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Unify merge GetToList and List storage methods to single GetList

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This commit is contained in:
Wojciech Tyczyński 2022-02-10 10:15:29 +01:00
parent 3016b3d8f8
commit f3d56369f7
9 changed files with 30 additions and 60 deletions
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4
staging/src/k8s.io/apiserver/pkg/registry/generic/registry/dryrun.go
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@ -64,10 +64,6 @@ func (s *DryRunnableStorage) Get(ctx context.Context, key string, opts storage.G
return s.Storage.Get(ctx, key, opts, objPtr)
}
func (s *DryRunnableStorage) GetToList(ctx context.Context, key string, opts storage.ListOptions, listObj runtime.Object) error {
return s.Storage.GetToList(ctx, key, opts, listObj)
}
func (s *DryRunnableStorage) GetList(ctx context.Context, key string, opts storage.ListOptions, listObj runtime.Object) error {
return s.Storage.GetList(ctx, key, opts, listObj)
}

2
staging/src/k8s.io/apiserver/pkg/registry/generic/registry/store.go
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@ -352,7 +352,7 @@ func (e *Store) ListPredicate(ctx context.Context, p storage.SelectionPredicate,
if name, ok := p.MatchesSingle(); ok {
if key, err := e.KeyFunc(ctx, name); err == nil {
storageOpts.Recursive = false
err := e.Storage.GetToList(ctx, key, storageOpts, list)
err := e.Storage.GetList(ctx, key, storageOpts, list)
return list, storeerr.InterpretListError(err, qualifiedResource)
}
// if we cannot extract a key based on the current context, the optimization is skipped

25
staging/src/k8s.io/apiserver/pkg/storage/cacher/cacher.go
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@ -604,23 +604,6 @@ func shouldDelegateList(opts storage.ListOptions) bool {
return resourceVersion == "" || hasContinuation || hasLimit || opts.ResourceVersionMatch == metav1.ResourceVersionMatchExact
}
// GetToList implements storage.Interface.
func (c *Cacher) GetToList(ctx context.Context, key string, opts storage.ListOptions, listObj runtime.Object) error {
return c.list(ctx, key, opts, listObj, false)
}
// GetList implements storage.Interface.
func (c *Cacher) GetList(ctx context.Context, key string, opts storage.ListOptions, listObj runtime.Object) error {
return c.list(ctx, key, opts, listObj, true)
}
func (c *Cacher) delegateList(ctx context.Context, key string, opts storage.ListOptions, listObj runtime.Object, recursive bool) error {
if !recursive {
return c.storage.GetToList(ctx, key, opts, listObj)
}
return c.storage.List(ctx, key, opts, listObj)
}
func (c *Cacher) listItems(listRV uint64, key string, pred storage.SelectionPredicate, trace *utiltrace.Trace, recursive bool) ([]interface{}, uint64, string, error) {
if !recursive {
obj, exists, readResourceVersion, err := c.watchCache.WaitUntilFreshAndGet(listRV, key, trace)
@ -635,11 +618,13 @@ func (c *Cacher) listItems(listRV uint64, key string, pred storage.SelectionPred
return c.watchCache.WaitUntilFreshAndList(listRV, pred.MatcherIndex(), trace)
}
func (c *Cacher) list(ctx context.Context, key string, opts storage.ListOptions, listObj runtime.Object, recursive bool) error {
// GetList implements storage.Interface
func (c *Cacher) GetList(ctx context.Context, key string, opts storage.ListOptions, listObj runtime.Object) error {
recursive := opts.Recursive
resourceVersion := opts.ResourceVersion
pred := opts.Predicate
if shouldDelegateList(opts) {
return c.delegateList(ctx, key, opts, listObj, recursive)
return c.storage.GetList(ctx, key, opts, listObj)
}
// If resourceVersion is specified, serve it from cache.
@ -653,7 +638,7 @@ func (c *Cacher) list(ctx context.Context, key string, opts storage.ListOptions,
if listRV == 0 && !c.ready.check() {
// If Cacher is not yet initialized and we don't require any specific
// minimal resource version, simply forward the request to storage.
return c.delegateList(ctx, key, opts, listObj, recursive)
return c.storage.GetList(ctx, key, opts, listObj)
}
trace := utiltrace.New("cacher list", utiltrace.Field{Key: "type", Value: c.objectType.String()})

