mirror of
https://github.com/kubernetes-sigs/node-feature-discovery.git
synced 2024-12-15 17:50:49 +00:00
129 lines
3.6 KiB
Go
129 lines
3.6 KiB
Go
/*
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Copyright 2018-2021 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 storage
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import (
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"fmt"
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"os"
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"path/filepath"
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"strings"
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"k8s.io/klog/v2"
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nfdv1alpha1 "sigs.k8s.io/node-feature-discovery/api/nfd/v1alpha1"
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"sigs.k8s.io/node-feature-discovery/pkg/utils"
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"sigs.k8s.io/node-feature-discovery/pkg/utils/hostpath"
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"sigs.k8s.io/node-feature-discovery/source"
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)
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// Name of this feature source
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const Name = "storage"
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const BlockFeature = "block"
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// storageSource implements the FeatureSource and LabelSource interfaces.
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type storageSource struct {
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features *nfdv1alpha1.Features
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}
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// Singleton source instance
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var (
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src storageSource
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_ source.FeatureSource = &src
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_ source.LabelSource = &src
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)
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// queueAttrs is the list of files under /sys/block/<dev>/queue that we're trying to read
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var queueAttrs = []string{"dax", "rotational", "nr_zones", "zoned"}
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// Name returns an identifier string for this feature source.
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func (s *storageSource) Name() string { return Name }
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// Priority method of the LabelSource interface
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func (s *storageSource) Priority() int { return 0 }
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// GetLabels method of the LabelSource interface
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func (s *storageSource) GetLabels() (source.FeatureLabels, error) {
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labels := source.FeatureLabels{}
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features := s.GetFeatures()
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for _, dev := range features.Instances[BlockFeature].Elements {
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if dev.Attributes["rotational"] == "0" {
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labels["nonrotationaldisk"] = true
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break
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}
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}
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return labels, nil
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}
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// Discover method of the FeatureSource interface
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func (s *storageSource) Discover() error {
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s.features = nfdv1alpha1.NewFeatures()
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devs, err := detectBlock()
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if err != nil {
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return fmt.Errorf("failed to detect block devices: %w", err)
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}
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s.features.Instances[BlockFeature] = nfdv1alpha1.InstanceFeatureSet{Elements: devs}
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klog.V(3).InfoS("discovered features", "featureSource", s.Name(), "features", utils.DelayedDumper(s.features))
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return nil
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}
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// GetFeatures method of the FeatureSource Interface.
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func (s *storageSource) GetFeatures() *nfdv1alpha1.Features {
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if s.features == nil {
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s.features = nfdv1alpha1.NewFeatures()
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}
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return s.features
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}
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func detectBlock() ([]nfdv1alpha1.InstanceFeature, error) {
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sysfsBasePath := hostpath.SysfsDir.Path("block")
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blockdevices, err := os.ReadDir(sysfsBasePath)
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if err != nil {
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return nil, fmt.Errorf("failed to list block devices: %w", err)
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}
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// Iterate over devices
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info := make([]nfdv1alpha1.InstanceFeature, 0, len(blockdevices))
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for _, device := range blockdevices {
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info = append(info, *readBlockDevQueueInfo(filepath.Join(sysfsBasePath, device.Name())))
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}
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return info, nil
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}
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func readBlockDevQueueInfo(path string) *nfdv1alpha1.InstanceFeature {
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attrs := map[string]string{"name": filepath.Base(path)}
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for _, attrName := range queueAttrs {
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data, err := os.ReadFile(filepath.Join(path, "queue", attrName))
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if err != nil {
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klog.V(3).ErrorS(err, "failed to read block device queue attribute", "attributeName", attrName)
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continue
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}
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attrs[attrName] = strings.TrimSpace(string(data))
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}
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return nfdv1alpha1.NewInstanceFeature(attrs)
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}
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func init() {
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source.Register(&src)
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}
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