feat: Allow return the client without performing a matchRepository

[jsolana]

Closes #17948

Modify the behavior during DetectConfigManagementPlugin to avoid transferring the entire repository to cmp-server here
Use a new pre-flight operation to check if discovery is enabled or not.
If discover is not configured, returns the client without without further checks

Checklist:

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[crenshaw-dev]

I think we still only want to do this if discovery is not enabled, since the CMP author might be using discovery as a sort of safety or even security mechanism.

We probably need a pre-flight request to get isDiscoveryEnabled without sending the whole repo. That's a somewhat more involved change, since it'll introduce a new API endpoint.

[jsolana]

Make a lot of sense, let me update the MR
Thanks a lot for your feedback!

[jsolana]

What do you think @crenshaw-dev ?

plugin.proto

message CheckPluginConfigurationResponse {
    bool isDiscoveryConfigured = 1;
}


...

// CheckPluginConfiguration is a pre-flight request  to check the plugin configuration
    // without sending the whole repo.
    rpc CheckPluginConfiguration(stream AppStreamRequest) returns (CheckPluginConfigurationResponse) {
    }

In that case isDiscoveryConfigured will be true if there is any discovery.FileName or discovery.Find info (in this case we won't propagate repo info, then, no pattern matching will be executed)

plugin.go

type CheckPluginConfigurationStream interface {
	Stream
	SendAndClose(response *apiclient.CheckPluginConfigurationResponse) error
}

func (s *Service) CheckPluginConfiguration(stream apiclient.ConfigManagementPluginService_CheckPluginConfigurationServer) error {
	return s.checkPluginConfigurationGeneric(stream)
}

func (s *Service) checkPluginConfigurationGeneric(stream CheckPluginConfigurationStream) error {
	isDiscoveryConfigured := s.isDiscoveryConfigured()
	repoResponse := &apiclient.CheckPluginConfigurationResponse{IsDiscoveryConfigured: isDiscoveryConfigured}

	err := stream.SendAndClose(repoResponse)
	if err != nil {
		return fmt.Errorf("error sending check plugin configuration response: %w", err)
	}
	return nil
}

func (s *Service) isDiscoveryConfigured() (IsDiscoveryConfigured bool) {
	config := s.initConstants.PluginConfig
	return config.Spec.Discover.FileName != "" || config.Spec.Discover.Find.Glob != "" || len(config.Spec.Discover.Find.Command.Command) > 0
}

Wdyt?

[crenshaw-dev]

I think the rough idea makes sense. I'm not sure it would need to be a streaming request. If I understand correctly, we wouldn't need to send any streaming contents to the CMP.

[jsolana]

Yep I was thinking the same, I ve mimic other operations but no strong opinion about stream vs unary op in this moment 😅
Gonna update it to use unary call
Thanks mate

[jsolana]

Done! Let me know wdyt! (also title and description of the PR was updated)
Thanks for all your support @crenshaw-dev :)

[codecov]

Codecov Report

Attention: Patch coverage is 53.84615% with 6 lines in your changes missing coverage. Please review.

Project coverage is 50.64%. Comparing base (b909993) to head (d54cbcc).
Report is 561 commits behind head on master.

Files with missing lines	Patch %	Lines
util/app/discovery/discovery.go	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #18053      +/-   ##
==========================================
- Coverage   50.64%   50.64%   -0.01%     
==========================================
  Files         315      315              
  Lines       43286    43299      +13     
==========================================
+ Hits        21924    21929       +5     
- Misses      18859    18870      +11     
+ Partials     2503     2500       -3     

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