mirror of
https://github.com/kubernetes-sigs/node-feature-discovery.git
synced 2024-12-15 17:50:49 +00:00
b907d07d7e
Flatten the data structure that stores features, dropping the "domain" level from the data model. That extra level of hierarchy brought little benefit but just caused some extra complexity, instead. The new structure nicely matches what we have in the NodeFeatureRule object (the matchFeatures field of uses the same flat structure with the "feature" field having a value <domain>.<feature>, e.g. "kernel.version"). This is pre-work for introducing a new "node feature" CRD that contains the raw feature data. It makes the life of both users and developers easier when both CRDs, plus our internal code, handle feature data in a similar flat structure.
129 lines
3.5 KiB
Go
129 lines
3.5 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/pkg/apis/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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utils.KlogDump(3, "discovered storage features:", " ", 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).Infof("failed to read block device queue attribute %s: %w", attrName, err)
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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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