OpenTelemetry Context Zone

This module provides Zone Context Manager with bundled zone-js for Web applications. If you have your own zone-js please use @opentelemetry/context-zone-peer-dep If you use Angular it means you already have the zone-js and you should use @opentelemetry/context-zone-peer-dep

Installation

npm install --save @opentelemetry/context-zone

Usage

import { context, trace } from '@opentelemetry/api';
import {
  ConsoleSpanExporter,
  SimpleSpanProcessor,
  WebTracerProvider,
} from '@opentelemetry/sdk-trace-web';
import { ZoneContextManager } from '@opentelemetry/context-zone';

const providerWithZone = new WebTracerProvider();
providerWithZone.addSpanProcessor(new SimpleSpanProcessor(new ConsoleSpanExporter()));
providerWithZone.register({
  contextManager: new ZoneContextManager()
});

// Example how the ZoneContextManager keeps the reference to the correct context during async operations
const webTracerWithZone = providerWithZone.getTracer('default');
const span1 = webTracerWithZone.startSpan('foo1');

context.with(trace.setSpan(context.active(), span1), () => {
  console.log('Current span is span1', trace.getSpan(context.active()) === span1);
  setTimeout(() => {
    const span2 = webTracerWithZone.startSpan('foo2');
    console.log('Current span is span1', trace.getSpan(context.active()) === span1);
    context.with(trace.setSpan(context.active(), span2), () => {
      console.log('Current span is span2', trace.getSpan(context.active()) === span2);
      setTimeout(() => {
        console.log('Current span is span2', trace.getSpan(context.active()) === span2);
      }, 500);
    });
    // there is a timeout which still keeps span2 active
    console.log('Current span is span2', trace.getSpan(context.active()) === span2);
  }, 500);
  console.log('Current span is span1', trace.getSpan(context.active()) === span1);
});

Useful links

• For more information on OpenTelemetry, visit: https://opentelemetry.io/
• For more about OpenTelemetry JavaScript: https://github.com/open-telemetry/opentelemetry-js
• For help or feedback on this project, join us in GitHub Discussions

License

Apache 2.0 - See LICENSE for more information.