telegraf/plugins/inputs/system/disk_linux_test.go

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// +build linux
package system
import (
"io/ioutil"
"os"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
var nullDiskInfo = []byte(`
E:MY_PARAM_1=myval1
E:MY_PARAM_2=myval2
`)
// setupNullDisk sets up fake udev info as if /dev/null were a disk.
func setupNullDisk(t *testing.T) func() error {
td, err := ioutil.TempDir("", ".telegraf.TestDiskInfo")
require.NoError(t, err)
origUdevPath := udevPath
cleanFunc := func() error {
udevPath = origUdevPath
return os.RemoveAll(td)
}
udevPath = td
err = ioutil.WriteFile(td+"/b1:3", nullDiskInfo, 0644) // 1:3 is the 'null' device
if err != nil {
cleanFunc()
t.Fatal(err)
}
return cleanFunc
}
func TestDiskInfo(t *testing.T) {
clean := setupNullDisk(t)
defer clean()
s := &DiskIOStats{}
di, err := s.diskInfo("null")
require.NoError(t, err)
assert.Equal(t, "myval1", di["MY_PARAM_1"])
assert.Equal(t, "myval2", di["MY_PARAM_2"])
// test that data is cached
err = clean()
require.NoError(t, err)
di, err = s.diskInfo("null")
require.NoError(t, err)
assert.Equal(t, "myval1", di["MY_PARAM_1"])
assert.Equal(t, "myval2", di["MY_PARAM_2"])
// unfortunately we can't adjust mtime on /dev/null to test cache invalidation
}
// DiskIOStats.diskName isn't a linux specific function, but dependent
// functions are a no-op on non-Linux.
func TestDiskIOStats_diskName(t *testing.T) {
defer setupNullDisk(t)()
tests := []struct {
templates []string
expected string
}{
{[]string{"$MY_PARAM_1"}, "myval1"},
{[]string{"${MY_PARAM_1}"}, "myval1"},
{[]string{"x$MY_PARAM_1"}, "xmyval1"},
{[]string{"x${MY_PARAM_1}x"}, "xmyval1x"},
{[]string{"$MISSING", "$MY_PARAM_1"}, "myval1"},
{[]string{"$MY_PARAM_1", "$MY_PARAM_2"}, "myval1"},
{[]string{"$MISSING"}, "null"},
{[]string{"$MY_PARAM_1/$MY_PARAM_2"}, "myval1/myval2"},
{[]string{"$MY_PARAM_2/$MISSING"}, "null"},
}
for _, tc := range tests {
s := DiskIOStats{
NameTemplates: tc.templates,
}
assert.Equal(t, tc.expected, s.diskName("null"), "Templates: %#v", tc.templates)
}
}
// DiskIOStats.diskTags isn't a linux specific function, but dependent
// functions are a no-op on non-Linux.
func TestDiskIOStats_diskTags(t *testing.T) {
defer setupNullDisk(t)()
s := &DiskIOStats{
DeviceTags: []string{"MY_PARAM_2"},
}
dt := s.diskTags("null")
assert.Equal(t, map[string]string{"MY_PARAM_2": "myval2"}, dt)
}