const opentelemetry = require('@opentelemetry/core');

const { BasicTracer, SimpleSpanProcessor } = require('@opentelemetry/tracing');

const { JaegerExporter } = require('@opentelemetry/exporter-jaeger');

const { ZipkinExporter } = require('@opentelemetry/exporter-zipkin');

const { CollectorExporter } = require('@opentelemetry/exporter-collector');

const options = {

serviceName: 'basic-service'

};

// Initialize an exporter depending on how we were started

let exporter;

const EXPORTER = process.env.EXPORTER || '';

if (EXPORTER.toLowerCase().startsWith('z')) {

exporter = new ZipkinExporter(options);

} else if (EXPORTER.toLowerCase().startsWith('j')) {

exporter = new JaegerExporter(options);

} else {

exporter = new CollectorExporter(options);

}

const tracer = new BasicTracer();

// Configure span processor to send spans to the provided exporter

tracer.addSpanProcessor(new SimpleSpanProcessor(exporter));

// Initialize the OpenTelemetry APIs to use the BasicTracer bindings

opentelemetry.initGlobalTracer(tracer);

// Create a span. A span must be closed.

const span = opentelemetry.getTracer().startSpan('main');

for (let i = 0; i < 10; i++) {

doWork(span);

}

// Be sure to end the span.

span.end();

// flush and close the connection.

exporter.shutdown();

function doWork(parent) {

}