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use crate::account::{Account, KeyedAccount};
use crate::instruction::InstructionError;
use crate::pubkey::Pubkey;
use bincode::ErrorKind;
pub const ENTRYPOINT: &str = "process";
pub type Entrypoint = unsafe extern "C" fn(
program_id: &Pubkey,
keyed_accounts: &mut [KeyedAccount],
data: &[u8],
tick_height: u64,
) -> Result<(), InstructionError>;
#[macro_export]
macro_rules! solana_entrypoint(
($entrypoint:ident) => (
#[no_mangle]
pub extern "C" fn process(
program_id: &solana_sdk::pubkey::Pubkey,
keyed_accounts: &mut [solana_sdk::account::KeyedAccount],
data: &[u8],
tick_height: u64
) -> Result<(), solana_sdk::instruction::InstructionError> {
$entrypoint(program_id, keyed_accounts, data, tick_height)
}
)
);
pub trait State<T> {
fn state(&self) -> Result<T, InstructionError>;
fn set_state(&mut self, state: &T) -> Result<(), InstructionError>;
}
impl<T> State<T> for Account
where
T: serde::Serialize + serde::de::DeserializeOwned,
{
fn state(&self) -> Result<T, InstructionError> {
self.deserialize_data()
.map_err(|_| InstructionError::InvalidAccountData)
}
fn set_state(&mut self, state: &T) -> Result<(), InstructionError> {
self.serialize_data(state).map_err(|err| match *err {
ErrorKind::SizeLimit => InstructionError::AccountDataTooSmall,
_ => InstructionError::GenericError,
})
}
}
impl<'a, T> State<T> for KeyedAccount<'a>
where
T: serde::Serialize + serde::de::DeserializeOwned,
{
fn state(&self) -> Result<T, InstructionError> {
self.account.state()
}
fn set_state(&mut self, state: &T) -> Result<(), InstructionError> {
self.account.set_state(state)
}
}