Add support for Azure App Services tags in profiler

packages/dd-trace/src/azure_metadata.js

@@ -0,0 +1,120 @@
+'use strict'
+
+// eslint-disable-next-line max-len
+// Modeled after https://github.com/DataDog/libdatadog/blob/f3994857a59bb5679a65967138c5a3aec418a65f/ddcommon/src/azure_app_services.rs
+
+const os = require('os')
+const { getIsAzureFunction } = require('./serverless')
+
+function extractSubscriptionID (ownerName) {
+  if (ownerName !== undefined) {
+    const subId = ownerName.split('+')[0].trim()
+    if (subId.length > 0) {
+      return subId
+    }
+  }
+  return undefined
+}
+
+function extractResourceGroup (ownerName) {
+  return /.+\+(.+)-.+webspace(-Linux)?/.exec(ownerName)?.[1]
+}
+
+function buildResourceID (subscriptionID, siteName, resourceGroup) {
+  if (subscriptionID === undefined || siteName === undefined || resourceGroup === undefined) {
+    return undefined
+  }
+  return `/subscriptions/${subscriptionID}/resourcegroups/${resourceGroup}/providers/microsoft.web/sites/${siteName}`
+    .toLowerCase()
+}
+
+function trimObject (obj) {
+  Object.entries(obj)
+    .filter(([_, value]) => value === undefined)
+    .forEach(([key, _]) => { delete obj[key] })
+  return obj
+}
+
+function buildMetadata () {
+  const {
+    COMPUTERNAME,
+    DD_AAS_DOTNET_EXTENSION_VERSION,
+    FUNCTIONS_EXTENSION_VERSION,
+    FUNCTIONS_WORKER_RUNTIME,
+    FUNCTIONS_WORKER_RUNTIME_VERSION,
+    WEBSITE_INSTANCE_ID,
+    WEBSITE_OWNER_NAME,
+    WEBSITE_OS,
+    WEBSITE_RESOURCE_GROUP,
+    WEBSITE_SITE_NAME
+  } = process.env
+
+  const subscriptionID = extractSubscriptionID(WEBSITE_OWNER_NAME)
+
+  const siteName = WEBSITE_SITE_NAME
+
+  const [siteKind, siteType] = getIsAzureFunction()
+    ? ['functionapp', 'function']
+    : ['app', 'app']
+
+  const resourceGroup = WEBSITE_RESOURCE_GROUP ?? extractResourceGroup(WEBSITE_OWNER_NAME)
+
+  return trimObject({
+    extensionVersion: DD_AAS_DOTNET_EXTENSION_VERSION,
+    functionRuntimeVersion: FUNCTIONS_EXTENSION_VERSION,
+    instanceID: WEBSITE_INSTANCE_ID,
+    instanceName: COMPUTERNAME,
+    operatingSystem: WEBSITE_OS ?? os.platform(),
+    resourceGroup,
+    resourceID: buildResourceID(subscriptionID, siteName, resourceGroup),
+    runtime: FUNCTIONS_WORKER_RUNTIME,
+    runtimeVersion: FUNCTIONS_WORKER_RUNTIME_VERSION,
+    siteKind,
+    siteName,
+    siteType,
+    subscriptionID
+  })
+}
+
+function getAzureAppMetadata () {
+  // DD_AZURE_APP_SERVICES is an environment variable introduced by the .NET APM team and is set automatically for
+  // anyone using the Datadog APM Extensions (.NET, Java, or Node) for Windows Azure App Services
+  // eslint-disable-next-line max-len
+  // See: https://github.com/DataDog/datadog-aas-extension/blob/01f94b5c28b7fa7a9ab264ca28bd4e03be603900/node/src/applicationHost.xdt#L20-L21
+  return process.env.DD_AZURE_APP_SERVICES !== undefined ? buildMetadata() : undefined
+}
+
+function getAzureFunctionMetadata () {
+  return getIsAzureFunction() ? buildMetadata() : undefined
+}
+
+// eslint-disable-next-line max-len
+// Modeled after https://github.com/DataDog/libdatadog/blob/92272e90a7919f07178f3246ef8f82295513cfed/profiling/src/exporter/mod.rs#L187
+// eslint-disable-next-line max-len
+// and https://github.com/DataDog/libdatadog/blob/f3994857a59bb5679a65967138c5a3aec418a65f/trace-utils/src/trace_utils.rs#L533
+function getAzureTagsFromMetadata (metadata) {
+  if (metadata === undefined) {
+    return {}
+  }
+  return trimObject({
+    'aas.environment.extension_version': metadata.extensionVersion,
+    'aas.environment.function_runtime': metadata.functionRuntimeVersion,
+    'aas.environment.instance_id': metadata.instanceID,
+    'aas.environment.instance_name': metadata.instanceName,
+    'aas.environment.os': metadata.operatingSystem,
+    'aas.environment.runtime': metadata.runtime,
+    'aas.environment.runtime_version': metadata.runtimeVersion,
+    'aas.resource.group': metadata.resourceGroup,
+    'aas.resource.id': metadata.resourceID,
+    'aas.site.kind': metadata.siteKind,
+    'aas.site.name': metadata.siteName,
+    'aas.site.type': metadata.siteType,
+    'aas.subscription.id': metadata.subscriptionID
+  })
+}
+
+module.exports = {
+  getAzureAppMetadata,
+  getAzureFunctionMetadata,
+  getAzureTagsFromMetadata
+}

