MeiliSearch/meilisearch/src/middleware.rs

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//! Contains all the custom middleware used in meilisearch
use std::future::{ready, Ready};
2022-10-20 18:00:07 +02:00
use actix_web::dev::{self, Service, ServiceRequest, ServiceResponse, Transform};
use actix_web::web::Data;
use actix_web::Error;
use futures_util::future::LocalBoxFuture;
use index_scheduler::IndexScheduler;
use prometheus::HistogramTimer;
pub struct RouteMetrics;
// Middleware factory is `Transform` trait from actix-service crate
// `S` - type of the next service
// `B` - type of response's body
impl<S, B> Transform<S, ServiceRequest> for RouteMetrics
where
S: Service<ServiceRequest, Response = ServiceResponse<B>, Error = Error>,
S::Future: 'static,
B: 'static,
{
type Response = ServiceResponse<B>;
type Error = Error;
type InitError = ();
type Transform = RouteMetricsMiddleware<S>;
type Future = Ready<Result<Self::Transform, Self::InitError>>;
fn new_transform(&self, service: S) -> Self::Future {
ready(Ok(RouteMetricsMiddleware { service }))
}
}
pub struct RouteMetricsMiddleware<S> {
service: S,
}
impl<S, B> Service<ServiceRequest> for RouteMetricsMiddleware<S>
where
S: Service<ServiceRequest, Response = ServiceResponse<B>, Error = Error>,
S::Future: 'static,
B: 'static,
{
type Response = ServiceResponse<B>;
type Error = Error;
type Future = LocalBoxFuture<'static, Result<Self::Response, Self::Error>>;
dev::forward_ready!(service);
fn call(&self, req: ServiceRequest) -> Self::Future {
let mut histogram_timer: Option<HistogramTimer> = None;
// calling unwrap here is safe because index scheduler is added to app data while creating actix app.
// also, the tests will fail if this is not present.
let index_scheduler = req.app_data::<Data<IndexScheduler>>().unwrap();
let features = index_scheduler.features();
if features.check_metrics().is_ok() {
let request_path = req.path();
let is_registered_resource = req.resource_map().has_resource(request_path);
if is_registered_resource {
let request_method = req.method().to_string();
histogram_timer = Some(
crate::metrics::MEILISEARCH_HTTP_RESPONSE_TIME_SECONDS
.with_label_values(&[&request_method, request_path])
.start_timer(),
);
crate::metrics::MEILISEARCH_HTTP_REQUESTS_TOTAL
.with_label_values(&[&request_method, request_path])
.inc();
}
};
let fut = self.service.call(req);
Box::pin(async move {
let res = fut.await?;
if let Some(histogram_timer) = histogram_timer {
histogram_timer.observe_duration();
};
Ok(res)
})
}
}