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//! Enable tracing using Opentelemetry and Jaeger.
//!
//! This module init a tracing propagator for Rust code that requires tracing, and is
//! able to serialize and deserialize context that has been sent via the middleware.
use eyre::Context as EyreContext;
use tracing::metadata::LevelFilter;
use tracing_subscriber::{
filter::FilterExt, prelude::__tracing_subscriber_SubscriberExt, EnvFilter, Layer,
};
use eyre::ContextCompat;
use tracing_subscriber::Registry;
pub mod telemetry;
pub fn set_up_tracing(name: &str) -> eyre::Result<()> {
// Filter log using `RUST_LOG`. More useful for CLI.
let filter = EnvFilter::from_default_env().or(LevelFilter::WARN);
let stdout_log = tracing_subscriber::fmt::layer()
.pretty()
.with_filter(filter);
let registry = Registry::default().with(stdout_log);
if let Some(endpoint) = std::env::var_os("DORA_JAEGER_TRACING") {
let endpoint = endpoint
.to_str()
.wrap_err("Could not parse env variable: DORA_JAEGER_TRACING")?;
let tracer = crate::telemetry::init_jaeger_tracing(name, endpoint)
.wrap_err("Could not instantiate tracing")?;
let telemetry = tracing_opentelemetry::layer().with_tracer(tracer);
let subscriber = registry.with(telemetry);
tracing::subscriber::set_global_default(subscriber).context(format!(
"failed to set tracing global subscriber for {name}"
))
} else {
tracing::subscriber::set_global_default(registry).context(format!(
"failed to set tracing global subscriber for {name}"
))
}
}
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