Struct JsonStorage

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

JsonStorage will collect information about a span when it’s created (new_span handler) or when new records are attached to it (on_record handler) and store it in its extensions for future retrieval from other layers interested in formatting or further enrichment.

We are re-implementing (well, copy-pasting, apart from using an HashMap instead of a BTreeMap) JsonVisitor from tracing-subscriber given that we can’t access/insert/iterate over the underlying BTreeMap using its public API.

For spans, we also store the duration of each span with the elapsed_milliseconds key using the on_exit/on_enter handlers.

Implementations

impl<'a> JsonStorage<'a>

pub fn values(&self) -> &HashMap<&'a str, Value>

Get the set of stored values, as a set of keys and JSON values.

Trait Implementations

impl<'a> Clone for JsonStorage<'a>

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

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<'a> Debug for JsonStorage<'a>

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

Formats the value using the given formatter.

impl Default for JsonStorage<'_>

Get a new visitor, with an empty bag of key-value pairs.

fn default() -> Self

Returns the “default value” for a type.

impl Visit for JsonStorage<'_>

Taken verbatim from tracing-subscriber

fn record_i64(&mut self, field: &Field, value: i64)

Visit a signed 64-bit integer value.

fn record_u64(&mut self, field: &Field, value: u64)

Visit an unsigned 64-bit integer value.

fn record_f64(&mut self, field: &Field, value: f64)

Visit a 64-bit floating point value.

fn record_bool(&mut self, field: &Field, value: bool)

Visit a boolean value.

fn record_str(&mut self, field: &Field, value: &str)

Visit a string value.

fn record_debug(&mut self, field: &Field, value: &dyn Debug)

Visit a value implementing fmt::Debug.

fn record_i128(&mut self, field: &Field, value: i128)

Visit a signed 128-bit integer value.

fn record_u128(&mut self, field: &Field, value: u128)

Visit an unsigned 128-bit integer value.

fn record_bytes(&mut self, field: &Field, value: &[u8])

Visit a byte slice.

fn record_error(&mut self, field: &Field, value: &(dyn Error + 'static))

Records a type implementing Error.