dipper 0.5.3

An out-of-the-box modular dependency injection web application framework.
Documentation 
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use opentelemetry_http::HeaderExtractor;

use crate::{
    http::headers::{self, HeaderMap, HeaderMapExt, HeaderName, HeaderValue},
    otel::{
        otel_trace::{FutureExt, Span, SpanKind, TraceContextExt, Tracer},
        semantic_conventions::{attribute, trace},
        *,
    },
    prelude::*,
};

/// Middleware for tracing with OpenTelemetry.
pub struct TraceHoop {
    tracer: ArcTracer,
}

impl Default for TraceHoop {
    fn default() -> Self {
        Self::new()
    }
}

impl TraceHoop {
    /// Create `Tracing` middleware with `tracer`.
    pub fn new() -> Self {
        Self { tracer: arc_tracer() }
    }
}

#[async_trait]
impl Handler for TraceHoop {
    async fn handle(&self, req: &mut Request, depot: &mut Depot, res: &mut Response, ctrl: &mut FlowCtrl) {
        let remote_addr = req.remote_addr().to_string();

        // TODO: Will remove after opentelemetry_http updated
        let mut headers = HeaderMap::with_capacity(req.headers().len());
        headers.extend(req.headers().into_iter().map(|(name, value)| {
            let name = HeaderName::from_bytes(name.as_ref()).expect("Invalid header name");
            let value = HeaderValue::from_bytes(value.as_ref()).expect("Invalid header value");
            (name, value)
        }));

        let parent_cx = get_text_map_propagator(|propagator| propagator.extract(&HeaderExtractor(&headers)));

        let mut attributes = Vec::new();
        attributes.push(KeyValue::new(trace::HTTP_REQUEST_METHOD, req.method().to_string()));
        attributes.push(KeyValue::new(trace::URL_FULL, req.uri().to_string()));
        attributes.push(KeyValue::new(trace::CLIENT_ADDRESS, remote_addr));
        attributes.push(KeyValue::new(
            trace::NETWORK_PROTOCOL_VERSION,
            format!("{:?}", req.version()),
        ));
        let mut span = self
            .tracer
            .span_builder(format!("{} {}", req.method(), req.uri()))
            .with_kind(SpanKind::Server)
            .with_attributes(attributes)
            .start_with_context(&self.tracer, &parent_cx);

        span.add_event("request.started".to_string(), vec![]);

        (async move {
            ctrl.call_next(req, depot, res).await;
            let cx = Context::current();
            let span = cx.span();
            let status = res.status_code.unwrap_or(StatusCode::OK);
            let event = if status.is_client_error() || status.is_server_error() {
                "request.failure"
            } else {
                "request.success"
            };
            span.add_event(event.to_string(), vec![]);
            span.set_attribute(KeyValue::new(trace::HTTP_RESPONSE_STATUS_CODE, status.as_u16() as i64));
            #[allow(clippy::cast_possible_truncation, clippy::cast_possible_wrap)]
            if let Some(content_length) = res.headers().typed_get::<headers::ContentLength>() {
                span.set_attribute(KeyValue::new(
                    attribute::HTTP_RESPONSE_BODY_SIZE,
                    content_length.0 as i64,
                ));
            }
        })
        .with_context(Context::current_with_span(span))
        .await
    }
}