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Allower to read cluster config directly from the k8s config-map (#484)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,132 @@ | ||
| // Copyright 2023 StreamNative, Inc. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package coordinator | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "io" | ||
| "log/slog" | ||
| "strings" | ||
|
|
||
| "github.com/pkg/errors" | ||
| "github.com/spf13/viper" | ||
| v1 "k8s.io/api/core/v1" //nolint:revive | ||
| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "k8s.io/apimachinery/pkg/watch" | ||
|
|
||
| "github.com/streamnative/oxia/common" | ||
| "github.com/streamnative/oxia/coordinator/impl" | ||
| ) | ||
|
|
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| type cmConfigProvider struct { | ||
| } | ||
|
|
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| const filePath = "config.yaml" | ||
|
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| func getNamespaceAndCmName(rp viper.RemoteProvider) (namespace, cmName string, err error) { | ||
| p := strings.Split(strings.TrimPrefix(rp.Path(), "configmap:"), "/") | ||
| if len(p) != 2 { | ||
| return "", "", errors.New("Invalid configmap configuration") | ||
| } | ||
|
|
||
| return p[0], p[1], nil | ||
| } | ||
|
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| func (*cmConfigProvider) Get(rp viper.RemoteProvider) (io.Reader, error) { | ||
| kubernetes := impl.NewK8SClientset(impl.NewK8SClientConfig()) | ||
| namespace, configmap, err := getNamespaceAndCmName(rp) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| cmValue, err := impl.K8SConfigMaps(kubernetes).Get(namespace, configmap) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
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| data, ok := cmValue.Data[filePath] | ||
| if !ok { | ||
| return nil, errors.Errorf("path not found in config map: %s", rp.Path()) | ||
| } | ||
| return bytes.NewReader([]byte(data)), nil | ||
| } | ||
|
|
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| func (c *cmConfigProvider) Watch(rp viper.RemoteProvider) (io.Reader, error) { | ||
| return c.Get(rp) | ||
| } | ||
|
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| func (*cmConfigProvider) WatchChannel(rp viper.RemoteProvider) (<-chan *viper.RemoteResponse, chan bool) { | ||
| kubernetes := impl.NewK8SClientset(impl.NewK8SClientConfig()) | ||
| namespace, configmap, _ := getNamespaceAndCmName(rp) | ||
|
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| ch := make(chan *viper.RemoteResponse) | ||
| w, err := kubernetes.CoreV1().ConfigMaps(namespace).Watch(context.Background(), metav1.ListOptions{}) | ||
| if err != nil { | ||
| slog.Error("Failed to setup watch on config map", | ||
| slog.String("k8s-namespace", namespace), | ||
| slog.String("k8s-config-map", configmap), | ||
| slog.Any("error", err)) | ||
| ch <- &viper.RemoteResponse{Error: err} | ||
| close(ch) | ||
| return ch, nil | ||
| } | ||
|
|
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| go common.DoWithLabels(context.Background(), map[string]string{ | ||
| "component": "k8s-configmap-watch", | ||
| }, func() { | ||
| for res := range w.ResultChan() { | ||
| cm, ok := res.Object.(*v1.ConfigMap) | ||
| if !ok { | ||
| slog.Warn("Got wrong type of object notification", | ||
| slog.String("k8s-namespace", namespace), | ||
| slog.String("k8s-config-map", configmap), | ||
| slog.Any("object", res), | ||
| ) | ||
| } | ||
| if cm.Name != configmap { | ||
| continue | ||
| } | ||
|
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| slog.Info("Got watch event from K8S", | ||
| slog.String("k8s-namespace", namespace), | ||
| slog.String("k8s-config-map", configmap), | ||
| slog.Any("event-type", res.Type), | ||
| ) | ||
|
|
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| switch res.Type { | ||
| case watch.Added, watch.Modified: | ||
| ch <- &viper.RemoteResponse{ | ||
| Value: []byte(cm.Data[filePath]), | ||
| Error: nil, | ||
| } | ||
|
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| // Also notifies directly the oxia coordinator | ||
| conf.ClusterConfigChangeNotifications <- nil | ||
| default: | ||
| ch <- &viper.RemoteResponse{ | ||
| Value: nil, | ||
| Error: errors.Errorf("unexpected event on config map: %v", res.Type), | ||
| } | ||
| } | ||
| } | ||
| }) | ||
|
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| return ch, nil | ||
| } | ||
|
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| func init() { | ||
| viper.RemoteConfig = &cmConfigProvider{} | ||
| viper.SupportedRemoteProviders = []string{"configmap"} | ||
| } |
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