Method to_bytes

nodedb-vector/src/rerank/sidecar.rs:59–85

Serialize the sidecar (codec state + all encoded vectors) to bytes. Format: `[NDCC (4 bytes)][version: u8 = 1][msgpack payload]`

(&self)

    ///
    /// Format: `[NDCC (4 bytes)][version: u8 = 1][msgpack payload]`
    pub fn to_bytes(&self) -> Result<Vec<u8>, RerankError> {
        let codec_bytes = self.codec.to_bytes()?;
        let codec_name_byte = codec_name_to_u8(self.codec.name());

        #[derive(
            serde::Serialize, serde::Deserialize, zerompk::ToMessagePack, zerompk::FromMessagePack,
        )]
        struct Payload {
            codec_name: u8,
            codec_bytes: Vec<u8>,
            encoded: Vec<(u32, Vec<u8>)>,
        }

        let payload = Payload {
            codec_name: codec_name_byte,
            codec_bytes,
            encoded: self.encoded.iter().map(|(k, v)| (*k, v.clone())).collect(),
        };

        let body = zerompk::to_msgpack_vec(&payload)
            .map_err(|e| RerankError::BadInput(format!("sidecar serialize: {e}")))?;
        let mut buf = Vec::with_capacity(5 + body.len());
        buf.extend_from_slice(&SIDECAR_MAGIC);
        buf.push(SIDECAR_VERSION);
        buf.extend_from_slice(&body);
        Ok(buf)
    }

    /// Deserialize a sidecar from bytes produced by [`Self::to_bytes`].
    pub fn from_bytes(bytes: &[u8]) -> Result<Self, RerankError> {