creating-and-propagating-spans.js

/* user-simulator */

async function whereami() => {
    const span = tracer.startSpan('whereami-request')

    const location = await axios.get(`${process.env.API_SERVER_ADDRESS}/whereami`, {
        headers: getCarrier(span, tracer)
    })
        
    span.finish()       
})

function getCarrier(span, tracer) {
    const carrier = {}
    tracer.inject(span.context(), opentracing.FORMAT_HTTP_HEADERS, carrier)
    return carrier
}