2024-08-21 09:28:50 +00:00
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use axum::body::Body;
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use axum::http::{HeaderMap, Request};
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use axum::middleware::Next;
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use axum::response::Response;
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use opentelemetry::propagation::Extractor;
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2024-07-31 08:33:10 +00:00
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use opentelemetry::sdk::propagation::TraceContextPropagator;
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use opentelemetry::sdk::trace;
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use opentelemetry::sdk::trace::Sampler;
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use opentelemetry::sdk::Resource;
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use opentelemetry::{global, KeyValue};
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use opentelemetry_otlp::WithExportConfig;
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2024-08-21 09:28:50 +00:00
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use tracing_opentelemetry::OpenTelemetrySpanExt;
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2024-07-31 08:33:10 +00:00
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use tracing_subscriber::layer::SubscriberExt;
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use tracing_subscriber::util::SubscriberInitExt;
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use tracing_subscriber::{filter::LevelFilter, EnvFilter, Layer};
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/// Init logging using env variables LOG_LEVEL and LOG_FORMAT:
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/// - otlp_endpoint is an optional URL to an Open Telemetry collector
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/// - otlp_service_name service name to appear in APM
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/// - LOG_LEVEL may be TRACE, DEBUG, INFO, WARN or ERROR (default to INFO)
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/// - LOG_FORMAT may be TEXT or JSON (default to TEXT)
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/// - LOG_COLORIZE may be "false" or "true" (default to "true" or ansi supported platforms)
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pub fn init_logging(otlp_endpoint: Option<String>, otlp_service_name: String, json_output: bool) {
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let mut layers = Vec::new();
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// STDOUT/STDERR layer
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let ansi = std::env::var("LOG_COLORIZE") != Ok("1".to_string());
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let fmt_layer = tracing_subscriber::fmt::layer()
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.with_file(true)
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.with_ansi(ansi)
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.with_line_number(true);
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let fmt_layer = match json_output {
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true => fmt_layer.json().flatten_event(true).boxed(),
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false => fmt_layer.boxed(),
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};
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layers.push(fmt_layer);
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// OpenTelemetry tracing layer
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if let Some(otlp_endpoint) = otlp_endpoint {
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global::set_text_map_propagator(TraceContextPropagator::new());
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let tracer = opentelemetry_otlp::new_pipeline()
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.tracing()
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.with_exporter(
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opentelemetry_otlp::new_exporter()
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.tonic()
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.with_endpoint(otlp_endpoint),
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)
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.with_trace_config(
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trace::config()
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.with_resource(Resource::new(vec![KeyValue::new(
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"service.name",
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otlp_service_name,
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)]))
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.with_sampler(Sampler::AlwaysOn),
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)
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.install_batch(opentelemetry::runtime::Tokio);
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if let Ok(tracer) = tracer {
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layers.push(tracing_opentelemetry::layer().with_tracer(tracer).boxed());
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init_tracing_opentelemetry::init_propagator().unwrap();
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};
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}
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// Filter events with LOG_LEVEL
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let varname = "LOG_LEVEL";
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let env_filter = if let Ok(log_level) = std::env::var(varname) {
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// Override to avoid simple logs to be spammed with tokio level informations
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let log_level = match &log_level[..] {
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"warn" => "text_generation_launcher=warn,text_generation_router=warn",
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"info" => "text_generation_launcher=info,text_generation_router=info",
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"debug" => "text_generation_launcher=debug,text_generation_router=debug",
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log_level => log_level,
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};
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EnvFilter::builder()
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.with_default_directive(LevelFilter::INFO.into())
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.parse_lossy(log_level)
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} else {
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EnvFilter::new("info")
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};
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tracing_subscriber::registry()
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.with(env_filter)
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.with(layers)
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.init();
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}
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2024-08-21 09:28:50 +00:00
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struct HeaderExtractor<'a>(&'a HeaderMap);
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impl<'a> Extractor for HeaderExtractor<'a> {
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fn get(&self, key: &str) -> Option<&str> {
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let value = self.0.get(key).and_then(|v| v.to_str().ok());
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value
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}
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fn keys(&self) -> Vec<&str> {
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let keys: Vec<&str> = self.0.keys().map(|k| k.as_str()).collect();
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keys
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}
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}
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pub async fn trace_context_middleware(request: Request<Body>, next: Next) -> Response {
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let parent_ctx = global::get_text_map_propagator(|prop| {
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let headers = request.headers();
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let extractor = HeaderExtractor(headers);
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prop.extract(&extractor)
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});
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let span = tracing::Span::current();
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span.set_parent(parent_ctx);
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next.run(request).await
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}
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