Enum CloseReason 

#[non_exhaustive]
pub enum CloseReason {
    Graceful,
    PolicyDenied(Cow<'static, str>),
    ProtocolError(Cow<'static, str>),
    Cancelled,
}

Reason a connection closed. #[non_exhaustive] so new operator- visible reasons (e.g. quota-hit, rate-limit-trip) can be added without breaking downstream observers that pattern-match on the enum.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Graceful

PolicyDenied(Cow<'static, str>)

ProtocolError(Cow<'static, str>)

Cancelled

Daemon-initiated cancellation — listener force_cancel fired during shutdown drain (spec/topology.md § Listener lifecycle), or any other ctx.cancel.cancelled() propagation. Distinct from Graceful so management observers can distinguish “client EOF’d” from “daemon pulled the plug while in-flight.”

Trait Implementations

impl Clone for CloseReason

fn clone(&self) -> CloseReason

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CloseReason

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

Formats the value using the given formatter.