packages/dd-trace/src/profiling/config.js

@@ -14,6 +14,7 @@ const { oomExportStrategies, snapshotKinds } = require('./constants')
 const { GIT_REPOSITORY_URL, GIT_COMMIT_SHA } = require('../plugins/util/tags')
 const { tagger } = require('./tagger')
 const { isFalse, isTrue } = require('../util')
+const { getAzureTagsFromMetadata, getAzureAppMetadata } = require('../azure_metadata')
 
 class Config {
   constructor (options = {}) {
@@ -71,7 +72,8 @@ class Config {
     this.tags = Object.assign(
       tagger.parse(DD_TAGS),
       tagger.parse(options.tags),
-      tagger.parse({ env, host, service, version, functionname })
+      tagger.parse({ env, host, service, version, functionname }),
+      getAzureTagsFromMetadata(getAzureAppMetadata())
     )
 
     // Add source code integration tags if available

packages/dd-trace/test/azure_metadata.spec.js

@@ -0,0 +1,109 @@
+'use strict'
+
+require('./setup/tap')
+
+const os = require('os')
+const { getAzureAppMetadata, getAzureTagsFromMetadata } = require('../src/azure_metadata')
+
+describe('Azure metadata', () => {
+  describe('for apps is', () => {
+    it('not provided without DD_AZURE_APP_SERVICES', () => {
+      delete process.env.DD_AZURE_APP_SERVICES
+      expect(getAzureAppMetadata()).to.be.undefined
+    })
+
+    it('provided with DD_AZURE_APP_SERVICES', () => {
+      delete process.env.COMPUTERNAME // actually defined on Windows
+      process.env.DD_AZURE_APP_SERVICES = '1'
+      delete process.env.WEBSITE_SITE_NAME
+      expect(getAzureAppMetadata()).to.deep.equal({ operatingSystem: os.platform(), siteKind: 'app', siteType: 'app' })
+    })
+  })
+
+  it('provided completely with minimum vars', () => {
+    delete process.env.WEBSITE_RESOURCE_GROUP
+    delete process.env.WEBSITE_OS
+    delete process.env.FUNCTIONS_EXTENSION_VERSION
+    delete process.env.FUNCTIONS_WORKER_RUNTIME
+    delete process.env.FUNCTIONS_WORKER_RUNTIME_VERSION
+    process.env.COMPUTERNAME = 'boaty_mcboatface'
+    process.env.DD_AZURE_APP_SERVICES = '1'
+    process.env.WEBSITE_SITE_NAME = 'website_name'
+    process.env.WEBSITE_OWNER_NAME = 'subscription_id+resource_group-regionwebspace'
+    process.env.WEBSITE_INSTANCE_ID = 'instance_id'
+    process.env.DD_AAS_DOTNET_EXTENSION_VERSION = '1.0'
+    const expected = {
+      extensionVersion: '1.0',
+      instanceID: 'instance_id',
+      instanceName: 'boaty_mcboatface',
+      operatingSystem: os.platform(),
+      resourceGroup: 'resource_group',
+      resourceID:
+        '/subscriptions/subscription_id/resourcegroups/resource_group/providers/microsoft.web/sites/website_name',
+      siteKind: 'app',
+      siteName: 'website_name',
+      siteType: 'app',
