mirror of
https://github.com/ceph/ceph-csi.git
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482 lines
16 KiB
Go
482 lines
16 KiB
Go
/*
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Copyright 2017 The Kubernetes 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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http://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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package handlers
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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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"io"
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"net/http"
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"reflect"
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"k8s.io/apimachinery/pkg/api/errors"
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"k8s.io/apimachinery/pkg/api/meta"
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metainternalversionscheme "k8s.io/apimachinery/pkg/apis/meta/internalversion/scheme"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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metav1beta1 "k8s.io/apimachinery/pkg/apis/meta/v1beta1"
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"k8s.io/apimachinery/pkg/apis/meta/v1beta1/validation"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/apimachinery/pkg/runtime/schema"
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utilruntime "k8s.io/apimachinery/pkg/util/runtime"
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"k8s.io/apimachinery/pkg/watch"
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"k8s.io/apiserver/pkg/endpoints/handlers/negotiation"
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"k8s.io/apiserver/pkg/endpoints/handlers/responsewriters"
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"k8s.io/apiserver/pkg/endpoints/metrics"
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endpointsrequest "k8s.io/apiserver/pkg/endpoints/request"
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klog "k8s.io/klog/v2"
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)
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// watchEmbeddedEncoder performs encoding of the embedded object.
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//
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// NOTE: watchEmbeddedEncoder is NOT thread-safe.
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type watchEmbeddedEncoder struct {
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encoder runtime.Encoder
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ctx context.Context
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// target, if non-nil, configures transformation type.
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// The other options are ignored if target is nil.
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target *schema.GroupVersionKind
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tableOptions *metav1.TableOptions
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scope *RequestScope
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// identifier of the encoder, computed lazily
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identifier runtime.Identifier
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}
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func newWatchEmbeddedEncoder(ctx context.Context, encoder runtime.Encoder, target *schema.GroupVersionKind, tableOptions *metav1.TableOptions, scope *RequestScope) *watchEmbeddedEncoder {
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return &watchEmbeddedEncoder{
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encoder: encoder,
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ctx: ctx,
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target: target,
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tableOptions: tableOptions,
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scope: scope,
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}
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}
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// Encode implements runtime.Encoder interface.
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func (e *watchEmbeddedEncoder) Encode(obj runtime.Object, w io.Writer) error {
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if co, ok := obj.(runtime.CacheableObject); ok {
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return co.CacheEncode(e.Identifier(), e.doEncode, w)
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}
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return e.doEncode(obj, w)
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}
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func (e *watchEmbeddedEncoder) doEncode(obj runtime.Object, w io.Writer) error {
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result, err := doTransformObject(e.ctx, obj, e.tableOptions, e.target, e.scope)
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if err != nil {
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utilruntime.HandleError(fmt.Errorf("failed to transform object %v: %v", reflect.TypeOf(obj), err))
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result = obj
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}
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// When we are tranforming to a table, use the original table options when
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// we should print headers only on the first object - headers should be
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// omitted on subsequent events.
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if e.tableOptions != nil && !e.tableOptions.NoHeaders {
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e.tableOptions.NoHeaders = true
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// With options change, we should recompute the identifier.
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// Clearing this will trigger lazy recompute when needed.
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e.identifier = ""
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}
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return e.encoder.Encode(result, w)
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}
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// Identifier implements runtime.Encoder interface.
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func (e *watchEmbeddedEncoder) Identifier() runtime.Identifier {
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if e.identifier == "" {
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e.identifier = e.embeddedIdentifier()
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}
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return e.identifier
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}
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type watchEmbeddedEncoderIdentifier struct {
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Name string `json:"name,omitempty"`
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Encoder string `json:"encoder,omitempty"`
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Target string `json:"target,omitempty"`
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Options metav1.TableOptions `json:"options,omitempty"`
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NoHeaders bool `json:"noHeaders,omitempty"`
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}
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func (e *watchEmbeddedEncoder) embeddedIdentifier() runtime.Identifier {
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if e.target == nil {
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// If no conversion is performed, we effective only use
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// the embedded identifier.
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return e.encoder.Identifier()
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}
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identifier := watchEmbeddedEncoderIdentifier{
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Name: "watch-embedded",
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Encoder: string(e.encoder.Identifier()),
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Target: e.target.String(),
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}
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if e.target.Kind == "Table" && e.tableOptions != nil {
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identifier.Options = *e.tableOptions
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identifier.NoHeaders = e.tableOptions.NoHeaders
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}
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result, err := json.Marshal(identifier)
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if err != nil {
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klog.Fatalf("Failed marshaling identifier for watchEmbeddedEncoder: %v", err)
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}
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return runtime.Identifier(result)
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}
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// watchEncoder performs encoding of the watch events.
