Struct Context

pub struct Context {
    pub trace_id: TraceId,
    pub span_id: SpanId,
    pub parent_id: Option<SpanId>,
}

A context for tracing the execution of processes, distributed or otherwise.

Consists of a span identifying an event, an optional parent span identifying a causal event that triggered the current span, and a trace with which all related spans are associated.

Fields

trace_id: TraceId

An identifier of the trace associated with the current context. A trace ID is typically created at a root span and passed along through all causal events.

span_id: SpanId

An identifier of the current span. In typical RPC usage, a span is created by a client before making an RPC, and the span ID is sent to the server. The server is free to create its own spans, for which it sets the client’s span as the parent span.

parent_id: Option<SpanId>

An identifier of the span that originated the current span. For example, if a server sends an RPC in response to a client request that included a span, the server would create a span for the RPC and set its parent to the span_id in the incoming request’s context.

If parent_id is None, then this is a root context.

Implementations

impl Context

pub fn new_root() -> Self

Constructs a new root context. A root context is one with no parent span.

Trait Implementations

impl Clone for Context

fn clone(&self) -> Context

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Context

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

Formats the value using the given formatter.

impl Default for Context

fn default() -> Context

Returns the “default value” for a type.

impl Hash for Context

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Context

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for Context

impl Eq for Context

impl StructuralPartialEq for Context