Golang etcd.InterpretDeleteError函数代码示例

// DeleteRoute deletes a Route specified by its ID.
func (registry *Etcd) DeleteRoute(ctx kapi.Context, routeID string) error {
	key, err := makeRouteKey(ctx, routeID)
	if err != nil {
		return err
	}
	err = registry.Delete(key, &api.Route{})
	return etcderr.InterpretDeleteError(err, "route", routeID)
}

// Delete removes the item from etcd.
func (e *Etcd) Delete(ctx api.Context, name string, options *api.DeleteOptions) (runtime.Object, error) {
	key, err := e.KeyFunc(ctx, name)
	if err != nil {
		return nil, err
	}

	obj := e.NewFunc()
	trace := util.NewTrace("Delete " + reflect.TypeOf(obj).String())
	defer trace.LogIfLong(time.Second)
	trace.Step("About to read object")
	if err := e.Storage.Get(key, obj, false); err != nil {
		return nil, etcderr.InterpretDeleteError(err, e.EndpointName, name)
	}

	// support older consumers of delete by treating "nil" as delete immediately
	if options == nil {
		options = api.NewDeleteOptions(0)
	}
	graceful, pendingGraceful, err := rest.BeforeDelete(e.DeleteStrategy, ctx, obj, options)
	if err != nil {
		return nil, err
	}
	if pendingGraceful {
		return e.finalizeDelete(obj, false)
	}
	if graceful && *options.GracePeriodSeconds != 0 {
		trace.Step("Graceful deletion")
		out := e.NewFunc()
		if err := e.Storage.Set(key, obj, out, uint64(*options.GracePeriodSeconds)); err != nil {
			return nil, etcderr.InterpretUpdateError(err, e.EndpointName, name)
		}
		return e.finalizeDelete(out, true)
	}

	// delete immediately, or no graceful deletion supported
	out := e.NewFunc()
	trace.Step("About to delete object")
	if err := e.Storage.Delete(key, out); err != nil {
		return nil, etcderr.InterpretDeleteError(err, e.EndpointName, name)
	}
	return e.finalizeDelete(out, true)
}

// DeleteService deletes a Service specified by its name.
func (r *Registry) DeleteService(ctx api.Context, name string) error {
	key, err := makeServiceKey(ctx, name)
	if err != nil {
		return err
	}
	err = r.RecursiveDelete(key, true)
	if err != nil {
		return etcderr.InterpretDeleteError(err, "service", name)
	}

	// TODO: can leave dangling endpoints, and potentially return incorrect
	// endpoints if a new service is created with the same name
	err = r.endpoints.DeleteEndpoints(ctx, name)
	if err != nil && !errors.IsNotFound(err) {
		return err
	}
	return nil
}

// Delete removes the item from etcd.
func (e *Etcd) Delete(ctx api.Context, name string, options *api.DeleteOptions) (runtime.Object, error) {
	key, err := e.KeyFunc(ctx, name)
	if err != nil {
		return nil, err
	}

	obj := e.NewFunc()
	trace := util.NewTrace("Delete " + reflect.TypeOf(obj).String())
	defer trace.LogIfLong(time.Second)
	trace.Step("About to read object")
	if err := e.Storage.Get(ctx, key, obj, false); err != nil {
		return nil, etcderr.InterpretDeleteError(err, e.EndpointName, name)
	}

	// support older consumers of delete by treating "nil" as delete immediately
	if options == nil {
		options = api.NewDeleteOptions(0)
	}
	graceful, pendingGraceful, err := rest.BeforeDelete(e.DeleteStrategy, ctx, obj, options)
	if err != nil {
		return nil, err
	}
	if pendingGraceful {
		return e.finalizeDelete(obj, false)
	}
	if graceful {
		trace.Step("Graceful deletion")
		out := e.NewFunc()
		lastGraceful := int64(0)
		err := e.Storage.GuaranteedUpdate(
			ctx, key, out, false,
			storage.SimpleUpdate(func(existing runtime.Object) (runtime.Object, error) {
				graceful, pendingGraceful, err := rest.BeforeDelete(e.DeleteStrategy, ctx, existing, options)
				if err != nil {
					return nil, err
				}
				if pendingGraceful {
					return nil, errAlreadyDeleting
				}
				if !graceful {
					return nil, errDeleteNow
				}
				lastGraceful = *options.GracePeriodSeconds
				return existing, nil
			}),
		)
		switch err {
		case nil:
			if lastGraceful > 0 {
				return out, nil
			}
			// fall through and delete immediately
		case errDeleteNow:
			// we've updated the object to have a zero grace period, or it's already at 0, so
			// we should fall through and truly delete the object.
		case errAlreadyDeleting:
			return e.finalizeDelete(obj, true)
		default:
			return nil, etcderr.InterpretUpdateError(err, e.EndpointName, name)
		}
	}

