/
informer.go
160 lines (122 loc) · 3.73 KB
/
informer.go
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package bbp
import (
"context"
"fmt"
"sync"
"time"
"github.com/go-logr/logr"
tfv1alpha2 "github.com/weaveworks/tf-controller/api/v1alpha2"
"github.com/weaveworks/tf-controller/internal/git/provider"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/dynamic/dynamicinformer"
"k8s.io/client-go/tools/cache"
"sigs.k8s.io/controller-runtime/pkg/client"
)
type Informer struct {
sharedInformer cache.SharedIndexInformer
handlers cache.ResourceEventHandlerFuncs
log logr.Logger
client client.Client
mux *sync.RWMutex
synced bool
}
func NewInformer(log logr.Logger, dynamicClient dynamic.Interface, clusterClient client.Client) (*Informer, error) {
restMapper := clusterClient.RESTMapper()
mapping, err := restMapper.RESTMapping(tfv1alpha2.GroupVersion.WithKind(tfv1alpha2.TerraformKind).GroupKind())
if err != nil {
log.Error(err, "failed to look up mapping for CRD")
return nil, err
}
factory := dynamicinformer.NewFilteredDynamicSharedInformerFactory(dynamicClient, time.Minute, corev1.NamespaceAll, nil)
informer := factory.ForResource(mapping.Resource).Informer()
return &Informer{
sharedInformer: informer,
mux: &sync.RWMutex{},
log: log,
synced: false,
client: clusterClient,
}, nil
}
func (i *Informer) Start(ctx context.Context) error {
if i.handlers.AddFunc == nil {
i.handlers.AddFunc = i.addHandler
}
if i.handlers.UpdateFunc == nil {
i.handlers.UpdateFunc = i.updateHandler
}
if i.handlers.DeleteFunc == nil {
i.handlers.DeleteFunc = i.deleteHandler
}
i.sharedInformer.AddEventHandler(i.handlers)
go i.sharedInformer.Run(ctx.Done())
isSynced := cache.WaitForCacheSync(ctx.Done(), i.sharedInformer.HasSynced)
i.mux.Lock()
i.synced = isSynced
i.mux.Unlock()
if !i.synced {
return fmt.Errorf("coudn't sync shared informer")
}
<-ctx.Done()
return nil
}
func (i *Informer) SetAddHandler(fn func(interface{})) {
i.handlers.AddFunc = fn
}
func (i *Informer) SetUpdateHandler(fn func(interface{}, interface{})) {
i.handlers.UpdateFunc = fn
}
func (i *Informer) SetDeleteHandler(fn func(interface{})) {
i.handlers.DeleteFunc = fn
}
const (
LabelKey = "infra.weave.works/branch-based-planner"
LabelValue = "true"
LabelPRIDKey string = "infra.weave.works/pr-id"
)
func (i *Informer) addHandler(obj interface{}) {}
func (i *Informer) updateHandler(_, newObj interface{}) {
if !i.synced {
return
}
i.mux.RLock()
defer i.mux.RUnlock()
current, ok := newObj.(*tfv1alpha2.Terraform)
if !ok {
i.log.Info("current object is not a Terraform object", "object", newObj)
return
}
if current.Labels[LabelKey] != LabelValue {
i.log.Info("Terraform object is not managed by the branch-based planner")
return
}
ctx := context.Background()
plan, err := i.getPlan(ctx, current)
if err != nil {
i.log.Error(err, "get plan output")
return
}
planOutput := plan.Data["tfplan"]
if len(planOutput) == 0 {
i.log.Info("Empty plan output")
return
}
gitProvider, err := provider.New(provider.ProviderGitHub)
if err != nil {
i.log.Error(err, "unable to get provider", "provider", "github")
return
}
gitProvider.AddCommentToPullRequest(ctx, provider.PullRequest{}, planOutput)
}
func (i *Informer) deleteHandler(obj interface{}) {}
func (i *Informer) getPlan(ctx context.Context, obj *tfv1alpha2.Terraform) (*corev1.Secret, error) {
secretName := types.NamespacedName{Namespace: obj.GetNamespace(), Name: "tfplan-" + obj.WorkspaceName() + "-" + obj.GetName()}
planSecret := &corev1.Secret{}
err := i.client.Get(ctx, secretName, planSecret)
if err != nil {
err = fmt.Errorf("error getting plan secret: %s", err)
return nil, err
}
return planSecret, nil
}