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Showing content from https://docs.rs/tracing-subscriber/0.2/tracing_subscriber/registry/struct.SpanRef.html below:

SpanRef in tracing_subscriber::registry - Rust

pub struct SpanRef<'a, R: LookupSpan<'a>> { /* fields omitted */ }

A reference to span data and the associated registry.

This type implements all the same methods as SpanData, and provides additional methods for querying the registry based on values from the span.

Returns this span’s ID.

Returns a static reference to the span’s metadata.

Returns the span’s name,

Returns a list of fields defined by the span.

Deprecated since 0.2.21:

this method cannot properly support per-layer filtering, and may return the Id of a disabled span if per-layer filtering is in use. use .parent().map(SpanRef::id) instead.

Returns the ID of this span’s parent, or None if this span is the root of its trace tree.

Returns a SpanRef describing this span’s parent, or None if this span is the root of its trace tree.

Returns an iterator over all parents of this span, starting with this span, ordered from leaf to root.

The iterator will first return the span, then the span’s immediate parent, followed by that span’s parent, and so on, until it reaches a root span.

use tracing::{span, Subscriber};
use tracing_subscriber::{
    layer::{Context, Layer},
    prelude::*,
    registry::LookupSpan,
};

struct PrintingLayer;
impl<S> Layer<S> for PrintingLayer
where
    S: Subscriber + for<'lookup> LookupSpan<'lookup>,
{
    fn on_enter(&self, id: &span::Id, ctx: Context<S>) {
        let span = ctx.span(id).unwrap();
        let scope = span.scope().map(|span| span.name()).collect::<Vec<_>>();
        println!("Entering span: {:?}", scope);
    }
}

tracing::subscriber::with_default(tracing_subscriber::registry().with(PrintingLayer), || {
    let _root = tracing::info_span!("root").entered();
    
    let _child = tracing::info_span!("child").entered();
    
    let _leaf = tracing::info_span!("leaf").entered();
    
});

If the opposite order (from the root to this span) is desired, calling Scope::from_root on the returned iterator reverses the order.

impl<S> Layer<S> for PrintingLayer
where
    S: Subscriber + for<'lookup> LookupSpan<'lookup>,
{
    fn on_enter(&self, id: &span::Id, ctx: Context<S>) {
        let span = ctx.span(id).unwrap();
        let scope = span.scope().from_root().map(|span| span.name()).collect::<Vec<_>>();
        println!("Entering span: {:?}", scope);
    }
}

tracing::subscriber::with_default(tracing_subscriber::registry().with(PrintingLayer), || {
    let _root = tracing::info_span!("root").entered();
    
    let _child = tracing::info_span!("child").entered();
    
    let _leaf = tracing::info_span!("leaf").entered();
    
});

Deprecated:

equivalent to self.parent().into_iter().flat_map(SpanRef::scope), but consider whether excluding self is actually intended

Returns an iterator over all parents of this span, starting with the immediate parent.

The iterator will first return the span’s immediate parent, followed by that span’s parent, followed by that span’s parent, and so on, until a it reaches a root span.

Deprecated since 0.2.19:

equivalent to self.parent().into_iter().flat_map(|span| span.scope().from_root()), but consider whether excluding self is actually intended

Returns an iterator over all parents of this span, starting with the root of the trace tree.

The iterator will return the root of the trace tree, followed by the next span, and then the next, until this span’s immediate parent is returned.

Note: this will allocate if there are many spans remaining, or if the “smallvec” feature flag is not enabled.

Returns a reference to this span’s Extensions.

The extensions may be used by Layers to store additional data describing the span.

Returns a mutable reference to this span’s Extensions.

The extensions may be used by Layers to store additional data describing the span.

Formats the value using the given formatter. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.

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