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cluster_store.go
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cluster_store.go
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//go:build !noetcd
package etcd
import (
"context"
"fmt"
"path"
"strconv"
"go.etcd.io/etcd/api/v3/mvccpb"
clientv3 "go.etcd.io/etcd/client/v3"
"go.uber.org/zap"
"google.golang.org/protobuf/encoding/protojson"
"k8s.io/client-go/util/retry"
corev1 "github.com/rancher/opni/pkg/apis/core/v1"
"github.com/rancher/opni/pkg/storage"
)
func (e *EtcdStore) CreateCluster(ctx context.Context, cluster *corev1.Cluster) error {
cluster.SetResourceVersion("")
data, err := protojson.Marshal(cluster)
if err != nil {
return fmt.Errorf("failed to marshal cluster: %w", err)
}
key := path.Join(e.Prefix, clusterKey, cluster.Id)
resp, err := e.Client.Txn(ctx).If(
clientv3.Compare(clientv3.Version(key), "=", 0),
).Then(
clientv3.OpPut(key, string(data)),
).Commit()
if err != nil {
return fmt.Errorf("failed to create cluster: %w", err)
}
if !resp.Succeeded {
return storage.ErrAlreadyExists
}
cluster.SetResourceVersion(fmt.Sprint(resp.Header.Revision))
return nil
}
func (e *EtcdStore) DeleteCluster(ctx context.Context, ref *corev1.Reference) error {
resp, err := e.Client.Delete(ctx, path.Join(e.Prefix, clusterKey, ref.Id))
if err != nil {
return fmt.Errorf("failed to delete cluster: %w", err)
}
if resp.Deleted == 0 {
return storage.ErrNotFound
}
return nil
}
func (e *EtcdStore) ListClusters(
ctx context.Context,
matchLabels *corev1.LabelSelector,
matchOptions corev1.MatchOptions,
) (*corev1.ClusterList, error) {
resp, err := e.Client.Get(ctx, path.Join(e.Prefix, clusterKey),
clientv3.WithPrefix(),
clientv3.WithSort(clientv3.SortByKey, clientv3.SortAscend))
if err != nil {
return nil, fmt.Errorf("failed to list clusters: %w", err)
}
clusters := &corev1.ClusterList{
Items: []*corev1.Cluster{},
}
selectorPredicate := storage.NewSelectorPredicate(&corev1.ClusterSelector{
LabelSelector: matchLabels,
MatchOptions: matchOptions,
})
for _, kv := range resp.Kvs {
cluster := &corev1.Cluster{}
if err := protojson.Unmarshal(kv.Value, cluster); err != nil {
return nil, fmt.Errorf("failed to unmarshal cluster: %w", err)
}
if selectorPredicate(cluster) {
cluster.SetResourceVersion(fmt.Sprint(kv.ModRevision))
clusters.Items = append(clusters.Items, cluster)
}
}
return clusters, nil
}
func (e *EtcdStore) GetCluster(ctx context.Context, ref *corev1.Reference) (*corev1.Cluster, error) {
resp, err := e.Client.Get(ctx, path.Join(e.Prefix, clusterKey, ref.Id))
if err != nil {
return nil, fmt.Errorf("failed to get cluster: %w", err)
}
if len(resp.Kvs) == 0 {
return nil, storage.ErrNotFound
}
cluster := &corev1.Cluster{}
if err := protojson.Unmarshal(resp.Kvs[0].Value, cluster); err != nil {
return nil, fmt.Errorf("failed to unmarshal cluster: %w", err)
}
cluster.SetResourceVersion(fmt.Sprint(resp.Kvs[0].ModRevision))
return cluster, nil
}
func (e *EtcdStore) UpdateCluster(
ctx context.Context,
ref *corev1.Reference,
mutator storage.MutatorFunc[*corev1.Cluster],
) (*corev1.Cluster, error) {
var retCluster *corev1.Cluster
err := retry.OnError(defaultBackoff, isRetryErr, func() error {
txn := e.Client.Txn(ctx)
key := path.Join(e.Prefix, clusterKey, ref.Id)
cluster, err := e.GetCluster(ctx, ref)
if err != nil {
return fmt.Errorf("failed to get cluster: %w", err)
}
revision, err := strconv.Atoi(cluster.GetResourceVersion())
if err != nil {
return fmt.Errorf("internal error: cluster has invalid resource version: %w", err)
}
mutator(cluster)
cluster.SetResourceVersion("")
data, err := protojson.Marshal(cluster)
if err != nil {
return fmt.Errorf("failed to marshal cluster: %w", err)
}
txnResp, err := txn.If(clientv3.Compare(clientv3.ModRevision(key), "=", revision)).
Then(clientv3.OpPut(key, string(data))).
