Add cleanup for VPC load balancers

internal/ibmcloud-janitor/resources/types.go

@@ -45,6 +45,7 @@ var PowervsResources = []Resource{
 
 var VpcResources = []Resource{
 	VPCInstance{},
+	VPCLoadBalancer{},
 	VPCNetwork{},
 	VPCs{},
 }
@@ -74,6 +75,9 @@ type VPC interface {
 	GetSubnetPublicGateway(options *vpcv1.GetSubnetPublicGatewayOptions) (*vpcv1.PublicGateway, *core.DetailedResponse, error)
 	DeletePublicGateway(options *vpcv1.DeletePublicGatewayOptions) (*core.DetailedResponse, error)
 	UnsetSubnetPublicGateway(options *vpcv1.UnsetSubnetPublicGatewayOptions) (*core.DetailedResponse, error)
+	DeleteLoadBalancer(options *vpcv1.DeleteLoadBalancerOptions) (*core.DetailedResponse, error)
+	ListLoadBalancers(options *vpcv1.ListLoadBalancersOptions) (*vpcv1.LoadBalancerCollection, *core.DetailedResponse, error)
+	GetLoadBalancer(options *vpcv1.GetLoadBalancerOptions) (result *vpcv1.LoadBalancer, response *core.DetailedResponse, err error)
 }
 
 type ServiceIDClient interface {

internal/ibmcloud-janitor/resources/util.go

@@ -0,0 +1,67 @@
+/*
+Copyright 2022 The Kubernetes 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 resources
+
+import (
+	"net/url"
+
+	"github.com/pkg/errors"
+)
+
+// pagingHelper is used while listing resources. It parses and fetches the start token for
+// getting the next set of resources if nextURL is returned by func f.
+// func f has start as a parameter and returns the following:
+// isDone bool - true denotes that iterating is not needed as there is no next set of resources
+// nextURL string - denotes a URL for a page of resources which is parsed for fetching start token for next iteration
+// e error - will break and return error if e is not nil
+func pagingHelper(f func(string) (bool, string, error)) (err error) {
+	start := ""
+
+	getStartToken := func(nextURL string) (string, error) {
+		url, err := url.Parse(nextURL)
+		if err != nil || url == nil {
+			return "", errors.Wrapf(err, "failed to parse next url for getting next resources")
+		}
+
+		start := url.Query().Get("start")
+		return start, nil
+	}
+
+	for {
+		isDone, nextURL, e := f(start)
+
+		if e != nil {
+			err = e
+			break
+		}
+
+		if isDone {
+			break
+		}
+
+		if nextURL != "" {
+			start, err = getStartToken(nextURL)
+			if err != nil {
+				break
+			}
+		} else {
+			break
+		}
+	}
+
+	return
+}

internal/ibmcloud-janitor/resources/vpc_client.go

@@ -78,6 +78,18 @@ func (c *IBMVPCClient) UnsetSubnetPublicGateway(options *vpcv1.UnsetSubnetPublic
 	return c.vpcService.UnsetSubnetPublicGateway(options)
 }
 
+func (c *IBMVPCClient) DeleteLoadBalancer(options *vpcv1.DeleteLoadBalancerOptions) (*core.DetailedResponse, error) {
+	return c.vpcService.DeleteLoadBalancer(options)
+}
+
+func (c *IBMVPCClient) ListLoadBalancers(options *vpcv1.ListLoadBalancersOptions) (*vpcv1.LoadBalancerCollection, *core.DetailedResponse, error) {
+	return c.vpcService.ListLoadBalancers(options)
+}
+
+func (c *IBMVPCClient) GetLoadBalancer(options *vpcv1.GetLoadBalancerOptions) (result *vpcv1.LoadBalancer, response *core.DetailedResponse, err error) {
+	return c.vpcService.GetLoadBalancer(options)
+}
+
 // Creates a new VPC Client
 func NewVPCClient(options *CleanupOptions) (*IBMVPCClient, error) {
 	client := &IBMVPCClient{}

