jaeger.ts

import { ExpressInstrumentation } from "@opentelemetry/instrumentation-express";
import { HttpInstrumentation } from "@opentelemetry/instrumentation-http";
import { BatchSpanProcessor } from "@opentelemetry/sdk-trace-base";
import { PrismaInstrumentation } from "@prisma/instrumentation";
import { SemanticResourceAttributes } from "@opentelemetry/semantic-conventions";
import { NodeTracerProvider } from "@opentelemetry/sdk-trace-node";
import { Resource } from "@opentelemetry/resources";
import { JaegerExporter } from "@opentelemetry/exporter-jaeger";
import { Logger } from "@api/services/LoggerService";
import { registerInstrumentations } from "@opentelemetry/instrumentation";

/**
 * Jaeger UI: http://localhost:16686/
 * How to setup Docker: https://www.jaegertracing.io/docs/1.6/getting-started/
 * This file configures Prisma, Express & HTTP tracing
 */

// eslint-disable-next-line import/prefer-default-export
export const initJaegerTracing = () => {
  const jaegerExporter = new JaegerExporter({
    // host: 'localhost', // optional
    // port: 6832, // optional
    // OR you can use the HTTPSender as follows
    /* The endpoint for the jaeger-agent. */
    endpoint: process.env.JAEGER_URL || "http://localhost:14268/api/traces",
    maxPacketSize: 65000, // optional
  });

  const provider: NodeTracerProvider = new NodeTracerProvider({
    resource: new Resource({
      [SemanticResourceAttributes.SERVICE_NAME]: "carhuna-api",
    }),
  });

  provider.addSpanProcessor(new BatchSpanProcessor(jaegerExporter));

  registerInstrumentations({
    tracerProvider: provider,
    instrumentations: [
      new HttpInstrumentation(),
      new ExpressInstrumentation(),
      new PrismaInstrumentation(),
    ],
  });

  provider.register();

  Logger.verbose("Jaeger tracing running");
};