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pub struct WorkerLayer {
level: tracing::Level,
}
impl WorkerLayer {
pub fn new(level: tracing::Level) -> Self {
Self { level }
}
}
pub struct StringVisitor<'a> {
string: &'a mut String,
}
impl<'a> tracing::field::Visit for StringVisitor<'a> {
fn record_debug(&mut self, field: &tracing::field::Field, value: &dyn std::fmt::Debug) {
use std::fmt::Write;
if field.name() == "message" {
write!(self.string, "{:?}", value).ok();
} else {
write!(self.string, "{} = {:?}; ", field.name(), value).ok();
}
}
}
impl<S: tracing::Subscriber> tracing_subscriber::Layer<S> for WorkerLayer {
fn on_event(
&self,
event: &tracing::Event<'_>,
_ctx: tracing_subscriber::layer::Context<'_, S>,
) {
if event.metadata().level() > &self.level {
return;
}
let date = worker::Date::now().to_string();
let level = event.metadata().level();
let target = event.metadata().target();
let name = event.metadata().name();
let mut fields = String::new();
let mut fields_visitor = StringVisitor {
string: &mut fields,
};
event.record(&mut fields_visitor);
worker::console_log!("{date} {level:>5} {target}: {fields} ({name})");
}
}
static INIT: std::sync::Once = std::sync::Once::new();
pub fn init(env: &worker::Env) {
use tracing_subscriber::prelude::*;
INIT.call_once(|| {
let level = env
.secret("RUST_LOG")
.map(|s| s.to_string())
.unwrap_or("info".to_string())
.parse::<tracing::Level>()
.unwrap_or(tracing::Level::INFO);
let subscriber = tracing_subscriber::registry()
.with(tracing_subscriber::fmt::layer().without_time())
.with(WorkerLayer::new(level));
tracing::subscriber::set_global_default(subscriber).unwrap();
});
}