[dash0] frontend: convert k8s resource detector from ts to js

The resource detectors are configured in a file loaded via a
--require hook (in utils/telemetry/Instrumentation.js), which needs
to be pure JS.

.github/actions/update-env-file/action.yaml

@@ -33,4 +33,3 @@ runs:
         git commit -a -m"[dash0] update image version in .env to ${{ inputs.containerImageVersion }}" -m"[ci skip]"
         git status
         git push
-

.licenserc.json

@@ -44,6 +44,8 @@
         "src/checkoutservice/genproto/",
         "src/featureflagservice/assets/vendor/",
         "src/featureflagservice/priv/",
+        "src/frontend/utils/telemetry/KubernetesResourceDetector.js",
+        "src/frontend/utils/telemetry/KubernetesResourceDetector.test.js",
         "src/productcatalogservice/genproto/",
         "internal/tools/",
         ".github/actions/",

src/frontend/Dockerfile

@@ -31,7 +31,7 @@ RUN adduser -S nextjs -u 1001
 
 COPY --from=builder /app/next.config.js ./
 COPY --from=builder /app/utils/telemetry/Instrumentation.js ./
-COPY --from=builder /app/utils/telemetry/KubernetesResourceDetector.ts ./
+COPY --from=builder /app/utils/telemetry/KubernetesResourceDetector.js ./
 COPY --from=builder /app/public ./public
 COPY --from=builder /app/package.json ./package.json
 COPY --from=deps /app/node_modules ./node_modules

src/frontend/jest.config.ts

@@ -1,12 +1,9 @@
-/**
- * For a detailed explanation regarding each configuration property, visit:
- * https://jestjs.io/docs/configuration
- */
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
 
 import type { Config } from 'jest';
 
 const config: Config = {
-  preset: 'ts-jest',
   testEnvironment: 'node',
   clearMocks: true,
   coverageProvider: 'v8',

src/frontend/package.json

@@ -63,8 +63,6 @@
     "jest": "^29.7.0",
     "mock-fs": "^5.2.0",
     "openapi-typescript": "6.7.1",
-    "ts-jest": "^29.1.2",
-    "ts-node": "^10.9.2",
     "typescript": "5.2.2"
   }
 }

src/frontend/utils/telemetry/KubernetesResourceDetector.ts → src/frontend/utils/telemetry/KubernetesResourceDetector.js

@@ -1,13 +1,13 @@
 /* eslint-disable @typescript-eslint/no-unused-vars */
-import { readFile } from 'fs/promises';
-import { Detector, Resource, ResourceDetectionConfig } from '@opentelemetry/resources';
-import { SemanticResourceAttributes } from '@opentelemetry/semantic-conventions';
+const { readFile } = require('fs/promises');
+const { Detector, Resource, ResourceDetectionConfig } = require('@opentelemetry/resources');
+const { SemanticResourceAttributes } = require('@opentelemetry/semantic-conventions');
 
 const POD_ID_LENGTH = 36;
 const CONTAINER_ID_LENGTH = 64;
 
-export class KubernetesResourceDetector implements Detector {
-  async detect(_config?: ResourceDetectionConfig): Promise<Resource> {
+class KubernetesResourceDetector {
+  async detect(_config) {
     try {
       const hostFileContent = await readFile('/etc/hosts', {
         encoding: 'utf8',
@@ -27,7 +27,7 @@ export class KubernetesResourceDetector implements Detector {
       return Resource.EMPTY;
     }
 
-    let podUid: string | null | undefined = null;
+    let podUid = null;
     try {
       podUid = await readPodUidCgroupsV1();
     } catch (err) {
@@ -49,7 +49,7 @@ export class KubernetesResourceDetector implements Detector {
   }
 }
 
-const readPodUidCgroupsV1 = async (): Promise<string> => {
+async function readPodUidCgroupsV1() {
   const mountinfo = await readFile('/proc/self/mountinfo', {
     encoding: 'utf8',
   });
@@ -66,9 +66,9 @@ const readPodUidCgroupsV1 = async (): Promise<string> => {
   }
 
   return podMountInfoEntry.split('/pods/')[1].substring(0, POD_ID_LENGTH);
-};
+}
 
-const readPodUidCgroupsV2 = async (): Promise<string | null | undefined> => {
+async function readPodUidCgroupsV2() {
   const cgroups = await readFile('/proc/self/cgroup', {
     encoding: 'utf8',
   });
@@ -94,4 +94,6 @@ const readPodUidCgroupsV2 = async (): Promise<string | null | undefined> => {
       return segments[segments.length - 2];
     })
     .find(podUid => !!podUid);
-};
+}
+
+module.exports = KubernetesResourceDetector;

src/frontend/utils/telemetry/KubernetesResourceDetector.test.ts → src/frontend/utils/telemetry/KubernetesResourceDetector.test.js

@@ -1,14 +1,14 @@
-import { KubernetesResourceDetector } from './KubernetesResourceDetector';
-import { SemanticResourceAttributes } from '@opentelemetry/semantic-conventions';
-import {expect, jest, test} from '@jest/globals';
-import mock from 'mock-fs';
+const KubernetesResourceDetector = require('./KubernetesResourceDetector');
+const { SemanticResourceAttributes } = require('@opentelemetry/semantic-conventions');
+const { expect, test } = require('@jest/globals');
+const mock = require('mock-fs');
 
 const K8S_POD_ID = '6189e731-8c9a-4c3a-ba6f-9796664788a8';
 
-const trimMultiline = (s: string) =>
+const trimMultiline = s =>
   s
     .split('\n')
-    .map((s) => s.trim())
+    .map(s => s.trim())
     .join('\n');
 
 describe('KubernetesResourceDetector', () => {