getSpan does not return the span in the active context

[altairmn]

Hey guys, I have the following code, and I'm unsure why the active span is not returned.

import { trace, context } from "@opentelemetry/api"

const tracer = trace.getTracer(name, version);

// Using this method to wrap.
function wrapper(name: string, fn: (...args) => any) : (...args) => any {
    return async (...args) => {
        const span = tracer.startSpan(name)
        const ctx = trace.setSpan(context.active(), span);
        const ret =  await context.with(ctx, fn, undefined, ...args);
        span.end();
        return ret 
    };
}

app.on('message', wrapper('on_message', async (msg) => {
  console.log(tracer.getSpan(context.active()) // HERE: prints undefined
}));

Q. Even though I set the span on the root context, when I try retrieving it in the wrapped method, it returns an undefined span. Is it because the callback is async? I've tried with non-async callback as well and have received the same output.

[Flarna]

There is no SDK installed and as a result no real ContextManager. The ContextManager included in the API is a Noop.

see also open-telemetry/opentelemetry-js-api#23

[altairmn]

So I didn't put the whole code here. I had added the SDK, but I realized that I didn't add and enable a context manager. So after making those changes, I was able to see the events.