+      subscriptionID: 'subscription_id'
+    }
+    expect(getAzureAppMetadata()).to.deep.equal(expected)
+  })
+
+  it('provided completely with complete vars', () => {
+    process.env.COMPUTERNAME = 'boaty_mcboatface'
+    process.env.DD_AZURE_APP_SERVICES = '1'
+    process.env.WEBSITE_SITE_NAME = 'website_name'
+    process.env.WEBSITE_RESOURCE_GROUP = 'resource_group'
+    process.env.WEBSITE_OWNER_NAME = 'subscription_id+foo-regionwebspace'
+    process.env.WEBSITE_OS = 'windows'
+    process.env.WEBSITE_INSTANCE_ID = 'instance_id'
+    process.env.FUNCTIONS_EXTENSION_VERSION = '20'
+    process.env.FUNCTIONS_WORKER_RUNTIME = 'node'
+    process.env.FUNCTIONS_WORKER_RUNTIME_VERSION = '14'
+    process.env.DD_AAS_DOTNET_EXTENSION_VERSION = '1.0'
+    const expected = {
+      extensionVersion: '1.0',
+      functionRuntimeVersion: '20',
+      instanceID: 'instance_id',
+      instanceName: 'boaty_mcboatface',
+      operatingSystem: 'windows',
+      resourceGroup: 'resource_group',
+      resourceID:
+        '/subscriptions/subscription_id/resourcegroups/resource_group/providers/microsoft.web/sites/website_name',
+      runtime: 'node',
+      runtimeVersion: '14',
+      siteKind: 'functionapp',
+      siteName: 'website_name',
+      siteType: 'function',
+      subscriptionID: 'subscription_id'
+    }
+    expect(getAzureAppMetadata()).to.deep.equal(expected)
+  })
+
+  it('tags are correctly generated from vars', () => {
+    delete process.env.WEBSITE_RESOURCE_GROUP
+    delete process.env.WEBSITE_OS
+    delete process.env.FUNCTIONS_EXTENSION_VERSION
+    delete process.env.FUNCTIONS_WORKER_RUNTIME
+    delete process.env.FUNCTIONS_WORKER_RUNTIME_VERSION
+    process.env.COMPUTERNAME = 'boaty_mcboatface'
+    process.env.DD_AZURE_APP_SERVICES = '1'
+    process.env.WEBSITE_SITE_NAME = 'website_name'
+    process.env.WEBSITE_OWNER_NAME = 'subscription_id+resource_group-regionwebspace'
+    process.env.WEBSITE_INSTANCE_ID = 'instance_id'
+    process.env.DD_AAS_DOTNET_EXTENSION_VERSION = '1.0'
+    const expected = {
+      'aas.environment.extension_version': '1.0',
+      'aas.environment.instance_id': 'instance_id',
+      'aas.environment.instance_name': 'boaty_mcboatface',
+      'aas.environment.os': os.platform(),
+      'aas.resource.group': 'resource_group',
+      'aas.resource.id':
+        '/subscriptions/subscription_id/resourcegroups/resource_group/providers/microsoft.web/sites/website_name',
+      'aas.site.kind': 'app',
+      'aas.site.name': 'website_name',
+      'aas.site.type': 'app',
+      'aas.subscription.id': 'subscription_id'
+    }
+    expect(getAzureTagsFromMetadata(getAzureAppMetadata())).to.deep.equal(expected)
+  })
+})