currencyservice

currency service

The currency service provides a currency conversion capabilities.

OpenTelemetry instrumentation

Initialization

The OpenTelemetry SDK is initialized in tracing.js. As part of the SDK initialization, all auto instrumentations are enabled. This is loaded as a preload module to the Node application using the -r ./tracing.js command line arguments.

"use strict";

const process = require("process");
const { NodeSDK } = require("@opentelemetry/sdk-node");
const {
  getNodeAutoInstrumentations,
} = require("@opentelemetry/auto-instrumentations-node");
const { Resource } = require("@opentelemetry/resources");
const {
  SemanticResourceAttributes,
} = require("@opentelemetry/semantic-conventions");
const {
  CollectorTraceExporter,
} = require("@opentelemetry/exporter-collector-grpc");

// Create an OpenTelemetry Collector exporter for traces
const traceExporter = new CollectorTraceExporter({
  url: process.env.OTEL_EXPORTER_OTLP_ENDPOINT,
});

// create the OpenTelemetry NodeSDK trace provider
const sdk = new NodeSDK({
  resource: new Resource({
    [SemanticResourceAttributes.SERVICE_NAME]: process.env.SERVICE_NAME,
    ["ip"]: process.env.POD_IP,
  }),
  traceExporter,
  instrumentations: [getNodeAutoInstrumentations()], // enable all Auto Instrumentations
});

// Start the OpenTelemetry tracing SDK
sdk
  .start()
  .then(() => console.log("Tracing initialized"))
  .catch((error) => console.log("Error initializing tracing", error));

// On shutdown, ensure we flush all telemetry first
process.on("SIGTERM", () => {
  sdk
    .shutdown()
    .then(() => console.log("Tracing terminated"))
    .catch((error) => console.log("Error terminating tracing", error))
    .finally(() => process.exit(0));
});

The getNodeAutoInstrumentations() meta package is used to quickly add all possible instrumentations. You can also specify specific instrumentations only if desired.