Testing tedious limit

[alrosot]

This is a spin-off of #27

The build there is breaking for unrelated changes (it started to fail in Jan 2021).

From my investigation it seems we were fine with Tedious up to version 9.2.3 (https://app.circleci.com/pipelines/github/lightstep/ls-trace-js/441/workflows/8063a754-795a-456f-b198-7225588a9964/jobs/25879) but then version 11.0.1 broke it (https://app.circleci.com/pipelines/github/lightstep/ls-trace-js/442/workflows/4556edc7-3195-4beb-8c2b-0a5f77182349/jobs/25926/steps)

[alrosot]

Hello dear reviewers 👋
@mwear
@obecny
@codeboten
@tedpennings

Would you have a minute to take a look at this PR? Or maybe #27 ?

[mwear]

👋 @alrosot We appreciate your efforts to keep this library up to date, but we are in the process of deprecating support for the ls-trace libraries and are encouraging people to use OpenTelemetry in their place. If you have any concerns about migrating to OpenTelemetry, our product team would be happy to chat and better understand your situation. Let me know if you want to set that up

[alrosot]

Hi @mwear 👋
Sure. I'm more than happy to port over. I'm trying it already.
And since you offered help, I'd really appreciate that.

I have to get access to B3 headers generated by the lib, and in ls-trace-js I was doing something like:

const ls = require('ls-trace').init({experimental: {b3: true}});
(...)
ls.scope().active().context()._traceId.toString('hex')

According to the docs, I understood the equivalent in OpenTelemetry would be:

const api = require('@opentelemetry/api');
const { B3Propagator, B3InjectEncoding } = require('@opentelemetry/propagator-b3');
api.propagation.setGlobalPropagator(
    new B3Propagator({ injectEncoding: B3InjectEncoding.MULTI_HEADER })
);
(...)
api.getSpan(api.context.active())

But I don't see the headers being generated and api.getSpan is not a function.
Am I properly porting the code?
Thank you!