AccessControl Enumerable

This example shows how you can reuse the implementation of AccessControl with AccessControlEnumerable extension, which enables an easier overview of access control roles.

First, you should implement basic version of AccessControl.

Step 1: Add implemenation of AccessControlEnumerable

#![cfg_attr(not(feature = "std"), no_std, no_main)]

#[openbrush::contract]
#[openbrush::implementation(AccessControl, AccessControlEnumerable)]
pub mod my_access_control {
    ...

Step 2: Define storage

#[ink(storage)]
#[derive(Default, Storage)]
pub struct Contract {
    #[storage_field]
    enumerable: enumerable::Data,
}

Final code

#![cfg_attr(not(feature = "std"), no_std, no_main)]

#[openbrush::implementation(AccessControl, AccessControlEnumerable)]
#[openbrush::contract]
pub mod my_access_control {
    use openbrush::traits::Storage;

    #[ink(storage)]
    #[derive(Default, Storage)]
    pub struct Contract {
        #[storage_field]
        enumerable: enumerable::Data,
    }

    // You can manually set the number for the role.
    // But better to use a hash of the variable name.
    // It will generate a unique identifier of this role.
    // And will reduce the chance to have overlapping roles.
    const MINTER: RoleType = ink::selector_id!("MINTER");

    impl Contract {
        #[ink(constructor)]
        pub fn new() -> Self {
            let mut instance = Self::default();

            let caller = Self::env().caller();
            access_control::Internal::_init_with_admin(&mut instance, Some(caller));
            // We grant minter role to caller in constructor, so he can mint/burn tokens
            AccessControl::grant_role(&mut instance, MINTER, Some(caller)).expect("Should grant MINTER role");
            assert_eq!(AccessControlEnumerable::get_role_member_count(&instance, MINTER), 1);

            instance
        }
    }
}

And that's it! Your AccessControl is now extended by the AccessControlEnumerable extension and ready to use its functions! You can check an example of the usage of AccessControl Enumerable.

You can also check the documentation for the basic implementation of AccessControl.