Move file one folder level up to avoid namespace conflict

Clusters::Cluster::KnativeServicesFinder becomes
Clusters::KnativeServicesFinder

This is to avoid loading race condition between:

```
module Clusters
  class Cluster < ApplicationRecord
```

and

```
module Clusters
  class Cluster
```

app/finders/clusters/cluster/knative_services_finder.rb

@@ -1,114 +0,0 @@
-# frozen_string_literal: true
-module Clusters
-  class Cluster
-    class KnativeServicesFinder
-      include ReactiveCaching
-      include Gitlab::Utils::StrongMemoize
-
-      KNATIVE_STATES = {
-        'checking' => 'checking',
-        'installed' => 'installed',
-        'not_found' => 'not_found'
-      }.freeze
-
-      self.reactive_cache_key = ->(finder) { finder.model_name }
-      self.reactive_cache_worker_finder = ->(_id, *cache_args) { from_cache(*cache_args) }
-
-      attr_reader :cluster, :project
-
-      def initialize(cluster, project)
-        @cluster = cluster
-        @project = project
-      end
-
-      def with_reactive_cache_memoized(*cache_args, &block)
-        strong_memoize(:reactive_cache) do
-          with_reactive_cache(*cache_args, &block)
-        end
-      end
-
-      def clear_cache!
-        clear_reactive_cache!(*cache_args)
-      end
-
-      def self.from_cache(cluster_id, project_id)
-        cluster = Clusters::Cluster.find(cluster_id)
-        project = ::Project.find(project_id)
-
-        new(cluster, project)
-      end
-
-      def calculate_reactive_cache(*)
-        # read_services calls knative_client.discover implicitily. If we stop
-        # detecting services but still want to detect knative, we'll need to
-        # explicitily call: knative_client.discover
-        #
-        # We didn't create it separately to avoid 2 cluster requests.
-        ksvc = read_services
-        pods = knative_client.discovered ? read_pods : []
-        { services: ksvc, pods: pods, knative_detected: knative_client.discovered }
-      end
-
-      def services
-        return [] unless search_namespace
-
-        cached_data = with_reactive_cache_memoized(*cache_args) { |data| data }
-        cached_data.to_h.fetch(:services, [])
-      end
-
-      def cache_args
-        [cluster.id, project.id]
-      end
-
-      def service_pod_details(service)
-        cached_data = with_reactive_cache_memoized(*cache_args) { |data| data }
-        cached_data.to_h.fetch(:pods, []).select do |pod|
-          filter_pods(pod, service)
-        end
-      end
-
-      def knative_detected
-        cached_data = with_reactive_cache_memoized(*cache_args) { |data| data }
-
-        knative_state = cached_data.to_h[:knative_detected]
-
-        return KNATIVE_STATES['checking'] if knative_state.nil?
-        return KNATIVE_STATES['installed'] if knative_state
-
-        KNATIVE_STATES['uninstalled']
-      end
-
-      def model_name
-        self.class.name.underscore.tr('/', '_')
-      end
-
-      private
-
-      def search_namespace
-        @search_namespace ||= cluster.kubernetes_namespace_for(project)
-      end
-
-      def knative_client
-        cluster.kubeclient.knative_client
-      end
-
-      def filter_pods(pod, service)
-        pod["metadata"]["labels"]["serving.knative.dev/service"] == service
-      end
-
-      def read_services
-        knative_client.get_services(namespace: search_namespace).as_json
-      rescue Kubeclient::ResourceNotFoundError
-        []
-      end
-
-      def read_pods
-        cluster.kubeclient.core_client.get_pods(namespace: search_namespace).as_json
-      end
-
-      def id
-        nil
-      end
-    end
-  end
-end

