Function decode_document

nodedb/src/data/executor/doc_format.rs:24–44

Convert a document byte blob to `serde_json::Value`. Auto-detects the format: MessagePack, JSON, or Binary Tuple. Binary Tuple detection requires knowing the schema — if the bytes don't match MessagePack or JSON, returns `None` (the caller should use `strict_format::binary_tuple_to_json` with the schema if the collection is known to be strict).

(bytes: &[u8])

/// use `strict_format::binary_tuple_to_json` with the schema if the
/// collection is known to be strict).
pub(super) fn decode_document(bytes: &[u8]) -> Option<serde_json::Value> {
    if bytes.is_empty() {
        return None;
    }

    // Detect MessagePack: maps start with 0x80-0x8F (fixmap), 0xDE (map16), 0xDF (map32).
    let first = bytes[0];
    if (0x80..=0x8F).contains(&first) || first == 0xDE || first == 0xDF {
        // Try MessagePack first.
        if let Ok(val) = nodedb_types::json_from_msgpack(bytes) {
            return Some(val);
        }
    }

    // Fall back to JSON.
    sonic_rs::from_slice(bytes).ok()

    // Note: Binary Tuple bytes are NOT auto-detected here because decoding
    // requires the schema. For strict collections, callers must check
    // doc_configs.storage_mode and use strict_format::binary_tuple_to_json().
}

/// Convert a document byte blob to `nodedb_types::Value`.
///