Function extract_weight_from_properties

nodedb-graph/src/csr/weights.rs:186–211

Extract the `"weight"` property from MessagePack-encoded edge properties. Returns 1.0 if properties are empty, malformed, or don't contain a `"weight"` key. Handles F64, F32, and integer weight values; other numeric types default to 1.0.

(properties: &[u8])

/// `"weight"` key. Handles F64, F32, and integer weight values; other
/// numeric types default to 1.0.
pub fn extract_weight_from_properties(properties: &[u8]) -> f64 {
    if properties.is_empty() {
        return 1.0;
    }
    let Ok(val) = rmpv::decode::read_value(&mut &properties[..]) else {
        return 1.0;
    };
    match val {
        rmpv::Value::Map(entries) => {
            for (k, v) in entries {
                if let rmpv::Value::String(ref s) = k
                    && s.as_str() == Some("weight")
                {
                    return match v {
                        rmpv::Value::F64(f) => f,
                        rmpv::Value::F32(f) => f as f64,
                        rmpv::Value::Integer(i) => i.as_f64().unwrap_or(1.0),
                        _ => 1.0,
                    };
                }
            }
            1.0
        }
        _ => 1.0,
    }
}

#[cfg(test)]
mod tests {