opentelemetry-js/examples/basic-tracer-node/index.js

57 lines
1.8 KiB
JavaScript

'use strict';
const opentelemetry = require('@opentelemetry/api');
const { BasicTracerProvider, ConsoleSpanExporter, SimpleSpanProcessor } = require('@opentelemetry/tracing');
const { JaegerExporter } = require('@opentelemetry/exporter-jaeger');
const provider = new BasicTracerProvider();
// Configure span processor to send spans to the exporter
const exporter = new JaegerExporter({ serviceName: 'basic-service' });
provider.addSpanProcessor(new SimpleSpanProcessor(exporter));
provider.addSpanProcessor(new SimpleSpanProcessor(new ConsoleSpanExporter()));
/**
* Initialize the OpenTelemetry APIs to use the BasicTracerProvider bindings.
*
* This registers the tracer provider with the OpenTelemetry API as the global
* tracer provider. This means when you call API methods like
* `opentelemetry.trace.getTracer`, they will use this tracer provider. If you
* do not register a global tracer provider, instrumentation which calls these
* methods will receive no-op implementations.
*/
provider.register();
const tracer = opentelemetry.trace.getTracer('example-basic-tracer-node');
// Create a span. A span must be closed.
const parentSpan = tracer.startSpan('main');
for (let i = 0; i < 10; i += 1) {
doWork(parentSpan);
}
// Be sure to end the span.
parentSpan.end();
// flush and close the connection.
exporter.shutdown();
function doWork(parent) {
// Start another span. In this example, the main method already started a
// span, so that'll be the parent span, and this will be a child span.
const span = tracer.startSpan('doWork', {
parent,
});
// simulate some random work.
for (let i = 0; i <= Math.floor(Math.random() * 40000000); i += 1) {
// empty
}
// Set attributes to the span.
span.setAttribute('key', 'value');
// Annotate our span to capture metadata about our operation
span.addEvent('invoking doWork');
span.end();
}