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Merge pull request #3648 from TheBlueMatt/2025-03-alt-type-confusion-check

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Don't enforce owned values be written in `legacy` TLV writing
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Matt Corallo 2025-03-05 23:26:46 +00:00 • committed by GitHub
commit f4a20fd23f
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1 changed files with 18 additions and 3 deletions
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21
lightning/src/util/ser_macros.rs
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@ -42,9 +42,24 @@ macro_rules! _encode_tlv {
field.write($stream)?;
}
};
($stream: expr, $optional_type: expr, $optional_field: expr, (legacy, $fieldty: ty, $write: expr) $(, $self: ident)?) => {
$crate::_encode_tlv!($stream, $optional_type, { let value: Option<$fieldty> = $write($($self)?); value }, option);
};
($stream: expr, $optional_type: expr, $optional_field: expr, (legacy, $fieldty: ty, $write: expr) $(, $self: ident)?) => { {
let value: Option<_> = $write($($self)?);
#[cfg(debug_assertions)]
{
// The value we write may be either an Option<$fieldty> or an Option<&$fieldty>.
// Either way, it should decode just fine as a $fieldty, so we check that here.
// This is useful in that it checks that we aren't accidentally writing, for example,
// Option<Option<$fieldty>>.
if let Some(v) = &value {
let encoded_value = v.encode();
let mut read_slice = &encoded_value[..];
let _: $fieldty = $crate::util::ser::Readable::read(&mut read_slice)
.expect("Failed to read written TLV, check types");
assert!(read_slice.is_empty(), "Reading written TLV was short, check types");
}
}
$crate::_encode_tlv!($stream, $optional_type, value, option);
} };
($stream: expr, $type: expr, $field: expr, optional_vec $(, $self: ident)?) => {
if !$field.is_empty() {
$crate::_encode_tlv!($stream, $type, $field, required_vec);