Add clustermap object and interface

This commit adds cluster map api object, cluster map
interface and it's implementation built on top of cluster map api
object.

Important note:
ClusterMap interface needs a method to identify namespace of the
cluster, it can't be a part of api object, because real source for
cluster namespace is cluster object from cluster-api upstream lib.
This will need further design discussion on how we will find
cluster-api kind: Cluster object in our manifests. For now, there
is dummy "default" namespace being used

Change-Id: I8175f54abbe77331f0c87c0bde50857ee5c0eb1d

pkg/k8s/kubeconfig/builder.go

@@ -17,11 +17,10 @@ package kubeconfig
 import (
 	"path/filepath"
 
-	"opendev.org/airship/airshipctl/pkg/api/v1alpha1"
+	"opendev.org/airship/airshipctl/pkg/cluster/clustermap"
 	"opendev.org/airship/airshipctl/pkg/config"
 	"opendev.org/airship/airshipctl/pkg/document"
 	"opendev.org/airship/airshipctl/pkg/errors"
-	"opendev.org/airship/airshipctl/pkg/log"
 	"opendev.org/airship/airshipctl/pkg/util"
 )
 
@@ -41,7 +40,7 @@ type Builder struct {
 	clusterName string
 	root        string
 
-	clusterMap *v1alpha1.ClusterMap
+	clusterMap clustermap.ClusterMap
 }
 
 // WithPath allows to set path to prexisting kubeconfig
@@ -57,7 +56,7 @@ func (b *Builder) WithBundle(bundlePath string) *Builder {
 }
 
 // WithClusterMap allows to set a parent cluster, that can be used to extract kubeconfig for target cluster
-func (b *Builder) WithClusterMap(cMap *v1alpha1.ClusterMap) *Builder {
+func (b *Builder) WithClusterMap(cMap clustermap.ClusterMap) *Builder {
 	b.clusterMap = cMap
 	return b
 }
@@ -101,16 +100,5 @@ func (b *Builder) fromParent() bool {
 	if b.clusterMap == nil {
 		return false
 	}
-	currentCluster, exists := b.clusterMap.Map[b.clusterName]
-	if !exists {
-		log.Debugf("cluster %s is not defined in cluster map %v", b.clusterName, b.clusterMap)
-		return false
-	}
-	// Check if DynamicKubeConfig is enabled, if so that means, we should get kubeconfig
-	// for this cluster from its parent
-	if currentCluster.Parent == "" || !currentCluster.DynamicKubeConfig {
-		log.Debugf("dynamic kubeconfig or parent cluster is not set for cluster %s", b.clusterName)
-		return false
-	}
-	return true
+	return b.clusterMap.DynamicKubeConfig(b.clusterName)
 }

pkg/k8s/kubeconfig/builder_test.go

@@ -23,6 +23,7 @@ import (
 	"github.com/stretchr/testify/require"
 
 	"opendev.org/airship/airshipctl/pkg/api/v1alpha1"
+	"opendev.org/airship/airshipctl/pkg/cluster/clustermap"
 	"opendev.org/airship/airshipctl/pkg/config"
 	"opendev.org/airship/airshipctl/pkg/k8s/kubeconfig"
 	"opendev.org/airship/airshipctl/pkg/util"
@@ -66,7 +67,7 @@ func TestBuilder(t *testing.T) {
 			},
 		}
 		builder := kubeconfig.NewBuilder().
-			WithClusterMap(clusterMap).
+			WithClusterMap(clustermap.NewClusterMap(clusterMap)).
 			WithClusterName(childCluster)
 		kube := builder.Build()
 		// This should not be implemented yet, and we need to check that we are getting there
@@ -81,7 +82,7 @@ func TestBuilder(t *testing.T) {
 	t.Run("No current cluster, fall to default", func(t *testing.T) {
 		clusterMap := &v1alpha1.ClusterMap{}
 		builder := kubeconfig.NewBuilder().
-			WithClusterMap(clusterMap).
+			WithClusterMap(clustermap.NewClusterMap(clusterMap)).
 			WithClusterName("some-cluster")
 		kube := builder.Build()
 		// We should get a default value for cluster since we don't have some-cluster set
@@ -92,7 +93,7 @@ func TestBuilder(t *testing.T) {
 		assert.Equal(t, path, actualPath)
 	})
 
-	t.Run("No parent cluster is defined, fall to default", func(t *testing.T) {
+	t.Run("Dynamic, but no parent", func(t *testing.T) {
 		childCluster := "child"
 		clusterMap := &v1alpha1.ClusterMap{
 			Map: map[string]*v1alpha1.Cluster{
@@ -102,15 +103,15 @@ func TestBuilder(t *testing.T) {
 			},
 		}
 		builder := kubeconfig.NewBuilder().
-			WithClusterMap(clusterMap).
+			WithClusterMap(clustermap.NewClusterMap(clusterMap)).
 			WithClusterName(childCluster)
 		kube := builder.Build()
 		// We should get a default value for cluster, as we can't find parent cluster
-		actualPath, cleanup, err := kube.GetFile()
-		defer cleanup()
-		require.NoError(t, err)
-		path := filepath.Join(util.UserHomeDir(), config.AirshipConfigDir, kubeconfig.KubeconfigDefaultFileName)
-		assert.Equal(t, path, actualPath)
+		filePath, cleanup, err := kube.GetFile()
+		require.Error(t, err)
+		require.Contains(t, err.Error(), "not implemented")
+		assert.Equal(t, "", filePath)
+		require.Nil(t, cleanup)
 	})
 
 	t.Run("Default source", func(t *testing.T) {
@@ -119,8 +120,8 @@ func TestBuilder(t *testing.T) {
 		// When ClusterMap is specified, but it doesn't have cluster-name defined, and no
 		// other sources provided,
 		actualPath, cleanup, err := kube.GetFile()
-		defer cleanup()
 		require.NoError(t, err)
+		defer cleanup()
 		path := filepath.Join(util.UserHomeDir(), config.AirshipConfigDir, kubeconfig.KubeconfigDefaultFileName)
 		assert.Equal(t, path, actualPath)
 	})