[Revert the revert] Change ingress fetching to be isolated per provider

pkg/i2gw/ingress2gateway.go

@@ -17,18 +17,10 @@ limitations under the License.
 package i2gw
 
 import (
-	"bytes"
 	"context"
-	"errors"
 	"fmt"
-	"io"
-	"os"
 
-	networkingv1 "k8s.io/api/networking/v1"
-	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
-	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/util/validation/field"
-	kubeyaml "k8s.io/apimachinery/pkg/util/yaml"
 	"sigs.k8s.io/controller-runtime/pkg/client"
 	"sigs.k8s.io/controller-runtime/pkg/client/config"
 )
@@ -45,30 +37,19 @@ func ToGatewayAPIResources(ctx context.Context, namespace string, inputFile stri
 	}
 	cl = client.NewNamespacedClient(cl, namespace)
 
-	var ingresses networkingv1.IngressList
-
 	providerByName, err := constructProviders(&ProviderConf{
-		Client: cl,
+		Client:    cl,
+		Namespace: namespace,
 	}, providers)
 	if err != nil {
 		return nil, err
 	}
 
-	resources := InputResources{}
-
 	if inputFile != "" {
-		if err = ConstructIngressesFromFile(&ingresses, inputFile, namespace); err != nil {
-			return nil, fmt.Errorf("failed to read ingresses from file: %w", err)
-		}
-		resources.Ingresses = ingresses.Items
 		if err = readProviderResourcesFromFile(ctx, providerByName, inputFile); err != nil {
 			return nil, err
 		}
 	} else {
-		if err = ConstructIngressesFromCluster(ctx, cl, &ingresses); err != nil {
-			return nil, fmt.Errorf("failed to read ingresses from cluster: %w", err)
-		}
-		resources.Ingresses = ingresses.Items
 		if err = readProviderResourcesFromCluster(ctx, providerByName); err != nil {
 			return nil, err
 		}
@@ -79,7 +60,8 @@ func ToGatewayAPIResources(ctx context.Context, namespace string, inputFile stri
 		errs             field.ErrorList
 	)
 	for _, provider := range providerByName {
-		providerGatewayResources, conversionErrs := provider.ToGatewayAPI(resources)
+		// TODO(#113) Remove input resources from ToGatewayAPI function
+		providerGatewayResources, conversionErrs := provider.ToGatewayAPI(InputResources{})
 		errs = append(errs, conversionErrs...)
 		gatewayResources = append(gatewayResources, providerGatewayResources)
 	}
@@ -108,14 +90,6 @@ func readProviderResourcesFromCluster(ctx context.Context, providerByName map[Pr
 	return nil
 }
 
-func ConstructIngressesFromCluster(ctx context.Context, cl client.Client, ingressList *networkingv1.IngressList) error {
-	err := cl.List(ctx, ingressList)
-	if err != nil {
-		return fmt.Errorf("failed to get ingresses from the cluster: %w", err)
-	}
-	return nil
-}
-
 // constructProviders constructs a map of concrete Provider implementations
 // by their ProviderName.
 func constructProviders(conf *ProviderConf, providers []string) (map[ProviderName]Provider, error) {
@@ -133,83 +107,6 @@ func constructProviders(conf *ProviderConf, providers []string) (map[ProviderNam
 	return providerByName, nil
 }
 
