1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51

use std::sync::Once;

use tracing_forest::ForestLayer;
use tracing_subscriber::fmt::format::FmtSpan;
use tracing_subscriber::layer::SubscriberExt;
use tracing_subscriber::util::SubscriberInitExt;
use tracing_subscriber::{EnvFilter, Registry};

static INIT: Once = Once::new();

/// A simple logger.
///
/// Set the `RUST_LOG` environment variable to be set to `info` or `debug`.
pub fn setup_logger() {
    INIT.call_once(|| {
        let default_filter = "off";
        let env_filter = EnvFilter::try_from_default_env()
            .unwrap_or_else(|_| EnvFilter::new(default_filter))
            .add_directive("p3_keccak_air=off".parse().unwrap())
            .add_directive("p3_fri=off".parse().unwrap())
            .add_directive("p3_dft=off".parse().unwrap())
            .add_directive("p3_challenger=off".parse().unwrap());

        // if the RUST_LOGGER environment variable is set, use it to determine which logger to configure
        // (tracing_forest or tracing_subscriber)
        // otherwise, default to 'forest'
        let logger_type = std::env::var("RUST_LOGGER").unwrap_or_else(|_| "flat".to_string());
        match logger_type.as_str() {
            "forest" => {
                Registry::default()
                    .with(env_filter)
                    .with(ForestLayer::default())
                    .init();
            }
            "flat" => {
                tracing_subscriber::fmt::Subscriber::builder()
                    .compact()
                    .with_file(false)
                    .with_target(false)
                    .with_thread_names(false)
                    .with_env_filter(env_filter)
                    .with_span_events(FmtSpan::CLOSE)
                    .finish()
                    .init();
            }
            _ => {
                panic!("Invalid logger type: {}", logger_type);
            }
        }
    });
}