Enum CircuitState 

pub enum CircuitState {
    Closed,
    Open,
    HalfOpen,
}

Circuit breaker state machine.

Prevents routing to a failing provider by tracking consecutive failures:

• Closed: Normal operation. Failures increment a counter.
• Open: Too many failures. All requests are rejected until cooldown expires.
• HalfOpen: Cooldown expired. One probe request is allowed through. Success -> Closed. Failure -> Open (reset cooldown).

Variants

Closed

Normal operation – requests pass through.

Open

Circuit tripped – requests are rejected.

HalfOpen

Cooldown expired – one probe request allowed.

Trait Implementations

impl Clone for CircuitState

fn clone(&self) -> CircuitState

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for CircuitState

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

Formats the value using the given formatter.

impl Display for CircuitState

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

Formats the value using the given formatter.

impl PartialEq for CircuitState

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for CircuitState

impl Eq for CircuitState

impl StructuralPartialEq for CircuitState