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use log::{LevelFilter, Log, Metadata, Record};
use std::io::Write as _;
pub struct Logger {
show_timestamp: bool,
}
impl Logger {
/// Initialize the global logger.
///
/// `level` is the configured log level (from config or CLI).
/// `RUST_LOG` env var overrides it if set and valid.
/// Timestamps are omitted when `JOURNAL_STREAM` is set (systemd/journald).
///
/// # Panics
///
/// Panics if called more than once (the global logger can only be set once).
pub fn init(level: LevelFilter) {
let effective_level = std::env::var("RUST_LOG")
.ok()
.and_then(|s| parse_level(&s))
.unwrap_or(level);
let show_timestamp = std::env::var_os("JOURNAL_STREAM").is_none();
let logger = Self { show_timestamp };
log::set_boxed_logger(Box::new(logger)).expect("logger already initialized");
log::set_max_level(effective_level);
}
}
fn parse_level(s: &str) -> Option<LevelFilter> {
match s.trim().to_lowercase().as_str() {
"trace" => Some(LevelFilter::Trace),
"debug" => Some(LevelFilter::Debug),
"info" => Some(LevelFilter::Info),
"warn" => Some(LevelFilter::Warn),
"error" => Some(LevelFilter::Error),
"off" => Some(LevelFilter::Off),
_ => None,
}
}
impl Log for Logger {
fn enabled(&self, metadata: &Metadata) -> bool {
metadata.level() <= log::max_level()
}
fn log(&self, record: &Record) {
if !self.enabled(record.metadata()) {
return;
}
let mut stderr = std::io::stderr().lock();
if self.show_timestamp {
let now = crate::time::format_log_timestamp(std::time::SystemTime::now());
let _ = writeln!(stderr, "{now} {:>5} {}", record.level(), record.args());
} else {
let _ = writeln!(stderr, "{:>5} {}", record.level(), record.args());
}
}
fn flush(&self) {
let _ = std::io::stderr().flush();
}
}
#[cfg(test)]
#[allow(clippy::unwrap_used)]
mod tests {
use super::*;
#[test]
fn parse_level_valid_levels() {
assert_eq!(parse_level("trace"), Some(LevelFilter::Trace));
assert_eq!(parse_level("debug"), Some(LevelFilter::Debug));
assert_eq!(parse_level("info"), Some(LevelFilter::Info));
assert_eq!(parse_level("warn"), Some(LevelFilter::Warn));
assert_eq!(parse_level("error"), Some(LevelFilter::Error));
}
#[test]
fn parse_level_case_insensitive() {
assert_eq!(parse_level("DEBUG"), Some(LevelFilter::Debug));
assert_eq!(parse_level("Debug"), Some(LevelFilter::Debug));
assert_eq!(parse_level("dEbUg"), Some(LevelFilter::Debug));
}
#[test]
fn parse_level_invalid_returns_none() {
assert_eq!(parse_level("invalid"), None);
assert_eq!(parse_level(""), None);
assert_eq!(parse_level("verbose"), None);
}
#[test]
fn parse_level_off() {
assert_eq!(parse_level("off"), Some(LevelFilter::Off));
}
#[test]
fn parse_level_trimmed() {
assert_eq!(parse_level(" info "), Some(LevelFilter::Info));
assert_eq!(parse_level("\tdebug\n"), Some(LevelFilter::Debug));
}
#[test]
fn enabled_respects_max_level() {
let logger = Logger {
show_timestamp: true,
};
// Set max level to Warn for this test
log::set_max_level(LevelFilter::Warn);
let warn_meta = log::MetadataBuilder::new().level(log::Level::Warn).build();
let debug_meta = log::MetadataBuilder::new().level(log::Level::Debug).build();
assert!(logger.enabled(&warn_meta));
assert!(!logger.enabled(&debug_meta));
}
}
|
