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use std::cell::RefCell;
use std::error::Error as StdError;
use std::io::Write;
use std::rc::Rc;
use std::sync::Once;
use std::thread_local;
pub type Flaw = Box<dyn StdError + Send + Sync + 'static>;
struct Piccolog {
filter: bool
}
impl Piccolog {
fn thread_name(&self) -> Rc<String> {
thread_local! {
pub static TNAME: RefCell<Option<Rc<String>>> = RefCell::new(None);
}
let tn = TNAME.with(|c| {
if let Some(n) = c.borrow().as_ref() {
Some(n.clone())
} else {
None
}
});
if let Some(n) = tn {
return n;
}
TNAME.with(|c| {
let t = std::thread::current();
let mut tn = t.name().unwrap_or("-").to_owned();
if tn == "tokio-runtime-worker" {
tn = format!("tokio-w-{:?}", t.id());
}
*c.borrow_mut() = Some(Rc::new(tn));
c.borrow().as_ref().unwrap().clone()
})
}
}
impl log::Log for Piccolog {
fn enabled(&self, meta: &log::Metadata<'_>) -> bool {
!( self.filter &&
!meta.target().starts_with("body_image") &&
!meta.target().starts_with("barc") &&
!meta.target().starts_with("blocking_permit") &&
meta.level() > log::Level::Info )
}
fn log(&self, record: &log::Record<'_>) {
if self.enabled(record.metadata()) {
let tn = self.thread_name();
writeln!(
std::io::stderr(),
"{:5} {} {}: {}",
record.level(), record.target(), tn, record.args()
).ok();
}
}
fn flush(&self) {
std::io::stderr().flush().ok();
}
}
pub fn test_logger() -> bool {
static TEST_LOG_INIT: Once = Once::new();
TEST_LOG_INIT.call_once(|| {
let level = if let Ok(l) = std::env::var("TEST_LOG") {
l.parse().expect("TEST_LOG parse integer")
} else {
0
};
if level > 0 {
setup_logger(level - 1).expect("setup logger");
}
});
true
}
pub fn setup_logger(level: u32) -> Result<(), Flaw> {
if level == 0 {
log::set_max_level(log::LevelFilter::Info)
} else if level < 3 {
log::set_max_level(log::LevelFilter::Debug)
} else {
log::set_max_level(log::LevelFilter::Trace)
}
let filter = level == 1;
log::set_boxed_logger(Box::new(Piccolog { filter }))?;
Ok(())
}
#[cfg(test)]
mod tests {
use super::test_logger;
use log::debug;
#[test]
fn log_setup() {
assert!(test_logger());
debug!("log message");
debug!("log message 2");
}
}