63 lines
2.2 KiB
Rust
63 lines
2.2 KiB
Rust
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use reqwest::header::{HeaderName, HeaderValue};
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use reqwest::Request;
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use std::str::FromStr;
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use tracing::Span;
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#[cfg(feature = "opentelemetry_0_13")]
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use opentelemetry_0_13_pkg as opentelemetry;
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#[cfg(feature = "opentelemetry_0_14")]
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use opentelemetry_0_14_pkg as opentelemetry;
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#[cfg(feature = "opentelemetry_0_15")]
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use opentelemetry_0_15_pkg as opentelemetry;
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#[cfg(feature = "opentelemetry_0_13")]
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pub use tracing_opentelemetry_0_12_pkg as tracing_opentelemetry;
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#[cfg(feature = "opentelemetry_0_14")]
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pub use tracing_opentelemetry_0_13_pkg as tracing_opentelemetry;
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#[cfg(feature = "opentelemetry_0_15")]
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pub use tracing_opentelemetry_0_14_pkg as tracing_opentelemetry;
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use opentelemetry::global;
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use opentelemetry::propagation::Injector;
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use tracing_opentelemetry::OpenTelemetrySpanExt;
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/// Injects the given Opentelemetry Context into a reqwest::Request headers to allow propagation downstream.
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pub fn inject_opentracing_context_into_request(span: &Span, request: Request) -> Request {
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let context = span.context();
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let mut request = request;
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global::get_text_map_propagator(|injector| {
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injector.inject_context(&context, &mut RequestCarrier::new(&mut request))
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});
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request
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}
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// "traceparent" => https://www.w3.org/TR/trace-context/#trace-context-http-headers-format
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/// Injector used via opentelemetry propagator to tell the extractor how to insert the "traceparent" header value
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/// This will allow the propagator to inject opentelemetry context into a standard data structure. Will basically
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/// insert a "traceparent" string value "{version}-{trace_id}-{span_id}-{trace-flags}" of the spans context into the headers.
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/// Listeners can then re-hydrate the context to add additional spans to the same trace.
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struct RequestCarrier<'a> {
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request: &'a mut Request,
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}
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impl<'a> RequestCarrier<'a> {
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pub fn new(request: &'a mut Request) -> Self {
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RequestCarrier { request }
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}
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}
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impl<'a> Injector for RequestCarrier<'a> {
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fn set(&mut self, key: &str, value: String) {
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let header_name = HeaderName::from_str(key).expect("Must be header name");
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let header_value = HeaderValue::from_str(&value).expect("Must be a header value");
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self.request.headers_mut().insert(header_name, header_value);
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}
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}
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