Commit()
if err != nil {
e.Logger.With(
zap.Error(err),
).Error("error updating cluster")
return err
}
if !txnResp.Succeeded {
return retryErr
}
cluster.SetResourceVersion(fmt.Sprint(txnResp.Header.Revision))
retCluster = cluster
return nil
})
if err != nil {
return nil, err
}
return retCluster, nil
}
func (e *EtcdStore) WatchCluster(
ctx context.Context,
cluster *corev1.Cluster,
) (<-chan storage.WatchEvent[*corev1.Cluster], error) {
eventC := make(chan storage.WatchEvent[*corev1.Cluster], 10)
version, err := strconv.ParseInt(cluster.GetResourceVersion(), 10, 64)
if err != nil {
return nil, fmt.Errorf("failed to parse resource version: %w", err)
}
wc := e.Client.Watch(ctx, path.Join(e.Prefix, clusterKey, cluster.Id),
clientv3.WithPrevKV(),
clientv3.WithRev(version+1),
)
go func() {
defer close(eventC)
for {
select {
case <-ctx.Done():
return
case event := <-wc:
if event.Err() != nil {
e.Logger.With(
zap.Error(event.Err()),
).Error("error watching cluster")
return
}
for _, ev := range event.Events {
var eventType storage.WatchEventType
current := &corev1.Cluster{}
previous := &corev1.Cluster{}
switch ev.Type {
case mvccpb.DELETE:
eventType = storage.WatchEventDelete
case mvccpb.PUT:
eventType = storage.WatchEventUpdate
default:
continue
}
if ev.Kv.Version == 0 {
// deleted
current = nil
} else {
if err := protojson.Unmarshal(ev.Kv.Value, current); err != nil {
e.Logger.With(
zap.Error(err),
).Error("error unmarshaling cluster")
continue
}
current.SetResourceVersion(fmt.Sprint(ev.Kv.ModRevision))
}
// if we get here, version is > 1 or 0, therefore PrevKv will always be set
if err := protojson.Unmarshal(ev.PrevKv.Value, previous); err != nil {
e.Logger.With(
zap.Error(err),
).Error("error unmarshaling cluster")
continue
}
previous.SetResourceVersion(fmt.Sprint(ev.PrevKv.ModRevision))
eventC <- storage.WatchEvent[*corev1.Cluster]{
EventType: eventType,
Current: current,
Previous: previous,
}
}
}
}
}()
return eventC, nil
}
func (e *EtcdStore) WatchClusters(
ctx context.Context,
knownClusters []*corev1.Cluster,
) (<-chan storage.WatchEvent[*corev1.Cluster], error) {
resp, err := e.Client.Get(ctx, path.Join(e.Prefix, clusterKey), clientv3.WithPrefix())
if err != nil {
return nil, fmt.Errorf("failed to list clusters: %w", err)
}
startRev := resp.Header.Revision
knownClusterMap := make(map[string]*corev1.Cluster, len(knownClusters))
for _, cluster := range knownClusters {
knownClusterMap[cluster.Id] = cluster
}
initialEvents := make([]storage.WatchEvent[*corev1.Cluster], 0, len(resp.Kvs))
for _, kv := range resp.Kvs {
cluster := &corev1.Cluster{}
if err := protojson.Unmarshal(kv.Value, cluster); err != nil {
return nil, fmt.Errorf("failed to unmarshal cluster: %w", err)
}
cluster.SetResourceVersion(fmt.Sprint(kv.ModRevision))
if knownCluster, ok := knownClusterMap[cluster.Id]; !ok {
// cluster was not known
initialEvents = append(initialEvents, storage.WatchEvent[*corev1.Cluster]{
EventType: storage.WatchEventCreate,
Current: cluster,
})
} else if knownCluster.GetResourceVersion() != cluster.GetResourceVersion() {
// cluster was known, but resource version has changed
initialEvents = append(initialEvents, storage.WatchEvent[*corev1.Cluster]{
EventType: storage.WatchEventUpdate,
Current: cluster,
Previous: knownCluster,
})
}
}
bufSize := 100
for len(initialEvents) > bufSize {
bufSize *= 2
}
eventC := make(chan storage.WatchEvent[*corev1.Cluster], bufSize)
// send create or update events for unknown clusters
for _, event := range initialEvents {
eventC <- event
}
wc := e.Client.Watch(ctx, path.Join(e.Prefix, clusterKey),
clientv3.WithPrefix(),
clientv3.WithPrevKV(),
clientv3.WithRev(startRev+1),
)
go func() {
defer close(eventC)
for {
select {
case <-ctx.Done():
return
case event := <-wc:
if event.Err() != nil {
e.Logger.With(
zap.Error(event.Err()),
).Error("error watching clusters")
return
}
for _, ev := range event.Events {
var eventType storage.WatchEventType
current := &corev1.Cluster{}
previous := &corev1.Cluster{}
if ev.Type == mvccpb.DELETE {
eventType = storage.WatchEventDelete
}
if ev.IsCreate() {
// created
if err := protojson.Unmarshal(ev.Kv.Value, current); err != nil {
e.Logger.With(
zap.Error(err),
).Error("error unmarshaling cluster")
continue
}
current.SetResourceVersion(fmt.Sprint(ev.Kv.CreateRevision))
previous = nil
eventType = storage.WatchEventCreate
} else {
if ev.IsModify() {
if err := protojson.Unmarshal(ev.Kv.Value, current); err != nil {
e.Logger.With(
zap.Error(err),
).Error("error unmarshaling cluster")
continue
}
current.SetResourceVersion(fmt.Sprint(ev.Kv.ModRevision))
eventType = storage.WatchEventUpdate
} else {
// deleted
current = nil
}
// if we get here, version is > 1 or 0, therefore PrevKv will always be set
if err := protojson.Unmarshal(ev.PrevKv.Value, previous); err != nil {
e.Logger.With(
zap.Error(err),
).Error("error unmarshaling cluster")
continue
}
previous.SetResourceVersion(fmt.Sprint(ev.PrevKv.ModRevision))
}
eventC <- storage.WatchEvent[*corev1.Cluster]{
EventType: eventType,
Current: current,
Previous: previous,
}
}
}
}
}()
return eventC, nil
}