-// ExtractObjectsFromReader extracts all objects from a reader,
-// which is created from YAML or JSON input files.
-// It retrieves all objects, including nested ones if they are contained within a list.
-func ExtractObjectsFromReader(reader io.Reader) ([]*unstructured.Unstructured, error) {
-	d := kubeyaml.NewYAMLOrJSONDecoder(reader, 4096)
-	var objs []*unstructured.Unstructured
-	for {
-		u := &unstructured.Unstructured{}
-		if err := d.Decode(&u); err != nil {
-			if errors.Is(err, io.EOF) {
-				break
-			}
-			return objs, fmt.Errorf("failed to unmarshal manifest: %w", err)
-		}
-		if u == nil {
-			continue
-		}
-		objs = append(objs, u)
-	}
-
-	finalObjs := []*unstructured.Unstructured{}
-	for _, obj := range objs {
-		tmpObjs := []*unstructured.Unstructured{}
-		if obj.IsList() {
-			err := obj.EachListItem(func(object runtime.Object) error {
-				unstructuredObj, ok := object.(*unstructured.Unstructured)
-				if ok {
-					tmpObjs = append(tmpObjs, unstructuredObj)
-					return nil
-				}
-				return fmt.Errorf("resource list item has unexpected type")
-			})
-			if err != nil {
-				return nil, err
-			}
-		} else {
-			tmpObjs = append(tmpObjs, obj)
-		}
-		finalObjs = append(finalObjs, tmpObjs...)
-	}
-
-	return finalObjs, nil
-}
-
-// ConstructIngressesFromFile reads the inputFile in either json/yaml formats,
-// then deserialize the file into Ingresses resources.
-// All ingresses will be pushed into the supplied IngressList for return.
-func ConstructIngressesFromFile(l *networkingv1.IngressList, inputFile string, namespace string) error {
-	stream, err := os.ReadFile(inputFile)
-	if err != nil {
-		return err
-	}
-
-	reader := bytes.NewReader(stream)
-	objs, err := ExtractObjectsFromReader(reader)
-	if err != nil {
-		return err
-	}
-
-	for _, f := range objs {
-		if namespace != "" && f.GetNamespace() != namespace {
-			continue
-		}
-		if !f.GroupVersionKind().Empty() && f.GroupVersionKind().Kind == "Ingress" {
-			var i networkingv1.Ingress
-			err = runtime.DefaultUnstructuredConverter.
-				FromUnstructured(f.UnstructuredContent(), &i)
-			if err != nil {
-				return err
-			}
-			l.Items = append(l.Items, i)
-		}
-
-	}
-	return nil
-}
-
 func aggregatedErrs(errs field.ErrorList) error {
 	errMsg := fmt.Errorf("\n# Encountered %d errors", len(errs))
 	for _, err := range errs {

pkg/i2gw/ingress2gateway_test.go

@@ -17,140 +17,13 @@ limitations under the License.
 package i2gw
 
 import (
-	"context"
 	"fmt"
 	"testing"
 
-	"github.com/google/go-cmp/cmp"
-	networkingv1 "k8s.io/api/networking/v1"
-	apiequality "k8s.io/apimachinery/pkg/api/equality"
-	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
 	"sigs.k8s.io/controller-runtime/pkg/client/fake"
 )
 
