mirror of
https://github.com/ceph/ceph-csi.git
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88 lines
2.3 KiB
Go
88 lines
2.3 KiB
Go
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/*
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Copyright 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 volume
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import (
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"fmt"
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"io"
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"os"
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"runtime"
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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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)
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var _ MetricsProvider = &metricsBlock{}
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// metricsBlock represents a MetricsProvider that detects the size of the
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// BlockMode Volume.
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type metricsBlock struct {
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// the device node where the volume is attached to.
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device string
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}
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// NewMetricsStatfs creates a new metricsBlock with the device node of the
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// Volume.
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func NewMetricsBlock(device string) MetricsProvider {
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return &metricsBlock{device}
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}
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// See MetricsProvider.GetMetrics
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// GetMetrics detects the size of the BlockMode volume for the device node
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// where the Volume is attached.
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//
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// Note that only the capacity of the device can be detected with standard
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// tools. Storage systems may have more information that they can provide by
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// going through specialized APIs.
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func (mb *metricsBlock) GetMetrics() (*Metrics, error) {
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// TODO: Windows does not yet support VolumeMode=Block
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if runtime.GOOS == "windows" {
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return nil, NewNotImplementedError("Windows does not support Block volumes")
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}
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metrics := &Metrics{Time: metav1.Now()}
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if mb.device == "" {
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return metrics, NewNoPathDefinedError()
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}
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err := mb.getBlockInfo(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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// getBlockInfo fetches metrics.Capacity by opening the device and seeking to
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// the end.
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func (mb *metricsBlock) getBlockInfo(metrics *Metrics) error {
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dev, err := os.Open(mb.device)
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if err != nil {
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return fmt.Errorf("unable to open device %q: %w", mb.device, err)
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}
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defer dev.Close()
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end, err := dev.Seek(0, io.SeekEnd)
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if err != nil {
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return fmt.Errorf("failed to detect size of %q: %w", mb.device, err)
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}
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metrics.Capacity = resource.NewQuantity(end, resource.BinarySI)
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return nil
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}
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