feat: Add support for Flagd-Selector header when syncing flags with InProcess resolver

[kylejuliandev]

This PR

Builds on #595 by adding updating the flagd schemas submodule and adds support for sending a SyncFlags gRPC request with a Flagd-Selector header. We need to supress the obsolete Selector = this._config.SourceSelector property so it will continue to build but this allows us to utilise both methods. The gRPC Header takes precendence and the selector in the protbuf body is being deprecated.

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Summary of Changes

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This pull request enhances the InProcess resolver for Flagd by introducing the capability to utilize the Flagd-Selector header during flag synchronization, building on previous work. This change allows for more refined control over which flags are retrieved. It also includes an update to the underlying flagd schemas and ensures backward compatibility with the existing Selector property by explicitly handling its obsolescence.

Highlights

• Flagd-Selector Header Support: Implemented support for sending the Flagd-Selector header with SyncFlags gRPC requests in the InProcess resolver, allowing for more precise flag synchronization.
• Schema Submodule Update: Updated the flagd schemas git submodule to incorporate the latest schema definitions.
• Obsolete Property Handling: Managed the use of the obsolete Selector property in SyncFlagsRequest by applying #pragma warning disable CS0612 to ensure continued build compatibility.
• Test Suite Updates: Adjusted existing unit tests to correctly mock and assert SyncFlags calls, now accounting for the new Metadata parameter and the Flagd-Selector header.

Changelog

• src/OpenFeature.Contrib.Providers.Flagd/Resolver/InProcess/InProcessResolver.cs
  • Modified the SyncFlags gRPC call to pass Flagd-Selector as a gRPC metadata header.
  • Wrapped the SyncFlagsRequest instantiation with #pragma warning disable CS0612 and #pragma warning restore CS0612 to handle the obsolete Selector property.
• src/OpenFeature.Contrib.Providers.Flagd/schemas
  • Updated the git submodule reference to 9f823b5b36bf219f8ea342de006fdf5013c1bc79.
• test/OpenFeature.Contrib.Providers.Flagd.Test/FlagdProviderTest.cs
  • Updated mockGrpcClient.SyncFlags setup to accept Arg.Any<Metadata>() for the headers parameter.
  • Modified mockGrpcClient.Received assertion to check both the Selector property in the request and the Flagd-Selector value in the Metadata headers.
• test/OpenFeature.Contrib.Providers.Flagd.Test/Resolver/InProcess/InProcessResolverTests.cs
  • Updated mockGrpcClient.SyncFlags setup to accept Arg.Any<Grpc.Core.Metadata>() for the headers parameter.

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Code Review

This pull request adds support for the Flagd-Selector header when using the InProcess resolver, which is a good feature enhancement. The implementation correctly sends both the new header and the obsolete Selector property for backward compatibility. The associated tests have been updated to verify this new behavior.

[askpt]

LGTM. I am just wondering if we can change this to use the new behaviour instead of marking as warning disable.

[toddbaert]

I made some minor changes (extracted a constant and added a null check). Thanks @kylejuliandev !