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//
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// NOTE: watchEncoder is NOT thread-safe.
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type watchEncoder struct {
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ctx context.Context
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kind schema.GroupVersionKind
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embeddedEncoder runtime.Encoder
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encoder runtime.Encoder
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framer io.Writer
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buffer runtime.Splice
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eventBuffer runtime.Splice
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currentEmbeddedIdentifier runtime.Identifier
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identifiers map[watch.EventType]runtime.Identifier
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}
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func newWatchEncoder(ctx context.Context, kind schema.GroupVersionKind, embeddedEncoder runtime.Encoder, encoder runtime.Encoder, framer io.Writer) *watchEncoder {
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return &watchEncoder{
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ctx: ctx,
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kind: kind,
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embeddedEncoder: embeddedEncoder,
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encoder: encoder,
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framer: framer,
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buffer: runtime.NewSpliceBuffer(),
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eventBuffer: runtime.NewSpliceBuffer(),
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}
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}
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// Encode encodes a given watch event.
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// NOTE: if events object is implementing the CacheableObject interface,
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//
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// the serialized version is cached in that object [not the event itself].
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func (e *watchEncoder) Encode(event watch.Event) error {
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encodeFunc := func(obj runtime.Object, w io.Writer) error {
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return e.doEncode(obj, event, w)
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}
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if co, ok := event.Object.(runtime.CacheableObject); ok {
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return co.CacheEncode(e.identifier(event.Type), encodeFunc, e.framer)
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}
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return encodeFunc(event.Object, e.framer)
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}
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func (e *watchEncoder) doEncode(obj runtime.Object, event watch.Event, w io.Writer) error {
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defer e.buffer.Reset()
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if err := e.embeddedEncoder.Encode(obj, e.buffer); err != nil {
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return fmt.Errorf("unable to encode watch object %T: %v", obj, err)
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}
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// ContentType is not required here because we are defaulting to the serializer type.
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outEvent := &metav1.WatchEvent{
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Type: string(event.Type),
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Object: runtime.RawExtension{Raw: e.buffer.Bytes()},
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}
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metrics.WatchEventsSizes.WithContext(e.ctx).WithLabelValues(e.kind.Group, e.kind.Version, e.kind.Kind).Observe(float64(len(outEvent.Object.Raw)))
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defer e.eventBuffer.Reset()
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if err := e.encoder.Encode(outEvent, e.eventBuffer); err != nil {
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return fmt.Errorf("unable to encode watch object %T: %v (%#v)", outEvent, err, e)
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}
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_, err := w.Write(e.eventBuffer.Bytes())
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return err
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}
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type watchEncoderIdentifier struct {
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Name string `json:"name,omitempty"`
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EmbeddedEncoder string `json:"embeddedEncoder,omitempty"`
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Encoder string `json:"encoder,omitempty"`
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EventType string `json:"eventType,omitempty"`
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}
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func (e *watchEncoder) identifier(eventType watch.EventType) runtime.Identifier {
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// We need to take into account that in embeddedEncoder includes table
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// transformer, then its identifier is dynamic. As a result, whenever
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// the identifier of embeddedEncoder changes, we need to invalidate the
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// whole identifiers cache.
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// TODO(wojtek-t): Can we optimize it somehow?
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if e.currentEmbeddedIdentifier != e.embeddedEncoder.Identifier() {
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e.currentEmbeddedIdentifier = e.embeddedEncoder.Identifier()
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e.identifiers = map[watch.EventType]runtime.Identifier{}
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}
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if _, ok := e.identifiers[eventType]; !ok {
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e.identifiers[eventType] = e.typeIdentifier(eventType)
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}
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return e.identifiers[eventType]
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}
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func (e *watchEncoder) typeIdentifier(eventType watch.EventType) runtime.Identifier {
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// The eventType is a non-standard pattern. This is coming from the fact
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// that we're effectively serializing the whole watch event, but storing
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// it in serializations of the Object within the watch event.
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identifier := watchEncoderIdentifier{
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Name: "watch",
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EmbeddedEncoder: string(e.embeddedEncoder.Identifier()),
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Encoder: string(e.encoder.Identifier()),
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EventType: string(eventType),
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}
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result, err := json.Marshal(identifier)
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if err != nil {
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klog.Fatalf("Failed marshaling identifier for watchEncoder: %v", err)
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}
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return runtime.Identifier(result)
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}
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// doTransformResponseObject is used for handling all requests, including watch.
