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use std::env::var;
use std::fs::File;
use std::io::{self, stderr, Stderr, Write};
use std::path::Path;
use std::sync::Mutex;
use lazy_static::{initialize, lazy_static};
use log::{set_logger, set_max_level, warn, LevelFilter, Log, Metadata, Record};
lazy_static! {
static ref STATE: Mutex<LoggerState> = {
Mutex::new(LoggerState {
out: Out::Stderr(stderr()),
level: LevelFilter::Trace,
show_detail_level: LevelFilter::Debug,
})
};
}
const LOGGER: Logger = Logger {};
pub fn init() {
initialize(&STATE);
set_logger(&LOGGER).unwrap();
set_max_level(LevelFilter::Trace);
if let Ok(sbak_log) = var("SBAK_LOG") {
match sbak_log.to_ascii_lowercase().as_str() {
"off" => set_level(LevelFilter::Off),
"error" => set_level(LevelFilter::Error),
"warn" => set_level(LevelFilter::Warn),
"info" => set_level(LevelFilter::Info),
"debug" => set_level(LevelFilter::Debug),
"trace" => set_level(LevelFilter::Trace),
s => warn!("unknown log level SBAK_LOG={}", s),
}
}
}
pub fn use_stderr() {
let mut state = STATE.lock().unwrap();
state.out = Out::Stderr(stderr());
}
pub fn use_file<P: AsRef<Path>>(path: P) -> Result<(), io::Error> {
let f = File::create(&path)?;
let mut state = STATE.lock().unwrap();
state.out = Out::File(f);
Ok(())
}
pub fn set_level(level: LevelFilter) {
let mut state = STATE.lock().unwrap();
state.level = level;
}
pub fn set_show_detail_level(level: LevelFilter) {
let mut state = STATE.lock().unwrap();
state.show_detail_level = level;
}
struct Logger;
impl Log for Logger {
fn enabled(&self, metadata: &Metadata) -> bool {
let state = STATE.lock().unwrap();
metadata.level() <= state.level
}
fn log(&self, record: &Record) {
if !self.enabled(record.metadata()) {
return;
}
let mut state = STATE.lock().unwrap();
let show_detail = record.level() >= state.show_detail_level;
let w = state.out.writer();
if show_detail {
writeln!(
w,
"[ {:5} ] {}:{} : {}",
record.level(),
record.module_path().unwrap_or("<unknown module>"),
record
.line()
.map(|n| n.to_string())
.unwrap_or_else(|| "??".to_owned()),
record.args()
)
.unwrap();
} else {
writeln!(
w,
"[ {:5} ] {} : {}",
record.level(),
record.module_path().unwrap_or("<unknown module>"),
record.args()
)
.unwrap();
}
}
fn flush(&self) {
let mut state = STATE.lock().unwrap();
let w = state.out.writer();
w.flush().unwrap();
}
}
struct LoggerState {
out: Out,
level: LevelFilter,
show_detail_level: LevelFilter,
}
enum Out {
Stderr(Stderr),
File(File),
}
impl Out {
fn writer(&mut self) -> &mut dyn Write {
match self {
Out::Stderr(ref mut w) => w,
Out::File(ref mut w) => w,
}
}
}