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use crate::{declare_sysvar_id, hash::Hash, sysvar::Sysvar}; use serde::{ de::{SeqAccess, Visitor}, ser::SerializeTuple, Deserializer, Serializer, }; use std::fmt; use std::marker::PhantomData; pub const MAX_ENTRIES: usize = 256; declare_sysvar_id!( "SysvarRecentEVMB1ockHashes11111111111111111", RecentBlockhashes ); #[repr(C)] #[derive(Serialize, Deserialize, Clone, Debug, PartialEq)] pub struct RecentBlockhashes(#[serde(with = "RecentBlockhashes")] pub [Hash; MAX_ENTRIES]); impl Default for RecentBlockhashes { fn default() -> Self { Self([Hash::new_from_array([0; 32]); MAX_ENTRIES]) } } impl RecentBlockhashes { fn deserialize<'de, D>(deserializer: D) -> Result<[Hash; MAX_ENTRIES], D::Error> where D: Deserializer<'de>, { struct ArrayVisitor<T> { element: PhantomData<T>, } use serde::de::Deserialize; impl<'de, T> Visitor<'de> for ArrayVisitor<T> where T: Default + Copy + Deserialize<'de>, { type Value = [T; MAX_ENTRIES]; fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { formatter.write_str(concat!("an array of length ", 256)) } fn visit_seq<A>(self, mut seq: A) -> Result<[T; MAX_ENTRIES], A::Error> where A: SeqAccess<'de>, { let mut arr = [T::default(); MAX_ENTRIES]; for (i, item) in arr.iter_mut().enumerate() { *item = seq .next_element()? .ok_or_else(|| serde::de::Error::invalid_length(i, &self))?; } Ok(arr) } } let visitor = ArrayVisitor { element: PhantomData, }; deserializer.deserialize_tuple(MAX_ENTRIES, visitor) } fn serialize<S>(data: &[Hash; MAX_ENTRIES], serializer: S) -> Result<S::Ok, S::Error> where S: Serializer, { let mut seq = serializer.serialize_tuple(data.len())?; for elem in &data[..] { seq.serialize_element(elem)?; } seq.end() } } impl Sysvar for RecentBlockhashes { fn size_of() -> usize { MAX_ENTRIES * 32 } } #[cfg(test)] mod test { use super::*; #[test] fn test_seriazize_evm_blockhashes() { let blockhashes = RecentBlockhashes::default(); assert_eq!( bincode::serialize(&blockhashes).unwrap().len(), MAX_ENTRIES * 32 ) } }