Struct JitterDelayLayer 

pub struct JitterDelayLayer { /* private fields */ }

Available on crate feature tower-delay only.

A Tower Layer that introduces a jittered delay before each request.

The actual delay for each request will be randomly chosen within the range [base - base*pct, base + base*pct].

Example

use std::time::Duration;
use wreq::Client;
use wreq_util::middleware::delay::JitterDelayLayer;

// Creates delays in range [0.8s, 1.2s] (1s ± 20%)
let client = Client::builder()
    .layer(JitterDelayLayer::new(Duration::from_secs(1), 0.2))
    .build()?;

Implementations

impl JitterDelayLayer

pub fn new(base: Duration, pct: f64) -> Self

Create a new JitterDelayLayer with the given base delay and jitter percentage.

Arguments

• base - The base delay duration
• pct - The jitter percentage (0.0 to 1.0), representing ±pct deviation

Example

use std::time::Duration;
use wreq_util::middleware::delay::JitterDelayLayer;

// Creates delays in range [800ms, 1200ms]
let layer = JitterDelayLayer::new(Duration::from_secs(1), 0.2);

pub fn when<P, Req>(self, predicate: P) -> JitterDelayLayerWith<P>

where P: Fn(&Req) -> bool + Clone,

Apply jitter delay only to requests that satisfy a predicate.

Requests that don’t match the predicate will pass through without delay.

Example

use std::time::Duration;
use http::Request;
use wreq_util::middleware::delay::JitterDelayLayer;

// Only delay requests to paths starting with "/slow"
let layer = JitterDelayLayer::new(Duration::from_secs(1), 0.2)
    .when(|req: &Request<_>| req.uri().path().starts_with("/slow"));

Trait Implementations

impl Clone for JitterDelayLayer

fn clone(&self) -> JitterDelayLayer

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for JitterDelayLayer

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

Formats the value using the given formatter.

impl<S> Layer<S> for JitterDelayLayer

type Service = JitterDelay<S>

The wrapped service

fn layer(&self, inner: S) -> Self::Service

Wrap the given service with the middleware, returning a new service that has been decorated with the middleware.