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event_persist.go
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event_persist.go
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package persist
import (
"context"
"fmt"
"github.com/pkg/errors"
v1 "k8s.io/api/core/v1"
apierr "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"github.com/argoproj/argo-events/common"
"github.com/argoproj/argo-events/pkg/apis/eventsource/v1alpha1"
)
type EventPersist interface {
Save(event *Event) error
Get(key string) (*Event, error)
IsEnabled() bool
}
type Event struct {
EventKey string
EventPayload string
}
type ConfigMapPersist struct {
ctx context.Context
kubeClient kubernetes.Interface
name string
namespace string
createIfNotExist bool
}
func createConfigmap(ctx context.Context, client kubernetes.Interface, name, namespace string) (*v1.ConfigMap, error) {
cm := v1.ConfigMap{}
cm.Name = name
cm.Namespace = namespace
return client.CoreV1().ConfigMaps(namespace).Create(ctx, &cm, metav1.CreateOptions{})
}
func NewConfigMapPersist(ctx context.Context, client kubernetes.Interface, configmap *v1alpha1.ConfigMapPersistence, namespace string) (EventPersist, error) {
if configmap == nil {
return nil, fmt.Errorf("persistence configuration is nil")
}
_, err := client.CoreV1().ConfigMaps(namespace).Get(ctx, configmap.Name, metav1.GetOptions{})
if err != nil {
if apierr.IsNotFound(err) && configmap.CreateIfNotExist {
_, err = createConfigmap(ctx, client, configmap.Name, namespace)
if err != nil {
if !apierr.IsAlreadyExists(err) {
return nil, err
}
}
} else {
return nil, err
}
}
cmp := ConfigMapPersist{
ctx: ctx,
kubeClient: client,
name: configmap.Name,
namespace: namespace,
createIfNotExist: configmap.CreateIfNotExist,
}
return &cmp, nil
}
func (cmp *ConfigMapPersist) IsEnabled() bool {
return true
}
func (cmp *ConfigMapPersist) Save(event *Event) error {
if event == nil {
return errors.Errorf("event object is nil")
}
// Using Connect util func for backoff retry if K8s API returns error
err := common.Connect(&common.DefaultBackoff, func() error {
cm, err := cmp.kubeClient.CoreV1().ConfigMaps(cmp.namespace).Get(cmp.ctx, cmp.name, metav1.GetOptions{})
if err != nil {
if apierr.IsNotFound(err) && cmp.createIfNotExist {
cm, err = createConfigmap(cmp.ctx, cmp.kubeClient, cmp.name, cmp.namespace)
if err != nil {
return err
}
} else {
return err
}
}
if len(cm.Data) == 0 {
cm.Data = make(map[string]string)
}
cm.Data[event.EventKey] = event.EventPayload
_, err = cmp.kubeClient.CoreV1().ConfigMaps(cmp.namespace).Update(cmp.ctx, cm, metav1.UpdateOptions{})
return err
})
if err != nil {
return err
}
return nil
}
func (cmp *ConfigMapPersist) Get(key string) (*Event, error) {
cm, err := cmp.kubeClient.CoreV1().ConfigMaps(cmp.namespace).Get(cmp.ctx, cmp.name, metav1.GetOptions{})
if err != nil {
if apierr.IsNotFound(err) {
return nil, nil
}
return nil, err
}
payload, exist := cm.Data[key]
if !exist {
return nil, nil
}
return &Event{EventKey: key, EventPayload: payload}, nil
}
type NullPersistence struct {
}
func (n *NullPersistence) Save(event *Event) error {
return nil
}
func (n *NullPersistence) Get(key string) (*Event, error) {
return nil, nil
}
func (cmp *NullPersistence) IsEnabled() bool {
return false
}