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role.go
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role.go
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// Copyright Project Contour Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package role
import (
"context"
"fmt"
equality "github.com/projectcontour/contour/internal/provisioner/equality"
"github.com/projectcontour/contour/internal/provisioner/labels"
"github.com/projectcontour/contour/internal/provisioner/model"
coordinationv1 "k8s.io/api/coordination/v1"
corev1 "k8s.io/api/core/v1"
rbacv1 "k8s.io/api/rbac/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/types"
"sigs.k8s.io/controller-runtime/pkg/client"
)
func ensureRole(ctx context.Context, cli client.Client, name string, contour *model.Contour, desired *rbacv1.Role) (*rbacv1.Role, error) {
current, err := CurrentRole(ctx, cli, contour.Namespace, name)
if err != nil {
if errors.IsNotFound(err) {
updated, err := createRole(ctx, cli, desired)
if err != nil {
return nil, fmt.Errorf("failed to create role %s/%s: %w", desired.Namespace, desired.Name, err)
}
return updated, nil
}
return nil, fmt.Errorf("failed to get role %s/%s: %w", desired.Namespace, desired.Name, err)
}
updated, err := updateRoleIfNeeded(ctx, cli, contour, current, desired)
if err != nil {
return nil, fmt.Errorf("failed to update role %s/%s: %w", desired.Namespace, desired.Name, err)
}
return updated, nil
}
// EnsureControllerRole ensures a Role resource exists with the for the Contour
// controller.
func EnsureControllerRole(ctx context.Context, cli client.Client, name string, contour *model.Contour) (*rbacv1.Role, error) {
return ensureRole(ctx, cli, name, contour, desiredControllerRole(name, contour))
}
// desiredControllerRole constructs an instance of the desired Role resource with the
// provided ns/name and contour namespace/name for the owning contour labels for
// the Contour controller.
func desiredControllerRole(name string, contour *model.Contour) *rbacv1.Role {
role := &rbacv1.Role{
TypeMeta: metav1.TypeMeta{
Kind: "Role",
},
ObjectMeta: metav1.ObjectMeta{
Namespace: contour.Namespace,
Name: name,
Labels: model.OwnerLabels(contour),
},
}
verbCGU := []string{"create", "get", "update"}
role.Rules = []rbacv1.PolicyRule{
{
Verbs: verbCGU,
APIGroups: []string{corev1.GroupName},
Resources: []string{"events"},
},
{
Verbs: verbCGU,
APIGroups: []string{coordinationv1.GroupName},
Resources: []string{"leases"},
},
}
return role
}
// CurrentRole returns the current Role for the provided ns/name.
func CurrentRole(ctx context.Context, cli client.Client, ns, name string) (*rbacv1.Role, error) {
current := &rbacv1.Role{}
key := types.NamespacedName{
Namespace: ns,
Name: name,
}
err := cli.Get(ctx, key, current)
if err != nil {
return nil, err
}
return current, nil
}
// createRole creates a Role resource for the provided role.
func createRole(ctx context.Context, cli client.Client, role *rbacv1.Role) (*rbacv1.Role, error) {
if err := cli.Create(ctx, role); err != nil {
return nil, fmt.Errorf("failed to create role %s/%s: %w", role.Namespace, role.Name, err)
}
return role, nil
}
// updateRoleIfNeeded updates a Role resource if current does not match desired,
// using contour to verify the existence of owner labels.
func updateRoleIfNeeded(ctx context.Context, cli client.Client, contour *model.Contour, current, desired *rbacv1.Role) (*rbacv1.Role, error) {
if labels.Exist(current, model.OwnerLabels(contour)) {
role, updated := equality.RoleConfigChanged(current, desired)
if updated {
if err := cli.Update(ctx, role); err != nil {
return nil, fmt.Errorf("failed to update cluster role %s/%s: %w", role.Namespace, role.Name, err)
}
return role, nil
}
}
return current, nil
}