/
runner.go
executable file
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/
runner.go
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/*
Copyright (c) 2019 VMware, Inc. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package plugin
import (
"context"
"github.com/pkg/errors"
"golang.org/x/sync/errgroup"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"github.com/kubenext/lissio/pkg/view/component"
)
// Runners is an interface that manager can call to get runners for a
// particular action.
type Runners interface {
// Print returns a runner for printing. The caller should close
// the channel when they are done with it.
Print(ManagerStore) (DefaultRunner, chan PrintResponse)
// Tab returns a runner for tabs. The caller should close
// the channel when they are done with it.
Tab(ManagerStore) (DefaultRunner, chan component.Tab)
// ObjectStatus returns a runner for object status. The caller should
// close the channel when they are done with it.
ObjectStatus(ManagerStore) (DefaultRunner, chan ObjectStatusResponse)
}
type defaultRunners struct{}
var _ Runners = (*defaultRunners)(nil)
func newDefaultRunners() *defaultRunners {
return &defaultRunners{}
}
func (dr *defaultRunners) Print(store ManagerStore) (DefaultRunner, chan PrintResponse) {
ch := make(chan PrintResponse)
return PrintRunner(store, ch), ch
}
func (dr *defaultRunners) Tab(store ManagerStore) (DefaultRunner, chan component.Tab) {
ch := make(chan component.Tab)
return TabRunner(store, ch), ch
}
func (dr *defaultRunners) ObjectStatus(store ManagerStore) (DefaultRunner, chan ObjectStatusResponse) {
ch := make(chan ObjectStatusResponse)
return ObjectStatusRunner(store, ch), ch
}
// DefaultRunner runs a function against all plugins
type DefaultRunner struct {
RunFunc func(ctx context.Context, name string, gvk schema.GroupVersionKind, object runtime.Object) error
}
// Run runs the runner for an object with the provided clients.
func (pr *DefaultRunner) Run(ctx context.Context, object runtime.Object, clientNames []string) error {
if err := pr.validate(object); err != nil {
return errors.Wrap(err, "plugin runner validate")
}
var g errgroup.Group
gvk := object.GetObjectKind().GroupVersionKind()
for _, name := range clientNames {
fn := func(name string) func() error {
return func() error {
if err := pr.RunFunc(ctx, name, gvk, object); err != nil {
return errors.Wrap(err, "running")
}
return nil
}
}
g.Go(fn(name))
}
if err := g.Wait(); err != nil {
return errors.Wrap(err, "handle object")
}
return nil
}
func (pr *DefaultRunner) validate(object runtime.Object) error {
if object == nil {
return errors.New("object is nil")
}
if pr.RunFunc == nil {
return errors.New("requires a runFunc")
}
return nil
}
// PrintRunner is a runner for printing.
func PrintRunner(store ManagerStore, ch chan<- PrintResponse) DefaultRunner {
return DefaultRunner{
RunFunc: func(ctx context.Context, name string, gvk schema.GroupVersionKind, object runtime.Object) error {
metadata, err := store.GetMetadata(name)
if err != nil {
return err
}
if !metadata.Capabilities.HasPrinterSupport(gvk) {
return nil
}
resp, err := printObject(ctx, store, name, object)
if err != nil {
return err
}
ch <- resp
return nil
},
}
}
func printObject(ctx context.Context, store ManagerStore, pluginName string, object runtime.Object) (PrintResponse, error) {
if store == nil {
return PrintResponse{}, errors.New("store is nil")
}
service, err := store.GetService(pluginName)
if err != nil {
return PrintResponse{}, err
}
resp, err := service.Print(ctx, object)
if err != nil {
return PrintResponse{}, errors.Wrapf(err, "print object with plugin %q", pluginName)
}
return resp, nil
}
// TabRunner is a runner for tabs.
func TabRunner(store ManagerStore, ch chan<- component.Tab) DefaultRunner {
runner := DefaultRunner{
RunFunc: func(ctx context.Context, name string, gvk schema.GroupVersionKind, object runtime.Object) error {
if store == nil {
return errors.New("store is nil")
}
metadata, err := store.GetMetadata(name)
if err != nil {
return err
}
if !metadata.Capabilities.HasTabSupport(gvk) {
return nil
}
service, err := store.GetService(name)
if err != nil {
return err
}
tabResponse, err := service.PrintTab(ctx, object)
if err != nil {
return errors.Wrapf(err, "printing tabResponse for plugin %q", name)
}
ch <- *tabResponse.Tab
return nil
},
}
return runner
}
// ObjectStatusRunner is a runner for object status.
func ObjectStatusRunner(store ManagerStore, ch chan<- ObjectStatusResponse) DefaultRunner {
return DefaultRunner{
RunFunc: func(ctx context.Context, name string, gvk schema.GroupVersionKind, object runtime.Object) error {
metadata, err := store.GetMetadata(name)
if err != nil {
return err
}
if !metadata.Capabilities.HasPrinterSupport(gvk) {
return nil
}
service, err := store.GetService(name)
if err != nil {
return err
}
resp, err := service.ObjectStatus(ctx, object)
if err != nil {
return errors.Wrapf(err, "print object status with plugin %q", name)
}
ch <- resp
return nil
},
}
}