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// TODO Temporary file until we have a better logging setup for slog
use slog::{Drain, KV};
use std::fmt::{self, Arguments, Write};
pub struct LogBridge<T>(pub T);
impl<T: log::Log> Drain for LogBridge<T> {
type Ok = ();
type Err = slog::Error;
fn log(&self, record: &slog::Record, kvs: &slog::OwnedKVList) -> Result<(), Self::Err> {
let mut target = record.tag();
if target.is_empty() {
target = record.module();
}
let lazy = LazyLog::new(record, kvs);
self.0.log(
&log::Record::builder()
.args(format_args!("{}", lazy))
.level(level_to_log(record.level()))
.target(target)
.module_path_static(Some(record.module()))
.file_static(Some(record.file()))
.line(Some(record.line()))
.build(),
);
Ok(())
}
fn is_enabled(&self, level: slog::Level) -> bool {
let meta = log::Metadata::builder().level(level_to_log(level)).build();
self.0.enabled(&meta)
}
}
fn level_to_log(level: slog::Level) -> log::Level {
match level {
slog::Level::Critical | slog::Level::Error => log::Level::Error,
slog::Level::Warning => log::Level::Warn,
slog::Level::Info => log::Level::Info,
slog::Level::Debug => log::Level::Debug,
slog::Level::Trace => log::Level::Trace,
}
}
struct LazyLog<'a> {
record: &'a slog::Record<'a>,
kvs: &'a slog::OwnedKVList,
}
impl<'a> LazyLog<'a> {
fn new(record: &'a slog::Record, kvs: &'a slog::OwnedKVList) -> Self {
LazyLog { record, kvs }
}
}
impl<'a> fmt::Display for LazyLog<'a> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.record.msg())?;
let mut ser = StringSerializer::new();
self.kvs
.serialize(self.record, &mut ser)
.map_err(|_| fmt::Error)?;
self.record
.kv()
.serialize(self.record, &mut ser)
.map_err(|_| fmt::Error)?;
write!(f, "{}", ser.finish())
}
}
struct StringSerializer {
inner: String,
}
impl StringSerializer {
fn new() -> Self {
StringSerializer {
inner: String::new(),
}
}
fn finish(self) -> String {
self.inner
}
}
impl slog::Serializer for StringSerializer {
fn emit_arguments(&mut self, key: slog::Key, value: &Arguments) -> slog::Result {
write!(self.inner, ", {}: {}", key, value)?;
Ok(())
}
}
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