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//! A crate to extract and inject a OpenTelemetry context from and to a gRPC request.
//! Inspired by: https://github.com/open-telemetry/opentelemetry-rust gRPC examples
use opentelemetry::global;
use opentelemetry::propagation::{Extractor, Injector};
use tracing_opentelemetry::OpenTelemetrySpanExt;
/// Extract context metadata from a gRPC request's metadata
struct MetadataExtractor<'a>(pub &'a tonic::metadata::MetadataMap);
impl<'a> Extractor for MetadataExtractor<'a> {
/// Get a value for a key from the MetadataMap. If the value can't be converted to &str, returns None
fn get(&self, key: &str) -> Option<&str> {
self.0.get(key).and_then(|metadata| metadata.to_str().ok())
}
/// Collect all the keys from the MetadataMap.
fn keys(&self) -> Vec<&str> {
self.0
.keys()
.map(|key| match key {
tonic::metadata::KeyRef::Ascii(v) => v.as_str(),
tonic::metadata::KeyRef::Binary(v) => v.as_str(),
})
.collect::<Vec<_>>()
}
}
/// Inject context in the metadata of a gRPC request.
struct MetadataInjector<'a>(pub &'a mut tonic::metadata::MetadataMap);
impl<'a> Injector for MetadataInjector<'a> {
/// Set a key and value in the MetadataMap. Does nothing if the key or value are not valid inputs
fn set(&mut self, key: &str, value: String) {
if let Ok(key) = tonic::metadata::MetadataKey::from_bytes(key.as_bytes()) {
if let Ok(val) = value.parse() {
self.0.insert(key, val);
}
}
}
}
/// Get a context from the global context and inject the span into a gRPC request's metadata.
fn inject(metadata: &mut tonic::metadata::MetadataMap) {
global::get_text_map_propagator(|propagator| {
propagator.inject_context(
&tracing::Span::current().context(),
&mut MetadataInjector(metadata),
)
})
}
pub trait InjectTelemetryContext {
fn inject_context(self) -> Self;
}
impl<T> InjectTelemetryContext for tonic::Request<T> {
fn inject_context(mut self) -> Self {
inject(self.metadata_mut());
self
}
}
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