circus/crates/common/src/tracing_init.rs

//! Tracing initialization helper for all FC daemons.

use tracing_subscriber::EnvFilter;
use tracing_subscriber::fmt;

use crate::config::TracingConfig;

/// Initialize the global tracing subscriber based on configuration.
///
/// Respects `RUST_LOG` environment variable as an override. If `RUST_LOG` is
/// not set, falls back to the configured level.
pub fn init_tracing(config: &TracingConfig) {
    let env_filter =
        EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new(&config.level));

    match config.format.as_str() {
        "json" => {
            let builder = fmt()
                .json()
                .with_target(config.show_targets)
                .with_env_filter(env_filter);
            if config.show_timestamps {
                builder.init();
            } else {
                builder.without_time().init();
            }
        }
        "full" => {
            let builder = fmt()
                .with_target(config.show_targets)
                .with_env_filter(env_filter);
            if config.show_timestamps {
                builder.init();
            } else {
                builder.without_time().init();
            }
        }
        _ => {
            // "compact" or any other value
            let builder = fmt()
                .compact()
                .with_target(config.show_targets)
                .with_env_filter(env_filter);
            if config.show_timestamps {
                builder.init();
            } else {
                builder.without_time().init();
            }
        }
    }
}