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| 1 | +use opentelemetry_sdk::propagation::{ |
| 2 | + BaggagePropagator, TextMapCompositePropagator, TraceContextPropagator, |
| 3 | +}; |
| 4 | + |
| 5 | +pub mod extension { |
| 6 | + pub use opentelemetry::baggage::BaggageExt as _; |
| 7 | + pub use tracing_opentelemetry::OpenTelemetrySpanExt as _; |
| 8 | +} |
| 9 | + |
| 10 | +/// Currently axum and reqwest have different http crate versions. |
| 11 | +/// axum is ver 1, reqwest ver 0.2, therefore, we use each type in inject and extract. |
| 12 | +pub mod http { |
| 13 | + use super::extension::*; |
| 14 | + use opentelemetry::propagation::Extractor; |
| 15 | + use opentelemetry_http::HeaderInjector; |
| 16 | + |
| 17 | + /// Inject current opentelemetry context into given headers |
| 18 | + pub fn inject(cx: &opentelemetry::Context, headers: &mut reqwest::header::HeaderMap) { |
| 19 | + opentelemetry::global::get_text_map_propagator(|propagator| { |
| 20 | + propagator.inject_context(cx, &mut HeaderInjector(headers)); |
| 21 | + }); |
| 22 | + } |
| 23 | + pub fn inject_with_baggage<T, I>( |
| 24 | + cx: &opentelemetry::Context, |
| 25 | + headers: &mut reqwest::header::HeaderMap, |
| 26 | + baggage: T, |
| 27 | + ) where |
| 28 | + T: IntoIterator<Item = I>, |
| 29 | + I: Into<opentelemetry::baggage::KeyValueMetadata>, |
| 30 | + { |
| 31 | + inject(&cx.with_baggage(baggage), headers); |
| 32 | + } |
| 33 | + |
| 34 | + pub fn extract(headers: &axum::http::HeaderMap) -> opentelemetry::Context { |
| 35 | + opentelemetry::global::get_text_map_propagator(|propagator| { |
| 36 | + propagator.extract(&HeaderExtractor(headers)) |
| 37 | + }) |
| 38 | + } |
| 39 | + |
| 40 | + /// `opentelemetry_http` implement `HeaderExtractor` against http 0.2 |
| 41 | + /// so, imple manually |
| 42 | + struct HeaderExtractor<'a>(pub &'a axum::http::HeaderMap); |
| 43 | + |
| 44 | + impl<'a> Extractor for HeaderExtractor<'a> { |
| 45 | + /// Get a value for a key from the `HeaderMap`. If the value is not valid ASCII, returns None. |
| 46 | + fn get(&self, key: &str) -> Option<&str> { |
| 47 | + self.0.get(key).and_then(|value| value.to_str().ok()) |
| 48 | + } |
| 49 | + |
| 50 | + /// Collect all the keys from the `HeaderMap`. |
| 51 | + fn keys(&self) -> Vec<&str> { |
| 52 | + self.0 |
| 53 | + .keys() |
| 54 | + .map(axum::http::HeaderName::as_str) |
| 55 | + .collect::<Vec<_>>() |
| 56 | + } |
| 57 | + } |
| 58 | +} |
| 59 | + |
| 60 | +pub fn init_propagation() { |
| 61 | + let trace_propagator = TraceContextPropagator::new(); |
| 62 | + let baggage_propagator = BaggagePropagator::new(); |
| 63 | + let composite_propagator = TextMapCompositePropagator::new(vec![ |
| 64 | + Box::new(trace_propagator), |
| 65 | + Box::new(baggage_propagator), |
| 66 | + ]); |
| 67 | + |
| 68 | + opentelemetry::global::set_text_map_propagator(composite_propagator); |
| 69 | +} |
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