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|
use crate::config::ReverseProxyConfig;
use self::remote_hashring::{HashRingWrapper, MetadataMap, VNode};
use anyhow::anyhow;
use opentelemetry::global;
use proto::nova::ratelimit::ratelimiter::{BucketSubmitTicketRequest, HeadersSubmitRequest};
use std::collections::HashMap;
use std::fmt::Debug;
use std::future::Future;
use std::pin::Pin;
use std::sync::Arc;
use std::time::{Duration, SystemTime};
use tokio::sync::{broadcast, RwLock};
use tonic::Request;
use tracing::{debug, error, info_span, instrument, trace_span, Instrument, Span};
use tracing_opentelemetry::OpenTelemetrySpanExt;
mod remote_hashring;
#[derive(Clone, Debug)]
pub struct RemoteRatelimiter {
remotes: Arc<RwLock<HashRingWrapper>>,
current_remotes: Vec<String>,
stop: Arc<tokio::sync::broadcast::Sender<()>>,
config: ReverseProxyConfig,
}
impl Drop for RemoteRatelimiter {
fn drop(&mut self) {
let _ = self
.stop
.clone()
.send(())
.map_err(|_| error!("ratelimiter was already stopped"));
}
}
impl RemoteRatelimiter {
async fn get_ratelimiters(&self) -> Result<(), anyhow::Error> {
// get list of dns responses
let responses: Vec<String> = dns_lookup::lookup_host(&self.config.ratelimiter_address)?
.into_iter()
.filter(|address| address.is_ipv4())
.map(|address| address.to_string())
.collect();
let mut write = self.remotes.write().await;
for ip in &responses {
if !self.current_remotes.contains(&ip) {
let a = VNode::new(ip.to_owned(), self.config.ratelimiter_port).await?;
write.add(a.clone());
}
}
Ok(())
}
#[must_use]
pub fn new(config: ReverseProxyConfig) -> Self {
let (rx, mut tx) = broadcast::channel(1);
let obj = Self {
remotes: Arc::new(RwLock::new(HashRingWrapper::default())),
stop: Arc::new(rx),
config,
current_remotes: vec![]
};
let obj_clone = obj.clone();
// Task to update the ratelimiters in the background
tokio::spawn(async move {
loop {
debug!("refreshing");
match obj_clone.get_ratelimiters().await {
Ok(_) => {
debug!("refreshed ratelimiting servers")
}
Err(err) => {
error!("refreshing ratelimiting servers failed {}", err);
}
}
let sleep = tokio::time::sleep(Duration::from_secs(5));
tokio::pin!(sleep);
tokio::select! {
() = &mut sleep => {
debug!("timer elapsed");
},
_ = tx.recv() => {}
}
}
});
obj
}
#[instrument(name = "ticket task")]
pub fn ticket(
&self,
path: String,
) -> Pin<Box<dyn Future<Output = anyhow::Result<()>> + Send + 'static>> {
let remotes = self.remotes.clone();
Box::pin(
async move {
// Getting the node managing this path
let mut node = remotes
.write()
.instrument(trace_span!("acquiring ring lock"))
.await
.get(&path)
.cloned()
.ok_or_else(|| {
anyhow!(
"did not compute ratelimit because no ratelimiter nodes are detected"
)
})?;
// Initialize span for tracing (headers injection)
let span = info_span!("remote request");
let context = span.context();
let mut request = Request::new(BucketSubmitTicketRequest { path });
global::get_text_map_propagator(|propagator| {
propagator.inject_context(&context, &mut MetadataMap(request.metadata_mut()))
});
// Requesting
node.submit_ticket(request)
.instrument(info_span!("waiting for ticket response"))
.await?;
Ok(())
}
.instrument(Span::current()),
)
}
pub fn submit_headers(
&self,
path: String,
headers: HashMap<String, String>,
) -> Pin<Box<dyn Future<Output = anyhow::Result<()>> + Send + 'static>> {
let remotes = self.remotes.clone();
Box::pin(async move {
let mut node = remotes
.write()
.instrument(trace_span!("acquiring ring lock"))
.await
.get(&path)
.cloned()
.ok_or_else(|| {
anyhow!("did not compute ratelimit because no ratelimiter nodes are detected")
})?;
let span = info_span!("remote request");
let context = span.context();
let time = SystemTime::now()
.duration_since(SystemTime::UNIX_EPOCH)?
.as_millis();
let mut request = Request::new(HeadersSubmitRequest {
path,
precise_time: time as u64,
headers,
});
global::get_text_map_propagator(|propagator| {
propagator.inject_context(&context, &mut MetadataMap(request.metadata_mut()))
});
node.submit_headers(request).await?;
Ok(())
})
}
}
|
