use super::span;
use super::time::{self, FormatTime, SystemTime};
#[cfg(feature = "tracing-log")]
use tracing_log::NormalizeEvent;
use std::fmt::{self, Write};
use std::marker::PhantomData;
use tracing_core::{
field::{self, Field},
Event, Level,
};
#[cfg(feature = "ansi")]
use ansi_term::{Colour, Style};
pub trait FormatEvent<N> {
fn format_event(
&self,
ctx: &span::Context<'_, N>,
writer: &mut dyn fmt::Write,
event: &Event<'_>,
) -> fmt::Result;
}
impl<N> FormatEvent<N>
for fn(&span::Context<'_, N>, &mut dyn fmt::Write, &Event<'_>) -> fmt::Result
{
fn format_event(
&self,
ctx: &span::Context<'_, N>,
writer: &mut dyn fmt::Write,
event: &Event<'_>,
) -> fmt::Result {
(*self)(ctx, writer, event)
}
}
#[derive(Default, Debug, Copy, Clone, Eq, PartialEq)]
pub struct Compact;
#[derive(Default, Debug, Copy, Clone, Eq, PartialEq)]
pub struct Full;
#[derive(Debug, Clone)]
pub struct Format<F = Full, T = SystemTime> {
format: PhantomData<F>,
timer: T,
ansi: bool,
display_target: bool,
}
impl Default for Format<Full, SystemTime> {
fn default() -> Self {
Format {
format: PhantomData,
timer: SystemTime,
ansi: true,
display_target: true,
}
}
}
impl<F, T> Format<F, T> {
pub fn compact(self) -> Format<Compact, T> {
Format {
format: PhantomData,
timer: self.timer,
ansi: self.ansi,
display_target: self.display_target,
}
}
pub fn with_timer<T2>(self, timer: T2) -> Format<F, T2> {
Format {
format: self.format,
timer,
ansi: self.ansi,
display_target: self.display_target,
}
}
pub fn without_time(self) -> Format<F, ()> {
Format {
format: self.format,
timer: (),
ansi: self.ansi,
display_target: self.display_target,
}
}
pub fn with_ansi(self, ansi: bool) -> Format<F, T> {
Format { ansi, ..self }
}
pub fn with_target(self, display_target: bool) -> Format<F, T> {
Format {
display_target,
..self
}
}
}
impl<N, T> FormatEvent<N> for Format<Full, T>
where
N: for<'a> super::NewVisitor<'a>,
T: FormatTime,
{
fn format_event(
&self,
ctx: &span::Context<'_, N>,
writer: &mut dyn fmt::Write,
event: &Event<'_>,
) -> fmt::Result {
#[cfg(feature = "tracing-log")]
let normalized_meta = event.normalized_metadata();
#[cfg(feature = "tracing-log")]
let meta = normalized_meta.as_ref().unwrap_or_else(|| event.metadata());
#[cfg(not(feature = "tracing-log"))]
let meta = event.metadata();
#[cfg(feature = "ansi")]
time::write(&self.timer, writer, self.ansi)?;
#[cfg(not(feature = "ansi"))]
time::write(&self.timer, writer)?;
let (fmt_level, full_ctx) = {
#[cfg(feature = "ansi")]
{
(
FmtLevel::new(meta.level(), self.ansi),
FullCtx::new(&ctx, self.ansi),
)
}
#[cfg(not(feature = "ansi"))]
{
(FmtLevel::new(meta.level()), FullCtx::new(&ctx))
}
};
write!(
writer,
"{} {}{}: ",
fmt_level,
full_ctx,
if self.display_target {
meta.target()
} else {
""
}
)?;
{
let mut recorder = ctx.new_visitor(writer, true);
event.record(&mut recorder);
}
writeln!(writer)
}
}
impl<N, T> FormatEvent<N> for Format<Compact, T>
where
N: for<'a> super::NewVisitor<'a>,
T: FormatTime,
{
fn format_event(
&self,
ctx: &span::Context<'_, N>,
writer: &mut dyn fmt::Write,
event: &Event<'_>,
) -> fmt::Result {
#[cfg(feature = "tracing-log")]
let normalized_meta = event.normalized_metadata();
#[cfg(feature = "tracing-log")]
let meta = normalized_meta.as_ref().unwrap_or_else(|| event.metadata());
#[cfg(not(feature = "tracing-log"))]
let meta = event.metadata();
#[cfg(feature = "ansi")]
time::write(&self.timer, writer, self.ansi)?;
#[cfg(not(feature = "ansi"))]
time::write(&self.timer, writer)?;
let (fmt_level, fmt_ctx) = {
#[cfg(feature = "ansi")]
{
(
FmtLevel::new(meta.level(), self.ansi),
FmtCtx::new(&ctx, self.ansi),
)
}
#[cfg(not(feature = "ansi"))]
{
(FmtLevel::new(meta.level()), FmtCtx::new(&ctx))
}
};
write!(
writer,
"{} {}{}: ",
fmt_level,
fmt_ctx,
if self.display_target {