app/finders/clusters/knative_services_finder.rb

@@ -0,0 +1,112 @@
+# frozen_string_literal: true
+module Clusters
+  class KnativeServicesFinder
+    include ReactiveCaching
+    include Gitlab::Utils::StrongMemoize
+
+    KNATIVE_STATES = {
+      'checking' => 'checking',
+      'installed' => 'installed',
+      'not_found' => 'not_found'
+    }.freeze
+
+    self.reactive_cache_key = ->(finder) { finder.model_name }
+    self.reactive_cache_worker_finder = ->(_id, *cache_args) { from_cache(*cache_args) }
+
+    attr_reader :cluster, :project
+
+    def initialize(cluster, project)
+      @cluster = cluster
+      @project = project
+    end
+
+    def with_reactive_cache_memoized(*cache_args, &block)
+      strong_memoize(:reactive_cache) do
+        with_reactive_cache(*cache_args, &block)
+      end
+    end
+
+    def clear_cache!
+      clear_reactive_cache!(*cache_args)
+    end
+
+    def self.from_cache(cluster_id, project_id)
+      cluster = Clusters::Cluster.find(cluster_id)
+      project = ::Project.find(project_id)
+
+      new(cluster, project)
+    end
+
+    def calculate_reactive_cache(*)
+      # read_services calls knative_client.discover implicitily. If we stop
+      # detecting services but still want to detect knative, we'll need to
+      # explicitily call: knative_client.discover
+      #
+      # We didn't create it separately to avoid 2 cluster requests.
+      ksvc = read_services
+      pods = knative_client.discovered ? read_pods : []
+      { services: ksvc, pods: pods, knative_detected: knative_client.discovered }
+    end
+
+    def services
+      return [] unless search_namespace
+
+      cached_data = with_reactive_cache_memoized(*cache_args) { |data| data }
+      cached_data.to_h.fetch(:services, [])
+    end
+
+    def cache_args
+      [cluster.id, project.id]
+    end
+
+    def service_pod_details(service)
+      cached_data = with_reactive_cache_memoized(*cache_args) { |data| data }
+      cached_data.to_h.fetch(:pods, []).select do |pod|
+        filter_pods(pod, service)
+      end
+    end
+
+    def knative_detected
+      cached_data = with_reactive_cache_memoized(*cache_args) { |data| data }
+
+      knative_state = cached_data.to_h[:knative_detected]
+
+      return KNATIVE_STATES['checking'] if knative_state.nil?
+      return KNATIVE_STATES['installed'] if knative_state
+
+      KNATIVE_STATES['uninstalled']
+    end
+
+    def model_name
+      self.class.name.underscore.tr('/', '_')
+    end
+
+    private
+
+    def search_namespace
+      @search_namespace ||= cluster.kubernetes_namespace_for(project)
+    end
+
+    def knative_client
+      cluster.kubeclient.knative_client
+    end
+
+    def filter_pods(pod, service)
+      pod["metadata"]["labels"]["serving.knative.dev/service"] == service
+    end
+
+    def read_services
+      knative_client.get_services(namespace: search_namespace).as_json
+    rescue Kubeclient::ResourceNotFoundError
+      []
+    end
+
+    def read_pods
+      cluster.kubeclient.core_client.get_pods(namespace: search_namespace).as_json
+    end
+
+    def id
+      nil
+    end
+  end
+end

app/finders/projects/serverless/functions_finder.rb

@@ -14,15 +14,16 @@ module Projects
         knative_services.flatten.compact
       end
 
-      # Possible return values: Clusters::Cluster::KnativeServicesFinder::KNATIVE_STATE
+      # Possible return values: Clusters::KnativeServicesFinder::KNATIVE_STATE
       def knative_installed
         states = @clusters.map do |cluster|
+          cluster.application_knative
           cluster.knative_services_finder(project).knative_detected.tap do |state|
-            return state if state == ::Clusters::Cluster::KnativeServicesFinder::KNATIVE_STATES['checking'] # rubocop:disable Cop/AvoidReturnFromBlocks
+            return state if state == ::Clusters::KnativeServicesFinder::KNATIVE_STATES['checking'] # rubocop:disable Cop/AvoidReturnFromBlocks
           end
         end
 
-        states.any? { |state| state == ::Clusters::Cluster::KnativeServicesFinder::KNATIVE_STATES['installed'] }
+        states.any? { |state| state == ::Clusters::KnativeServicesFinder::KNATIVE_STATES['installed'] }
       end
 
       def service(environment_scope, name)

spec/finders/clusters/knative_services_finder_spec.rb

@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-describe Clusters::Cluster::KnativeServicesFinder do
+describe Clusters::KnativeServicesFinder do
   include KubernetesHelpers
   include ReactiveCachingHelpers
 

spec/models/clusters/cluster_spec.rb

@@ -40,7 +40,7 @@ describe Clusters::Cluster, :use_clean_rails_memory_store_caching do
 
   it do
     expect(subject.knative_services_finder(subject.project))
-      .to be_instance_of(Clusters::Cluster::KnativeServicesFinder)
+      .to be_instance_of(Clusters::KnativeServicesFinder)
   end
 
   describe '.enabled' do