Function validate_put_routing

nodedb-cluster/src/distributed_array/handler.rs:179–191

Validate that a PUT request is routed to the correct shard. Returns `Ok(())` when routing is correct or when `prefix_bits == 0` (which means the request predates Hilbert routing and skips validation). Returns `Err(ClusterError::WrongOwner)` when the coordinator used a stale routing table; the coordinator should refresh and retry.

(req: &ArrayShardPutReq, local_vshard_id: u32)

/// Returns `Err(ClusterError::WrongOwner)` when the coordinator used a stale
/// routing table; the coordinator should refresh and retry.
fn validate_put_routing(req: &ArrayShardPutReq, local_vshard_id: u32) -> Result<()> {
    if req.prefix_bits == 0 {
        return Ok(());
    }
    let expected = array_vshard_for_tile(req.representative_hilbert_prefix, req.prefix_bits)?;
    if expected != local_vshard_id {
        return Err(ClusterError::WrongOwner {
            vshard_id: local_vshard_id,
            expected_owner_node: None,
        });
    }
    Ok(())
}

/// Validate that a SLICE request is routed to the correct shard.
///