1515a970be
It introduces a new accept_trace function for axum0.7 which can be used to accept a header trace from a received request. This function can be used for tonic 0.12 once that version is released, and the specific `accept_trace` function within `tvix_tracing::propagate::tonic` can then be removed. This also integrates http propagation into the nar_bridge crate. Change-Id: I46dcc797d494bb3977c2633753e7060d88d29129 Reviewed-on: https://cl.tvl.fyi/c/depot/+/11925 Reviewed-by: Brian Olsen <me@griff.name> Tested-by: BuildkiteCI Reviewed-by: Simon Hauser <simon.hauser@helsinki-systems.de> Reviewed-by: flokli <flokli@flokli.de>
48 lines
1.9 KiB
Rust
48 lines
1.9 KiB
Rust
#[cfg(feature = "otlp")]
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use opentelemetry::{global, propagation::Extractor};
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#[cfg(feature = "otlp")]
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use tracing_opentelemetry::OpenTelemetrySpanExt;
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// TODO: accept_trace can be shared with tonic, as soon as tonic upstream has a release with
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// support for axum07. Latest master already has support for axum07 but there is not release yet:
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// https://github.com/hyperium/tonic/pull/1740
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/// Trace context propagation: associate the current span with the otlp trace of the given request,
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/// if any and valid. This only sets the parent trace if the otlp feature is also enabled.
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pub fn accept_trace<B>(request: axum::http::Request<B>) -> axum::http::Request<B> {
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// we only extract and set a parent trace if otlp feature is enabled, otherwise this feature is
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// an noop and we return the request as is
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#[cfg(feature = "otlp")]
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{
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// Current context, if no or invalid data is received.
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let parent_context = global::get_text_map_propagator(|propagator| {
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propagator.extract(&HeaderExtractor(request.headers()))
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});
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tracing::Span::current().set_parent(parent_context);
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}
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request
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}
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/// Helper for extracting headers from HTTP Requests. This is used for OpenTelemetry context
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/// propagation over HTTP.
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#[cfg(feature = "otlp")]
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struct HeaderExtractor<'a>(&'a axum::http::HeaderMap);
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#[cfg(feature = "otlp")]
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impl<'a> Extractor for HeaderExtractor<'a> {
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/// Get a value for a key from the HeaderMap. If the value is not valid ASCII, returns None.
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fn get(&self, key: &str) -> Option<&str> {
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self.0.get(key).and_then(|v| {
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let s = v.to_str();
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if let Err(ref error) = s {
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tracing::warn!(%error, ?v, "cannot convert header value to ASCII")
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};
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s.ok()
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})
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}
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/// Collect all the keys from the HeaderMap.
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fn keys(&self) -> Vec<&str> {
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self.0.keys().map(|k| k.as_str()).collect()
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}
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}
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