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|
use std::collections::HashMap;
use std::sync::Arc;
use std::time::Duration;
use opentelemetry::global;
use opentelemetry::propagation::Extractor;
use proto::nova::ratelimit::ratelimiter::HeadersSubmitRequest;
use proto::nova::ratelimit::ratelimiter::{
ratelimiter_server::Ratelimiter, BucketSubmitTicketRequest,
};
use tokio::sync::RwLock;
use tonic::Response;
use tracing::debug;
use tracing_opentelemetry::OpenTelemetrySpanExt;
use twilight_http_ratelimiting::RatelimitHeaders;
use crate::buckets::bucket::Bucket;
use crate::buckets::redis_lock::RedisLock;
use crate::buckets::GlobalLock;
pub struct RLServer {
global: Arc<RedisLock>,
buckets: RwLock<HashMap<String, Arc<Bucket>>>,
}
impl RLServer {
pub fn new(redis_lock: Arc<RedisLock>) -> Self {
Self {
global: redis_lock,
buckets: RwLock::new(HashMap::new()),
}
}
}
struct MetadataMap<'a>(&'a tonic::metadata::MetadataMap);
impl<'a> Extractor for MetadataMap<'a> {
/// Get a value for a key from the `MetadataMap`. If the value can't be converted to &str, returns None
fn get(&self, key: &str) -> Option<&str> {
self.0.get(key).and_then(|metadata| metadata.to_str().ok())
}
/// Collect all the keys from the `MetadataMap`.
fn keys(&self) -> Vec<&str> {
self.0
.keys()
.map(|key| match key {
tonic::metadata::KeyRef::Ascii(v) => v.as_str(),
tonic::metadata::KeyRef::Binary(v) => v.as_str(),
})
.collect::<Vec<_>>()
}
}
#[tonic::async_trait]
impl Ratelimiter for RLServer {
async fn submit_headers(
&self,
request: tonic::Request<HeadersSubmitRequest>,
) -> Result<tonic::Response<()>, tonic::Status> {
let parent_cx =
global::get_text_map_propagator(|prop| prop.extract(&MetadataMap(request.metadata())));
// Generate a tracing span as usual
let span = tracing::span!(tracing::Level::INFO, "request process");
span.set_parent(parent_cx);
let data = request.into_inner();
let ratelimit_headers = RatelimitHeaders::from_pairs(
data.headers.iter().map(|f| (f.0 as &str, f.1.as_bytes())),
)
.unwrap();
if let Some(duration) = self.global.is_locked().await {
tokio::time::sleep(duration).await;
}
let bucket: Arc<Bucket> = if self.buckets.read().await.contains_key(&data.path) {
self.buckets
.read()
.await
.get(&data.path)
.expect("impossible")
.clone()
} else {
let bucket = Bucket::new();
self.buckets.write().await.insert(data.path, bucket.clone());
bucket
};
match ratelimit_headers {
RatelimitHeaders::Global(global) => {
// If we are globally ratelimited, we lock using the redis lock
// This is using redis because a global ratelimit should be executed in all
// ratelimit workers.
debug!(
"global ratelimit headers detected: {}",
global.retry_after()
);
self.global
.clone()
.lock_for(Duration::from_secs(global.retry_after()))
.await;
}
RatelimitHeaders::None => {}
RatelimitHeaders::Present(present) => {
// we should update the bucket.
bucket.update(&present, data.precise_time);
}
_ => unreachable!(),
};
Ok(Response::new(()))
}
async fn submit_ticket(
&self,
request: tonic::Request<BucketSubmitTicketRequest>,
) -> Result<tonic::Response<()>, tonic::Status> {
let parent_cx =
global::get_text_map_propagator(|prop| prop.extract(&MetadataMap(request.metadata())));
// Generate a tracing span as usual
let span = tracing::span!(tracing::Level::INFO, "request process");
span.set_parent(parent_cx);
let data = request.into_inner();
let bucket: Arc<Bucket> = if self.buckets.read().await.contains_key(&data.path) {
self.buckets
.read()
.await
.get(&data.path)
.expect("impossible")
.clone()
} else {
let bucket = Bucket::new();
self.buckets.write().await.insert(data.path, bucket.clone());
bucket
};
// wait for the ticket to be accepted
let _ = bucket.ticket().await;
Ok(Response::new(()))
}
}
|
