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Diffstat (limited to '')
| -rw-r--r-- | vendor/tracing-subscriber-0.3.3/src/fmt/format/pretty.rs | 415 |
1 files changed, 415 insertions, 0 deletions
diff --git a/vendor/tracing-subscriber-0.3.3/src/fmt/format/pretty.rs b/vendor/tracing-subscriber-0.3.3/src/fmt/format/pretty.rs new file mode 100644 index 000000000..3e47e2d93 --- /dev/null +++ b/vendor/tracing-subscriber-0.3.3/src/fmt/format/pretty.rs @@ -0,0 +1,415 @@ +use super::*; +use crate::{ + field::{VisitFmt, VisitOutput}, + fmt::fmt_layer::{FmtContext, FormattedFields}, + registry::LookupSpan, +}; + +use std::fmt; +use tracing_core::{ + field::{self, Field}, + Event, Level, Subscriber, +}; + +#[cfg(feature = "tracing-log")] +use tracing_log::NormalizeEvent; + +use ansi_term::{Colour, Style}; + +/// An excessively pretty, human-readable event formatter. +#[derive(Debug, Clone, Eq, PartialEq)] +pub struct Pretty { + display_location: bool, +} + +/// The [visitor] produced by [`Pretty`]'s [`MakeVisitor`] implementation. +/// +/// [visitor]: field::Visit +/// [`MakeVisitor`]: crate::field::MakeVisitor +#[derive(Debug)] +pub struct PrettyVisitor<'a> { + writer: Writer<'a>, + is_empty: bool, + style: Style, + result: fmt::Result, +} + +/// An excessively pretty, human-readable [`MakeVisitor`] implementation. +/// +/// [`MakeVisitor`]: crate::field::MakeVisitor +#[derive(Debug)] +pub struct PrettyFields { + /// A value to override the provided `Writer`'s ANSI formatting + /// configuration. + /// + /// If this is `Some`, we override the `Writer`'s ANSI setting. This is + /// necessary in order to continue supporting the deprecated + /// `PrettyFields::with_ansi` method. If it is `None`, we don't override the + /// ANSI formatting configuration (because the deprecated method was not + /// called). + // TODO: when `PrettyFields::with_ansi` is removed, we can get rid + // of this entirely. + ansi: Option<bool>, +} + +// === impl Pretty === + +impl Default for Pretty { + fn default() -> Self { + Self { + display_location: true, + } + } +} + +impl Pretty { + fn style_for(level: &Level) -> Style { + match *level { + Level::TRACE => Style::new().fg(Colour::Purple), + Level::DEBUG => Style::new().fg(Colour::Blue), + Level::INFO => Style::new().fg(Colour::Green), + Level::WARN => Style::new().fg(Colour::Yellow), + Level::ERROR => Style::new().fg(Colour::Red), + } + } + + /// Sets whether the event's source code location is displayed. + /// + /// This defaults to `true`. + pub fn with_source_location(self, display_location: bool) -> Self { + Self { + display_location, + ..self + } + } +} + +impl<T> Format<Pretty, T> { + /// Sets whether or not the source code location from which an event + /// originated is displayed. + /// + /// This defaults to `true`. + pub fn with_source_location(mut self, display_location: bool) -> Self { + self.format = self.format.with_source_location(display_location); + self + } +} + +impl<C, N, T> FormatEvent<C, N> for Format<Pretty, T> +where + C: Subscriber + for<'a> LookupSpan<'a>, + N: for<'a> FormatFields<'a> + 'static, + T: FormatTime, +{ + fn format_event( + &self, + ctx: &FmtContext<'_, C, N>, + mut writer: Writer<'_>, + 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(); + write!(&mut writer, " ")?; + + // if the `Format` struct *also* has an ANSI color configuration, + // override the writer...the API for configuring ANSI color codes on the + // `Format` struct is deprecated, but we still need to honor those + // configurations. + if let Some(ansi) = self.ansi { + writer = writer.with_ansi(ansi); + } + + self.format_timestamp(&mut writer)?; + + let style = if self.display_level && writer.has_ansi_escapes() { + Pretty::style_for(meta.level()) + } else { + Style::new() + }; + + if self.display_level { + write!( + writer, + "{} ", + super::FmtLevel::new(meta.level(), writer.has_ansi_escapes()) + )?; + } + + if self.display_target { + let target_style = if writer.has_ansi_escapes() { + style.bold() + } else { + style + }; + write!( + writer, + "{}{}{}: ", + target_style.prefix(), + meta.target(), + target_style.infix(style) + )?; + } + let mut v = PrettyVisitor::new(writer.by_ref(), true).with_style(style); + event.record(&mut v); + v.finish()?; + writer.write_char('\n')?; + + let dimmed = if writer.has_ansi_escapes() { + Style::new().dimmed().italic() + } else { + Style::new() + }; + let thread = self.display_thread_name || self.display_thread_id; + if let (true, Some(file), Some(line)) = + (self.format.display_location, meta.file(), meta.line()) + { + write!( + writer, + " {} {}:{}{}", + dimmed.paint("at"), + file, + line, + dimmed.paint(if thread { " " } else { "\n" }) + )?; + } else if thread { + write!(writer, " ")?; + } + + if thread { + write!(writer, "{} ", dimmed.paint("on"))?; + let thread = std::thread::current(); + if self.display_thread_name { + if let Some(name) = thread.name() { + write!