	// delete immediately, or no graceful deletion supported
	out := e.NewFunc()
	trace.Step("About to delete object")
	if err := e.Storage.Delete(ctx, key, out); err != nil {
		return nil, etcderr.InterpretDeleteError(err, e.EndpointName, name)
	}
	return e.finalizeDelete(out, true)
}

// Delete removes the item from etcd.
func (e *Etcd) Delete(ctx api.Context, name string, options *api.DeleteOptions) (runtime.Object, error) {
	key, err := e.KeyFunc(ctx, name)
	if err != nil {
		return nil, err
	}

	obj := e.NewFunc()
	if err := e.Storage.Get(ctx, key, obj, false); err != nil {
		return nil, etcderr.InterpretDeleteError(err, e.QualifiedResource, name)
	}

	// support older consumers of delete by treating "nil" as delete immediately
	if options == nil {
		options = api.NewDeleteOptions(0)
	}
	graceful, pendingGraceful, err := rest.BeforeDelete(e.DeleteStrategy, ctx, obj, options)
	if err != nil {
		return nil, err
	}
	if pendingGraceful {
		return e.finalizeDelete(obj, false)
	}
	var ignoreNotFound bool = false
	var lastExisting runtime.Object = nil
	if graceful {
		out := e.NewFunc()
		lastGraceful := int64(0)
		err := e.Storage.GuaranteedUpdate(
			ctx, key, out, false,
			storage.SimpleUpdate(func(existing runtime.Object) (runtime.Object, error) {
				graceful, pendingGraceful, err := rest.BeforeDelete(e.DeleteStrategy, ctx, existing, options)
				if err != nil {
					return nil, err
				}
				if pendingGraceful {
					return nil, errAlreadyDeleting
				}
				if !graceful {
					return nil, errDeleteNow
				}
				lastGraceful = *options.GracePeriodSeconds
				lastExisting = existing
				return existing, nil
			}),
		)
		switch err {
		case nil:
			if lastGraceful > 0 {
				return out, nil
			}
			// If we are here, the registry supports grace period mechanism and
			// we are intentionally delete gracelessly. In this case, we may
			// enter a race with other k8s components. If other component wins
			// the race, the object will not be found, and we should tolerate
			// the NotFound error. See
			// https://github.com/kubernetes/kubernetes/issues/19403 for
			// details.
			ignoreNotFound = true
			// exit the switch and delete immediately
		case errDeleteNow:
			// we've updated the object to have a zero grace period, or it's already at 0, so
			// we should fall through and truly delete the object.
		case errAlreadyDeleting:
			return e.finalizeDelete(obj, true)
		default:
			return nil, etcderr.InterpretUpdateError(err, e.QualifiedResource, name)
		}
	}

	// delete immediately, or no graceful deletion supported
	out := e.NewFunc()
	if err := e.Storage.Delete(ctx, key, out); err != nil {
		// Please refer to the place where we set ignoreNotFound for the reason
		// why we ignore the NotFound error .
		if storage.IsNotFound(err) && ignoreNotFound && lastExisting != nil {
			// The lastExisting object may not be the last state of the object
			// before its deletion, but it's the best approximation.
			return e.finalizeDelete(lastExisting, true)
		}
		return nil, etcderr.InterpretDeleteError(err, e.QualifiedResource, name)
	}
	return e.finalizeDelete(out, true)
}