13
staging/src/k8s.io/apiserver/pkg/storage/cacher/cacher_whitebox_test.go
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@ -311,9 +311,6 @@ func (d *dummyStorage) Watch(_ context.Context, _ string, _ storage.ListOptions)
func (d *dummyStorage) Get(_ context.Context, _ string, _ storage.GetOptions, _ runtime.Object) error {
return d.err
}
func (d *dummyStorage) GetToList(_ context.Context, _ string, _ storage.ListOptions, _ runtime.Object) error {
return d.err
}
func (d *dummyStorage) GetList(_ context.Context, _ string, _ storage.ListOptions, listObj runtime.Object) error {
podList := listObj.(*example.PodList)
podList.ListMeta = metav1.ListMeta{ResourceVersion: "100"}
@ -363,7 +360,7 @@ func TestGetListCacheBypass(t *testing.T) {
}
}
func TestGetToListCacheBypass(t *testing.T) {
func TestGetListNonRecursiveCacheBypass(t *testing.T) {
backingStorage := &dummyStorage{}
cacher, _, err := newTestCacher(backingStorage)
if err != nil {
@ -381,20 +378,20 @@ func TestGetToListCacheBypass(t *testing.T) {
// Inject error to underlying layer and check if cacher is not bypassed.
backingStorage.err = errDummy
err = cacher.GetToList(context.TODO(), "pods/ns", storage.ListOptions{
err = cacher.GetList(context.TODO(), "pods/ns", storage.ListOptions{
ResourceVersion: "0",
Predicate: pred,
}, result)
if err != nil {
t.Errorf("GetToList with Limit and RV=0 should be served from cache: %v", err)
t.Errorf("GetList with Limit and RV=0 should be served from cache: %v", err)
}
err = cacher.GetToList(context.TODO(), "pods/ns", storage.ListOptions{
err = cacher.GetList(context.TODO(), "pods/ns", storage.ListOptions{
ResourceVersion: "",
Predicate: pred,
}, result)
if err != errDummy {
t.Errorf("List with Limit without RV=0 should bypass cacher: %v", err)
t.Errorf("GetList with Limit without RV=0 should bypass cacher: %v", err)
}
}

10
staging/src/k8s.io/apiserver/pkg/storage/etcd3/store.go
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@ -456,11 +456,6 @@ func (s *store) GuaranteedUpdate(
}
}
// GetToList implements storage.Interface.GetToList.
func (s *store) GetToList(ctx context.Context, key string, listOpts storage.ListOptions, listObj runtime.Object) error {
return s.list(ctx, key, listOpts, listObj, false)
}
func getNewItemFunc(listObj runtime.Object, v reflect.Value) func() runtime.Object {
// For unstructured lists with a target group/version, preserve the group/version in the instantiated list items
if unstructuredList, isUnstructured := listObj.(*unstructured.UnstructuredList); isUnstructured {
@ -559,10 +554,7 @@ func encodeContinue(key, keyPrefix string, resourceVersion int64) (string, error
// GetList implements storage.Interface.
func (s *store) GetList(ctx context.Context, key string, opts storage.ListOptions, listObj runtime.Object) error {
return s.list(ctx, key, opts, listObj, true)
}
func (s *store) list(ctx context.Context, key string, opts storage.ListOptions, listObj runtime.Object, recursive bool) error {
recursive := opts.Recursive
resourceVersion := opts.ResourceVersion
match := opts.ResourceVersionMatch
pred := opts.Predicate

12
staging/src/k8s.io/apiserver/pkg/storage/etcd3/store_test.go
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@ -541,7 +541,7 @@ func TestPreconditionalDeleteWithSuggestion(t *testing.T) {
}
}
func TestGetToList(t *testing.T) {
func TestGetListNonRecursive(t *testing.T) {
ctx, store, _ := testSetup(t)
prevKey, prevStoredObj := testPropogateStore(ctx, t, store, &example.Pod{ObjectMeta: metav1.ObjectMeta{Name: "prev"}})
@ -640,7 +640,13 @@ func TestGetToList(t *testing.T) {
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
out := &example.PodList{}
err := store.GetToList(ctx, tt.key, storage.ListOptions{ResourceVersion: tt.rv, ResourceVersionMatch: tt.rvMatch, Predicate: tt.pred}, out)
storageOpts := storage.ListOptions{
ResourceVersion: tt.rv,
ResourceVersionMatch: tt.rvMatch,
Predicate: tt.pred,
Recursive: false,
}
err := store.GetList(ctx, tt.key, storageOpts, out)
if tt.expectRVTooLarge {
if err == nil || !storage.IsTooLargeResourceVersion(err) {
@ -650,7 +656,7 @@ func TestGetToList(t *testing.T) {
}
if err != nil {
t.Fatalf("%s: GetToList failed: %v", tt.name, err)
t.Fatalf("GetList failed: %v", err)
}
if len(out.ResourceVersion) == 0 {
t.Errorf("%s: unset resourceVersion", tt.name)

