Extract Catalog stock validation service

[mattfromcursor]

Plan

Summary

Extract Catalog stock validation from OrderStatusChangedToAwaitingValidationIntegrationEventHandler into a dedicated ICatalogStockValidationService implementation while leaving event contracts, RabbitMQ subscriptions, and ICatalogIntegrationEventService outbox/publish behavior unchanged.

Files

• src/Catalog.API/IntegrationEvents/ICatalogStockValidationService.cs - new interface for stock validation.
• src/Catalog.API/IntegrationEvents/CatalogStockValidationService.cs - new implementation that loads catalog items and returns either OrderStockRejectedIntegrationEvent or OrderStockConfirmedIntegrationEvent.
• src/Catalog.API/IntegrationEvents/EventHandling/OrderStatusChangedToAwaitingValidationIntegrationEventHandler.cs - delegate validation to the service, then save and publish through ICatalogIntegrationEventService exactly as before.
• src/Catalog.API/Extensions/Extensions.cs - register ICatalogStockValidationService with DI.

Interface methods

• Task<IntegrationEvent> ValidateStockAsync(int orderId, IEnumerable<OrderStockItem> orderStockItems)

DI

• Add builder.Services.AddTransient<ICatalogStockValidationService, CatalogStockValidationService>(); in src/Catalog.API/Extensions/Extensions.cs alongside the Catalog integration-event services.

Risks to event publishing

• Preserve SaveEventAndCatalogContextChangesAsync(...) followed by PublishThroughEventBusAsync(...) in the handler to avoid changing outbox persistence and publish ordering.
• Do not change ICatalogIntegrationEventService, EventBus contracts, event records, or Ordering.API consumers.
• Keep RabbitMQ subscription registration unchanged so OrderStatusChangedToAwaitingValidationIntegrationEvent continues to reach the same handler.

Build output

Requested command

dotnet restore eShop.Web.slnf && dotnet build eShop.Web.slnf

Result: blocked by environment/network access before compilation. NuGet vulnerability audit could not reach https://api.nuget.org/v3/index.json, producing NU1900 warnings as errors across solution projects.

Representative output:

• /workspace/src/Catalog.API/Catalog.API.csproj : error NU1900: Warning As Error: Error occurred while getting package vulnerability data: Unable to load the service index for source https://api.nuget.org/v3/index.json.
• Failed to restore ...

Compile verification fallback

dotnet restore eShop.Web.slnf -p:NuGetAudit=false && dotnet build eShop.Web.slnf --no-restore -p:NuGetAudit=false -p:LibraryRestore=False

Result: build succeeded after disabling external NuGet audit and LibMan cdnjs restore for this network-restricted environment.

Output:

• Catalog.API -> /workspace/artifacts/bin/Catalog.API/debug/Catalog.API.dll
• eShop.AppHost -> /workspace/artifacts/bin/eShop.AppHost/debug/eShop.AppHost.dll
• Build succeeded.
• 0 Warning(s)
• 0 Error(s)