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jaeger-client

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jaeger-client

Jaeger binding for OpenTracing API for Node.js

  • 3.19.0
  • latest
  • Source
  • npm
  • Socket score

Version published
Weekly downloads
363K
decreased by-34.58%
Maintainers
5
Weekly downloads
 
Created

What is jaeger-client?

The jaeger-client npm package is a Node.js client for Jaeger, an open-source, end-to-end distributed tracing system. It is used to monitor and troubleshoot microservices-based distributed systems.

What are jaeger-client's main functionalities?

Initialize Tracer

This code initializes a Jaeger tracer with a given configuration. The tracer is used to start and finish spans, which represent units of work in the system.

const initTracer = require('jaeger-client').initTracer;

const config = {
  serviceName: 'my-service',
  reporter: {
    logSpans: true,
    agentHost: 'localhost',
    agentPort: 6832,
  },
  sampler: {
    type: 'const',
    param: 1,
  },
};

const options = {
  tags: {
    'my-service.version': '1.0.0',
  },
  logger: console,
};

const tracer = initTracer(config, options);

Start and Finish a Span

This code demonstrates how to start and finish a span. Spans are used to trace the execution of operations within a service.

const span = tracer.startSpan('my-operation');

// Simulate some work
setTimeout(() => {
  span.finish();
}, 1000);

Add Tags and Logs to a Span

This code shows how to add tags and logs to a span. Tags and logs provide additional context and information about the operation being traced.

const span = tracer.startSpan('my-operation');
span.setTag('http.method', 'GET');
span.log({ event: 'request_start', message: 'Request started' });

// Simulate some work
setTimeout(() => {
  span.log({ event: 'request_end', message: 'Request ended' });
  span.finish();
}, 1000);

Inject and Extract Span Context

This code demonstrates how to inject and extract span context for distributed tracing. This allows spans to be propagated across process boundaries, enabling end-to-end tracing.

const carrier = {};
const parentSpan = tracer.startSpan('parent-operation');
tracer.inject(parentSpan, 'http_headers', carrier);

const extractedContext = tracer.extract('http_headers', carrier);
const childSpan = tracer.startSpan('child-operation', { childOf: extractedContext });

// Simulate some work
setTimeout(() => {
  childSpan.finish();
  parentSpan.finish();
}, 1000);

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Package last updated on 01 Nov 2021

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