Crate tokenbucket
source ·Expand description
This crate provides a simple TokenBucket object for use in rate- limiting.
§Short Example Program
use tokenbucket::TokenBucket;
use tokenbucket::TokenAcquisitionResult;
use std::{thread, time};
// Will acquire tokens at the specified rate for the specified duration.
// After each acquisition, the AcquisitionResult will be printed.
fn run(bucket: &mut TokenBucket, rate: u32, duration: u32) {
for _ in 0..=(rate * duration) {
// Acquire 1 token from the bucket.
let acquisition: TokenAcquisitionResult = bucket.acquire(1.0);
// Determine the acquisition result.
match acquisition {
Ok(rate) => println!("rate/allow: {}, true", rate),
Err(rate) => println!("rate/allow: {}, false", rate),
}
// Sleep for enough time to match the desired rate/second.
thread::sleep(time::Duration::from_micros(
(1000000.0 * (1.0 / rate as f64)) as u64,
));
}
}
fn main() {
// Create the TokenBucket object
let mut token_bucket: TokenBucket = TokenBucket::new(5.0, 100.0);
// Start of by acquiring 60 tokens per second for 10 seconds.
run(&mut token_bucket, 60, 10);
// Slow down to 2 tokens per second for 10 seconds.
run(&mut token_bucket, 2, 10);
}
Structs§
- Represents a thread-safe token bucket object.
Type Aliases§
- Represents the acquisition result from a call to TokenBucket.acquire().