Adding Generic V1 compatability getters for Pubsub

[shettyvarun268]

This PR refactors the V1 compatibility layer to be more generic and centralized. It improves upon the previous provider-specific approach (#1800) for Pub/Sub by moving the core logic to a shared module.

We created a patchV1Compat function that adds V1-style context and message properties to V2 CloudEvents. This function uses Symbols for idempotency and lazy getters for performance. The Pub/Sub provider now uses this generic function, reducing code duplication.

This change makes the V1 compatibility layer more maintainable and easier to extend to other Firebase services, providing a consistent experience for developers migrating from V1 to V2. The PubSubCloudEvent type is also exported for better type safety.

[gemini-code-assist]

Summary of Changes

Hello @shettyvarun268, 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 refactors the V1 compatibility layer for Firebase functions, moving from a provider-specific implementation to a more generic and centralized approach. The core logic for adapting V2 CloudEvents to V1-style context and message properties is now housed in a new shared module. This change enhances maintainability, reduces code duplication, and sets the groundwork for easier extension to other Firebase services, ensuring a consistent developer experience during migration.

Highlights

• Centralized V1 Compatibility Logic: A new module, src/v2/compat.ts, was introduced to centralize the V1 compatibility layer, moving away from provider-specific implementations.
• Generic patchV1Compat Function: A patchV1Compat function was implemented to dynamically add V1-style context and message properties to V2 CloudEvents, specifically for Pub/Sub events.
• Improved Type Safety: The PubSubCloudEvent type is now exported, enhancing type safety and consistency for developers migrating from V1 to V2.
• Reduced Code Duplication: The Pub/Sub provider (src/v2/providers/pubsub.ts) was refactored to utilize the new generic patchV1Compat function, significantly reducing duplicated compatibility logic.
• Cleaned Up Pub/Sub Provider: Provider-specific V1_CONTEXT and V1_MESSAGE symbols, along with the MessagePublishedEvent interface, were removed from the Pub/Sub provider.

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Changelog

• src/v2/compat.ts
  • Added a new file to define V1 compatibility interfaces (V1Context, V1PubSubMessage) and the PubSubCloudEvent type.
  • Introduced patchV1Compat function to dynamically add V1-style context and message getters to CloudEvents.
• src/v2/index.ts
  • Exported the new PubSubCloudEvent type from the compat.ts module.
• src/v2/providers/pubsub.ts
  • Removed the V1_CONTEXT and V1_MESSAGE Symbol declarations.
  • Removed the import for EventContext from v1.
  • Imported patchV1Compat and PubSubCloudEvent from the new compat.ts module.
  • Deleted the MessagePublishedEvent interface.
  • Updated the onMessagePublished function overloads and implementation to use PubSubCloudEvent instead of the removed MessagePublishedEvent.
  • Replaced the explicit Object.defineProperty calls for context and message with a single call to the patchV1Compat function.

Activity

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[shettyvarun268]

/gemini review

[gemini-code-assist]

Code Review

This pull request effectively refactors the V1 compatibility layer for Pub/Sub events into a generic, centralized module src/v2/compat.ts. This is a great improvement for maintainability and extensibility. The use of lazy getters for performance is well-implemented.

My review focuses on a couple of key areas:

1. There's an inefficiency where the Message object is instantiated twice. I've suggested changes to centralize this logic within the new patchV1Compat function.
2. I've also included some suggestions to improve type safety and remove redundant code in the new compatibility module.

Overall, this is a solid refactoring that will make the V1 compatibility layer much cleaner.

[gemini-code-assist]

Code Review

This pull request effectively refactors the V1 compatibility layer for Pub/Sub into a more generic and centralized patchV1Compat function. This is a solid improvement for maintainability and makes it easier to extend compatibility to other services. The use of lazy getters is a good choice for performance. My review includes a few suggestions to further improve the implementation. Specifically, I recommend strengthening the idempotency check using a Symbol and fully centralizing the Message instantiation logic within the new compatibility function to eliminate redundancy. Overall, this is a valuable refactoring.

[gemini-code-assist]

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[shettyvarun268]

/gemini review

[gemini-code-assist]

Code Review

This pull request refactors the V1 compatibility layer for Pub/Sub events, centralizing the logic into a new patchV1Compat function. This change aims to reduce code duplication and improve maintainability, making it easier to extend V1 compatibility to other Firebase services. The PR introduces idempotency using Symbols and lazy getters for performance, and exports PubSubCloudEvent for better type safety. Overall, the refactoring is a positive step towards a more generic and robust compatibility layer.

[shettyvarun268]

/gemini review

[gemini-code-assist]

Code Review

This pull request is a significant improvement to the V1 compatibility layer. By centralizing the logic into a generic patchV1Compat function in a new compat.ts module, you've greatly reduced code duplication in the Pub/Sub provider and made the system more maintainable and extensible for other services. The use of a Symbol for idempotency and lazy getters for performance are excellent choices. The new tests in compat.spec.ts are thorough and cover the key aspects of the new functionality. Overall, this is a well-executed refactoring.