mirror of https://github.com/knative/pkg.git
124 lines
3.4 KiB
Go
124 lines
3.4 KiB
Go
/*
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Copyright 2020 The Knative Authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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https://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// Simple abstraction for storing state on a k8s ConfigMap. Very very simple
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// and uses a single entry in the ConfigMap.data for storing serialized
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// JSON of the generic data that Load/Save uses. Handy for things like sources
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// that need to persist some state (checkpointing for example).
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package kvstore
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import (
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"context"
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"encoding/json"
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"fmt"
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corev1 "k8s.io/api/core/v1"
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apierrors "k8s.io/apimachinery/pkg/api/errors"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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v1 "k8s.io/client-go/kubernetes/typed/core/v1"
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"knative.dev/pkg/logging"
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)
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type configMapKVStore struct {
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cmClient v1.ConfigMapInterface
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name string
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namespace string
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data map[string]string
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}
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var (
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_ Interface = (*configMapKVStore)(nil)
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)
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func NewConfigMapKVStore(ctx context.Context, name string, namespace string, clientset v1.CoreV1Interface) Interface {
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return &configMapKVStore{name: name, namespace: namespace, cmClient: clientset.ConfigMaps(namespace)}
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}
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// Init initializes configMapKVStore either by loading or creating an empty one.
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func (cs *configMapKVStore) Init(ctx context.Context) error {
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l := logging.FromContext(ctx)
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l.Info("Initializing configMapKVStore...")
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err := cs.Load(ctx)
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if apierrors.IsNotFound(err) {
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l.Info("No config found, creating empty")
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return cs.createConfigMap()
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}
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return err
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}
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// Load fetches the ConfigMap from k8s and unmarshals the data found
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// in the configdatakey type as specified by value.
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func (cs *configMapKVStore) Load(ctx context.Context) error {
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cm, err := cs.cmClient.Get(cs.name, metav1.GetOptions{})
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if err != nil {
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return err
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}
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cs.data = cm.Data
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return nil
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}
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// Save takes the value given in, and marshals it into a string
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// and saves it into the k8s ConfigMap under the configdatakey.
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func (cs *configMapKVStore) Save(ctx context.Context) error {
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cm, err := cs.cmClient.Get(cs.name, metav1.GetOptions{})
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if err != nil {
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return err
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}
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cm.Data = cs.data
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_, err = cs.cmClient.Update(cm)
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return err
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}
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// Get retrieves and unmarshals the value from the map.
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func (cs *configMapKVStore) Get(ctx context.Context, key string, value interface{}) error {
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v, ok := cs.data[key]
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if !ok {
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return fmt.Errorf("key %s does not exist", key)
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}
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err := json.Unmarshal([]byte(v), value)
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if err != nil {
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return fmt.Errorf("Failed to Unmarshal %q: %v", v, err)
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}
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return nil
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}
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// Set marshals and sets the value given under specified key.
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func (cs *configMapKVStore) Set(ctx context.Context, key string, value interface{}) error {
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bytes, err := json.Marshal(value)
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if err != nil {
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return fmt.Errorf("Failed to Marshal: %v", err)
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}
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cs.data[key] = string(bytes)
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return nil
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}
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func (cs *configMapKVStore) createConfigMap() error {
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cm := &corev1.ConfigMap{
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TypeMeta: metav1.TypeMeta{
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APIVersion: "v1",
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Kind: "ConfigMap",
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},
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ObjectMeta: metav1.ObjectMeta{
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Name: cs.name,
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Namespace: cs.namespace,
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},
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}
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_, err := cs.cmClient.Create(cm)
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return err
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}
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