internal/ibmcloud-janitor/resources/vpc_lbs.go

@@ -0,0 +1,119 @@
+/*
+Copyright 2022 The Kubernetes 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 resources
+
+import (
+	"strings"
+	"time"
+
+	"github.com/IBM/vpc-go-sdk/vpcv1"
+	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
+	kerrors "k8s.io/apimachinery/pkg/util/errors"
+	"k8s.io/apimachinery/pkg/util/wait"
+)
+
+type VPCLoadBalancer struct{}
+
+var (
+	lbDeletionTimeout = time.Minute * 4
+	lbPollingInterval = time.Second * 30
+	resourceLogger    *logrus.Entry
+)
+
+// Cleans up the load balancers in a given region
+func (VPCLoadBalancer) cleanup(options *CleanupOptions) error {
+	resourceLogger = logrus.WithFields(logrus.Fields{"resource": options.Resource.Name})
+	resourceLogger.Info("Cleaning up the load balancers")
+	client, err := NewVPCClient(options)
+	if err != nil {
+		return errors.Wrap(err, "couldn't create VPC client")
+	}
+
+	var deletedLBList []string
+	var errs []error
+
+	f := func(start string) (bool, string, error) {
+		listLbOpts := &vpcv1.ListLoadBalancersOptions{}
+		if start != "" {
+			listLbOpts.Start = &start
+		}
+
+		loadBalancers, _, err := client.ListLoadBalancers(listLbOpts)
+		if err != nil {
+			return false, "", errors.Wrap(err, "failed to list the load balancers")
+		}
+
+		if loadBalancers == nil || len(loadBalancers.LoadBalancers) <= 0 {
+			resourceLogger.Info("there are no available load balancers to delete")
+			return true, "", nil
+		}
+
+		for _, lb := range loadBalancers.LoadBalancers {
+			if *lb.ResourceGroup.ID == client.ResourceGroupID {
+				if _, err := client.DeleteLoadBalancer(&vpcv1.DeleteLoadBalancerOptions{
+					ID: lb.ID,
+				}); err != nil {
+					resourceLogger.WithField("name", *lb.Name).Error("failed to delete load balancer")
+					errs = append(errs, err)
+					continue
+				}
+				deletedLBList = append(deletedLBList, *lb.ID)
+				resourceLogger.WithField("name", *lb.Name).Info("load balancer deletetion triggered")
+			}
+		}
+
+		if loadBalancers.Next != nil && *loadBalancers.Next.Href != "" {
+			return false, *loadBalancers.Next.Href, nil
+		}
+
+		return true, "", nil
+	}
+
+	if err = pagingHelper(f); err != nil {
+		errs = append(errs, errors.Wrapf(err, "failed to delete the load balancers"))
+	}
+
+	// check if the LBs are properly deleted
+	checkLBs(deletedLBList, client, &errs)
+
+	if len(errs) > 0 {
+		return kerrors.NewAggregate(errs)
+	}
+
+	resourceLogger.Info("Successfully deleted the load balancers")
+	return nil
+}
+
+func checkLBs(list []string, client *IBMVPCClient, errs *[]error) {
+	check := func(id string) error {
+		return wait.PollImmediate(lbPollingInterval, lbDeletionTimeout, func() (bool, error) {
+			_, _, err := client.GetLoadBalancer(&vpcv1.GetLoadBalancerOptions{ID: &id})
+			if err != nil && strings.Contains(err.Error(), "cannot be found") {
+				return true, nil
+			}
+			return false, err
+		})
+	}
+
+	for _, lb := range list {
+		if err := check(lb); err != nil {
+			resourceLogger.WithField("ID", lb).Error("failed to check the deletion of load balancer")
+			*errs = append(*errs, err)
+		}
+	}
+}