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100 lines
2.8 KiB
100 lines
2.8 KiB
/*
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Copyright 2014 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 volume
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import (
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"k8s.io/apimachinery/pkg/api/resource"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/kubernetes/pkg/volume/util/fs"
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)
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var _ MetricsProvider = &metricsDu{}
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// metricsDu represents a MetricsProvider that calculates the used and
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// available Volume space by calling fs.DiskUsage() and gathering
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// filesystem info for the Volume path.
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type metricsDu struct {
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// the directory path the volume is mounted to.
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path string
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}
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// NewMetricsDu creates a new metricsDu with the Volume path.
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func NewMetricsDu(path string) MetricsProvider {
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return &metricsDu{path}
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}
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// GetMetrics calculates the volume usage and device free space by executing "du"
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// and gathering filesystem info for the Volume path.
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// See MetricsProvider.GetMetrics
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func (md *metricsDu) GetMetrics() (*Metrics, error) {
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metrics := &Metrics{Time: metav1.Now()}
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if md.path == "" {
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return metrics, NewNoPathDefinedError()
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}
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err := md.runDiskUsage(metrics)
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if err != nil {
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return metrics, err
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}
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err = md.runFind(metrics)
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if err != nil {
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return metrics, err
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}
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err = md.getFsInfo(metrics)
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if err != nil {
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return metrics, err
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}
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return metrics, nil
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}
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// runDiskUsage gets disk usage of md.path and writes the results to metrics.Used
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func (md *metricsDu) runDiskUsage(metrics *Metrics) error {
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used, err := fs.DiskUsage(md.path)
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if err != nil {
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return err
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}
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metrics.Used = used
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return nil
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}
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// runFind executes the "find" command and writes the results to metrics.InodesUsed
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func (md *metricsDu) runFind(metrics *Metrics) error {
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inodesUsed, err := fs.Find(md.path)
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if err != nil {
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return err
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}
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metrics.InodesUsed = resource.NewQuantity(inodesUsed, resource.BinarySI)
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return nil
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}
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// getFsInfo writes metrics.Capacity and metrics.Available from the filesystem
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// info
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func (md *metricsDu) getFsInfo(metrics *Metrics) error {
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available, capacity, _, inodes, inodesFree, _, err := fs.FsInfo(md.path)
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if err != nil {
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return NewFsInfoFailedError(err)
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}
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metrics.Available = resource.NewQuantity(available, resource.BinarySI)
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metrics.Capacity = resource.NewQuantity(capacity, resource.BinarySI)
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metrics.Inodes = resource.NewQuantity(inodes, resource.BinarySI)
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metrics.InodesFree = resource.NewQuantity(inodesFree, resource.BinarySI)
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return nil
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}
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