Building a Rust Program for Solana RBPF (Reserve-Based Proof of Function)

In this article, we will walk through the process of building and deploying a Rust program that can be integrated with Solana’s Proof of Function (RBPF) to create a decentralized application.

Getting Started

To begin, install the required dependencies for Solana and Rust. Run the following command in your terminal:

cargo new solana_hello --lib

This will create a new Rust library project called “solana_hello”. You can then build and run it with:

cargo build --release
cargo run --release

Creating a Hello World Program

The “hello.rs” file defines our program as a simple function that displays “Hello, World!” to the Solana blockchain. Let’s add some error handling and logging for fun.

use anchor_lang::prelude::*;
declare_id!("3bKgMxR7MwXLzGDfdsW8HsNYSSxRejf6uUF69Mmupfx7");
#[program]
ad mode hello {
use super::*;
pub fn hello() -> Result<(), AnchorError> {
let _ = ask!(get_state_query::state as Result, "account information" ?;
Ok(())
}
}

In this code, I added a simple “hello” function that retrieves the current account information using the “get_state_query” function. We also return a result from this function to indicate whether the operation was successful.

Required to Solana

To deploy our program to Solana, we will use Anchor CLI. Run the following command:

anchor node build --release --output path/to/deploy

This will create a deployment package in “path/to/deploy”. We can then upload this package to a Solana node using the command “anchor”.

Adding an entry for RBPF

To use our program in RBPF Solana, we need to add an input parameter. In this case, we will define a new input type called hello_input.

Add the following code to the “hello.rs” file:

use anchor_lang::prelude::*;
declare_id!("3bKgMxR7MwXLzGDfdsW8HsNYSSxRejf6uUF69Mmupfx7");
#[program]
ad mode hello {
use super::*;
pub fn hello(input::HelloInput) -> Result<(), AnchorError> {
let _ = ask!(get_state_query::state as Result, "account information" ?;
OK(())
}
}

The hello_input type represents a single input parameter. In this case, we expect a HelloInput structure with a single field called name.

Creating an RBPF Contract

To create an RBPF contract that uses our program as a callable function, we will define a new contract using the Anchor macro “contract”.

uses anchor_lang::prelude::*;
declare_id!("3bKgMxR7MwXLzGDfdsW8HsNYSSxRejf6uUF69Mmupfx7");
#[program]
ad mode hello {
use super::*;
ad fn hello(input::HelloInput) -> Result<(), AnchorError> {
let _ = ask!(get_state_query::state as Result, "account information" ?;
OK(())
}
}
contract MyRBPFContract {
user agreement::prelude::*;
use hello::*;
async fn main() -> Result<()> {
let account_id = get_account().wait ?;
let input = hello_input::HelloInput {
name: b"World".to_vec(),
};
let result = MyRBPFContract::invoke(input, &[]);
OK(())
}
}

In this code, I have defined a new contract called “MyRBPFContract”. The main function creates an account and initializes the input parameter using our hello_input type.

Build and Run

To build and run the RBPF contract, run the following commands:

cargo build --release
anchor node build --release --output path/to/deploy

This will create a new deployment package in “path/to/deploy”. You can then upload this package to a Solana node using the “anchor” command.