auth(&mut storage).unwrap();
assert_eq!(PREAUTH.get_auth(&storage).unwrap(), 0);
let err = PREAUTH.use_auth(&mut storage).unwrap_err();
assert_eq!(err, PreauthError::NoPreauth {});
PREAUTH.set_auth(&mut storage, 27).unwrap();
assert_eq!(PREAUTH.get_auth(&storage).unwrap(), 27);
PREAUTH.use_auth(&mut storage).unwrap();
assert_eq!(PREAUTH.get_auth(&storage).unwrap(), 26);
}
}