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feat: add ObjectContexts to Blob#1767

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feat-object-contexts-1046589087761828711
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feat: add ObjectContexts to Blob#1767
nidhiii-27 wants to merge 2 commits intomainfrom
feat-object-contexts-1046589087761828711

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@nidhiii-27 nidhiii-27 commented Mar 8, 2026

This PR adds the Object Contexts feature, implementing strongly-typed payloads for arbitrary context configuration mimicking the Java storage client's implementation.

  • Created google/cloud/storage/contexts.py specifying the schema for ObjectContexts and ObjectCustomContextPayload.
  • Exposed the contexts property on Blob objects which performs mapping to underlying properties for patching.
  • Included robust tests assessing mapping flat vs deep payload representations.

PR created automatically by Jules for task 1046589087761828711 started by @nidhiii-27

@google-labs-jules @nidhiii-27
feat: add ObjectContexts property to Blob
3f87653 
Added the `ObjectContexts` and `ObjectCustomContextPayload` classes to represent user-defined object contexts, analogous to Java's `ObjectContexts`. Added `contexts` getter and setter to `Blob` class which automatically formats and parses dictionaries to the expected API representation. Integrated the corresponding system and unit tests.

Co-authored-by: nidhiii-27 <224584462+nidhiii-27@users.noreply.github.com>
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@nidhiii-27 nidhiii-27 requested review from a team as code owners March 8, 2026 16:22
@product-auto-label product-auto-label bot added the size: l Pull request size is large. label Mar 8, 2026
@product-auto-label product-auto-label bot added the api: storage Issues related to the googleapis/python-storage API. label Mar 8, 2026
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Summary of Changes

Hello, 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 enhances the Google Cloud Storage Python client by adding support for Object Contexts on Blob objects. This feature provides a structured and strongly-typed mechanism for associating custom, arbitrary data with objects, bringing the Python client's capabilities in line with other language clients like Java. The changes involve defining new data structures for contexts and integrating them seamlessly into the existing Blob API for easy management.

Highlights

  • New Feature: Object Contexts: Introduced the Object Contexts feature to the Blob object, allowing for strongly-typed payloads for arbitrary context configuration, mirroring the Java storage client's implementation.
  • New Module for Contexts: Created google/cloud/storage/contexts.py to define the schema for ObjectContexts and ObjectCustomContextPayload.
  • Blob Integration: Exposed a new contexts property on Blob objects, which handles the mapping to underlying properties for patching operations.
  • Comprehensive Testing: Included robust system and unit tests to assess the mapping of both flat and deep payload representations for object contexts.
Changelog
  • google/cloud/storage/blob.py
    • Imported ObjectContexts and ObjectCustomContextPayload from the new contexts module.
    • Added a new @property and @contexts.setter to the Blob class, enabling retrieval and setting of object contexts.
    • Implemented logic within the setter to handle various input types for contexts, including ObjectContexts instances, dictionaries, and None.
  • google/cloud/storage/contexts.py
    • Added a new file contexts.py to define the ObjectCustomContextPayload class for individual context entries.
    • Added the ObjectContexts class to manage a collection of custom object contexts.
    • Included _from_api_resource and _to_api_resource methods in both classes for serialization and deserialization with the API.
  • tests/system/test_blob.py
    • Added a new system test test_blob_contexts to verify the end-to-end functionality of setting, updating, and deleting object contexts on a blob.
  • tests/unit/test_blob.py
    • Added test_contexts_getter to verify correct parsing of API responses into ObjectContexts objects.
    • Added test_contexts_setter_w_dict to confirm proper handling of dictionary assignments to the contexts property.
    • Added test_contexts_setter_w_object_contexts to ensure ObjectContexts instances are correctly processed by the setter.
    • Added test_contexts_setter_none to validate that assigning None to contexts correctly clears the property.
Activity
  • The pull request was automatically created by Jules for a task initiated by @nidhiii-27.
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@nidhiii-27 nidhiii-27 marked this pull request as draft March 8, 2026 16:23
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Code Review

This pull request introduces the Object Contexts feature, which is a great addition for parity with the Java client. The implementation looks solid, with new classes for ObjectContexts and ObjectCustomContextPayload, and the necessary integration into the Blob object. The tests are also comprehensive, covering both unit and system-level verification.

I have a couple of suggestions to improve code maintainability by reducing some code duplication and simplifying logic, and ensuring proper handling of mutable dictionary parameters. Overall, this is a well-executed feature.

@google-labs-jules @nidhiii-27
chore: add ObjectContexts property to Blob
e0493ec 
Added the strongly-typed `ObjectContexts` and `ObjectCustomContextPayload` schema classes to interact with the new `contexts` field on Google Cloud Storage `Blob` objects. Integrated these changes as a property on the `Blob` class which automatically resolves updates and patches for dictionaries mapping configurations to explicit subclasses. Added system and unit tests mimicking existing configurations.

Co-authored-by: nidhiii-27 <224584462+nidhiii-27@users.noreply.github.com>
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