141 lines
3.7 KiB
Go
141 lines
3.7 KiB
Go
package watch
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import (
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"errors"
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"fmt"
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"sync"
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"github.com/derailed/k9s/internal/k8s"
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"github.com/rs/zerolog/log"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/watch"
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"k8s.io/client-go/tools/cache"
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)
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// AllNamespaces designates all namespaces.
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const AllNamespaces = ""
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type (
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// Row represents a collection of string fields.
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Row []string
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// RowEvent represents a call for action after a resource reconciliation.
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// Tracks whether a resource got added, deleted or updated.
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RowEvent struct {
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Action watch.EventType
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Fields Row
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Deltas Row
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}
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// RowEvents tracks resource update events.
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RowEvents map[string]*RowEvent
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// TableData tracks a K8s resource for tabular display.
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TableData struct {
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Header Row
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Rows RowEvents
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Namespace string
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}
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)
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// TableListenerFn represents a table data listener.
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type TableListenerFn func(TableData)
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// StoreInformer an informer that allows listeners registration.
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type StoreInformer interface {
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cache.SharedIndexInformer
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Get(fqn string, opts metav1.GetOptions) (interface{}, error)
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List(ns string, opts metav1.ListOptions) k8s.Collection
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}
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// Informer represents a collection of cluster wide watchers.
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type Informer struct {
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informers map[string]StoreInformer
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client k8s.Connection
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podInformer *Pod
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listenerFn TableListenerFn
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initOnce sync.Once
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}
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// NewInformer creates a new cluster resource informer
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func NewInformer(client k8s.Connection, ns string) *Informer {
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log.Debug().Msgf(">> Starting Informer")
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i := Informer{client: client, informers: map[string]StoreInformer{}}
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_, err := client.CanIAccess("", "", "namespaces", []string{"list", "watch"})
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if err != nil && ns == AllNamespaces {
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log.Panic().Msg("Unauthorized: All namespaces. Missing verbs ['list', 'watch']. Please specify a namespace or correct RBAC")
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}
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// Namespace is locked in. check if user has auth for this ns access.
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if ns != AllNamespaces {
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acc, err := client.CanIAccess("", ns, "namespaces", []string{"get", "watch"})
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if err != nil {
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log.Panic().Err(err).Msgf("Failed access %s", ns)
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}
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if !acc {
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user, _ := client.Config().CurrentUserName()
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log.Panic().Msgf("Unauthorized: %s access to namespace %q is missing verbs ['get', 'watch']", user, ns)
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}
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i.init(ns)
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} else {
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i.init(AllNamespaces)
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}
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return &i
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}
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func (i *Informer) init(ns string) {
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i.initOnce.Do(func() {
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po := NewPod(i.client, ns)
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i.informers = map[string]StoreInformer{
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PodIndex: po,
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ContainerIndex: NewContainer(po),
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}
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if acc, err := i.client.CanIAccess("", "", "nodes", []string{"list", "watch"}); acc && err != nil {
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i.informers[NodeIndex] = NewNode(i.client)
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}
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if !i.client.HasMetrics() {
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return
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}
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if acc, err := i.client.CanIAccess("", ns, "metrics.k8s.io", []string{"list", "watch"}); acc && err != nil {
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i.informers[NodeMXIndex] = NewNodeMetrics(i.client)
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i.informers[PodMXIndex] = NewPodMetrics(i.client, ns)
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}
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})
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}
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// List items from store.
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func (i *Informer) List(res, ns string, opts metav1.ListOptions) (k8s.Collection, error) {
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if i == nil {
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return nil, errors.New("Invalid informer")
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}
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if i, ok := i.informers[res]; ok {
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return i.List(ns, opts), nil
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}
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return nil, fmt.Errorf("No informer found for resource %s:%q", res, ns)
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}
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// Get a resource by name.
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func (i *Informer) Get(res, fqn string, opts metav1.GetOptions) (interface{}, error) {
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if informer, ok := i.informers[res]; ok {
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return informer.Get(fqn, opts)
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}
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return nil, fmt.Errorf("No informer found for resource %s:%q", res, fqn)
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}
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// Run starts watching cluster resources.
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func (i *Informer) Run(closeCh <-chan struct{}) {
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for name := range i.informers {
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go func(si StoreInformer, c <-chan struct{}) {
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si.Run(c)
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}(i.informers[name], closeCh)
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}
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}
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