tests: avoid test crash getting @elastic/elasticsearch version (#2351)

The tests were using `require('@elastic/elasticsearch/package.json')`
which runs afoul of EOL'd folder mappings in "exports"
(https://nodejs.org/api/all.html#DEP0148) with current ES client
versions and the latest node v17 nightly.

Fixes: #2350

package.json

@@ -162,6 +162,7 @@
     "memcached": "^2.2.2",
     "mimic-response": "^2.1.0",
     "mkdirp": "^0.5.1",
+    "module-details-from-path": "^1.0.3",
     "mongodb": "^4.1.0",
     "mongodb-core": "^3.2.7",
     "mysql": "^2.18.1",

test/_utils.js

@@ -1,5 +1,9 @@
 'use strict'
 
+const fs = require('fs')
+
+const moduleDetailsFromPath = require('module-details-from-path')
+
 // Lookup the property "str" (given in dot-notation) in the object "obj".
 // If the property isn't found, then `undefined` is returned.
 function dottedLookup (obj, str) {
@@ -30,7 +34,36 @@ function findObjInArray (arr, key, val) {
   return result
 }
 
+// "Safely" get the version of the given package, if possible. Otherwise return
+// null.
+//
+// Here "safely" means avoiding `require("$packageName/package.json")` because
+// that can fail if the package uses an old form of "exports"
+// (e.g. https://github.com/elastic/apm-agent-nodejs/issues/2350).
+function safeGetPackageVersion (packageName) {
+  let file
+  try {
+    file = require.resolve(packageName)
+  } catch (_err) {
+    return null
+  }
+
+  // Use the same logic as require-in-the-middle for finding the 'basedir' of
+  // the package from `file`.
+  const details = moduleDetailsFromPath(file)
+  if (!details) {
+    return null
+  }
+
+  try {
+    return JSON.parse(fs.readFileSync(details.basedir + '/package.json')).version
+  } catch (_err) {
+    return null
+  }
+}
+
 module.exports = {
   dottedLookup,
-  findObjInArray
+  findObjInArray,
+  safeGetPackageVersion
 }

test/config.test.js

@@ -17,6 +17,7 @@ var test = require('tape')
 const Agent = require('../lib/agent')
 const { MockAPMServer } = require('./_mock_apm_server')
 const { NoopTransport } = require('../lib/noop-transport')
+const { safeGetPackageVersion } = require('./_utils')
 var config = require('../lib/config')
 var Instrumentation = require('../lib/instrumentation')
 var apmVersion = require('../package').version
@@ -860,7 +861,7 @@ usePathAsTransactionNameTests.forEach(function (usePathAsTransactionNameTest) {
 
 test('disableInstrumentations', function (t) {
   var expressGraphqlVersion = require('express-graphql/package.json').version
-  var esVersion = require('@elastic/elasticsearch/package.json').version
+  var esVersion = safeGetPackageVersion('@elastic/elasticsearch')
 
   // require('apollo-server-core') is a hard crash on nodes < 12.0.0
   const apolloServerCoreVersion = require('apollo-server-core/package.json').version

test/instrumentation/modules/@elastic/elasticsearch.test.js

@@ -10,9 +10,11 @@ const agent = require('../../../..').start({
   spanFramesMinDuration: -1 // always capture stack traces with spans
 })
 
+const { safeGetPackageVersion } = require('../../../_utils')
+
 // Skip (exit the process) if this package version doesn't support this version
 // of node.
-const esVersion = require('@elastic/elasticsearch/package.json').version
+const esVersion = safeGetPackageVersion('@elastic/elasticsearch')
 const semver = require('semver')
 if (semver.lt(process.version, '10.0.0') && semver.gte(esVersion, '7.12.0')) {
   console.log(`# SKIP @elastic/elasticsearch@${esVersion} does not support node ${process.version}`)
@@ -34,7 +36,6 @@ const { MockES } = require('./_mock_es')
 
 const host = (process.env.ES_HOST || 'localhost') + ':9200'
 const node = 'http://' + host
-const pkgVersion = require('@elastic/elasticsearch/package.json').version
 
 test('client.ping with promise', function (t) {
   resetAgent(checkDataAndEnd(t, 'HEAD', '/', null))
@@ -334,7 +335,7 @@ test('DeserializationError', function (t) {
   })
 })
 
-if (semver.gte(pkgVersion, '7.14.0')) {
+if (semver.gte(esVersion, '7.14.0')) {
   test('ProductNotSupportedError', function (t) {
     // Create a mock Elasticsearch server that responds to "GET /" with a body
     // that triggers ProductNotSupportedError.
@@ -377,7 +378,7 @@ if (semver.gte(pkgVersion, '7.14.0')) {
   })
 }
 
-if (semver.gte(pkgVersion, '7.7.0')) {
+if (semver.gte(esVersion, '7.7.0')) {
   // Abort handling was added to @elastic/[email protected].
 
   test('request.abort() works', function (t) {