Struct OtelTracer 

pub struct OtelTracer { /* private fields */ }

A compatibility wrapper that exposes the same Tracer interface as the OpenTelemetry SDK but is implemented internally by delegating every call to a SzTracer.

What this is (and is not)

This type exists so that downstream code can be written against an “otel-style” tracer name without pulling in the real opentelemetry crate as a dependency. It is not a real OpenTelemetry implementation:

• It does not export spans to an OTLP / Jaeger / Zipkin collector.
• v0.2.2 修复 P2-2：现已实现 W3C TraceContext traceparent header 传播 （00-<trace_id>-<span_id>-<trace_flags>），同时保留 parent-span-id header 以传递父 span 关系。extract 优先解析 W3C，回退到 legacy。
• It does not perform sampling, baggage propagation, or context extraction across async boundaries.
• Span IDs are generated from std::collections::hash_map::RandomState rather than per the OpenTelemetry specification (16 hex chars / 8 bytes random).

When to use which

• Use SzTracer directly for in-process span collection and W3C TraceContext header propagation.
• Use OtelTracer when an existing code base expects a tracer whose name signals OpenTelemetry-compatibility, but you have already decided to back it with SzTracer semantics.
• For production distributed tracing across service boundaries, depend on the real opentelemetry SDK and use its Tracer implementation instead.

Both SzTracer and OtelTracer satisfy the Tracer trait, so they can be swapped at the type level without changing call sites.

Implementations

impl OtelTracer

pub fn new(service_name: impl Into<String>) -> OtelTracer

Wraps a freshly-built SzTracer tagged with service_name.

pub fn inner(&self) -> &SzTracer

Provides read access to the underlying SzTracer so callers can inspect accumulated spans or clear them between tests.

Trait Implementations

impl Tracer for OtelTracer

fn start_span(&self, operation_name: &str) -> Span

fn end_span(&self, span: Span)

fn inject(&self, span: &Span) -> HashMap<String, String>

fn extract(&self, headers: &HashMap<String, String>) -> Option<Span>