Struct Attributes

pub struct Attributes<'a> { /* private fields */ }

Available on crate features dep_tracing and alloc only.

Attributes provided to a Subscriber describing a new span when it is created.

Implementations

impl<'a> Attributes<'a>

pub fn new( metadata: &'static Metadata<'static>, values: &'a ValueSet<'a>, ) -> Attributes<'a>

Returns Attributes describing a new child span of the current span, with the provided metadata and values.

pub fn new_root( metadata: &'static Metadata<'static>, values: &'a ValueSet<'a>, ) -> Attributes<'a>

Returns Attributes describing a new span at the root of its own trace tree, with the provided metadata and values.

pub fn child_of( parent: Id, metadata: &'static Metadata<'static>, values: &'a ValueSet<'a>, ) -> Attributes<'a>

Returns Attributes describing a new child span of the specified parent span, with the provided metadata and values.

pub fn metadata(&self) -> &'static Metadata<'static>

Returns a reference to the new span’s metadata.

pub fn values(&self) -> &ValueSet<'a>

Returns a reference to a ValueSet containing any values the new span was created with.

pub fn is_root(&self) -> bool

Returns true if the new span should be a root.

pub fn is_contextual(&self) -> bool

Returns true if the new span’s parent should be determined based on the current context.

If this is true and the current thread is currently inside a span, then that span should be the new span’s parent. Otherwise, if the current thread is not inside a span, then the new span will be the root of its own trace tree.

pub fn parent(&self) -> Option<&Id>

Returns the new span’s explicitly-specified parent, if there is one.

Otherwise (if the new span is a root or is a child of the current span), returns None.

pub fn record(&self, visitor: &mut dyn Visit)

Records all the fields in this set of Attributes with the provided Visitor.

pub fn contains(&self, field: &Field) -> bool

Returns true if this set of Attributes contains a value for the given Field.

pub fn is_empty(&self) -> bool

Returns true if this set of Attributes contains no values.

pub fn fields(&self) -> &FieldSet

Returns the set of all fields defined by this span’s Metadata.

Note that the FieldSet returned by this method includes all the fields declared by this span, not just those with values that are recorded as part of this set of Attributes. Other fields with values not present in this Attributes’ value set may record values later.

Trait Implementations

impl<'a> Debug for Attributes<'a>

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

Formats the value using the given formatter.