Comments (3)
Feature Request
Crates
tracing-core
?
I think this would be a change in tracing
rather than tracing-core
; the Span
type is from tracing
:)
[...]
The solution outlined above works okay, but it'd be nicer if there existed a sort of "void"Span
that was free to produce, and that did nothing when entered. Ideally I would also not need to giveMetadata
for it, since it shouldn't ever be used.
I think we could implement this rather easily, actually. It could look like this:
impl Span {
// ...
pub fn none() -> Self {
let meta = $crate::callsite! {
name: "no span"
kind: Kind::SPAN,
target: ""
level: Level::TRACE,
fields:
}.metadata();
Self {
meta,
inner: None,
}
}
// ...
}
We could then hack the log support to not log for spans originating at the empty callsite.
We would need to make sure the documentation clearly distinguishes between Span::new_disabled
and Span::none
.
Name is, of course, open to bikeshedding.
from tracing.
As an alternative, we could also move the metadata field optional. I think that might be the right approach. It'd make life easier for a Span::current
function in the case that we're not currently in a span; otherwise, we'd have to return Option<Span>
. And, since it's a reference, it shouldn't make the struct bigger to add an option.
from tracing.
I think this would be a change in tracing rather than tracing-core; the Span type is from tracing :)
Updated!
from tracing.
Related Issues (20)
- Broken link on docs.rs HOT 3
- non_blocking writer do not work HOT 4
- Make method env_var_name public HOT 1
- Broken link in documentation. HOT 2
- [tracing_subscriber::filter::Builder] Proposal for supporting multiple default directives / setting a default filter
- Unqualified `line!` macro usage inside `info!` causes issues with `ratatui_macros` HOT 1
- How to modify EnvFilter instead of replace HOT 3
- RollingFileAppender `prune_old_logs()` relies on `metadata().created()` which is not available on all platforms HOT 1
- Make Layer::with_writer not truncate the file HOT 4
- When will the feature(`valuable` suport`) be merged into stable version? HOT 1
- error[E0609]: no field `free` on type `REGISTRY` HOT 3
- Add an option for outputting span IDs HOT 1
- RollingFileAppender: prefix and suffix custom separator
- `#instrument` attribute not making new spans HOT 2
- Execute custom code every time `error!` (etc) is called HOT 4
- Make path clickable HOT 2
- Lacking documentation of context propagation through channels HOT 2
- `fn subscriber` did exist in the main branch, but not in `tracing-subscriber-0.3.18` HOT 2
- Valuable: Enum Representations
- JSON: Field names should account for `r#` HOT 4
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from tracing.