nodejs

OpenTracing Tutorial - Node.js

Installing

The tutorials are using CNCF Jaeger (https://github.com/jaegertracing/jaeger) as the tracing backend, see here how to install it in a Docker image.

First clone the opentracing-tutorial, then install the dependencies:

cd opentracing-tutorial/nodejs
npm install

The rest of the commands in the Node.js tutorials should be executed relative to this nodejs directory.

Under construction

This tutorial is currently incomplete. You can try following the tutorials in the other languages and adapt them to Node.js, as all the same features are available in the OpenTracing API for Javascript (https://github.com/opentracing/opentracing-javascript). Use the following code to initialize Jaeger tracer:

var initJaegerTracer = require("jaeger-client").initTracer;

function initTracer(serviceName) {
  var config = {
    serviceName: serviceName,
    sampler: {
      type: "const",
      param: 1,
    },
    reporter: {
      logSpans: true,
    },
  };
  var options = {
    logger: {
      info: function logInfo(msg) {
        console.log("INFO ", msg);
      },
      error: function logError(msg) {
        console.log("ERROR", msg);
      },
    },
  };
  return initJaegerTracer(config, options);
}

Lessons

• Lesson 01 - Hello World
  • Instantiate a Tracer
  • Create a simple trace
  • Annotate the trace
• Lesson 02 - Context and Tracing Functions
  • Trace individual functions
  • Combine multiple spans into a single trace
  • Propagate the in-process context
• Lesson 03 - Tracing RPC Requests
  • Trace a transaction across more than one microservice
  • Pass the context between processes using Inject and Extract
  • Apply OpenTracing-recommended tags
• Lesson 04 - Baggage
  • Understand distributed context propagation
  • Use baggage to pass data through the call graph
• Extra Credit
  • Use existing open source instrumentation