telegraf/plugins/inputs/system/linux_sysctl_fs.go

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package system
import (
"bytes"
"io/ioutil"
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"os"
"strconv"
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"path"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/plugins/inputs"
)
// https://www.kernel.org/doc/Documentation/sysctl/fs.txt
type SysctlFS struct {
path string
}
var sysctlFSDescription = `Provides Linux sysctl fs metrics`
var sysctlFSSampleConfig = ``
func (_ SysctlFS) Description() string {
return sysctlFSDescription
}
func (_ SysctlFS) SampleConfig() string {
return sysctlFSSampleConfig
}
func (sfs *SysctlFS) gatherList(file string, fields map[string]interface{}, fieldNames ...string) error {
bs, err := ioutil.ReadFile(sfs.path + "/" + file)
if err != nil {
return err
}
bsplit := bytes.Split(bytes.TrimRight(bs, "\n"), []byte{'\t'})
for i, name := range fieldNames {
if i >= len(bsplit) {
break
}
if name == "" {
continue
}
v, err := strconv.ParseUint(string(bsplit[i]), 10, 64)
if err != nil {
return err
}
fields[name] = v
}
return nil
}
func (sfs *SysctlFS) gatherOne(name string, fields map[string]interface{}) error {
bs, err := ioutil.ReadFile(sfs.path + "/" + name)
if err != nil {
return err
}
v, err := strconv.ParseUint(string(bytes.TrimRight(bs, "\n")), 10, 64)
if err != nil {
return err
}
fields[name] = v
return nil
}
func (sfs *SysctlFS) Gather(acc telegraf.Accumulator) error {
fields := map[string]interface{}{}
for _, n := range []string{"aio-nr", "aio-max-nr", "dquot-nr", "dquot-max", "super-nr", "super-max"} {
sfs.gatherOne(n, fields)
}
sfs.gatherList("inode-state", fields, "inode-nr", "inode-free-nr", "inode-preshrink-nr")
sfs.gatherList("dentry-state", fields, "dentry-nr", "dentry-unused-nr", "dentry-age-limit", "dentry-want-pages")
sfs.gatherList("file-nr", fields, "file-nr", "", "file-max")
acc.AddFields("linux_sysctl_fs", fields, nil)
return nil
}
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func GetHostProc() string {
procPath := "/proc"
if os.Getenv("HOST_PROC") != "" {
procPath = os.Getenv("HOST_PROC")
}
return procPath
}
func init() {
inputs.Add("linux_sysctl_fs", func() telegraf.Input {
return &SysctlFS{
path: path.Join(GetHostProc(), "/sys/fs"),
}
})
}