Struct tracing_web::FormatSpanFromFields

pub struct FormatSpanFromFields<N> { /* private fields */ }

An adaptor for Formatters from tracing_subscriber::fmt::format as a FormatSpan.

Uses FormattedFields to store the details attachement, so it might reuse an existing extension for logging, to save some work visiting the recorded fields.

Trait Implementations

impl<N> FormatSpan for FormatSpanFromFields<N>where N: 'static + for<'writer> FormatFields<'writer>,

fn find_details<'ext>(&self, ext: &'ext Extensions<'_>) -> Option<&'ext str>

Find the details in the extensions of a span that will be recorded with the event.

fn add_details(&self, ext: &mut ExtensionsMut<'_>, attrs: &Attributes<'_>)

Called when a span is constructed, with its initial attributes.

fn record_values(&self, ext: &mut ExtensionsMut<'_>, values: &Record<'_>)

Called when a span records some values.