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
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164

use crate::{account::KeyedAccount, instruction::InstructionError, pubkey::Pubkey};
use num_traits::{FromPrimitive, ToPrimitive};

// Native program ENTRYPOINT prototype
pub type Entrypoint = unsafe extern "C" fn(
    program_id: &Pubkey,
    keyed_accounts: &mut [KeyedAccount],
    data: &[u8],
) -> Result<(), InstructionError>;

/// Convenience macro to declare a native program
///
/// bs58_string: bs58 string representation the program's id
/// name: Name of the program, must match the library name in Cargo.toml
/// entrypoint: Program's entrypoint, must be of `type Entrypoint`
///
/// # Examples
///
/// ```
/// use std::str::FromStr;
/// # // wrapper is used so that the macro invocation occurs in the item position
/// # // rather than in the statement position which isn't allowed.
/// # mod item_wrapper {
/// use solana_sdk::account::KeyedAccount;
/// use solana_sdk::instruction::InstructionError;
/// use solana_sdk::pubkey::Pubkey;
/// use solana_sdk::declare_program;
///
/// fn my_process_instruction(
///     program_id: &Pubkey,
///     keyed_accounts: &mut [KeyedAccount],
///     data: &[u8],
/// ) -> Result<(), InstructionError> {
///   // Process an instruction
///   Ok(())
/// }
///
/// declare_program!(
///     "My11111111111111111111111111111111111111111",
///     solana_my_program,
///     my_process_instruction
/// );
///
/// # }
/// # use solana_sdk::pubkey::Pubkey;
/// # use item_wrapper::id;
/// let my_id = Pubkey::from_str("My11111111111111111111111111111111111111111").unwrap();
/// assert_eq!(id(), my_id);
/// ```
/// ```
/// use std::str::FromStr;
/// # // wrapper is used so that the macro invocation occurs in the item position
/// # // rather than in the statement position which isn't allowed.
/// # mod item_wrapper {
/// use solana_sdk::account::KeyedAccount;
/// use solana_sdk::instruction::InstructionError;
/// use solana_sdk::pubkey::Pubkey;
/// use solana_sdk::declare_program;
///
/// fn my_process_instruction(
///     program_id: &Pubkey,
///     keyed_accounts: &mut [KeyedAccount],
///     data: &[u8],
/// ) -> Result<(), InstructionError> {
///   // Process an instruction
///   Ok(())
/// }
///
/// declare_program!(
///     solana_sdk::system_program::ID,
///     solana_my_program,
///     my_process_instruction
/// );
/// # }
///
/// # use item_wrapper::id;
/// assert_eq!(id(), solana_sdk::system_program::ID);
/// ```
#[macro_export]
macro_rules! declare_program(
    ($bs58_string:expr, $name:ident, $entrypoint:expr) => (
        $crate::declare_id!($bs58_string);

        #[macro_export]
        macro_rules! $name {
            () => {
                (stringify!($name).to_string(), $crate::id())
            };
        }

        #[no_mangle]
        pub extern "C" fn $name(
            program_id: &$crate::pubkey::Pubkey,
            keyed_accounts: &mut [$crate::account::KeyedAccount],
            data: &[u8],
        ) -> Result<(), $crate::instruction::InstructionError> {
            $entrypoint(program_id, keyed_accounts, data)
        }
    )
);

impl<T> From<T> for InstructionError
where
    T: ToPrimitive,
{
    fn from(error: T) -> Self {
        InstructionError::CustomError(error.to_u32().unwrap_or(0xbad_c0de))
    }
}

/// Return the next KeyedAccount or a NotEnoughAccountKeys instruction error
pub fn next_keyed_account<I: Iterator>(iter: &mut I) -> Result<I::Item, InstructionError> {
    iter.next().ok_or(InstructionError::NotEnoughAccountKeys)
}

pub fn limited_deserialize<T>(data: &[u8]) -> Result<T, InstructionError>
where
    T: serde::de::DeserializeOwned,
{
    #[cfg(not(feature = "program"))]
    let limit = crate::packet::PACKET_DATA_SIZE as u64;
    #[cfg(feature = "program")]
    let limit = 1024;
    bincode::config()
        .limit(limit)
        .deserialize(data)
        .map_err(|_| InstructionError::InvalidInstructionData)
}

pub trait DecodeError<E> {
    fn decode_custom_error_to_enum(custom: u32) -> Option<E>
    where
        E: FromPrimitive,
    {
        E::from_u32(custom)
    }
    fn type_of() -> &'static str;
}

#[cfg(test)]
mod tests {
    use super::*;
    use num_derive::FromPrimitive;

    #[test]
    fn test_decode_custom_error_to_enum() {
        #[derive(Debug, FromPrimitive, PartialEq)]
        enum TestEnum {
            A,
            B,
            C,
        }
        impl<T> DecodeError<T> for TestEnum {
            fn type_of() -> &'static str {
                "TestEnum"
            }
        }
        assert_eq!(TestEnum::decode_custom_error_to_enum(0), Some(TestEnum::A));
        assert_eq!(TestEnum::decode_custom_error_to_enum(1), Some(TestEnum::B));
        assert_eq!(TestEnum::decode_custom_error_to_enum(2), Some(TestEnum::C));
        let option: Option<TestEnum> = TestEnum::decode_custom_error_to_enum(3);
        assert_eq!(option, None);
    }
}