lemmy/src/telemetry.rs

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Rust
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use console_subscriber::ConsoleLayer;
use lemmy_utils::error::LemmyResult;
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use opentelemetry::{
sdk::{propagation::TraceContextPropagator, Resource},
KeyValue,
};
use opentelemetry_otlp::WithExportConfig;
use tracing::{subscriber::set_global_default, Subscriber};
use tracing_subscriber::{filter::Targets, layer::SubscriberExt, registry::LookupSpan, Layer};
pub fn init_tracing<S>(opentelemetry_url: &str, subscriber: S, targets: Targets) -> LemmyResult<()>
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where
S: Subscriber + for<'a> LookupSpan<'a> + Send + Sync + 'static,
{
opentelemetry::global::set_text_map_propagator(TraceContextPropagator::new());
let console_layer = ConsoleLayer::builder()
.with_default_env()
.server_addr(([0, 0, 0, 0], 6669))
.event_buffer_capacity(1024 * 1024)
.spawn();
let subscriber = subscriber.with(console_layer);
let tracer = opentelemetry_otlp::new_pipeline()
.tracing()
.with_trace_config(
opentelemetry::sdk::trace::config()
.with_resource(Resource::new(vec![KeyValue::new("service.name", "lemmy")])),
)
.with_exporter(
opentelemetry_otlp::new_exporter()
.tonic()
.with_endpoint(opentelemetry_url),
)
.install_batch(opentelemetry::runtime::Tokio)?;
let otel_layer = tracing_opentelemetry::layer()
.with_tracer(tracer)
.with_filter(targets);
let subscriber = subscriber.with(otel_layer);
set_global_default(subscriber)?;
Ok(())
}