ekristen/gcp-nuke

package resources

import (
    "context"
    "errors"
    "fmt"

    "github.com/sirupsen/logrus"

    "google.golang.org/api/iterator"

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

    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/ekristen/gcp-nuke/pkg/nuke"
)

const ComputeBackendServiceResource = "ComputeBackendService"

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

type ComputeBackendServiceLister struct {
    svc       *compute.RegionBackendServicesClient
    globalSvc *compute.BackendServicesClient
}

func (l *ComputeBackendServiceLister) 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 {
        globalResources, err := l.listGlobal(ctx, opts)
        if err != nil {
            logrus.WithError(err).Error("unable to list global ssl certificates")
        } else {
            resources = append(resources, globalResources...)
        }
    }

    if err := opts.BeforeList(nuke.Regional, "compute.googleapis.com"); err == nil {
        regionalResources, err := l.listRegional(ctx, opts)
        if err != nil {
            logrus.WithError(err).Error("unable to list regional ssl certificates")
        } else {
            resources = append(resources, regionalResources...)
        }
    }

    return resources, nil
}

func (l *ComputeBackendServiceLister) listGlobal(ctx context.Context, opts *nuke.ListerOpts) ([]resource.Resource, error) {
    var resources []resource.Resource

    if l.globalSvc == nil {
        var err error
        l.globalSvc, err = compute.NewBackendServicesRESTClient(ctx)
        if err != nil {
            return nil, err
        }
    }

    req := &computepb.ListBackendServicesRequest{
        Project: *opts.Project,
    }
    it := l.globalSvc.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, &ComputeBackendService{
            globalSvc: l.globalSvc,
            project:   opts.Project,
            Name:      resp.Name,
        })
    }

    return resources, nil
}

func (l *ComputeBackendServiceLister) listRegional(ctx context.Context, opts *nuke.ListerOpts) ([]resource.Resource, error) {
    var resources []resource.Resource

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

    req := &computepb.ListRegionBackendServicesRequest{
        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
        }

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

    return resources, nil
}

type ComputeBackendService struct {
    svc       *compute.RegionBackendServicesClient
    globalSvc *compute.BackendServicesClient
    removeOp  *compute.Operation
    project   *string
    region    *string
    Name      *string
}

func (r *ComputeBackendService) Remove(ctx context.Context) error {
    if r.svc != nil {
        return r.removeRegion(ctx)
    } else if r.globalSvc != nil {
        return r.removeGlobal(ctx)
    }

    return errors.New("unable to determine service")
}

func (r *ComputeBackendService) removeGlobal(ctx context.Context) (err error) {
    r.removeOp, err = r.globalSvc.Delete(ctx, &computepb.DeleteBackendServiceRequest{
        Project:        *r.project,
        BackendService: *r.Name,
    })
    return err
}

func (r *ComputeBackendService) removeRegion(ctx context.Context) (err error) {
    r.removeOp, err = r.svc.Delete(ctx, &computepb.DeleteRegionBackendServiceRequest{
        Project:        *r.project,
        Region:         *r.region,
        BackendService: *r.Name,
    })
    return err
}

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

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

func (r *ComputeBackendService) HandleWait(ctx context.Context) error {
    if r.removeOp == nil {
        return nil
    }

    if err := r.removeOp.Poll(ctx); err != nil {
        logrus.WithError(err).Trace("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()).Errorf("unable to delete %s", ComputeBackendServiceResource)
            return removeErr
        }
    }

    return nil
}