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//! A [`RouteProvider`] for dynamic generation of routing urls. | ||
use std::{ | ||
str::FromStr, | ||
sync::atomic::{AtomicUsize, Ordering}, | ||
}; | ||
use url::Url; | ||
|
||
use crate::agent::{ | ||
http_transport::{IC0_DOMAIN, IC0_SUB_DOMAIN}, | ||
AgentError, | ||
}; | ||
|
||
/// A [`RouteProvider`] for dynamic generation of routing urls. | ||
pub trait RouteProvider: Send + Sync { | ||
/// Generate next routing url | ||
fn route(&self) -> Result<Url, AgentError>; | ||
} | ||
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||
/// A simple implementation of the [`RouteProvider``] which produces an even distribution of the urls from the input ones. | ||
pub struct RoundRobinRouteProvider { | ||
routes: Vec<Url>, | ||
current_idx: AtomicUsize, | ||
} | ||
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impl RouteProvider for RoundRobinRouteProvider { | ||
fn route(&self) -> Result<Url, AgentError> { | ||
if self.routes.is_empty() { | ||
return Err(AgentError::RouteProviderError( | ||
"No routing urls provided".to_string(), | ||
)); | ||
} | ||
// This operation wraps around an overflow, i.e. after max is reached the value is reset back to 0. | ||
let prev_idx = self.current_idx.fetch_add(1, Ordering::Relaxed); | ||
Ok(self.routes[prev_idx % self.routes.len()].clone()) | ||
} | ||
} | ||
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impl RoundRobinRouteProvider { | ||
/// Construct [`RoundRobinRouteProvider`] from a vector of urls. | ||
pub fn new<T: AsRef<str>>(routes: Vec<T>) -> Result<Self, AgentError> { | ||
let routes: Result<Vec<Url>, _> = routes | ||
.into_iter() | ||
.map(|url| { | ||
Url::from_str(url.as_ref()).and_then(|mut url| { | ||
// rewrite *.ic0.app to ic0.app | ||
if let Some(domain) = url.domain() { | ||
if domain.ends_with(IC0_SUB_DOMAIN) { | ||
url.set_host(Some(IC0_DOMAIN))? | ||
} | ||
} | ||
url.join("/api/v2/") | ||
}) | ||
}) | ||
.collect(); | ||
Ok(Self { | ||
routes: routes?, | ||
current_idx: AtomicUsize::new(0), | ||
}) | ||
} | ||
} | ||
|
||
#[cfg(test)] | ||
mod tests { | ||
use super::*; | ||
|
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#[test] | ||
fn test_empty_routes() { | ||
let provider = RoundRobinRouteProvider::new::<&str>(vec![]) | ||
.expect("failed to create a route provider"); | ||
let result = provider.route().unwrap_err(); | ||
assert_eq!( | ||
result, | ||
AgentError::RouteProviderError("No routing urls provided".to_string()) | ||
); | ||
} | ||
|
||
#[test] | ||
fn test_routes_rotation() { | ||
let provider = RoundRobinRouteProvider::new(vec!["https://url1.com", "https://url2.com"]) | ||
.expect("failed to create a route provider"); | ||
let url_strings = vec!["https://url1.com", "https://url2.com", "https://url1.com"]; | ||
let expected_urls: Vec<Url> = url_strings | ||
.iter() | ||
.map(|url_str| Url::parse(url_str).expect("Invalid URL")) | ||
.collect(); | ||
let urls: Vec<Url> = (0..3) | ||
.map(|_| provider.route().expect("failed to get next url")) | ||
.collect(); | ||
assert_eq!(expected_urls, urls); | ||
} | ||
} |