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RateLimitOnYield

zebra_network::peer_set::candidate_set::rate_limit

Struct RateLimitOnYield 

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pub struct RateLimitOnYield<S, Response> {
    inner: S,
    interval: Duration,
    charges: fn(&Response) -> bool,
    next_allowed: Arc<Mutex<Instant>>,
}
Expand description

A middleware that rate-limits the responses that yield a result, as decided by the charges predicate.

Every call is forwarded to the inner service immediately. If charges returns true for the response, this middleware reserves the earliest free pacing slot, waits until that slot’s time, and only then returns the response. Responses that don’t charge are returned immediately, without consuming any rate-limit budget.

Because slots are reserved atomically, concurrent yielding responses are returned at least interval apart, in slot reservation order.

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§inner: S

The inner service.

§interval: Duration

The minimum interval between yielding responses.

§charges: fn(&Response) -> bool

Returns true if a response yields a result, consuming rate-limit budget.

§next_allowed: Arc<Mutex<Instant>>

The next free pacing slot, shared between clones of this middleware.

Implementations§

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impl<S, Response> RateLimitOnYield<S, Response>

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pub fn new(inner: S, interval: Duration, charges: fn(&Response) -> bool) -> Self

Returns a new RateLimitOnYield wrapping inner, limiting the responses that charges to one per interval.

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impl<S: Clone, Response: Clone> Clone for RateLimitOnYield<S, Response>

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fn clone(&self) -> RateLimitOnYield<S, Response>

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more
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impl<S: Debug, Response: Debug> Debug for RateLimitOnYield<S, Response>

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

Formats the value using the given formatter. Read more
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impl<S, Request, Response> Service<Request> for RateLimitOnYield<S, Response>
where S: Service<Request, Response = Response>, S::Future: Send + 'static, S::Error: Send + 'static, Response: Send + 'static,

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type Response = Response

Responses given by the service.
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type Error = <S as Service<Request>>::Error

Errors produced by the service.
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type Future = Pin<Box<dyn Future<Output = Result<Response, <S as Service<Request>>::Error>> + Send>>

The future response value.
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fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>>

Returns Poll::Ready(Ok(())) when the service is able to process requests. Read more
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fn call(&mut self, request: Request) -> Self::Future

Process the request and return the response asynchronously. Read more

Auto Trait Implementations§

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impl<S, Response> Freeze for RateLimitOnYield<S, Response>
where S: Freeze, fn(&Response) -> bool: Freeze,

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impl<S, Response> RefUnwindSafe for RateLimitOnYield<S, Response>
where S: RefUnwindSafe, fn(&Response) -> bool: RefUnwindSafe,

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impl<S, Response> Send for RateLimitOnYield<S, Response>
where S: Send, fn(&Response) -> bool: Send,

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impl<S, Response> Sync for RateLimitOnYield<S, Response>
where S: Sync, fn(&Response) -> bool: Sync,

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impl<S, Response> Unpin for RateLimitOnYield<S, Response>
where S: Unpin, fn(&Response) -> bool: Unpin,

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impl<S, Response> UnsafeUnpin for RateLimitOnYield<S, Response>
where S: UnsafeUnpin, fn(&Response) -> bool: UnsafeUnpin,

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impl<S, Response> UnwindSafe for RateLimitOnYield<S, Response>
where S: UnwindSafe, fn(&Response) -> bool: UnwindSafe,

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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self> ⓘ
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a [WithDispatch] wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self> ⓘ

Attaches the current default Subscriber to this type, returning a [WithDispatch] wrapper. Read more
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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self> ⓘ
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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fn with_current_subscriber(self) -> WithDispatch<Self> ⓘ

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more

Layout§

Note: Unable to compute type layout, possibly due to this type having generic parameters. Layout can only be computed for concrete, fully-instantiated types.