f6431c6138
When a pod is force-deleted UnprepareResources fails to get a claim from an API server. PrepareResources should cache claim info required by the UnprepareResources so that UnprepareResources would get it from the cache instead of querying API server.
153 lines
4.3 KiB
Go
153 lines
4.3 KiB
Go
/*
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Copyright 2023 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 state
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import (
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"fmt"
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"sync"
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resourcev1alpha2 "k8s.io/api/resource/v1alpha2"
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"k8s.io/apimachinery/pkg/types"
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"k8s.io/apimachinery/pkg/util/sets"
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"k8s.io/kubernetes/pkg/kubelet/checkpointmanager"
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"k8s.io/kubernetes/pkg/kubelet/checkpointmanager/errors"
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)
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var _ CheckpointState = &stateCheckpoint{}
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// CheckpointState interface provides to get and store state
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type CheckpointState interface {
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GetOrCreate() (ClaimInfoStateList, error)
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Store(ClaimInfoStateList) error
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}
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// ClaimInfoState is used to store claim info state in a checkpoint
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type ClaimInfoState struct {
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// Name of the DRA driver
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DriverName string
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// ClassName is a resource class of the claim
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ClassName string
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// ClaimUID is an UID of the resource claim
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ClaimUID types.UID
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// ClaimName is a name of the resource claim
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ClaimName string
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// Namespace is a claim namespace
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Namespace string
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// PodUIDs is a set of pod UIDs that reference a resource
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PodUIDs sets.Set[string]
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// ResourceHandles is a list of opaque resource data for processing by a specific kubelet plugin
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ResourceHandles []resourcev1alpha2.ResourceHandle
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// CDIDevices is a map of DriverName --> CDI devices returned by the
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// GRPC API call NodePrepareResource
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CDIDevices map[string][]string
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}
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// ClaimInfoStateWithoutResourceHandles is an old implementation of the ClaimInfoState
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// TODO: remove in Beta
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type ClaimInfoStateWithoutResourceHandles struct {
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// Name of the DRA driver
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DriverName string
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// ClassName is a resource class of the claim
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ClassName string
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// ClaimUID is an UID of the resource claim
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ClaimUID types.UID
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// ClaimName is a name of the resource claim
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ClaimName string
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// Namespace is a claim namespace
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Namespace string
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// PodUIDs is a set of pod UIDs that reference a resource
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PodUIDs sets.Set[string]
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// CDIDevices is a map of DriverName --> CDI devices returned by the
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// GRPC API call NodePrepareResource
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CDIDevices map[string][]string
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}
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type stateCheckpoint struct {
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sync.RWMutex
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checkpointManager checkpointmanager.CheckpointManager
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checkpointName string
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}
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// NewCheckpointState creates new State for keeping track of claim info with checkpoint backend
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func NewCheckpointState(stateDir, checkpointName string) (*stateCheckpoint, error) {
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if len(checkpointName) == 0 {
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return nil, fmt.Errorf("received empty string instead of checkpointName")
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}
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checkpointManager, err := checkpointmanager.NewCheckpointManager(stateDir)
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if err != nil {
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return nil, fmt.Errorf("failed to initialize checkpoint manager: %v", err)
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}
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stateCheckpoint := &stateCheckpoint{
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checkpointManager: checkpointManager,
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checkpointName: checkpointName,
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}
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return stateCheckpoint, nil
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}
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// get state from a checkpoint and creates it if it doesn't exist
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func (sc *stateCheckpoint) GetOrCreate() (ClaimInfoStateList, error) {
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sc.Lock()
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defer sc.Unlock()
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checkpoint := NewDRAManagerCheckpoint()
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err := sc.checkpointManager.GetCheckpoint(sc.checkpointName, checkpoint)
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if err == errors.ErrCheckpointNotFound {
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sc.store(ClaimInfoStateList{})
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return ClaimInfoStateList{}, nil
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}
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if err != nil {
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return nil, fmt.Errorf("failed to get checkpoint %v: %v", sc.checkpointName, err)
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}
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return checkpoint.Entries, nil
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}
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// saves state to a checkpoint
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func (sc *stateCheckpoint) Store(claimInfoStateList ClaimInfoStateList) error {
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sc.Lock()
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defer sc.Unlock()
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return sc.store(claimInfoStateList)
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}
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// saves state to a checkpoint, caller is responsible for locking
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func (sc *stateCheckpoint) store(claimInfoStateList ClaimInfoStateList) error {
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checkpoint := NewDRAManagerCheckpoint()
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checkpoint.Entries = claimInfoStateList
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err := sc.checkpointManager.CreateCheckpoint(sc.checkpointName, checkpoint)
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if err != nil {
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return fmt.Errorf("could not save checkpoint %s: %v", sc.checkpointName, err)
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}
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return nil
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}
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