2b9c81b87d
Similar to how NewMetricsStatFS() works, the new NewMetricsBlock() provides the GetMetrics() interface for Block volumes. Additional metrics for Block volumes are difficult to gather. There is no guarantee that there is a filesystem on the volume, which makes most of the volume metrics useless. Advanced storage might be able to detect the actual consumption (when thin-provisioned) vs the capacity. However, this is out of the scope for a standard helper function and requires intimate knowledge of the used storage system.
99 lines
2.8 KiB
Go
99 lines
2.8 KiB
Go
/*
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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_test
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import (
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"io/fs"
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"os"
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"runtime"
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"testing"
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. "k8s.io/kubernetes/pkg/volume"
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volumetest "k8s.io/kubernetes/pkg/volume/testing"
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)
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func TestGetMetricsBlockInvalid(t *testing.T) {
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metrics := NewMetricsBlock("")
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actual, err := metrics.GetMetrics()
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expected := &Metrics{}
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if !volumetest.MetricsEqualIgnoreTimestamp(actual, expected) {
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t.Errorf("Expected empty Metrics from uninitialized MetricsBlock, actual %v", *actual)
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}
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if err == nil {
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t.Errorf("Expected error when calling GetMetrics on uninitialized MetricsBlock, actual nil")
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}
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metrics = NewMetricsBlock("/nonexistent/device/node")
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actual, err = metrics.GetMetrics()
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if !volumetest.MetricsEqualIgnoreTimestamp(actual, expected) {
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t.Errorf("Expected empty Metrics from incorrectly initialized MetricsBlock, actual %v", *actual)
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}
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if err == nil {
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t.Errorf("Expected error when calling GetMetrics on incorrectly initialized MetricsBlock, actual nil")
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}
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}
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func TestGetMetricsBlock(t *testing.T) {
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// FIXME: this test is Linux specific
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if runtime.GOOS == "windows" {
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t.Skip("Block device detection is Linux specific, no Windows support")
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}
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// find a block device
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// get all available block devices
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// - ls /sys/block
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devices, err := os.ReadDir("/dev")
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if err != nil {
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t.Skipf("Could not read devices from /dev: %v", err)
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} else if len(devices) == 0 {
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t.Skip("No devices found")
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}
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// for each device, check if it is available in /dev
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devNode := ""
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var stat fs.FileInfo
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for _, device := range devices {
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// if the device exists, use it, return
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devNode = "/dev/" + device.Name()
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stat, err = os.Stat(devNode)
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if err == nil {
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if stat.Mode().Type() == fs.ModeDevice {
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break
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}
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}
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// set to an empty string, so we can do validation of the last
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// device too
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devNode = ""
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}
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// if no devices are found, or none exists in /dev, skip this part
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if devNode == "" {
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t.Skip("Could not find a block device under /dev")
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}
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// when we get here, devNode points to an existing block device
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metrics := NewMetricsBlock(devNode)
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actual, err := metrics.GetMetrics()
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if err != nil {
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t.Errorf("Unexpected error when calling GetMetrics: %v", err)
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}
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if a := actual.Capacity.Value(); a <= 0 {
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t.Errorf("Expected Capacity %d to be greater than 0.", a)
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}
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}
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