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func doTransformObject(ctx context.Context, obj runtime.Object, opts interface{}, target *schema.GroupVersionKind, scope *RequestScope) (runtime.Object, error) {
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if _, ok := obj.(*metav1.Status); ok {
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return obj, nil
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}
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switch {
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case target == nil:
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// If we ever change that from a no-op, the identifier of
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// the watchEmbeddedEncoder has to be adjusted accordingly.
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return obj, nil
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case target.Kind == "PartialObjectMetadata":
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return asPartialObjectMetadata(obj, target.GroupVersion())
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case target.Kind == "PartialObjectMetadataList":
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return asPartialObjectMetadataList(obj, target.GroupVersion())
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case target.Kind == "Table":
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options, ok := opts.(*metav1.TableOptions)
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if !ok {
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return nil, fmt.Errorf("unexpected TableOptions, got %T", opts)
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}
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return asTable(ctx, obj, options, scope, target.GroupVersion())
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default:
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accepted, _ := negotiation.MediaTypesForSerializer(metainternalversionscheme.Codecs)
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err := negotiation.NewNotAcceptableError(accepted)
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return nil, err
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}
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}
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// optionsForTransform will load and validate any additional query parameter options for
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// a conversion or return an error.
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func optionsForTransform(mediaType negotiation.MediaTypeOptions, req *http.Request) (interface{}, error) {
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switch target := mediaType.Convert; {
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case target == nil:
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case target.Kind == "Table" && (target.GroupVersion() == metav1beta1.SchemeGroupVersion || target.GroupVersion() == metav1.SchemeGroupVersion):
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opts := &metav1.TableOptions{}
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if err := metainternalversionscheme.ParameterCodec.DecodeParameters(req.URL.Query(), metav1.SchemeGroupVersion, opts); err != nil {
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return nil, err
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}
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switch errs := validation.ValidateTableOptions(opts); len(errs) {
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case 0:
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return opts, nil
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case 1:
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return nil, errors.NewBadRequest(fmt.Sprintf("Unable to convert to Table as requested: %v", errs[0].Error()))
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default:
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return nil, errors.NewBadRequest(fmt.Sprintf("Unable to convert to Table as requested: %v", errs))
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}
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}
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return nil, nil
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}
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// targetEncodingForTransform returns the appropriate serializer for the input media type
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func targetEncodingForTransform(scope *RequestScope, mediaType negotiation.MediaTypeOptions, req *http.Request) (schema.GroupVersionKind, runtime.NegotiatedSerializer, bool) {
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switch target := mediaType.Convert; {
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case target == nil:
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case (target.Kind == "PartialObjectMetadata" || target.Kind == "PartialObjectMetadataList" || target.Kind == "Table") &&
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(target.GroupVersion() == metav1beta1.SchemeGroupVersion || target.GroupVersion() == metav1.SchemeGroupVersion):
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return *target, metainternalversionscheme.Codecs, true
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}
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return scope.Kind, scope.Serializer, false
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}
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// transformResponseObject takes an object loaded from storage and performs any necessary transformations.
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// Will write the complete response object.
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// transformResponseObject is used only for handling non-streaming requests.
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func transformResponseObject(ctx context.Context, scope *RequestScope, req *http.Request, w http.ResponseWriter, statusCode int, mediaType negotiation.MediaTypeOptions, result runtime.Object) {
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options, err := optionsForTransform(mediaType, req)
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if err != nil {
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scope.err(err, w, req)
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return
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}
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// ensure that for empty lists we don't return <nil> items.
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// This is safe to modify without deep-copying the object, as
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// List objects themselves are never cached.
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if meta.IsListType(result) && meta.LenList(result) == 0 {
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if err := meta.SetList(result, []runtime.Object{}); err != nil {
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scope.err(err, w, req)
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return
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}
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}
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var obj runtime.Object
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do := func() {
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obj, err = doTransformObject(ctx, result, options, mediaType.Convert, scope)
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}
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endpointsrequest.TrackTransformResponseObjectLatency(ctx, do)
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if err != nil {
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scope.err(err, w, req)
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return
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}
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kind, serializer, _ := targetEncodingForTransform(scope, mediaType, req)
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responsewriters.WriteObjectNegotiated(serializer, scope, kind.GroupVersion(), w, req, statusCode, obj, false)
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}
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// errNotAcceptable indicates Accept negotiation has failed
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type errNotAcceptable struct {
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message string
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}
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func newNotAcceptableError(message string) error {
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return errNotAcceptable{message}
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}
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func (e errNotAcceptable) Error() string {
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return e.message
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}
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func (e errNotAcceptable) Status() metav1.Status {
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return metav1.Status{
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Status: metav1.StatusFailure,
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Code: http.StatusNotAcceptable,
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Reason: metav1.StatusReason("NotAcceptable"),
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Message: e.Error(),
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}
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}
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func asTable(ctx context.Context, result runtime.Object, opts *metav1.TableOptions, scope *RequestScope, groupVersion schema.GroupVersion) (runtime.Object, error) {
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switch groupVersion {
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case metav1beta1.SchemeGroupVersion, metav1.SchemeGroupVersion:
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default:
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return nil, newNotAcceptableError(fmt.Sprintf("no Table exists in group version %s", groupVersion))
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}
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obj, err := scope.TableConvertor.ConvertToTable(ctx, result, opts)
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if err != nil {
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return nil, err
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}
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table := (*metav1.Table)(obj)
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for i := range table.Rows {
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item := &table.Rows[i]
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switch opts.IncludeObject {
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case metav1.IncludeObject:
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item.Object.Object, err = scope.Convertor.ConvertToVersion(item.Object.Object, scope.Kind.GroupVersion())
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if err != nil {
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return nil, err
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}
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// TODO: rely on defaulting for the value here?
