service_conventions 0.0.38

Conventions for services
Documentation 
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use tracing::Level;
use tracing_subscriber::filter::LevelFilter;
use tracing_subscriber::prelude::*;
use tracing_subscriber::registry;

use opentelemetry_sdk::trace::Tracer;
use tracing_opentelemetry::OpenTelemetryLayer;

use opentelemetry_otlp::WithTonicConfig;
use tracing_subscriber::prelude::__tracing_subscriber_SubscriberExt;

pub fn setup(level: Level) {
    use opentelemetry::global;
    use opentelemetry_sdk::propagation::TraceContextPropagator;
    global::set_text_map_propagator(TraceContextPropagator::new());

    let subscriber = registry()
        .with(
            OpenTelemetryLayer::new(init_tracer())
                .with_error_records_to_exceptions(true)
                .with_filter(LevelFilter::from_level(level)),
        )
        .with(
            tracing_subscriber::fmt::layer()
                .json()
                .with_filter(LevelFilter::from_level(level)),
        );
    tracing::subscriber::set_global_default(subscriber).expect("Could not setup tracing/logging");
}

// Construct Tracer for OpenTelemetryLayer
fn init_tracer() -> Tracer {
    use opentelemetry::trace::TracerProvider as _;
    use opentelemetry_sdk::trace::SdkTracerProvider;
    let tls_config =
        opentelemetry_otlp::tonic_types::transport::ClientTlsConfig::new().with_enabled_roots();
    let exporter = opentelemetry_otlp::SpanExporter::builder()
        .with_tonic()
        .with_tls_config(tls_config)
        .build()
        .expect("Init Exporter");
    let provider = SdkTracerProvider::builder()
        .with_batch_exporter(exporter)
        .build();
    let tracer = provider.tracer("service_conventions");

    opentelemetry::global::set_tracer_provider(provider);
    return tracer;
}