meta.target()
} else {
""
}
)?;
{
let mut recorder = ctx.new_visitor(writer, true);
event.record(&mut recorder);
}
ctx.with_current(|(_, span)| write!(writer, " {}", span.fields()))
.unwrap_or(Ok(()))?;
writeln!(writer)
}
}
#[derive(Debug)]
pub struct NewRecorder {
_p: (),
}
impl NewRecorder {
pub(crate) fn new() -> Self {
Self { _p: () }
}
}
pub struct Recorder<'a> {
writer: &'a mut dyn Write,
is_empty: bool,
}
impl<'a> Recorder<'a> {
pub(crate) fn new(writer: &'a mut dyn Write, is_empty: bool) -> Self {
Self { writer, is_empty }
}
fn maybe_pad(&mut self) {
if self.is_empty {
self.is_empty = false;
} else {
let _ = write!(self.writer, " ");
}
}
}
impl<'a> super::NewVisitor<'a> for NewRecorder {
type Visitor = Recorder<'a>;
#[inline]
fn make(&self, writer: &'a mut dyn Write, is_empty: bool) -> Self::Visitor {
Recorder::new(writer, is_empty)
}
}
impl<'a> field::Visit for Recorder<'a> {
fn record_str(&mut self, field: &Field, value: &str) {
if field.name() == "message" {
self.record_debug(field, &format_args!("{}", value))
} else {
self.record_debug(field, &value)
}
}
fn record_error(&mut self, field: &Field, value: &(dyn std::error::Error + 'static)) {
if let Some(source) = value.source() {
self.record_debug(
field,
&format_args!("{} {}.source={}", value, field, source),
)
} else {
self.record_debug(field, &format_args!("{}", value))
}
}
fn record_debug(&mut self, field: &Field, value: &dyn fmt::Debug) {
self.maybe_pad();
let _ = match field.name() {
"message" => write!(self.writer, "{:?}", value),
#[cfg(feature = "tracing-log")]
name if name.starts_with("log.") => Ok(()),
name if name.starts_with("r#") => write!(self.writer, "{}={:?}", &name[2..], value),
name => write!(self.writer, "{}={:?}", name, value),
};
}
}
impl<'a> fmt::Debug for Recorder<'a> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("Recorder")
.field("writer", &format_args!("<dyn fmt::Write>"))
.field("is_empty", &self.is_empty)
.finish()
}
}
struct FmtCtx<'a, N> {
ctx: &'a span::Context<'a, N>,
#[cfg(feature = "ansi")]
ansi: bool,
}
impl<'a, N: 'a> FmtCtx<'a, N> {
#[cfg(feature = "ansi")]
pub(crate) fn new(ctx: &'a span::Context<'a, N>, ansi: bool) -> Self {
Self { ctx, ansi }
}
#[cfg(not(feature = "ansi"))]
pub(crate) fn new(ctx: &'a span::Context<'a, N>) -> Self {
Self { ctx }
}
}
#[cfg(feature = "ansi")]
impl<'a, N> fmt::Display for FmtCtx<'a, N>
where
N: super::NewVisitor<'a>,
{
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let mut seen = false;
self.ctx.visit_spans(|_, span| {
if seen {
f.pad(":")?;
}
seen = true;
if self.ansi {
write!(f, "{}", Style::new().bold().paint(span.name()))
} else {
write!(f, "{}", span.name())
}
})?;
if seen {
f.pad(" ")?;
}
Ok(())
}
}
#[cfg(not(feature = "ansi"))]
impl<'a, N> fmt::Display for FmtCtx<'a, N> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let mut seen = false;
self.ctx.visit_spans(|_, span| {
if seen {
f.pad(":")?;
}
seen = true;
write!(f, "{}", span.name())
})?;
if seen {
f.pad(" ")?;
}
Ok(())
}
}
struct FullCtx<'a, N> {
ctx: &'a span::Context<'a, N>,
#[cfg(feature = "ansi")]
ansi: bool,
}
impl<'a, N: 'a> FullCtx<'a, N> {
#[cfg(feature = "ansi")]
pub(crate) fn new(ctx: &'a span::Context<'a, N>, ansi: bool) -> Self {
Self { ctx, ansi }
}
#[cfg(not(feature = "ansi"))]
pub(crate) fn new(ctx: &'a span::Context<'a, N>) -> Self {
Self { ctx }
}
}
#[cfg(feature = "ansi")]
impl<'a, N> fmt::Display for FullCtx<'a, N>
where
N: super::NewVisitor<'a>,
{
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let mut seen = false;
let style = if self.ansi {
Style::new().bold()
} else {
Style::new()
};
self.ctx.visit_spans(|_, span| {
write!(f, "{}", style.paint(span.name()))?;
seen = true;
let fields = span.fields();
if !fields.is_empty() {