10
staging/src/k8s.io/apiserver/pkg/storage/interfaces.go
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@ -190,12 +190,6 @@ type Interface interface {
// match 'opts.ResourceVersion' according 'opts.ResourceVersionMatch'.
Get(ctx context.Context, key string, opts GetOptions, objPtr runtime.Object) error
// GetToList unmarshals json found at key and opaque it into *List api object
// (an object that satisfies the runtime.IsList definition).
// The returned contents may be delayed, but it is guaranteed that they will
// match 'opts.ResourceVersion' according 'opts.ResourceVersionMatch'.
GetToList(ctx context.Context, key string, opts ListOptions, listObj runtime.Object) error
// GetList unmarshalls objects found at key into a *List api object (an object
// that satisfies runtime.IsList definition).
// If 'opts.Recursive' is false, 'key' is used as an exact match. If `opts.Recursive'
@ -267,8 +261,8 @@ type ListOptions struct {
ResourceVersionMatch metav1.ResourceVersionMatch
// Predicate provides the selection rules for the list operation.
Predicate SelectionPredicate
// Recursive determines whether the watch is defined for a single object or for the whole set
// of objects. The option is ignored for non-watch requests.
// Recursive determines whether the list or watch is defined for a single object located at the
// given key, or for the whole set of objects with the given key as a prefix.
Recursive bool
// ProgressNotify determines whether storage-originated bookmark (progress notify) events should
// be delivered to the users. The option is ignored for non-watch requests.

12
staging/src/k8s.io/apiserver/pkg/storage/tests/cacher_test.go
View File

@ -196,7 +196,7 @@ func TestGet(t *testing.T) {
}
}
func TestGetToList(t *testing.T) {
func TestGetListNonRecursive(t *testing.T) {
server, etcdStorage := newEtcdTestStorage(t, etcd3testing.PathPrefix())
defer server.Terminate(t)
cacher, _, err := newTestCacher(etcdStorage)
@ -212,15 +212,15 @@ func TestGetToList(t *testing.T) {
key string
pred storage.SelectionPredicate
expectedOut []*example.Pod
}{{ // test GetToList on existing key
}{{ // test non-recursive GetList on existing key
key: key,
pred: storage.Everything,
expectedOut: []*example.Pod{storedObj},
}, { // test GetToList on non-existing key
}, { // test non-recursive GetList on non-existing key
key: "/non-existing",
pred: storage.Everything,
expectedOut: nil,
}, { // test GetToList with matching pod name
}, { // test non-recursive GetList with matching pod name
key: "/non-existing",
pred: storage.SelectionPredicate{
Label: labels.Everything(),
@ -235,9 +235,9 @@ func TestGetToList(t *testing.T) {
for i, tt := range tests {
out := &example.PodList{}
err := cacher.GetToList(context.TODO(), tt.key, storage.ListOptions{Predicate: tt.pred}, out)
err := cacher.GetList(context.TODO(), tt.key, storage.ListOptions{Predicate: tt.pred, Recursive: false}, out)
if err != nil {
t.Fatalf("GetToList failed: %v", err)
t.Fatalf("GetList failed: %v", err)
}
if len(out.ResourceVersion) == 0 {
t.Errorf("#%d: unset resourceVersion", i)

2
test/integration/apiserver/apiserver_test.go
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@ -561,7 +561,7 @@ func testListOptionsCase(t *testing.T, rsClient appsv1.ReplicaSetInterface, watc
}
count := int64(len(items))
// Cacher.GetToList defines this for logic to decide if the watch cache is skipped. We need to know it to know if
// Cacher.GetList defines this for logic to decide if the watch cache is skipped. We need to know it to know if
// the limit is respected when testing here.
pagingEnabled := utilfeature.DefaultFeatureGate.Enabled(features.APIListChunking)
hasContinuation := pagingEnabled && len(opts.Continue) > 0