instrumentation.node.ts

/* eslint-disable no-console */
import { diag, DiagConsoleLogger, DiagLogLevel } from "@opentelemetry/api";
import { getNodeAutoInstrumentations } from "@opentelemetry/auto-instrumentations-node";
import { OTLPMetricExporter } from "@opentelemetry/exporter-metrics-otlp-proto";
import { OTLPTraceExporter } from "@opentelemetry/exporter-trace-otlp-http";
import { Resource } from "@opentelemetry/resources";
import {
  PeriodicExportingMetricReader,
  ConsoleMetricExporter,
} from "@opentelemetry/sdk-metrics";
import { NodeSDK } from "@opentelemetry/sdk-node";
import { SimpleSpanProcessor } from "@opentelemetry/sdk-trace-node";
import { SemanticResourceAttributes } from "@opentelemetry/semantic-conventions";

diag.setLogger(new DiagConsoleLogger(), DiagLogLevel.INFO);

const traceExporter = new OTLPTraceExporter();

const sdk = new NodeSDK({
  resource: new Resource({
    [SemanticResourceAttributes.SERVICE_NAME]: "blockscout_frontend",
    [SemanticResourceAttributes.SERVICE_VERSION]:
      process.env.NEXT_PUBLIC_GIT_TAG ||
      process.env.NEXT_PUBLIC_GIT_COMMIT_SHA ||
      "unknown_version",
    [SemanticResourceAttributes.SERVICE_INSTANCE_ID]:
      process.env.NEXT_PUBLIC_APP_INSTANCE ||
      process.env.NEXT_PUBLIC_APP_HOST?.replace(
        ".blockscout.com",
        ""
      ).replaceAll("-", "_") ||
      "unknown_app",
  }),
  spanProcessor: new SimpleSpanProcessor(traceExporter),
  traceExporter,
  metricReader: new PeriodicExportingMetricReader({
    exporter:
      process.env.NODE_ENV === "production"
        ? new OTLPMetricExporter()
        : new ConsoleMetricExporter(),
  }),
  instrumentations: [
    getNodeAutoInstrumentations({
      "@opentelemetry/instrumentation-http": {
        ignoreIncomingRequestHook: (request) => {
          try {
            if (!request.url) {
              return false;
            }
            const url = new URL(request.url, `http://${request.headers.host}`);
            if (
              url.pathname.startsWith("/_next/static/") ||
              url.pathname.startsWith("/_next/data/") ||
              url.pathname.startsWith("/assets/") ||
              url.pathname.startsWith("/static/") ||
              url.pathname.startsWith("/favicon/") ||
              url.pathname.startsWith("/envs.js")
            ) {
              return true;
            }
          } catch (error) {}
          return false;
        },
      },
    }),
  ],
});

if (process.env.OTEL_SDK_ENABLED) {
  sdk.start();

  process.on("SIGTERM", () => {
    sdk
      .shutdown()
      .then(() => console.log("Tracing terminated"))
      .catch((error) => console.log("Error terminating tracing", error))
      .finally(() => process.exit(0));
  });
}