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use std::fmt;
use std::io;
use std::str::FromStr;
use std::sync::atomic::AtomicBool;
use std::sync::atomic::Ordering::SeqCst;
use chrono::{DateTime, Local};
use slog;
use slog::DrainExt;
use slog_atomic::{AtomicSwitch, AtomicSwitchCtrl};
use slog_extra::Async;
use slog_stream::{Format, async_stream};
use slog::Level as SlogLevel;
use slog::{LevelFilter, Logger};
use slog::{OwnedKeyValueList, Record};
use slog_stdlog;
lazy_static! {
static ref ATOMIC_DRAIN: AtomicSwitchCtrl<io::Error> = AtomicSwitch::new(
slog::Discard.map_err(|_| io::Error::new(io::ErrorKind::Other, "should not happen"))
).ctrl();
static ref FIRST_RUN: AtomicBool = AtomicBool::new(true);
}
static DEFAULT_LEVEL: &'static LogLevel = &LogLevel::Info;
/// Logger levels from [Log.jsm]
/// (https://developer.mozilla.org/en/docs/Mozilla/JavaScript_code_modules/Log.jsm).
#[derive(Debug, Clone)]
pub enum LogLevel {
Fatal,
Error,
Warn,
Info,
Config,
Debug,
Trace,
}
impl fmt::Display for LogLevel {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
let s = match *self {
LogLevel::Fatal => "FATAL",
LogLevel::Error => "ERROR",
LogLevel::Warn => "WARN",
LogLevel::Info => "INFO",
LogLevel::Config => "CONFIG",
LogLevel::Debug => "DEBUG",
LogLevel::Trace => "TRACE",
};
write!(f, "{}", s)
}
}
impl FromStr for LogLevel {
type Err = ();
fn from_str(s: &str) -> Result<LogLevel, ()> {
match s {
"fatal" => Ok(LogLevel::Fatal),
"error" => Ok(LogLevel::Error),
"warn" => Ok(LogLevel::Warn),
"info" => Ok(LogLevel::Info),
"config" => Ok(LogLevel::Config),
"debug" => Ok(LogLevel::Debug),
"trace" => Ok(LogLevel::Trace),
_ => Err(()),
}
}
}
trait ToSlogLevel {
fn to_slog(&self) -> SlogLevel;
}
impl ToSlogLevel for LogLevel {
fn to_slog(&self) -> SlogLevel {
match *self {
LogLevel::Fatal => SlogLevel::Critical,
LogLevel::Error => SlogLevel::Error,
LogLevel::Warn => SlogLevel::Warning,
LogLevel::Info => SlogLevel::Info,
LogLevel::Config | LogLevel::Debug => SlogLevel::Debug,
LogLevel::Trace => SlogLevel::Trace,
}
}
}
trait ToGeckoLevel {
fn to_gecko(&self) -> LogLevel;
}
impl ToGeckoLevel for SlogLevel {
fn to_gecko(&self) -> LogLevel {
match *self {
SlogLevel::Critical => LogLevel::Fatal,
SlogLevel::Error => LogLevel::Error,
SlogLevel::Warning => LogLevel::Warn,
SlogLevel::Info => LogLevel::Info,
SlogLevel::Debug => LogLevel::Debug,
SlogLevel::Trace => LogLevel::Trace,
}
}
}
/// Initialise logger if it has not been already. The provided `level`
/// filters out log records below this granularity.
pub fn init(level: &Option<LogLevel>) {
let effective_level = level.as_ref().unwrap_or(DEFAULT_LEVEL);
let drain = filtered_gecko_log(&effective_level);
ATOMIC_DRAIN.set(drain);
let first_run = FIRST_RUN.load(SeqCst);
FIRST_RUN.store(false, SeqCst);
if first_run {
let log = Logger::root(ATOMIC_DRAIN.drain().fuse(), o!());
slog_stdlog::set_logger(log.clone()).unwrap();
}
}
fn filtered_gecko_log(level: &LogLevel) -> LevelFilter<Async> {
let io = async_stream(io::stderr(), GeckoFormat {});
slog::level_filter(level.to_slog(), io)
}
struct GeckoFormat;
impl Format for GeckoFormat {
fn format(&self, io: &mut io::Write, record: &Record, _: &OwnedKeyValueList) -> io::Result<()> {
let ts = format_ts(Local::now());
let level = record.level().to_gecko();
let _ = try!(write!(io,
"{}\t{}\t{}\t{}\n",
ts,
record.module(),
level,
record.msg()));
Ok(())
}
}
/// Produces a 13-digit Unix Epoch timestamp similar to Gecko.
fn format_ts(ts: DateTime<Local>) -> String {
format!("{}{:03}", ts.timestamp(), ts.timestamp_subsec_millis())
}
#[cfg(test)]
mod tests {
use chrono::Local;
use super::format_ts;
#[test]
fn test_format_ts() {
let ts = Local::now();
let s = format_ts(ts);
assert_eq!(s.len(), 13);
}
}
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