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//! `MakeVisitor` wrappers for working with `fmt::Display` fields.
use super::{MakeVisitor, VisitFmt, VisitOutput};
use tracing_core::field::{Field, Visit};
use core::fmt;
/// A visitor wrapper that ensures any strings named "message" are formatted
/// using `fmt::Display`
#[derive(Debug, Clone)]
pub struct Messages<V>(V);
// TODO(eliza): When `error` as a primitive type is stable, add a
// `DisplayErrors` wrapper...
// === impl Messages ===
//
impl<V> Messages<V> {
/// Returns a new [`MakeVisitor`] implementation that will wrap `inner` so
/// that any strings named `message` are formatted using `fmt::Display`.
///
/// [`MakeVisitor`]: ../trait.MakeVisitor.html
pub fn new(inner: V) -> Self {
Messages(inner)
}
}
impl<T, V> MakeVisitor<T> for Messages<V>
where
V: MakeVisitor<T>,
{
type Visitor = Messages<V::Visitor>;
#[inline]
fn make_visitor(&self, target: T) -> Self::Visitor {
Messages(self.0.make_visitor(target))
}
}
impl<V> Visit for Messages<V>
where
V: Visit,
{
#[inline]
fn record_f64(&mut self, field: &Field, value: f64) {
self.0.record_f64(field, value)
}
#[inline]
fn record_i64(&mut self, field: &Field, value: i64) {
self.0.record_i64(field, value)
}
#[inline]
fn record_u64(&mut self, field: &Field, value: u64) {
self.0.record_u64(field, value)
}
#[inline]
fn record_bool(&mut self, field: &Field, value: bool) {
self.0.record_bool(field, value)
}
/// Visit a string value.
fn record_str(&mut self, field: &Field, value: &str) {
if field.name() == "message" {
self.0.record_debug(field, &format_args!("{}", value))
} else {
self.0.record_str(field, value)
}
}
// TODO(eliza): add RecordError when stable
// fn record_error(&mut self, field: &Field, value: &(dyn std::error::Error + 'static)) {
// self.record_debug(field, &format_args!("{}", value))
// }
#[inline]
fn record_debug(&mut self, field: &Field, value: &dyn fmt::Debug) {
self.0.record_debug(field, value)
}
}
impl<V, O> VisitOutput<O> for Messages<V>
where
V: VisitOutput<O>,
{
#[inline]
fn finish(self) -> O {
self.0.finish()
}
}
feature! {
#![feature = "std"]
use super::VisitWrite;
use std::io;
impl<V> VisitWrite for Messages<V>
where
V: VisitWrite,
{
#[inline]
fn writer(&mut self) -> &mut dyn io::Write {
self.0.writer()
}
}
}
impl<V> VisitFmt for Messages<V>
where
V: VisitFmt,
{
#[inline]
fn writer(&mut self) -> &mut dyn fmt::Write {
self.0.writer()
}
}
|
