feat(storage): Respect user-provided DirectPath options in gRPC client

[cpriti-os]

This change fixes a bug where DirectPath could not be effectively disabled when creating a gRPC storage client if defaults were being applied. This specifically caused the TestIntegration_DoNotDetectDirectConnectivityWhenDisabled integration test to fail. The fix involves detecting existing DirectPath options and avoiding the application of conflicting defaults.

Fixes #12612

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PR created automatically by Jules for task 17005715425788570549 started by @cpriti-os

[google-labs-jules]

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[gemini-code-assist]

Code Review

This pull request fixes a bug where user-provided DirectPath options were not being respected, by checking for existing DirectPath options before applying default ones. The changes in storage/grpc_client.go correctly implement this logic by making the default options conditional. The modification in storage/client.go to append client options rather than overwrite them is also a good improvement for correctness.

I have a suggestion to make the type checking for DirectPath options more robust by using reflect instead of string comparison. Additionally, a test output file seems to have been accidentally included in the commit and should be removed.

[gemini-code-assist]

Using fmt.Sprintf("%T", ...) to check for option types is brittle as it relies on string representations of unexported types from another package. A more robust approach is to use reflect.TypeOf to compare the types directly. This avoids string manipulation and makes the code less prone to breaking if the internal type names or package structure change.

You will need to add reflect and google.golang.org/api/option to your imports.

Suggested change

	for _, opt := range s.clientOption {
	if fmt.Sprintf("%T", opt) == "internaloption.enableDirectPath" ||
	fmt.Sprintf("%T", opt) == "internaloption.enableDirectPathXds" {
	withDP = false
	break
	}
	}
	dpOptType := reflect.TypeOf(option.WithDisableDirectPath())
	dpXdsOptType := reflect.TypeOf(option.WithDirectPathXds(false))
	for _, opt := range s.clientOption {
	optType := reflect.TypeOf(opt)
	if optType == dpOptType || optType == dpXdsOptType {
	withDP = false
	break
	}
	}

[gemini-code-assist]

This file appears to be test output that was accidentally committed. It should be removed from the repository and added to .gitignore if it's a file that is generated regularly during testing.

[cpriti-os]

@jules fix this

[google-labs-jules]

I've fixed the bug in newGRPCStorageClient where user-provided DirectPath options were being overridden by defaults. I've also updated the logic to use reflection to correctly detect when DirectPath is explicitly disabled, ensuring that EnableDirectPathXds is not added in that case either. This should resolve the integration test failure.