-func Test_constructIngressesFromFile(t *testing.T) {
-	ingress1 := ingress(443, "ingress1", "namespace1")
-	ingress2 := ingress(80, "ingress2", "namespace2")
-	ingressNoNamespace := ingress(80, "ingress-no-namespace", "")
-
-	testCases := []struct {
-		name            string
-		filePath        string
-		namespace       string
-		wantIngressList []networkingv1.Ingress
-	}{
-		{
-			name:            "Test yaml input file with multiple resources with no namespace flag",
-			filePath:        "testdata/input-file.yaml",
-			namespace:       "",
-			wantIngressList: []networkingv1.Ingress{ingress1, ingress2, ingressNoNamespace},
-		}, {
-			name:            "Test json input file with multiple resources with no namespace flag",
-			filePath:        "testdata/input-file.json",
-			namespace:       "",
-			wantIngressList: []networkingv1.Ingress{ingress1, ingress2, ingressNoNamespace},
-		}, {
-			name:            "Test yaml input file with multiple resources with namespace1 flag",
-			filePath:        "testdata/input-file.yaml",
-			namespace:       "namespace1",
-			wantIngressList: []networkingv1.Ingress{ingress1},
-		},
-	}
-
-	for _, tc := range testCases {
-		t.Run(tc.name, func(t *testing.T) {
-			gotIngressList := &networkingv1.IngressList{}
-			err := ConstructIngressesFromFile(gotIngressList, tc.filePath, tc.namespace)
-			if err != nil {
-				t.Errorf("Failed to open test file: %v", err)
-			}
-			compareIngressLists(t, gotIngressList, tc.wantIngressList)
-		})
-	}
-}
-
-func ingress(port int32, name, namespace string) networkingv1.Ingress {
-	iPrefix := networkingv1.PathTypePrefix
-	ingressClassName := fmt.Sprintf("ingressClass-%s", name)
-	var objMeta metav1.ObjectMeta
-	if namespace != "" {
-		objMeta = metav1.ObjectMeta{Name: name, ResourceVersion: "999", Namespace: namespace}
-	} else {
-		objMeta = metav1.ObjectMeta{Name: name, ResourceVersion: "999"}
-	}
-
-	ing := networkingv1.Ingress{
-		TypeMeta: metav1.TypeMeta{
-			Kind:       "Ingress",
-			APIVersion: "networking.k8s.io/v1",
-		},
-		ObjectMeta: objMeta,
-		Spec: networkingv1.IngressSpec{
-			IngressClassName: &ingressClassName,
-			Rules: []networkingv1.IngressRule{{
-				IngressRuleValue: networkingv1.IngressRuleValue{
-					HTTP: &networkingv1.HTTPIngressRuleValue{
-						Paths: []networkingv1.HTTPIngressPath{{
-							Path:     fmt.Sprintf("/path-%s", name),
-							PathType: &iPrefix,
-							Backend: networkingv1.IngressBackend{
-								Service: &networkingv1.IngressServiceBackend{
-									Name: fmt.Sprintf("service-%s", name),
-									Port: networkingv1.ServiceBackendPort{
-										Number: port,
-									},
-								},
-							},
-						}},
-					},
-				},
-			}},
-		},
-	}
-	return ing
-}
-
-func compareIngressLists(t *testing.T, gotIngressList *networkingv1.IngressList, wantIngressList []networkingv1.Ingress) {
-	for i, got := range gotIngressList.Items {
-		want := wantIngressList[i]
-		if !apiequality.Semantic.DeepEqual(got, want) {
-			t.Errorf("Expected Ingress %d to be %+v\n Got: %+v\n Diff: %s", i, want, got, cmp.Diff(want, got))
-		}
-	}
-}
-
-func Test_constructIngressesFromCluster(t *testing.T) {
-	ingress1 := ingress(443, "ingress1", "namespace1")
-	ingress2 := ingress(80, "ingress2", "namespace2")
-	testCases := []struct {
-		name          string
-		runtimeObjs   []runtime.Object
-		wantIngresses []networkingv1.Ingress
-	}{{
-		name:          "Test cluster client with 2 resources",
-		runtimeObjs:   []runtime.Object{&ingress1, &ingress2},
-		wantIngresses: []networkingv1.Ingress{ingress1, ingress2},
-	}, {
-		name:          "Test cluster client without resources",
-		runtimeObjs:   []runtime.Object{},
-		wantIngresses: []networkingv1.Ingress{},
-	},
-	}
-
-	for _, tc := range testCases {
-		t.Run(tc.name, func(t *testing.T) {
-			gotIngresses := &networkingv1.IngressList{}
-			cl := fake.NewClientBuilder().WithRuntimeObjects(tc.runtimeObjs...).Build()
-			err := ConstructIngressesFromCluster(context.Background(), cl, gotIngresses)
-			if err != nil {
-				t.Errorf("test failed unexpectedly: %v", err)
-			}
-			compareIngressLists(t, gotIngresses, tc.wantIngresses)
-		})
-	}
-}
-
 func Test_constructProviders(t *testing.T) {
 	supportProviders := []string{"ingress-nginx"}
 	for _, provider := range supportProviders {

pkg/i2gw/provider.go

@@ -42,7 +42,8 @@ type ProviderConstructor func(conf *ProviderConf) Provider
 // ProviderConf contains all the configuration required for every concrete
 // Provider implementation.
 type ProviderConf struct {
-	Client client.Client
+	Client    client.Client
+	Namespace string
 }
 
 // The Provider interface specifies the required functionality which needs to be