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case metav1.IncludeMetadata, "":
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m, err := meta.Accessor(item.Object.Object)
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if err != nil {
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return nil, err
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}
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// TODO: turn this into an internal type and do conversion in order to get object kind automatically set?
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partial := meta.AsPartialObjectMetadata(m)
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partial.GetObjectKind().SetGroupVersionKind(groupVersion.WithKind("PartialObjectMetadata"))
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item.Object.Object = partial
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case metav1.IncludeNone:
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item.Object.Object = nil
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default:
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err = errors.NewBadRequest(fmt.Sprintf("unrecognized includeObject value: %q", opts.IncludeObject))
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return nil, err
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}
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}
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return table, nil
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}
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func asPartialObjectMetadata(result runtime.Object, groupVersion schema.GroupVersion) (runtime.Object, error) {
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if meta.IsListType(result) {
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err := newNotAcceptableError(fmt.Sprintf("you requested PartialObjectMetadata, but the requested object is a list (%T)", result))
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return nil, err
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}
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switch groupVersion {
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case metav1beta1.SchemeGroupVersion, metav1.SchemeGroupVersion:
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default:
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return nil, newNotAcceptableError(fmt.Sprintf("no PartialObjectMetadataList exists in group version %s", groupVersion))
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}
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m, err := meta.Accessor(result)
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if err != nil {
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return nil, err
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}
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partial := meta.AsPartialObjectMetadata(m)
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partial.GetObjectKind().SetGroupVersionKind(groupVersion.WithKind("PartialObjectMetadata"))
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return partial, nil
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}
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func asPartialObjectMetadataList(result runtime.Object, groupVersion schema.GroupVersion) (runtime.Object, error) {
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li, ok := result.(metav1.ListInterface)
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if !ok {
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return nil, newNotAcceptableError(fmt.Sprintf("you requested PartialObjectMetadataList, but the requested object is not a list (%T)", result))
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}
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gvk := groupVersion.WithKind("PartialObjectMetadata")
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switch {
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case groupVersion == metav1beta1.SchemeGroupVersion:
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list := &metav1beta1.PartialObjectMetadataList{}
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err := meta.EachListItem(result, func(obj runtime.Object) error {
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m, err := meta.Accessor(obj)
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if err != nil {
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return err
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}
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partial := meta.AsPartialObjectMetadata(m)
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partial.GetObjectKind().SetGroupVersionKind(gvk)
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list.Items = append(list.Items, *partial)
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return nil
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})
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if err != nil {
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return nil, err
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}
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list.ResourceVersion = li.GetResourceVersion()
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list.Continue = li.GetContinue()
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list.RemainingItemCount = li.GetRemainingItemCount()
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return list, nil
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case groupVersion == metav1.SchemeGroupVersion:
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list := &metav1.PartialObjectMetadataList{}
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err := meta.EachListItem(result, func(obj runtime.Object) error {
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m, err := meta.Accessor(obj)
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if err != nil {
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return err
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}
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partial := meta.AsPartialObjectMetadata(m)
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partial.GetObjectKind().SetGroupVersionKind(gvk)
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list.Items = append(list.Items, *partial)
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return nil
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})
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if err != nil {
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return nil, err
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}
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list.ResourceVersion = li.GetResourceVersion()
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list.Continue = li.GetContinue()
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list.RemainingItemCount = li.GetRemainingItemCount()
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return list, nil
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default:
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return nil, newNotAcceptableError(fmt.Sprintf("no PartialObjectMetadataList exists in group version %s", groupVersion))
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}
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}
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