Exporting traces to jaeger.

src/main.rs

@@ -1,8 +1,10 @@
 #![feature(round_char_boundary)]
 use crate::parser::document;
-use tracing_subscriber::fmt::format::FmtSpan;
 use tracing_subscriber::EnvFilter;
 mod parser;
+use tracing_subscriber::fmt;
+use tracing_subscriber::layer::SubscriberExt;
+use tracing_subscriber::util::SubscriberInitExt;
 
 const TEST_DOC: &'static str = include_str!("../toy_language.txt");
 
@@ -16,17 +18,25 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
 
 fn init_telemetry() -> Result<(), Box<dyn std::error::Error>> {
     let env_filter = EnvFilter::try_from_default_env().unwrap_or(EnvFilter::new("WARN"));
-    let format = tracing_subscriber::fmt::format()
+
+    let stdout = fmt::Layer::new()
         .pretty()
         .with_file(true)
         .with_line_number(true)
         .with_thread_ids(false)
         .with_target(false);
-    let subscriber = tracing_subscriber::fmt()
-        .event_format(format)
-        .with_span_events(FmtSpan::ENTER | FmtSpan::EXIT)
-        .with_env_filter(env_filter)
-        .finish();
-    tracing::subscriber::set_global_default(subscriber)?;
+
+    opentelemetry::global::set_text_map_propagator(opentelemetry_jaeger::Propagator::new());
+    let tracer = opentelemetry_jaeger::new_pipeline()
+        .with_service_name("toy_language")
+        .install_simple()?;
+
+    let opentelemetry = tracing_opentelemetry::layer().with_tracer(tracer);
+
+    tracing_subscriber::registry()
+        .with(env_filter)
+        .with(opentelemetry)
+        .with(stdout)
+        .try_init()?;
     Ok(())
 }