The azalia-log crate is the main crate to use with tracing. It has a WriteLayer struct that allows to use any std::io::Write type in a blocking fashion.
If you want a non-blocking version of WriteLayer, it does support any std::io::Write types and tracing_appender::NonBlocking implements it.
// > Cargo.toml:
//
// [dependencies]
// azalia-log = { version = "*", registry = "noelware" }
// serde_json = "1.0"
// tracing = "*"
// tracing-subscriber = "*"
use azalia_log::WriteLayer;
use serde_json::Value;
use tracing::{Event, Metadata};
use tracing_subscriber::prelude::*;
fn on_event(event: &Event<'_>, metadata: &Metadata<'_>, spans: Vec<Value>) -> String {
let mut buf = String::new();
// do something with `event` or `metadata`
buf
}
fn main() {
let writer = WriteLayer::new_with(std::io::stdout(), on_event);
tracing_subscriber::registry()
.with(writer)
.init();
tracing::info!("Hello, world!");
}Provides some WriteFn implementations for a WriteLayer. This is mainly for Noelware's use-case but you can use them as well.