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// Copyright 2021-2026 ReductSoftware UG
// Licensed under the Apache License, Version 2.0
use chrono::prelude::{DateTime, Utc};
use log::{Level, Log, Metadata, Record};
use std::collections::BTreeMap;
use std::sync::{LazyLock, RwLock};
use thread_id;
static LOGGER: Logger = Logger;
pub struct Logger;
static PATHS: LazyLock<RwLock<BTreeMap<String, Level>>> =
LazyLock::new(|| RwLock::new(BTreeMap::new()));
impl Log for Logger {
fn enabled(&self, metadata: &Metadata) -> bool {
let paths = PATHS.read().unwrap();
// Check paths in reverse order (most specific first)
for (path, level) in paths.iter().rev() {
if path.is_empty() {
return metadata.level() <= *level;
}
if metadata.target().replace("::", "/").starts_with(path) {
return metadata.level() <= *level;
}
}
false
}
fn log(&self, record: &Record) {
if self.enabled(record.metadata()) {
let now: DateTime<Utc> = Utc::now();
let file = if let Some(file) = record.file() {
// Absolute path to crate, remove path to registry
match file.split_once("src/") {
Some((_, file)) => file,
None => file,
}
} else {
"(unknown)"
};
let package_name = if let Some(package_name) = record.target().split_once(':') {
package_name.0
} else {
record.target()
};
println!(
"{} ({:>5}) [{}] -- {:}/{:}:{:} {:?}",
now.format("%Y-%m-%d %H:%M:%S.%3f"),
thread_id::get() % 100000,
record.level(),
package_name,
file,
record.line().unwrap(),
record.args(),
);
}
}
fn flush(&self) {}
}
impl Logger {
/// Initialize the logger.
///
/// # Arguments
///
/// * `level` - The log level to use. Can be one of TRACE, DEBUG, INFO, WARN, ERROR.
pub fn init(levels: &str) {
let mut max_level = Level::Trace;
{
let mut paths = PATHS.write().unwrap();
paths.clear();
paths.insert("".to_string(), Level::Info); // default level
}
for level in levels.split(',') {
let mut parts = level.splitn(2, '=');
let mut path = parts.next().unwrap().trim();
let level = if let Some(lvl) = parts.next() {
lvl.trim()
} else {
// for case INFO,path=DEBUG
let lvl = path;
path = ""; // root
lvl
};
let level = match level.to_uppercase().as_str() {
"TRACE" => Level::Trace,
"DEBUG" => Level::Debug,
"INFO" => Level::Info,
"WARN" => Level::Warn,
"ERROR" => Level::Error,
_ => {
eprintln!("Invalid log level: {}, defaulting to INFO", level);
Level::Info
}
};
max_level = std::cmp::max(max_level, level);
PATHS.write().unwrap().insert(path.to_string(), level);
}
log::set_logger(&LOGGER).ok();
log::set_max_level(max_level.to_level_filter());
}
}
#[cfg(test)]
mod tests {
use super::*;
use serial_test::serial;
#[test]
#[serial]
fn it_works() {
Logger::init("INFO");
log::info!("Hello, world!");
}
#[test]
#[serial]
fn test_log_levels() {
Logger::init("DEBUG,path=TRACE,crate/module=ERROR");
assert_eq!(
LOGGER.enabled(
&Metadata::builder()
.level(Level::Info)
.target("crate")
.build()
),
true
);
assert_eq!(
LOGGER.enabled(
&Metadata::builder()
.level(Level::Debug)
.target("crate")
.build()
),
true
);
assert_eq!(
LOGGER.enabled(
&Metadata::builder()
.level(Level::Trace)
.target("crate")
.build()
),
false
);
assert_eq!(
LOGGER.enabled(
&Metadata::builder()
.level(Level::Error)
.target("crate/module")
.build()
),
true
);
assert_eq!(
LOGGER.enabled(
&Metadata::builder()
.level(Level::Warn)
.target("crate/module")
.build()
),
false
);
assert_eq!(
LOGGER.enabled(
&Metadata::builder()
.level(Level::Info)
.target("other")
.build()
),
true
);
assert_eq!(
LOGGER.enabled(
&Metadata::builder()
.level(Level::Debug)
.target("other")
.build()
),
true
);
assert_eq!(
LOGGER.enabled(
&Metadata::builder()
.level(Level::Trace)
.target("other")
.build()
),
false
);
}
#[test]
#[serial]
fn test_log_wrong_level() {
Logger::init("WRONG");
assert_eq!(
LOGGER.enabled(
&Metadata::builder()
.level(Level::Info)
.target("crate")
.build()
),
true,
"Default level is INFO"
);
assert_eq!(
LOGGER.enabled(
&Metadata::builder()
.level(Level::Debug)
.target("crate")
.build()
),
false
);
}
}