.NET: CosmosDB Actor State Storage#262
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Pull Request Overview
This PR adds a CosmosDB-based implementation for actor state storage in the AI Agents framework. It provides an alternative storage backend to the default in-memory storage for persistent actor state management.
Key changes include:
- A complete CosmosDB implementation of
IActorStateStoragewith optimistic concurrency control - Comprehensive integration tests using Aspire for both real CosmosDB and emulator scenarios
- Service collection extensions for easy dependency injection setup
Reviewed Changes
Copilot reviewed 19 out of 19 changed files in this pull request and generated 5 comments.
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| File | Description |
|---|---|
CosmosActorStateStorage.cs |
Core implementation of actor state storage using CosmosDB with document structure and transactional batch operations |
ServiceCollectionExtensions.cs |
DI configuration helpers for registering CosmosDB storage with various setup options |
| Test files | Comprehensive integration tests covering CRUD operations, concurrency, list operations, and edge cases |
| Sample integration | Example usage in HelloHttpApi sample showing how to integrate CosmosDB storage |
| Project files | Package references and solution structure updates |
...Microsoft.Extensions.AI.Agents.Runtime.Storage.CosmosDB.Tests/SkipOnEmulatorFactAttribute.cs
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....Extensions.AI.Agents.Runtime.Storage.CosmosDB.Tests/CosmosActorStateStorageListKeysTests.cs
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dotnet/src/Microsoft.Extensions.AI.Agents.Runtime.Storage.CosmosDB/CosmosActorStateStorage.cs
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dotnet/src/Microsoft.Extensions.AI.Agents.Runtime.Storage.CosmosDB/CosmosActorStateStorage.cs
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dotnet/src/Microsoft.Extensions.AI.Agents.Runtime.Storage.CosmosDB/CosmosActorStateStorage.cs
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dotnet/src/Microsoft.Extensions.AI.Agents.Runtime.Storage.CosmosDB/CosmosActorStateStorage.cs
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dotnet/src/Microsoft.Extensions.AI.Agents.Runtime.Storage.CosmosDB/LazyCosmosContainer.cs
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* Implement CosmosDB actor state storage. * Fix. * Minor fixes. * Fixes. * Make CosmosDB initialization be lazy. * Remove unnecessary read from write path. * Throw on empty writes. * Add arg validation for read. * Add CosmosIdSanitizer. * Fix. * Fix. * Simplify doc IDs. * Update comment. * fb * Make LazyCosmosContainer internal and add tests. * Make test constants public and remove IVT. * Use source generated JSON context for future nativeAOT support. * Re-add dropped comments.
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* Implement CosmosDB actor state storage. * Fix. * Minor fixes. * Fixes. * Make CosmosDB initialization be lazy. * Remove unnecessary read from write path. * Throw on empty writes. * Add arg validation for read. * Add CosmosIdSanitizer. * Fix. * Fix. * Simplify doc IDs. * Update comment. * fb * Make LazyCosmosContainer internal and add tests. * Make test constants public and remove IVT. * Use source generated JSON context for future nativeAOT support. * Re-add dropped comments.
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This change adds an IActorStateStorage implementation that uses CosmosDB, and a set of tests for it that use Aspire and can run either using the real service or in the emulator.
I've just rebased everything onto current main (was previously based on a personal feature branch) and had to disable a few warnings to get things building and running. I suspect we'll be able to resolve some of those soon but I didn't want to delay getting this PR out.