elfo-logger 0.1.3

Logging subsystem
Documentation 
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use tracing::{subscriber::Interest, Level, Metadata, Subscriber};
use tracing_subscriber::layer::{Context, Layer};

use elfo_core::scope;

#[non_exhaustive]
pub(crate) struct FilteringLayer {
    other_max_level: Level,
}

impl FilteringLayer {
    pub(crate) fn new(other_max_level: Level) -> Self {
        Self { other_max_level }
    }
}

impl<S: Subscriber> Layer<S> for FilteringLayer {
    fn register_callsite(&self, _metadata: &'static Metadata<'static>) -> Interest {
        Interest::sometimes()
    }

    fn enabled(&self, metadata: &Metadata<'_>, _ctx: Context<'_, S>) -> bool {
        scope::try_with(|scope| scope.permissions().is_logging_enabled(*metadata.level()))
            .unwrap_or_else(|| *metadata.level() <= self.other_max_level)
    }

    // TODO: implement `max_level_hint()`
}