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use std::sync::Arc;
use libopentelemetry::{
global,
trace::{FutureExt, Span, SpanKind, TraceContextExt, Tracer},
Context,
};
use opentelemetry_http::HeaderExtractor;
use opentelemetry_semantic_conventions::{resource, trace};
use crate::{web::headers::HeaderMapExt, Endpoint, IntoResponse, Middleware, Request, Response};
#[cfg_attr(docsrs, doc(cfg(feature = "opentelemetry")))]
pub struct OpenTelemetryTracing<T> {
tracer: Arc<T>,
}
impl<T> OpenTelemetryTracing<T> {
pub fn new(tracer: T) -> Self {
Self {
tracer: Arc::new(tracer),
}
}
}
impl<T, E> Middleware<E> for OpenTelemetryTracing<T>
where
T: Tracer + Send + Sync,
E: Endpoint,
{
type Output = OpenTelemetryTracingEndpoint<T, E>;
fn transform(&self, ep: E) -> Self::Output {
OpenTelemetryTracingEndpoint {
tracer: self.tracer.clone(),
inner: ep,
}
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "opentelemetry")))]
pub struct OpenTelemetryTracingEndpoint<T, E> {
tracer: Arc<T>,
inner: E,
}
#[async_trait::async_trait]
impl<T, E> Endpoint for OpenTelemetryTracingEndpoint<T, E>
where
T: Tracer + Send + Sync,
E: Endpoint,
{
type Output = Response;
async fn call(&self, req: Request) -> Self::Output {
let parent_cx = global::get_text_map_propagator(|propagator| {
propagator.extract(&HeaderExtractor(req.headers()))
});
let mut attributes = Vec::new();
attributes.push(resource::TELEMETRY_SDK_NAME.string(env!("CARGO_CRATE_NAME")));
attributes.push(resource::TELEMETRY_SDK_VERSION.string(env!("CARGO_PKG_VERSION")));
attributes.push(resource::TELEMETRY_SDK_LANGUAGE.string("rust"));
attributes.push(trace::HTTP_METHOD.string(req.method().to_string()));
attributes.push(trace::HTTP_TARGET.string(req.uri().path().to_string()));
attributes.push(trace::HTTP_CLIENT_IP.string(req.remote_addr().to_string()));
attributes.push(trace::HTTP_FLAVOR.string(format!("{:?}", req.version())));
let mut span = self
.tracer
.span_builder(format!("{} {}", req.method(), req.uri()))
.with_kind(SpanKind::Server)
.with_attributes(attributes)
.with_parent_context(parent_cx)
.start(&*self.tracer);
span.add_event("request.started".to_string(), vec![]);
async move {
let resp = self.inner.call(req).await.into_response();
let cx = Context::current();
let span = cx.span();
span.add_event("request.completed".to_string(), vec![]);
span.set_attribute(trace::HTTP_STATUS_CODE.i64(resp.status().as_u16() as i64));
if let Some(content_length) = resp.headers().typed_get::<headers::ContentLength>() {
span.set_attribute(
trace::HTTP_RESPONSE_CONTENT_LENGTH.i64(content_length.0 as i64),
);
}
resp
}
.with_context(Context::current_with_span(span))
.await
}
}