Enum Direction 

pub enum Direction {
    Inbound,
    Outbound,
}

Which side of the link a limiter guards — and therefore whether a REFUSED message is charged.

The two directions need opposite accounting, and the difference is the anti-flood ratchet:

• Direction::Inbound charges a refusal, because the peer already spent our bandwidth delivering the frame. A peer whose frames are being rejected keeps burning the budget, so the window stays exhausted and the flood cannot run for free.
• Direction::Outbound does not, because we chose not to send: a caller that backs off and retries must not be permanently penalised for having asked early.

This is an enum rather than upstream’s positional bool deliberately. A bare true in new(true, ..) reads as nothing at the call site and can be dropped by a signature change with no reviewer noticing — which is exactly how the inbound rule went missing here once already. Direction::Inbound is checkable at a glance.

Variants

Inbound

Frames received from a peer; a refusal IS charged.

Outbound

Messages we are about to send; a refusal is NOT charged.

Trait Implementations

impl Clone for Direction

fn clone(&self) -> Direction

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for Direction

impl Debug for Direction

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for Direction

impl PartialEq for Direction

fn eq(&self, other: &Direction) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Direction