Rust Example

pub enum ProgramInstruction {
    InitializeCounter,
    IncreaseCounter {
        increase_by: u64
    },
    Delegate,
    CommitAndUndelegate,
    Commit,
    Undelegate {
        pda_seeds: Vec<Vec<u8>>
    }
}

#[derive(BorshDeserialize)]
struct IncreaseCounterPayload {
    increase_by: u64,
}

impl ProgramInstruction {
    pub fn unpack(input: &[u8]) -> Result<Self, ProgramError> {
        // Ensure the input has at least 8 bytes for the variant
        if input.len() < 8 {
            return Err(ProgramError::InvalidInstructionData);
        }

        // Extract the first 8 bytes as variant
        let (variant_bytes, rest) = input.split_at(8);
        let mut variant = [0u8; 8];
        variant.copy_from_slice(variant_bytes);

        Ok(match variant {
            [0, 0, 0, 0, 0, 0, 0, 0] => Self::InitializeCounter,
            [1, 0, 0, 0, 0, 0, 0, 0] => {
                let payload = IncreaseCounterPayload::try_from_slice(rest)?;
                Self::IncreaseCounter {
                    increase_by: payload.increase_by,
                }
            },
            [2, 0, 0, 0, 0, 0, 0, 0] => Self::Delegate,
            [3, 0, 0, 0, 0, 0, 0, 0] => Self::CommitAndUndelegate,
            [4, 0, 0, 0, 0, 0, 0, 0] => Self::Commit,
            [196, 28, 41, 206, 48, 37, 51, 167] => {
                let pda_seeds: Vec<Vec<u8>> = Vec::<Vec<u8>>::try_from_slice(rest)?;
                Self::Undelegate {
                    pda_seeds
                }
            }
            _ => return Err(ProgramError::InvalidInstructionData),
        })
    }
}

use solana_program::{
    account_info::{next_account_info, AccountInfo},
    pubkey::Pubkey,
    entrypoint::ProgramResult,
    program_error::ProgramError,
};
use ephemeral_rollups_sdk::cpi::{delegate_account, DelegateAccounts, DelegateConfig};

// For Base Layer only
pub fn process_delegate(
\_program_id: &Pubkey,
accounts: &[AccountInfo],
) -> ProgramResult {

    // Get accounts
    let account_info_iter = &mut accounts.iter();
    let initializer = next_account_info(account_info_iter)?;
    let system_program = next_account_info(account_info_iter)?;
    let pda_to_delegate = next_account_info(account_info_iter)?;
    let owner_program = next_account_info(account_info_iter)?;
    let delegation_buffer = next_account_info(account_info_iter)?;
    let delegation_record = next_account_info(account_info_iter)?;
    let delegation_metadata = next_account_info(account_info_iter)?;
    let delegation_program = next_account_info(account_info_iter)?;

    // Prepare counter pda seeds
    let seed_1 = b"counter_account";
    let seed_2 = initializer.key.as_ref();
    let pda_seeds: &[&[u8]] = &[seed_1, seed_2];

    let delegate_accounts = DelegateAccounts {
        payer: initializer,
        pda: pda_to_delegate,
        owner_program,
        buffer: delegation_buffer,
        delegation_record,
        delegation_metadata,
        delegation_program,
        system_program,
    };

    let delegate_config = DelegateConfig {
        commit_frequency_ms: 30_000,
        validator: None,
    };

    delegate_account(delegate_accounts, pda_seeds, delegate_config)?;

    Ok(())

}

use solana_program::{
    account_info::{next_account_info, AccountInfo},
    pubkey::Pubkey,
    entrypoint::ProgramResult,
    program_error::ProgramError,
};
use ephemeral_rollups_sdk::ephem::{commit_accounts};

// For ER only
pub fn process_commit(
    _program_id: &Pubkey,
    accounts: &[AccountInfo],
) -> ProgramResult {
    // Get accounts
    let account_info_iter = &mut accounts.iter();
    let initializer = next_account_info(account_info_iter)?;
    let counter_account = next_account_info(account_info_iter)?;
    let magic_program = next_account_info(account_info_iter)?;
    let magic_context = next_account_info(account_info_iter)?;

    // Signer should be the same as the initializer
    if !initializer.is_signer {
        msg!("Initializer {} should be the signer", initializer.key);
        return Err(ProgramError::MissingRequiredSignature);
    }

    commit_accounts(
        initializer,
        vec![counter_account],
        magic_context,
        magic_program,
    )?;

    Ok(())
}

use solana_program::{
    account_info::{next_account_info, AccountInfo},
    pubkey::Pubkey,
    entrypoint::ProgramResult,
    program_error::ProgramError,
};
use ephemeral_rollups_sdk::cpi::{undelegate_account};
use ephemeral_rollups_sdk::ephem::{commit_and_undelegate_accounts, commit_accounts};

// For ER only
pub fn process_commit_and_undelegate(
\_program_id: &Pubkey,
accounts: &[AccountInfo],
) -> ProgramResult {
// Get accounts
let account_info_iter = &mut accounts.iter();
let initializer = next_account_info(account_info_iter)?;
let counter_account = next_account_info(account_info_iter)?;
let magic_program = next_account_info(account_info_iter)?;
let magic_context = next_account_info(account_info_iter)?;

    // Signer should be the same as the initializer
    if !initializer.is_signer {
        msg!("Initializer {} should be the signer", initializer.key);
        return Err(ProgramError::MissingRequiredSignature);
    }

    // Commit and undelegate counter_account on ER
    commit_and_undelegate_accounts(
        initializer,
        vec![counter_account],
        magic_context,
        magic_program,
    )?;

    Ok(())

}

// For Base Layer CPI callback
pub fn process_undelegate(
program_id: &Pubkey,
accounts: &[AccountInfo],
pda_seeds: Vec<Vec<u8>>
) -> ProgramResult {
// Get accounts
let account_info_iter = &mut accounts.iter();
let delegated_pda = next_account_info(account_info_iter)?;
let delegation_buffer = next_account_info(account_info_iter)?;
let initializer = next_account_info(account_info_iter)?;
let system_program = next_account_info(account_info_iter)?;

    // CPI on Solana
    undelegate_account(
        delegated_pda,
        program_id,
        delegation_buffer,
        initializer,
        system_program,
        pda_seeds,
    )?;

    Ok(())

}