hoc/src/telemetry.rs

use tracing::{subscriber::set_global_default, Subscriber};
use tracing_bunyan_formatter::{BunyanFormattingLayer, JsonStorageLayer};
use tracing_log::LogTracer;
use tracing_subscriber::{layer::SubscriberExt, EnvFilter, Registry};

pub fn get_subscriber(name: &str, env_filter: &str) -> impl Subscriber + Send + Sync {
    let env_filter =
        EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new(env_filter));

    let formatting_layer = BunyanFormattingLayer::new(name.to_string(), std::io::stdout);

    Registry::default()
        .with(env_filter)
        .with(JsonStorageLayer)
        .with(formatting_layer)
}

/// # Panics
///
/// This panics if the `LogTracer` cannot be initialized or `subscriber` cannot be set as global
/// default.
pub fn init_subscriber(subscriber: impl Subscriber + Send + Sync) {
    LogTracer::init().expect("Failed to set logger");
    set_global_default(subscriber).expect("Failed to set tracing subscriber");
}