2020-02-04 14:54:49 -08:00
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use crate::{account::KeyedAccount, instruction::InstructionError};
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2020-01-30 09:47:22 -08:00
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use num_traits::FromPrimitive;
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2018-11-13 18:17:32 -08:00
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2019-10-10 05:30:42 -07:00
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/// Return the next KeyedAccount or a NotEnoughAccountKeys instruction error
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pub fn next_keyed_account<I: Iterator>(iter: &mut I) -> Result<I::Item, InstructionError> {
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iter.next().ok_or(InstructionError::NotEnoughAccountKeys)
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}
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2020-01-10 13:20:15 -08:00
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/// Return true if the first keyed_account is executable, used to determine if
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/// the loader should call a program's 'main'
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2020-01-22 09:11:56 -08:00
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pub fn is_executable(keyed_accounts: &[KeyedAccount]) -> Result<bool, InstructionError> {
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Ok(!keyed_accounts.is_empty() && keyed_accounts[0].executable()?)
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2020-01-10 13:20:15 -08:00
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}
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2020-01-20 15:27:36 -08:00
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pub fn limited_deserialize<T>(instruction_data: &[u8]) -> Result<T, InstructionError>
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2019-10-23 19:56:07 -07:00
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where
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T: serde::de::DeserializeOwned,
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{
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let limit = crate::packet::PACKET_DATA_SIZE as u64;
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bincode::config()
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.limit(limit)
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2020-01-20 15:27:36 -08:00
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.deserialize(instruction_data)
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2019-10-23 19:56:07 -07:00
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.map_err(|_| InstructionError::InvalidInstructionData)
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}
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2019-04-25 10:29:44 -07:00
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pub trait DecodeError<E> {
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2019-09-06 10:55:03 -07:00
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fn decode_custom_error_to_enum(custom: u32) -> Option<E>
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2019-04-25 10:29:44 -07:00
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where
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E: FromPrimitive,
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{
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2019-09-06 10:55:03 -07:00
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E::from_u32(custom)
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2019-04-25 10:29:44 -07:00
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}
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2019-09-06 10:55:03 -07:00
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fn type_of() -> &'static str;
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2019-04-25 10:29:44 -07:00
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use num_derive::FromPrimitive;
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#[test]
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fn test_decode_custom_error_to_enum() {
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#[derive(Debug, FromPrimitive, PartialEq)]
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enum TestEnum {
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A,
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B,
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C,
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}
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impl<T> DecodeError<T> for TestEnum {
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2019-09-06 10:55:03 -07:00
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fn type_of() -> &'static str {
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2019-04-25 10:29:44 -07:00
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"TestEnum"
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}
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}
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assert_eq!(TestEnum::decode_custom_error_to_enum(0), Some(TestEnum::A));
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assert_eq!(TestEnum::decode_custom_error_to_enum(1), Some(TestEnum::B));
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assert_eq!(TestEnum::decode_custom_error_to_enum(2), Some(TestEnum::C));
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let option: Option<TestEnum> = TestEnum::decode_custom_error_to_enum(3);
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assert_eq!(option, None);
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}
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}
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