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feat(kafka): Add iterator for message headers #577

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Merged
lvthanh03 merged 1 commit into from
Oct 1, 2026
Merged

feat(kafka): Add iterator for message headers #577

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22 changes: 22 additions & 0 deletions rust-arroyo/src/backends/kafka/types.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,11 @@ impl Headers {
.find(|header| header.key == key)
.and_then(|header| header.value)
}

/// Iterate in Kafka order, including duplicate keys and headers without values.
pub fn iter(&self) -> impl Iterator<Item = Header<'_, &'_ [u8]>> + '_ {
self.headers.iter()
}
}

impl Default for Headers {
Expand Down Expand Up @@ -197,5 +202,22 @@ mod tests {
assert_eq!(headers.get("key1"), Some(b"value1").map(|v| v.as_ref()));
assert_eq!(headers.get("key2"), Some(b"value2").map(|v| v.as_ref()));
assert_eq!(headers.get("key10"), None);

let headers = headers.insert("key1", Some(b"again".to_vec()));
let headers = headers.insert("empty", None);
let entries: Vec<_> = headers
.iter()
.map(|header| (header.key, header.value))
.collect();
assert_eq!(
entries,
[
("key1", Some(b"value1".as_slice())),
("key2", Some(b"value2".as_slice())),
("key3", Some(b"value3".as_slice())),
("key1", Some(b"again".as_slice())),
("empty", None),
]
);
}
}
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