(writer, "{}", name)?; + if self.display_thread_id { + write!(writer, " ({:?})", thread.id())?; + } + } else if !self.display_thread_id { + write!(writer, " {:?}", thread.id())?; + } + } else if self.display_thread_id { + write!(writer, " {:?}", thread.id())?; + } + writer.write_char('\n')?; + } + + let bold = writer.bold(); + let span = event + .parent() + .and_then(|id| ctx.span(id)) + .or_else(|| ctx.lookup_current()); + + let scope = span.into_iter().flat_map(|span| span.scope()); + + for span in scope { + let meta = span.metadata(); + if self.display_target { + write!( + writer, + " {} {}::{}", + dimmed.paint("in"), + meta.target(), + bold.paint(meta.name()), + )?; + } else { + write!( + writer, + " {} {}", + dimmed.paint("in"), + bold.paint(meta.name()), + )?; + } + + let ext = span.extensions(); + let fields = &ext + .get::<FormattedFields<N>>() + .expect("Unable to find FormattedFields in extensions; this is a bug"); + if !fields.is_empty() { + write!(writer, " {} {}", dimmed.paint("with"), fields)?; + } + writer.write_char('\n')?; + } + + writer.write_char('\n') + } +} + +impl<'writer> FormatFields<'writer> for Pretty { + fn format_fields<R: RecordFields>(&self, writer: Writer<'writer>, fields: R) -> fmt::Result { + let mut v = PrettyVisitor::new(writer, false); + fields.record(&mut v); + v.finish() + } + + fn add_fields( + &self, + current: &'writer mut FormattedFields<Self>, + fields: &span::Record<'_>, + ) -> fmt::Result { + let empty = current.is_empty(); + let writer = current.as_writer(); + let mut v = PrettyVisitor::new(writer, empty); + fields.record(&mut v); + v.finish() + } +} + +// === impl PrettyFields === + +impl Default for PrettyFields { + fn default() -> Self { + Self::new() + } +} + +impl PrettyFields { + /// Returns a new default [`PrettyFields`] implementation. + pub fn new() -> Self { + // By default, don't override the `Writer`'s ANSI colors + // configuration. We'll only do this if the user calls the + // deprecated `PrettyFields::with_ansi` method. + Self { ansi: None } + } + + /// Enable ANSI encoding for formatted fields. + #[deprecated( + since = "0.3.3", + note = "Use `fmt::Subscriber::with_ansi` or `fmt::Layer::with_ansi` instead." + )] + pub fn with_ansi(self, ansi: bool) -> Self { + Self { + ansi: Some(ansi), + ..self + } + } +} + +impl<'a> MakeVisitor<Writer<'a>> for PrettyFields { + type Visitor = PrettyVisitor<'a>; + + #[inline] + fn make_visitor(&self, mut target: Writer<'a>) -> Self::Visitor { + if let Some(ansi) = self.ansi { + target = target.with_ansi(ansi); + } + PrettyVisitor::new(target, true) + } +} + +// === impl PrettyVisitor === + +impl<'a> PrettyVisitor<'a> { + /// Returns a new default visitor that formats to the provided `writer`. + /// + /// # Arguments + /// - `writer`: the writer to format to. + /// - `is_empty`: whether or not any fields have been previously written to + /// that writer. + pub fn new(writer: Writer<'a>, is_empty: bool) -> Self { + Self { + writer, + is_empty, + style: Style::default(), + result: Ok(()), + } + } + + pub(crate) fn with_style(self, style: Style) -> Self { + Self { style, ..self } + } + + fn write_padded(&mut self, value: &impl fmt::Debug) { + let padding = if self.is_empty { + self.is_empty = false; + "" + } else { + ", " + }; + self.result = write!(self.writer, "{}{:?}", padding, value); + } + + fn bold(&self) -> Style { + if self.writer.has_ansi_escapes() { + self.style.bold() + } else { + Style::new() + } + } +} + +impl<'a> field::Visit for PrettyVisitor<'a> { + fn record_str(&mut self, field: &Field, value: &str) { + if self.result.is_err() { + return; + } + + 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() { + let bold = self.bold(); + self.record_debug( + field, + &format_args!( + "{}, {}{}.sources{}: {}", + value, + bold.prefix(), + field, + bold.infix(self.style), + ErrorSourceList(source), + ), + ) + } else { + self.record_debug(field, &format_args!("{}", value)) + } + } + + fn record_debug(&mut self, field: &Field, value: &dyn fmt::Debug) { + if self.result.is_err() { + return; + } + let bold = self.bold(); + match field.name() { + "message" => self.write_padded(&format_args!("{}{:?}", self.style.prefix(), value,)), + // Skip fields that are actually log metadata that have already been handled + #[cfg(feature = "tracing-log")] + name if name.starts_with("log.") => self.result = Ok(()), + name if name.starts_with("r#") => self.write_padded(&format_args!( + "{}{}{}: {:?}", + bold.prefix(), + &name[2..], + bold.infix(self.style), + value + )), + name => self.write_padded(&format_args!( + "{}{}{}: {:?}", + bold.prefix(), + name, + bold.infix(self.style), + value + )), + }; + } +} + +impl<'a> VisitOutput<fmt::Result> for PrettyVisitor<'a> { + fn finish(mut self) -> fmt::Result { + write!(&mut self.writer, "{}", self.style.suffix())?; + self.result + } +} + +impl<'a> VisitFmt for PrettyVisitor<'a> { + fn writer(&mut self) -> &mut dyn fmt::Write { + &mut self.writer + } +} |