Struct tracing_subscriber::fmt::format::Json

pub struct Json { /* fields omitted */ }

This is supported on crate feature fmt only.

Marker for Format that indicates that the verbose json log format should be used.

The full format includes fields from all entered spans.

Example Output

{
    "timestamp":"Feb 20 11:28:15.096",
    "level":"INFO",
    "fields":{"message":"some message","key":"value"}
    "target":"mycrate",
    "span":{name":"leaf"},
    "spans":[{"name":"root"},{"name":"leaf"}],
}

Options

• Json::flatten_event can be used to enable flattening event fields into the root
• Json::with_current_span can be used to control logging of the current span
• Json::with_span_list can be used to control logging of the span list object.

By default, event fields are not flattened, and both current span and span list are logged.

Implementations

impl Json

pub fn flatten_event(&mut self, flatten_event: bool)

If set to true event metadata will be flattened into the root object.

pub fn with_current_span(&mut self, display_current_span: bool)

If set to false, formatted events won’t contain a field for the current span.

pub fn with_span_list(&mut self, display_span_list: bool)

If set to false, formatted events won’t contain a list of all currently entered spans. Spans are logged in a list from root to leaf.

Trait Implementations

impl Clone for Json

fn clone(&self) -> Json

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Json

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

Formats the value using the given formatter.

impl Default for Json

fn default() -> Json

Returns the “default value” for a type.

impl PartialEq<Json> for Json

fn eq(&self, other: &Json) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Json) -> bool

This method tests for !=.

impl Copy for Json

impl Eq for Json

impl StructuralEq for Json

impl StructuralPartialEq for Json