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Avoid allocations on VariableList (#1921)

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## Issue Addressed

NA

## Proposed Changes

Avoids lots of grow allocations when decoding a `VariableList` of fixed-length items. This is the function used for decoding the `state.validators` list.

## Additional Info

NA
This commit is contained in:
Paul Hauner 2020-11-17 04:28:40 +00:00
parent 398919b5d4
commit 5114aee5cf
1 changed files with 4 additions and 2 deletions
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6
consensus/ssz_types/src/variable_list.rs
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@ -247,8 +247,10 @@ where
bytes
.chunks(T::ssz_fixed_len())
.map(|chunk| T::from_ssz_bytes(chunk))
.collect::<Result<Vec<_>, _>>()
.try_fold(Vec::with_capacity(num_items), |mut vec, chunk| {
vec.push(T::from_ssz_bytes(chunk)?);
Ok(vec)
})
.map(Into::into)
} else {
ssz::decode_list_of_variable_length_items(bytes, Some(max_len)).map(|vec| vec.into())