TypeError: plugin._tracer.getCurrentSpan is not a function

[eduardoroliveira]

I am trying the example provided at https://github.com/open-telemetry/opentelemetry-js/tree/main/getting-started, but I am getting the following error. Any idea what is going on?

Listening for requests on http://localhost:8080
TypeError: plugin._tracer.getCurrentSpan is not a function
    at /Users/edeoliveira/Documents/projects/telemetry/opentelemetry-js/getting-started/example/node_modules/@opentelemetry/plugin-express/build/src/express.js:129:36
    at Layer.handle [as handle_request] (/Users/edeoliveira/Documents/projects/telemetry/opentelemetry-js/getting-started/example/node_modules/express/lib/router/layer.js:95:5)
    at trim_prefix (/Users/edeoliveira/Documents/projects/telemetry/opentelemetry-js/getting-started/example/node_modules/express/lib/router/index.js:317:13)
    at /Users/edeoliveira/Documents/projects/telemetry/opentelemetry-js/getting-started/example/node_modules/express/lib/router/index.js:284:7
    at Function.process_params (/Users/edeoliveira/Documents/projects/telemetry/opentelemetry-js/getting-started/example/node_modules/express/lib/router/index.js:335:12)
    at next (/Users/edeoliveira/Documents/projects/telemetry/opentelemetry-js/getting-started/example/node_modules/express/lib/router/index.js:275:10)
    at Function.handle (/Users/edeoliveira/Documents/projects/telemetry/opentelemetry-js/getting-started/example/node_modules/express/lib/router/index.js:174:3)
    at Function.handle (/Users/edeoliveira/Documents/projects/telemetry/opentelemetry-js/getting-started/example/node_modules/express/lib/application.js:174:10)
    at Server.app (/Users/edeoliveira/Documents/projects/telemetry/opentelemetry-js/getting-started/example/node_modules/express/lib/express.js:39:9)
    at Server.emit (events.js:315:20)

This is how the package.json looks like:

{
  "name": "@opentelemetry/getting-started-example",
  "version": "0.15.0",
  "description": "This repository provides everything required to follow the OpenTelemetry Getting Started Guide",
  "main": "app.js",
  "scripts": {
    "start": "node app.js"
  },
  "author": "OpenTelemetry Authors",
  "license": "Apache-2.0",
  "dependencies": {
    "@opentelemetry/core": "^0.15.0",
    "@opentelemetry/exporter-zipkin": "^0.15.0",
    "@opentelemetry/node": "^0.15.0",
    "@opentelemetry/plugin-express": "^0.12.1",
    "@opentelemetry/plugin-http": "^0.15.0",
    "@opentelemetry/plugin-https": "^0.15.0",
    "@opentelemetry/tracing": "^0.15.0",
    "axios": "^0.21.0",
    "express": "^4.17.1"
  }
}

tracing.js

"use strict";

const { LogLevel } = require("@opentelemetry/core");
const { NodeTracerProvider } = require("@opentelemetry/node");
const { SimpleSpanProcessor } = require("@opentelemetry/tracing");
const { ZipkinExporter } = require("@opentelemetry/exporter-zipkin");

const provider = new NodeTracerProvider({
  logLevel: LogLevel.ERROR,
});

provider.register();

provider.addSpanProcessor(
  new SimpleSpanProcessor(
    new ZipkinExporter({
      serviceName: "getting-started",
      // If you are running your tracing backend on another host,
      // you can point to it using the `url` parameter of the
      // exporter config.
    })
  )
);

provider.getCurrentSpan = () => {
  return this.activeSpamProcessor.MultiSpanProcessor._spanProcessors[0][0];
};

// provider.getTracer()
// console.log("PROVIDER", provider);
console.log("tracing initialized");

app.js

"use strict";

const PORT = process.env.PORT || "8080";

const express = require("express");
const axios = require("axios");

const app = express();

app.get("/", (req, res) => {
  axios
    .get(`http://localhost:${PORT}/middle-tier`)
    .then(() => axios.get(`http://localhost:${PORT}/middle-tier`))
    .then(result => {
      res.send(result.data);
    })
    .catch(err => {
      console.error(err);
      res.status(500).send();
    });
});

app.get("/middle-tier", (req, res) => {
  axios
    .get(`http://localhost:${PORT}/backend`)
    .then(() => axios.get(`http://localhost:${PORT}/backend`))
    .then(result => {
      res.send(result.data);
    })
    .catch(err => {
      console.error(err);
      res.status(500).send();
    });
});

app.get("/backend", (req, res) => {
  res.send("Hello from the backend");
});

app.listen(parseInt(PORT, 10), () => {
  console.log(`Listening for requests on http://localhost:${PORT}`);
});

[obecny]

plugins in contrib are not yet compatible with version 0.15 of core. Please wait until new release, until then you can use version 0.14.x of core

[eduardoroliveira]

Hi @obecny,

Thanks for your help!

Maybe that could be a good idea to change the doc https://github.com/open-telemetry/opentelemetry-js/tree/main/getting-started to

$ npm install \
  @opentelemetry/core@">=0.14.0 <0.15.0" \
  @opentelemetry/node \
  @opentelemetry/plugin-http \
  @opentelemetry/plugin-https \
  @opentelemetry/plugin-express