Crate gcr 

A fast, simple, and small Generic Cell Rate (Gcr) algorithm implementation with zero dependencies that allows for dynamic rate adjustment.

Usage

use gcr::Gcr;
use std::time::Duration;

let mut rate = Gcr::new(10, Duration::from_secs(1), Some(30)).unwrap();
    // 10 units allowed every second with a max burst of 30 units at once

rate.request(20).unwrap(); // Leftover capacity is now 10
rate.request(20).unwrap_err(); // Returns `DeniedFor(1 second)`

Rate adjustment

Gcr::adjust can be used to change the rate of the limiter while preserving the current capacity.

It accepts the same parameters as Gcr::new.

use gcr::Gcr;
use std::time::Duration;

let mut rate = Gcr::new(10, Duration::from_secs(1), Some(30)).unwrap();

rate.adjust(20, Duration::from_secs(1), Some(30)).unwrap();
    // Double the allowed rate while preserving the current capacity

Capacity

Gcr::capacity can be used to get the current capacity of the rate limiter without making a request.

Structs

Gcr

A generic cell rate (GCR) algorithm instance

Enums

GcrCreationError

Errors encountered when creating a new Gcr instance

GcrRequestError

Errors encountered when requesting units from a Gcr instance