Struct TracingFieldBuilder 

pub struct TracingFieldBuilder { /* private fields */ }

Builder for TracingField metadata.

Implementations

impl TracingFieldBuilder

pub fn span_field(self, name: &'static str) -> Self

Set the span field name to extract from.

If not set, the context key (from registration) is used as the span field name.

pub fn extract_from_str<T>( self, f: impl Fn(&str) -> Option<T> + Send + Sync + 'static, ) -> Self

where T: Clone + Send + Sync + Serialize + DeserializeOwned + 'static,

Extract from string span field values.

The closure receives the string value and returns Some(T) if conversion succeeds. set_context is called automatically.

pub fn extract_from_u64<T>( self, f: impl Fn(u64) -> Option<T> + Send + Sync + 'static, ) -> Self

where T: Clone + Send + Sync + Serialize + DeserializeOwned + 'static,

Extract from u64 span field values.

pub fn extract_from_i64<T>( self, f: impl Fn(i64) -> Option<T> + Send + Sync + 'static, ) -> Self

where T: Clone + Send + Sync + Serialize + DeserializeOwned + 'static,

Extract from i64 span field values.

pub fn extract_from_bool<T>( self, f: impl Fn(bool) -> Option<T> + Send + Sync + 'static, ) -> Self

where T: Clone + Send + Sync + Serialize + DeserializeOwned + 'static,

Extract from bool span field values.

pub fn enrich_display<T: Display + 'static>(self) -> Self

Enrich log output using Display.

pub fn enrich_debug<T: Debug + 'static>(self) -> Self

Enrich log output using Debug.

pub fn enrich_custom<T: 'static>( self, f: impl Fn(&T) -> String + Send + Sync + 'static, ) -> Self

Enrich log output with a custom formatting function.

pub fn build(self) -> TracingField

Build the TracingField metadata.