Handling mutliple namespaces

[zeeke]

A networkpolicy can refer to multiple NADs, which can be in different namespaces.

Avoid filtering peerPods using the exact networkname and use the policy's policy-for annotation.
Create an end2end test case that involves pods from multiple namespaces.

Improve the integration test verification method by introducing the golden file pattern, which also offers a better understanding of the nftables generated by the controller.

[gemini-code-assist]

Summary of Changes

Hello @zeeke, 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 significantly enhances the MultiNetworkPolicy functionality by enabling it to manage network policies across multiple Kubernetes namespaces and NetworkAttachmentDefinitions. The core change involves updating the policy enforcement mechanism to correctly identify and apply rules based on the policy-for annotation, ensuring accurate peer pod filtering. This improvement provides greater flexibility for defining complex network security policies in multi-tenant or distributed environments, validated by a new comprehensive end-to-end test.

Highlights

• Multi-Namespace Network Policy Support: MultiNetworkPolicy now supports referencing NetworkAttachmentDefinitions (NADs) that reside in different namespaces, enhancing cross-namespace network policy capabilities.
• Refined Peer Pod Filtering: The logic for filtering peer pods has been updated to utilize the policy-for annotation within the MultiNetworkPolicy, allowing for more precise and flexible network selection across namespaces.
• New End-to-End Test Case: A new end-to-end test case has been added to validate the correct enforcement of MultiNetworkPolicy across multiple namespaces and distinct network configurations.

Using Gemini Code Assist

The full guide for Gemini Code Assist can be found on our documentation page, here are some quick tips.

Invoking Gemini

You can request assistance from Gemini at any point by creating a comment using either /gemini <command> or @gemini-code-assist <command>. Below is a summary of the supported commands on the current page.

Feature	Command	Description
Code Review	/gemini review	Performs a code review for the current pull request in its current state.
Pull Request Summary	/gemini summary	Provides a summary of the current pull request in its current state.
Comment	@gemini-code-assist	Responds in comments when explicitly tagged, both in pull request comments and review comments.
Help	/gemini help	Displays a list of available commands.

Customization

To customize Gemini Code Assist for GitHub experience, repository maintainers can create a configuration file and/or provide a custom code review style guide (such as PEP-8 for Python) by creating and adding files to a .gemini/ folder in the base of the repository. Detailed instructions can be found here.

Limitations & Feedback

Gemini Code Assist may make mistakes. Please leave feedback on any instances where its feedback is incorrect or counter productive. You can react with 👍 and 👎 on @gemini-code-assist comments. If you're interested in giving your feedback about your experience with Gemini Code Assist for Github and other Google products, sign up here.

You can also get AI-powered code generation, chat, as well as code reviews directly in the IDE at no cost with the Gemini Code Assist IDE Extension.

Footnotes

1. Review the Privacy Notices, Generative AI Prohibited Use Policy, Terms of Service, and learn how to configure Gemini Code Assist in GitHub here. Gemini can make mistakes, so double check it and use code with caution. ↩

[gemini-code-assist]

Code Review

This pull request correctly refactors the logic to handle multiple namespaces for network policies by leveraging the policy-for annotation. The addition of a new end-to-end test for multi-namespace scenarios is a great improvement. My review focuses on improving the reliability of the new test and fixing a minor typo in the Go code.

[mlguerrero12]

Nice work @zeeke! Just some minor comments

[zeeke]

Thanks @mlguerrero12 for the review! I addressed your comments

(Hope everything is going well in your new adventure! 😃)