pinocchio-system 0.6.0

Pinocchio helpers to invoke System program instructions
Documentation 
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use pinocchio::{
    cpi::{invoke_signed, Signer},
    instruction::{InstructionAccount, InstructionView},
    AccountView, ProgramResult,
};

/// Transfer lamports.
///
/// ### Accounts:
///   0. `[WRITE, SIGNER]` Funding account
///   1. `[WRITE]` Recipient account
pub struct Transfer<'a> {
    /// Funding account.
    pub from: &'a AccountView,

    /// Recipient account.
    pub to: &'a AccountView,

    /// Amount of lamports to transfer.
    pub lamports: u64,
}

impl Transfer<'_> {
    #[inline(always)]
    pub fn invoke(&self) -> ProgramResult {
        self.invoke_signed(&[])
    }

    #[inline(always)]
    pub fn invoke_signed(&self, signers: &[Signer]) -> ProgramResult {
        // Instruction accounts
        let instruction_accounts: [InstructionAccount; 2] = [
            InstructionAccount::writable_signer(self.from.address()),
            InstructionAccount::writable(self.to.address()),
        ];

        // instruction data
        // - [0..4 ]: instruction discriminator
        // - [4..12]: lamports amount
        let mut instruction_data = [0; 12];
        instruction_data[0] = 2;
        instruction_data[4..12].copy_from_slice(&self.lamports.to_le_bytes());

        let instruction = InstructionView {
            program_id: &crate::ID,
            accounts: &instruction_accounts,
            data: &instruction_data,
        };

        invoke_signed(&instruction, &[self.from, self.to], signers)
    }
}