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() feature is used to quickly add all possible instrumentations. You can also specify specific instrumentations only if desired.