OpenTelemetry support propagation of trace

[darren-west]

Description

I would like to have the ability to propagate a trace to another service. I am unable to find a way to propogate the trace as the opentelemetry context is not set

Ideally I would use something simple like opentelemetry.propagation.inject(api.context.active(), extensions); but because the context is not set anywhere this will not work.

I have looked at implementing this as part of the plugin but cant see an obvious way as normally you would call something like:

          opentelemetry.context.with(ctx, () => {
            // wrapped function
          })

See

But I don't think you can wrap another plugin as they are called one after another and seems its not achievable in envelope unless I am missing something.

An alternative approach

We could set the active context for opentelemetry into the graphql context and allow it to be accessed that way. e.g. adding a field

context[activeContext] = opentelemetry.trace.setSpan(opentelemetry.context.active(), context[tracingSpanSymbol]);

Then provide a getter from the opentelemetry package.