add datadog it support

[derrickaw]

1. Add some datadog it support.
2. More support for [Task]: Add Datadog IO support to Beam #37318 :)
3. Ported and refactored from here.
4. ./gradlew :it:datadog:test

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Summary of Changes

Hello @derrickaw, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a dedicated integration test module for Datadog within the Apache Beam project. It provides a robust framework for simulating Datadog interactions, allowing developers to effectively test Beam pipelines that produce or consume data from Datadog. The new module includes a resource manager to control a mock Datadog server, data structures for log entries, and assertion utilities to validate test outcomes.

Highlights

• New Datadog Integration Test Module: A new Gradle module it:datadog has been added to provide integration test support for Datadog, enabling testing of Beam pipelines interacting with Datadog services.
• DatadogResourceManager: Introduced DatadogResourceManager which leverages Testcontainers and MockServer to simulate a Datadog API endpoint, allowing for sending and retrieving log entries in a controlled test environment.
• DatadogLogEntry and Utilities: Added DatadogLogEntry as an AutoValue class to represent Datadog log data, along with DatadogClientFactory for HTTP and MockServer client creation, and DatadogResourceManagerUtils for helper functions like API key generation and log entry mapping.
• Testing Utilities: Included DatadogLogEntriesCheck for asserting the number of log entries received by the mock server and DatadogAsserts for Truth-based assertions on Datadog log entries in tests.
• Comprehensive Test Coverage: Both unit tests (DatadogResourceManagerTest, DatadogResourceManagerUtilsTest) and an integration test (DatadogResourceManagerIT) have been added to ensure the reliability and functionality of the new Datadog IT support.

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Changelog

• it/datadog/build.gradle
  • Added new Gradle build file for the it:datadog module.
  • Configured dependencies including it:common, it:testcontainers, it:truthmatchers, it:conditions, org.testcontainers:mockserver, org.mock-server:mockserver-client-java, org.apache.httpcomponents:httpclient, and com.google.code.gson.
• it/datadog/src/main/java/org/apache/beam/it/datadog/DatadogClientFactory.java
  • Added DatadogClientFactory class to provide CloseableHttpClient for sending HTTP messages and MockServerClient for interacting with the mock server.
• it/datadog/src/main/java/org/apache/beam/it/datadog/DatadogLogEntry.java
  • Added DatadogLogEntry as an AutoValue class to model Datadog log entries with fields like ddsource, ddtags, hostname, service, and message.
• it/datadog/src/main/java/org/apache/beam/it/datadog/DatadogResourceManager.java
  • Added DatadogResourceManager to manage a mock Datadog server using Testcontainers.
  • Implemented methods to get HTTP and API endpoints, retrieve the API key, send single or multiple DatadogLogEntry events, and retrieve recorded log entries.
  • Configured the mock server to accept POST requests to /api/v2/logs with specific headers and JSON schema.
• it/datadog/src/main/java/org/apache/beam/it/datadog/DatadogResourceManagerException.java
  • Added DatadogResourceManagerException as a custom runtime exception for errors within the Datadog resource manager.
• it/datadog/src/main/java/org/apache/beam/it/datadog/DatadogResourceManagerUtils.java
  • Added DatadogResourceManagerUtils with static methods to convert DatadogLogEntry objects to a Map<String, Object> and to generate a secure Datadog API key.
• it/datadog/src/main/java/org/apache/beam/it/datadog/conditions/DatadogLogEntriesCheck.java
  • Added DatadogLogEntriesCheck as a ConditionCheck implementation to verify if the mock Datadog server has received a specified minimum (and optional maximum) number of log entries.
• it/datadog/src/main/java/org/apache/beam/it/datadog/conditions/package-info.java
  • Added package-info.java for the conditions subpackage.
• it/datadog/src/main/java/org/apache/beam/it/datadog/matchers/DatadogAsserts.java
  • Added DatadogAsserts utility class with static methods to convert DatadogLogEntry collections to a list of maps and to create RecordsSubject for Truth assertions.
• it/datadog/src/main/java/org/apache/beam/it/datadog/matchers/package-info.java
  • Added package-info.java for the matchers subpackage.
• it/datadog/src/main/java/org/apache/beam/it/datadog/package-info.java
  • Added package-info.java for the main datadog package.
• it/datadog/src/test/java/org/apache/beam/it/datadog/DatadogResourceManagerIT.java
  • Added integration tests for DatadogResourceManager to verify end-to-end functionality of sending and retrieving log entries.
• it/datadog/src/test/java/org/apache/beam/it/datadog/DatadogResourceManagerTest.java
  • Added unit tests for DatadogResourceManager, covering client factory interactions, HTTP endpoint generation, API key handling, and error scenarios during event sending and retrieval.
• it/datadog/src/test/java/org/apache/beam/it/datadog/DatadogResourceManagerUtilsTest.java
  • Added unit tests for DatadogResourceManagerUtils, specifically for datadogEntryToMap conversion and generateApiKey functionality.
• settings.gradle.kts
  • Added include(":it:datadog") to the settings.gradle.kts file to include the new Datadog integration test module in the project build.

Activity

• The pull request was opened by derrickaw with the title "add datadog it support" and a description outlining the purpose of adding Datadog integration test support.
• The description includes a standard checklist for contributions, such as mentioning issues, updating CHANGES.md, and filing an ICLA if applicable.
• Links to build health status and CI information are provided in the PR description.

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