Struct SpanCtx 

pub struct SpanCtx<'a> {
    pub labels: &'a [(&'static str, &'a str)],
    pub spans: &'a [SpanFrame<'a>],
}

Read-only view of the active scope/span context that register_typed-style closures receive. Spec 12 § 3.6.

Carries the labels the user has named in obs::scope! plus the span ancestry (oldest first) for tracing source spans. Keeps two slices borrowed from caller-owned storage so the bridge never allocates.

Fields

labels: &'a [(&'static str, &'a str)]

Labels from the active obs::scope! allowlist, outermost first.

spans: &'a [SpanFrame<'a>]

Tracing span ancestry, oldest first; empty if this SpanCtx originates from a non-bridge path.

Implementations

impl<'a> SpanCtx<'a>

pub const fn empty() -> SpanCtx<'a>

Empty context. Useful for non-bridge call sites that still want to pass a SpanCtx to a typed promotion closure.

pub fn label(&self, name: &str) -> Option<&'a str>

Look up a label by name. Returns the innermost (last) match so nested scopes shadow outer ones.

pub fn span_path(&self) -> Cow<'a, str>

Render the span ancestry as outer:middle:inner (matches ObsTracingForensicEvent.span_path). Empty stack ⇒ empty string.

pub fn target(&self) -> Option<&'a str>

Innermost span’s target, when the stack is non-empty.

Trait Implementations

impl<'a> Clone for SpanCtx<'a>

fn clone(&self) -> SpanCtx<'a>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a> Debug for SpanCtx<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<'a> Copy for SpanCtx<'a>