pinocchio-system 0.6.0

Pinocchio helpers to invoke System program instructions
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83

use pinocchio::{
    cpi::{invoke_signed, Signer},
    instruction::{InstructionAccount, InstructionView},
    AccountView, ProgramResult,
};

/// Withdraw funds from a nonce account.
///
/// The `u64` parameter is the lamports to withdraw, which must leave the
/// account balance above the rent exempt reserve or at zero.
///
/// ### Accounts:
///   0. `[WRITE]` Nonce account
///   1. `[WRITE]` Recipient account
///   2. `[]` Recent blockhashes sysvar
///   3. `[]` Rent sysvar
///   4. `[SIGNER]` Nonce authority
pub struct WithdrawNonceAccount<'a> {
    /// Nonce account.
    pub account: &'a AccountView,

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

    /// Recent blockhashes sysvar.
    pub recent_blockhashes_sysvar: &'a AccountView,

    /// Rent sysvar.
    pub rent_sysvar: &'a AccountView,

    /// Nonce authority.
    pub authority: &'a AccountView,

    /// Lamports to withdraw.
    ///
    /// The account balance must be left above the rent exempt reserve
    /// or at zero.
    pub lamports: u64,
}

impl WithdrawNonceAccount<'_> {
    #[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; 5] = [
            InstructionAccount::writable(self.account.address()),
            InstructionAccount::writable(self.recipient.address()),
            InstructionAccount::readonly(self.recent_blockhashes_sysvar.address()),
            InstructionAccount::readonly(self.rent_sysvar.address()),
            InstructionAccount::readonly_signer(self.authority.address()),
        ];

        // instruction data
        // - [0..4 ]: instruction discriminator
        // - [4..12]: lamports
        let mut instruction_data = [0; 12];
        instruction_data[0] = 5;
        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.account,
                self.recipient,
                self.recent_blockhashes_sysvar,
                self.rent_sysvar,
                self.authority,
            ],
            signers,
        )
    }
}