ekristen/gcp-nuke

package resources

import (
    "context"
    "errors"
    "fmt"
    "github.com/gotidy/ptr"
    "github.com/sirupsen/logrus"
    "strings"

    "google.golang.org/api/iterator"

    compute "cloud.google.com/go/compute/apiv1"
    "cloud.google.com/go/compute/apiv1/computepb"

    "github.com/ekristen/libnuke/pkg/registry"
    "github.com/ekristen/libnuke/pkg/resource"
    "github.com/ekristen/libnuke/pkg/types"

    "github.com/ekristen/gcp-nuke/pkg/nuke"
)

const VPCSubnetResource = "VPCSubnet"

func init() {
    registry.Register(&registry.Registration{
        Name:   VPCSubnetResource,
        Scope:  nuke.Project,
        Lister: &VPCSubnetLister{},
    })
}

type VPCSubnetLister struct {
    svc *compute.SubnetworksClient
}

func (l *VPCSubnetLister) Close() {
    if l.svc != nil {
        l.svc.Close()
    }
}

func (l *VPCSubnetLister) List(ctx context.Context, o interface{}) ([]resource.Resource, error) {
    var resources []resource.Resource

    opts := o.(*nuke.ListerOpts)
    if err := opts.BeforeList(nuke.Regional, "compute.googleapis.com"); err != nil {
        return resources, err
    }

    if l.svc == nil {
        var err error
        l.svc, err = compute.NewSubnetworksRESTClient(ctx, opts.ClientOptions...)
        if err != nil {
            return nil, err
        }
    }

    req := &computepb.ListSubnetworksRequest{
        Project: *opts.Project,
        Region:  *opts.Region,
    }
    it := l.svc.List(ctx, req)
    for {
        resp, err := it.Next()
        if errors.Is(err, iterator.Done) {
            break
        }
        if err != nil {
            logrus.WithError(err).Error("unable to iterate networks")
            break
        }

        networkParts := strings.Split(resp.GetNetwork(), "/")
        networkName := networkParts[len(networkParts)-1]

        // TODO: query network to determine if auto-subnet
        resources = append(resources, &VPCSubnet{
            svc:       l.svc,
            Name:      resp.Name,
            project:   opts.Project,
            region:    opts.Region,
            Network:   ptr.String(networkName),
            IPV4Range: resp.IpCidrRange,
            IPV6Range: resp.Ipv6CidrRange,
        })
    }

    return resources, nil
}

type VPCSubnet struct {
    svc       *compute.SubnetworksClient
    project   *string
    region    *string
    Name      *string
    Network   *string
    IPV4Range *string
    IPV6Range *string
}

func (r *VPCSubnet) Filter() error {
    if *r.Name == "default" && strings.HasSuffix(*r.IPV4Range, "/20") {
        return fmt.Errorf("cannot remove default auto-subnet")
    }
    return nil
}

func (r *VPCSubnet) Remove(ctx context.Context) error {
    _, err := r.svc.Delete(ctx, &computepb.DeleteSubnetworkRequest{
        Project:    *r.project,
        Region:     *r.region,
        Subnetwork: *r.Name,
    })
    return err
}

func (r *VPCSubnet) Properties() types.Properties {
    return types.NewPropertiesFromStruct(r)
}

func (r *VPCSubnet) String() string {
    return *r.Name
}