ekristen/gcp-nuke

package resources

import (
    compute "cloud.google.com/go/compute/apiv1"
    "cloud.google.com/go/compute/apiv1/computepb"
    "context"
    "errors"
    "fmt"
    "github.com/ekristen/gcp-nuke/pkg/nuke"
    liberror "github.com/ekristen/libnuke/pkg/errors"
    "github.com/ekristen/libnuke/pkg/registry"
    "github.com/ekristen/libnuke/pkg/resource"
    "github.com/ekristen/libnuke/pkg/types"
    "github.com/sirupsen/logrus"
    "google.golang.org/api/iterator"
)

const VPCNetworkResource = "VPCNetwork"

func init() {
    registry.Register(&registry.Registration{
        Name:   VPCNetworkResource,
        Scope:  nuke.Project,
        Lister: &VPCNetworkLister{},
        DependsOn: []string{
            VPCSubnetResource,
            VPCRouteResource,
        },
    })
}

type VPCNetworkLister struct {
    svc *compute.NetworksClient
}

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

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

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

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

    req := &computepb.ListNetworksRequest{
        Project: *opts.Project,
    }
    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
        }

        resources = append(resources, &VPCNetwork{
            svc:     l.svc,
            project: opts.Project,
            Name:    resp.Name,
        })
    }

    return resources, nil
}

type VPCNetwork struct {
    svc      *compute.NetworksClient
    removeOp *compute.Operation
    project  *string
    Name     *string
}

func (r *VPCNetwork) Remove(ctx context.Context) error {
    var err error
    r.removeOp, err = r.svc.Delete(ctx, &computepb.DeleteNetworkRequest{
        Project: *r.project,
        Network: *r.Name,
    })
    if err != nil {
        return err
    }

    return r.HandleWait(ctx)
}

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

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

// HandleWait is a hook into the libnuke resource lifecycle to allow for waiting on a resource to be removed
// because certain GCP resources are async and require waiting for the operation to complete, this allows for
// polling of the operation until it is complete. Otherwise, remove is only called once and the resource is
// left in a permanent wait if the operation fails.
func (r *VPCNetwork) HandleWait(ctx context.Context) error {
    if r.removeOp == nil {
        return nil
    }

    if err := r.removeOp.Poll(ctx); err != nil {
        logrus.WithError(err).Trace("network remove op polling encountered error")
        return err
    }

    if !r.removeOp.Done() {
        return liberror.ErrWaitResource("waiting for operation to complete")
    }

    if r.removeOp.Done() {
        if r.removeOp.Proto().GetError() != nil {
            removeErr := fmt.Errorf("delete error on '%s': %s", r.removeOp.Proto().GetTargetLink(), r.removeOp.Proto().GetHttpErrorMessage())
            logrus.WithError(removeErr).WithField("status_code", r.removeOp.Proto().GetError()).Error("unable to delete network")
            return removeErr
        }
    }

    return nil
}