Companion macro for programs using nitrate entrypoint. It creates structs to provide an easy way to access instruction accounts, while being more efficient than using solana_program::account_info::next_account_info iterator.

Getting started

The macro is part of nitrate crate:

cargo add nitrate

[!IMPORTANT] You need to use the custom entrypoint! defined on the crate in order to use the Accounts derive macro.

Example

Annotate your instruction enum with Accounts derive:

#[derive(BorshDeserialize, BorshSerialize, Clone, Debug, ShankInstruction, Accounts)]
pub struct Instruction {
    #[account(0, signer, writable, name="buffer", desc = "The unitialized buffer account")]
    #[account(1, writable, name="recipient", desc = "The account receiving refunded rent")]
    Close,

    #[account(0, writable, name="asset", desc = "Asset account")]
    #[account(1, signer, writable, name="signer", desc = "The owner or burn delegate of the asset")]
    #[account(2, optional, writable, name="recipient", desc = "The account receiving refunded rent")]
    #[account(3, optional, writable, name="group", desc = "Asset account of the group")]
    Burn,
}

This will create a module accounts with a struct for each variant (instruction) of the enum:

use nitrate::program::AccountInfo;

mod accounts {
    pub struct Close<'a> {
        pub buffer: &'a AccountInfo,
        pub recipient: &'a AccountInfo,
    }

    pub struct Burn<'a> {
        pub asset: &'a AccountInfo,
        pub signer: &'a AccountInfo,
        pub recipient: Option<&'a AccountInfo>,
        pub group: Option<&'a AccountInfo>,
    }
}

In your instruction processor, a Context can then be created to access the accounts of an instruction:

let ctx = Burn::context(accounts)?;
msg!("Burn asset: {:?}", ctx.accounts.asset.key());

License

Copyright (c) 2024 nifty-oss maintainers

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.