It should be possible to propagate context with only the API

[dyladan]

open-telemetry/opentelemetry-specification#719

When a span is started with a valid parent using the NoOp tracing API, the span's context should be the same as the context of the parent.

const tracer = api.trace.getTracer(name);

const parent = { traceId, spanId, traceFlags };

const span = tracer.startSpan(spanName, { parent });

assert(span.context().traceId === parent.traceId);
assert(span.context().spanId === parent.spanId);
assert(span.context().traceFlags === parent.traceFlags);

const tracer = api.trace.getTracer(name);

const parentContext = api.propagation.extract(headers);

const span = tracer.startSpan(spanName, {}, parentContext);

const parent = getExtractedSpanContext(parentContext);
assert(span.context().traceId === parent.traceId);
assert(span.context().spanId === parent.spanId);
assert(span.context().traceFlags === parent.traceFlags);

[obecny]

@vmarchaud hey, are you still working on that ?

[vmarchaud]

I mean the PR is ready here (and you already approved it): #1527

[obecny]

a yes, thx, we just need one more approve and we are good to go