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feat[tracing-subscriber]: extra fields #2733

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8537bb7
feat[tracing-subscriber]: extra fields
hseeberger Oct 2, 2023
7dc4917
Update tracing-subscriber/src/fmt/format/mod.rs
hseeberger Feb 19, 2024
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1 change: 1 addition & 0 deletions tracing-subscriber/Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,7 @@ json = ["tracing-serde", "serde", "serde_json"]
# Enables support for local time when using the `time` crate timestamp
# formatters.
local-time = ["time/local-offset"]
extra-fields = []

[dependencies]
tracing-core = { path = "../tracing-core", version = "0.2", default-features = false }
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9 changes: 9 additions & 0 deletions tracing-subscriber/src/fmt/fmt_subscriber.rs
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Expand Up @@ -590,6 +590,15 @@ where
_inner: self._inner,
}
}

/// Set the function to make extra fields.
#[cfg(feature = "extra-fields")]
pub fn with_extra_fields(self, make_extra_fields: Box<dyn format::MakeExtraFields>) -> Self {
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Nit, the other methods are named with_make_extra_fields, maybe it would be better to use just one of the two names.

Subscriber {
fmt_event: self.fmt_event.with_make_extra_fields(make_extra_fields),
..self
}
}
}

#[cfg(feature = "json")]
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7 changes: 7 additions & 0 deletions tracing-subscriber/src/fmt/format/json.rs
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Expand Up @@ -304,6 +304,13 @@ where
.serialize_entry("threadId", &format!("{:?}", std::thread::current().id()))?;
}

#[cfg(feature = "extra-fields")]
if let Some((make_extra_fields, current_span)) = self.make_extra_fields.as_ref().zip(current_span) {
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You should also add an option to line 236 so that the current span is present even if it is not to be logged.

for (k, v) in make_extra_fields(current_span.extensions()) {
serializer.serialize_entry(&k, &v)?;
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I think this needs to be moved to where fields serialization happens. Currently, the output is this for me even though I did not want to flatten it (lorem and foo are extra fields):

{
  "timestamp": "fake time",
  "level": "INFO",
  "fields": {
    "message": "hello"
  },
  "target": "tracing_subscriber::fmt::format::test",
  "span": {
    "name": "span"
  },
  "spans": [
    {
      "name": "span"
    }
  ],
  "lorem": "ipsum",
  "foo": "bar"
}

This can be used when the fields are flattened but when not, this will most likely need to be merged with event.field_map().

I tried to simplify this by calling serializer.serialize_entry("fields", ...) twice, but it will create two entries in the JSON map called fields so I don't think there is any way except for merging (or maybe just chaining will work if this takes an iterator).

}
}

serializer.end()
};

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63 changes: 63 additions & 0 deletions tracing-subscriber/src/fmt/format/mod.rs
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Expand Up @@ -60,6 +60,11 @@ mod pretty;
#[cfg_attr(docsrs, doc(cfg(feature = "ansi")))]
pub use pretty::*;

#[cfg(feature = "extra-fields")]
use crate::registry::Extensions;
#[cfg(feature = "extra-fields")]
use std::collections::HashMap;

use fmt::{Debug, Display};

/// A type that can format a tracing [`Event`] to a [`Writer`].
Expand Down Expand Up @@ -413,6 +418,43 @@ pub struct Format<F = Full, T = SystemTime> {
pub(crate) display_thread_name: bool,
pub(crate) display_filename: bool,
pub(crate) display_line_number: bool,
#[cfg(feature = "extra-fields")]
pub(crate) make_extra_fields: Option<Box<dyn MakeExtraFields>>,
}

/// Make extra fields.
#[cfg(feature = "extra-fields")]
pub trait MakeExtraFields: Fn(Extensions<'_>) -> HashMap<String, String> + Send + Sync {
/// Clone self into a boxed [MakeTraceId].
fn clone_box<'a>(&self) -> Box<dyn 'a + MakeExtraFields>
where
Self: 'a;
}

#[cfg(feature = "extra-fields")]
impl Debug for Box<dyn MakeExtraFields> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "MakeExtraFields")
}
}

#[cfg(feature = "extra-fields")]
impl<F> MakeExtraFields for F
where
F: Fn(Extensions<'_>) -> HashMap<String, String> + Clone + Send + Sync {
fn clone_box<'a>(&self) -> Box<dyn 'a + MakeExtraFields>
where
Self: 'a,
{
Box::new(self.clone())
}
}

#[cfg(feature = "extra-fields")]
impl<'a> Clone for Box<dyn 'a + MakeExtraFields> {
fn clone(&self) -> Self {
self.clone_box()
}
}

// === impl Writer ===
Expand Down Expand Up @@ -603,6 +645,8 @@ impl Default for Format<Full, SystemTime> {
display_thread_name: false,
display_filename: false,
display_line_number: false,
#[cfg(feature = "extra-fields")]
make_extra_fields: None,
}
}
}
Expand All @@ -623,6 +667,8 @@ impl<F, T> Format<F, T> {
display_thread_name: self.display_thread_name,
display_filename: self.display_filename,
display_line_number: self.display_line_number,
#[cfg(feature = "extra-fields")]
make_extra_fields: None,
}
}

Expand Down Expand Up @@ -662,6 +708,8 @@ impl<F, T> Format<F, T> {
display_thread_name: self.display_thread_name,
display_filename: true,
display_line_number: true,
#[cfg(feature = "extra-fields")]
make_extra_fields: None,
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Please take the extra fields from self. Here and in all other instances of this.

If this sets it to None, we cannot do some chains such as builder.with_make_extra_fields(...).with_timer(...) because you'll lose this.

}
}

Expand Down Expand Up @@ -694,6 +742,8 @@ impl<F, T> Format<F, T> {
display_thread_name: self.display_thread_name,
display_filename: self.display_filename,
display_line_number: self.display_line_number,
#[cfg(feature = "extra-fields")]
make_extra_fields: None,
}
}

Expand Down Expand Up @@ -723,6 +773,8 @@ impl<F, T> Format<F, T> {
display_thread_name: self.display_thread_name,
display_filename: self.display_filename,
display_line_number: self.display_line_number,
#[cfg(feature = "extra-fields")]
make_extra_fields: None,
}
}

Expand All @@ -739,6 +791,8 @@ impl<F, T> Format<F, T> {
display_thread_name: self.display_thread_name,
display_filename: self.display_filename,
display_line_number: self.display_line_number,
#[cfg(feature = "extra-fields")]
make_extra_fields: None,
}
}

Expand Down Expand Up @@ -841,6 +895,15 @@ impl<F, T> Format<F, T> {
Ok(())
}

/// Set the function to make extra fields.
#[cfg(feature = "extra-fields")]
pub fn with_make_extra_fields(self, make_extra_fields: Box<dyn MakeExtraFields>) -> Self {
Format {
make_extra_fields: Some(make_extra_fields),
..self
}
}

#[inline]
fn format_timestamp(&self, writer: &mut Writer<'_>) -> fmt::Result
where
Expand Down