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Add ssz_fixed_len method to ssz::Encode

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This commit is contained in:
Paul Hauner
2019-09-08 12:23:37 -04:00
parent d8ce59e235
commit 6a870d468c
15 changed files with 191 additions and 102 deletions
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95
eth2/utils/ssz/src/macros.rs
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@@ -1,96 +1 @@
/// Implements `Encode` for `$impl_type` using an implementation of `From<$impl_type> for
/// $from_type`.
///
/// In effect, this allows for easy implementation of `Encode` for some type that implements a
/// `From` conversion into another type that already has `Encode` implemented.
#[macro_export]
macro_rules! impl_encode_via_from {
($impl_type: ty, $from_type: ty) => {
impl ssz::Encode for $impl_type {
fn is_ssz_fixed_len() -> bool {
<$from_type as ssz::Encode>::is_ssz_fixed_len()
}
fn ssz_fixed_len() -> usize {
<$from_type as ssz::Encode>::ssz_fixed_len()
}
fn ssz_append(&self, buf: &mut Vec<u8>) {
let conv: $from_type = self.clone().into();
conv.ssz_append(buf)
}
}
};
}
/// Implements `Decode` for `$impl_type` using an implementation of `From<$impl_type> for
/// $from_type`.
///
/// In effect, this allows for easy implementation of `Decode` for some type that implements a
/// `From` conversion into another type that already has `Decode` implemented.
#[macro_export]
macro_rules! impl_decode_via_from {
($impl_type: ty, $from_type: tt) => {
impl ssz::Decode for $impl_type {
fn is_ssz_fixed_len() -> bool {
<$from_type as ssz::Decode>::is_ssz_fixed_len()
}
fn ssz_fixed_len() -> usize {
<$from_type as ssz::Decode>::ssz_fixed_len()
}
fn from_ssz_bytes(bytes: &[u8]) -> Result<Self, ssz::DecodeError> {
$from_type::from_ssz_bytes(bytes).and_then(|dec| Ok(dec.into()))
}
}
};
}
#[cfg(test)]
mod tests {
use self::ssz::{Decode, Encode};
use crate as ssz;
#[derive(PartialEq, Debug, Clone, Copy)]
struct Wrapper(u64);
impl From<u64> for Wrapper {
fn from(x: u64) -> Wrapper {
Wrapper(x)
}
}
impl From<Wrapper> for u64 {
fn from(x: Wrapper) -> u64 {
x.0
}
}
impl_encode_via_from!(Wrapper, u64);
impl_decode_via_from!(Wrapper, u64);
#[test]
fn impl_encode_via_from() {
let check_encode = |a: u64, b: Wrapper| assert_eq!(a.as_ssz_bytes(), b.as_ssz_bytes());
check_encode(0, Wrapper(0));
check_encode(1, Wrapper(1));
check_encode(42, Wrapper(42));
}
#[test]
fn impl_decode_via_from() {
let check_decode = |bytes: Vec<u8>| {
let a = u64::from_ssz_bytes(&bytes).unwrap();
let b = Wrapper::from_ssz_bytes(&bytes).unwrap();
assert_eq!(a, b.into())
};
check_decode(vec![0, 0, 0, 0, 0, 0, 0, 0]);
check_decode(vec![1, 0, 0, 0, 0, 0, 0, 0]);
check_decode(vec![1, 0, 0, 0, 2, 0, 0, 0]);
}
}