smelter_utils/
lib.rs

1pub mod loaders;
2#[cfg(feature = "spl")]
3pub mod spl;
4
5use solana_program::{
6    account_info::AccountInfo, entrypoint::ProgramResult, program_error::ProgramError,
7    pubkey::Pubkey, rent::Rent, sysvar::Sysvar,
8};
9
10/// Creates a new pda.
11#[inline(always)]
12pub fn create_pda<'a, 'info>(
13    target_account: &'a AccountInfo<'info>,
14    owner: &Pubkey,
15    space: usize,
16    pda_seeds: &[&[u8]],
17    system_program: &'a AccountInfo<'info>,
18    payer: &'a AccountInfo<'info>,
19) -> ProgramResult {
20    let rent = Rent::get()?;
21    if target_account.lamports().eq(&0) {
22        // If balance is zero, create account
23        solana_program::program::invoke_signed(
24            &solana_program::system_instruction::create_account(
25                payer.key,
26                target_account.key,
27                rent.minimum_balance(space),
28                space as u64,
29                owner,
30            ),
31            &[
32                payer.clone(),
33                target_account.clone(),
34                system_program.clone(),
35            ],
36            &[pda_seeds],
37        )?;
38    } else {
39        // Otherwise, if balance is nonzero:
40
41        // 1) transfer sufficient lamports for rent exemption
42        let rent_exempt_balance = rent
43            .minimum_balance(space)
44            .saturating_sub(target_account.lamports());
45        if rent_exempt_balance.gt(&0) {
46            solana_program::program::invoke(
47                &solana_program::system_instruction::transfer(
48                    payer.key,
49                    target_account.key,
50                    rent_exempt_balance,
51                ),
52                &[
53                    payer.clone(),
54                    target_account.clone(),
55                    system_program.clone(),
56                ],
57            )?;
58        }
59
60        // 2) allocate space for the account
61        solana_program::program::invoke_signed(
62            &solana_program::system_instruction::allocate(target_account.key, space as u64),
63            &[target_account.clone(), system_program.clone()],
64            &[pda_seeds],
65        )?;
66
67        // 3) assign our program as the owner
68        solana_program::program::invoke_signed(
69            &solana_program::system_instruction::assign(target_account.key, owner),
70            &[target_account.clone(), system_program.clone()],
71            &[pda_seeds],
72        )?;
73    }
74
75    Ok(())
76}
77
78pub trait Discriminator {
79    fn discriminator() -> u8;
80}
81
82pub trait AccountDeserialize {
83    fn try_from_bytes(data: &[u8]) -> Result<&Self, ProgramError>;
84    fn try_from_bytes_mut(data: &mut [u8]) -> Result<&mut Self, ProgramError>;
85}
86
87#[macro_export]
88macro_rules! impl_to_bytes {
89    ($struct_name:ident) => {
90        impl $struct_name {
91            pub fn to_bytes(&self) -> &[u8] {
92                bytemuck::bytes_of(self)
93            }
94        }
95    };
96}
97
98#[macro_export]
99macro_rules! impl_account_from_bytes {
100    ($struct_name:ident) => {
101        impl crate::utils::AccountDeserialize for $struct_name {
102            fn try_from_bytes(
103                data: &[u8],
104            ) -> Result<&Self, solana_program::program_error::ProgramError> {
105                if Self::discriminator().ne(&data[0]) {
106                    return Err(solana_program::program_error::ProgramError::InvalidAccountData);
107                }
108                bytemuck::try_from_bytes::<Self>(&data[8..]).or(Err(
109                    solana_program::program_error::ProgramError::InvalidAccountData,
110                ))
111            }
112            fn try_from_bytes_mut(
113                data: &mut [u8],
114            ) -> Result<&mut Self, solana_program::program_error::ProgramError> {
115                if Self::discriminator().ne(&data[0]) {
116                    return Err(solana_program::program_error::ProgramError::InvalidAccountData);
117                }
118                bytemuck::try_from_bytes_mut::<Self>(&mut data[8..]).or(Err(
119                    solana_program::program_error::ProgramError::InvalidAccountData,
120                ))
121            }
122        }
123    };
124}
125
126#[macro_export]
127macro_rules! impl_instruction_from_bytes {
128    ($struct_name:ident) => {
129        impl $struct_name {
130            pub fn try_from_bytes(
131                data: &[u8],
132            ) -> Result<&Self, solana_program::program_error::ProgramError> {
133                bytemuck::try_from_bytes::<Self>(data).or(Err(
134                    solana_program::program_error::ProgramError::InvalidInstructionData,
135                ))
136            }
137        }
138    };
139}
smelter_utils/lib.rs

smelter_utils/
lib.rs