write!(f, "{}{}{}", style.paint("{"), fields, style.paint("}"))?;
}
":".fmt(f)
})?;
if seen {
f.pad(" ")?;
}
Ok(())
}
}
#[cfg(not(feature = "ansi"))]
impl<'a, N> fmt::Display for FullCtx<'a, N> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let mut seen = false;
self.ctx.visit_spans(|_, span| {
write!(f, "{}", span.name())?;
seen = true;
let fields = span.fields();
if !fields.is_empty() {
write!(f, "{{{}}}", fields)?;
}
":".fmt(f)
})?;
if seen {
f.pad(" ")?;
}
Ok(())
}
}
struct FmtLevel<'a> {
level: &'a Level,
#[cfg(feature = "ansi")]
ansi: bool,
}
impl<'a> FmtLevel<'a> {
#[cfg(feature = "ansi")]
pub(crate) fn new(level: &'a Level, ansi: bool) -> Self {
Self { level, ansi }
}
#[cfg(not(feature = "ansi"))]
pub(crate) fn new(level: &'a Level) -> Self {
Self { level }
}
}
#[cfg(not(feature = "ansi"))]
impl<'a> fmt::Display for FmtLevel<'a> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match *self.level {
Level::TRACE => f.pad("TRACE"),
Level::DEBUG => f.pad("DEBUG"),
Level::INFO => f.pad("INFO"),
Level::WARN => f.pad("WARN"),
Level::ERROR => f.pad("ERROR"),
}
}
}
#[cfg(feature = "ansi")]
impl<'a> fmt::Display for FmtLevel<'a> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
if self.ansi {
match *self.level {
Level::TRACE => write!(f, "{}", Colour::Purple.paint("TRACE")),
Level::DEBUG => write!(f, "{}", Colour::Blue.paint("DEBUG")),
Level::INFO => write!(f, "{}", Colour::Green.paint(" INFO")),
Level::WARN => write!(f, "{}", Colour::Yellow.paint(" WARN")),
Level::ERROR => write!(f, "{}", Colour::Red.paint("ERROR")),
}
} else {
match *self.level {
Level::TRACE => f.pad("TRACE"),
Level::DEBUG => f.pad("DEBUG"),
Level::INFO => f.pad("INFO"),
Level::WARN => f.pad("WARN"),
Level::ERROR => f.pad("ERROR"),
}
}
}
}
#[cfg(test)]
mod test {
use crate::fmt::test::MockWriter;
use crate::fmt::time::FormatTime;
use lazy_static::lazy_static;
use tracing::{self, subscriber::with_default};
use std::fmt;
use std::sync::Mutex;
struct MockTime;
impl FormatTime for MockTime {
fn format_time(&self, w: &mut dyn fmt::Write) -> fmt::Result {
write!(w, "fake time")
}
}
#[cfg(feature = "ansi")]
#[test]
fn with_ansi_true() {
lazy_static! {
static ref BUF: Mutex<Vec<u8>> = Mutex::new(vec![]);
}
let make_writer = || MockWriter::new(&BUF);
let expected = "\u{1b}[2mfake time\u{1b}[0m\u{1b}[32m INFO\u{1b}[0m tracing_subscriber::fmt::format::test: some ansi test\n";
test_ansi(make_writer, expected, true, &BUF);
}
#[cfg(feature = "ansi")]
#[test]
fn with_ansi_false() {
lazy_static! {
static ref BUF: Mutex<Vec<u8>> = Mutex::new(vec![]);
}
let make_writer = || MockWriter::new(&BUF);
let expected = "fake time INFO tracing_subscriber::fmt::format::test: some ansi test\n";
test_ansi(make_writer, expected, false, &BUF);
}
#[cfg(not(feature = "ansi"))]
#[test]
fn without_ansi() {
lazy_static! {
static ref BUF: Mutex<Vec<u8>> = Mutex::new(vec![]);
}
let make_writer = || MockWriter::new(&BUF);
let expected = "fake time INFO tracing_subscriber::fmt::format::test: some ansi test\n";
let subscriber = crate::fmt::Subscriber::builder()
.with_writer(make_writer)
.with_timer(MockTime)
.finish();
with_default(subscriber, || {
tracing::info!("some ansi test");
});
let actual = String::from_utf8(BUF.try_lock().unwrap().to_vec()).unwrap();
assert_eq!(expected, actual.as_str());
}
#[cfg(feature = "ansi")]
fn test_ansi<T>(make_writer: T, expected: &str, is_ansi: bool, buf: &Mutex<Vec<u8>>)
where
T: crate::fmt::MakeWriter + Send + Sync + 'static,
{
let subscriber = crate::fmt::Subscriber::builder()
.with_writer(make_writer)
.with_ansi(is_ansi)
.with_timer(MockTime)
.finish();
with_default(subscriber, || {
tracing::info!("some ansi test");
});
let actual = String::from_utf8(buf.try_lock().unwrap().to_vec()).unwrap();
assert_eq!(expected, actual.as_str());
}
}