telegraf/plugins/inputs/system/disk.go

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package system
import (
"fmt"
"regexp"
"strings"
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"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/plugins/inputs"
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)
type DiskStats struct {
ps PS
// Legacy support
Mountpoints []string
MountPoints []string
IgnoreFS []string `toml:"ignore_fs"`
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}
func (_ *DiskStats) Description() string {
return "Read metrics about disk usage by mount point"
}
var diskSampleConfig = `
## By default, telegraf gather stats for all mountpoints.
## Setting mountpoints will restrict the stats to the specified mountpoints.
# mount_points = ["/"]
## Ignore some mountpoints by filesystem type. For example (dev)tmpfs (usually
## present on /run, /var/run, /dev/shm or /dev).
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ignore_fs = ["tmpfs", "devtmpfs", "devfs"]
`
func (_ *DiskStats) SampleConfig() string {
return diskSampleConfig
}
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func (s *DiskStats) Gather(acc telegraf.Accumulator) error {
// Legacy support:
if len(s.Mountpoints) != 0 {
s.MountPoints = s.Mountpoints
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}
disks, partitions, err := s.ps.DiskUsage(s.MountPoints, s.IgnoreFS)
if err != nil {
return fmt.Errorf("error getting disk usage info: %s", err)
}
for i, du := range disks {
if du.Total == 0 {
// Skip dummy filesystem (procfs, cgroupfs, ...)
continue
}
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tags := map[string]string{
"path": du.Path,
"device": strings.Replace(partitions[i].Device, "/dev/", "", -1),
"fstype": du.Fstype,
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}
var used_percent float64
if du.Used+du.Free > 0 {
used_percent = float64(du.Used) /
(float64(du.Used) + float64(du.Free)) * 100
}
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fields := map[string]interface{}{
"total": du.Total,
"free": du.Free,
"used": du.Used,
"used_percent": used_percent,
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"inodes_total": du.InodesTotal,
"inodes_free": du.InodesFree,
"inodes_used": du.InodesUsed,
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}
acc.AddGauge("disk", fields, tags)
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}
return nil
}
type DiskIOStats struct {
ps PS
Devices []string
DeviceTags []string
NameTemplates []string
SkipSerialNumber bool
infoCache map[string]diskInfoCache
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}
func (_ *DiskIOStats) Description() string {
return "Read metrics about disk IO by device"
}
var diskIoSampleConfig = `
## By default, telegraf will gather stats for all devices including
## disk partitions.
## Setting devices will restrict the stats to the specified devices.
# devices = ["sda", "sdb"]
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## Uncomment the following line if you need disk serial numbers.
# skip_serial_number = false
#
## On systems which support it, device metadata can be added in the form of
## tags.
## Currently only Linux is supported via udev properties. You can view
## available properties for a device by running:
## 'udevadm info -q property -n /dev/sda'
# device_tags = ["ID_FS_TYPE", "ID_FS_USAGE"]
#
## Using the same metadata source as device_tags, you can also customize the
## name of the device via templates.
## The 'name_templates' parameter is a list of templates to try and apply to
## the device. The template may contain variables in the form of '$PROPERTY' or
## '${PROPERTY}'. The first template which does not contain any variables not
## present for the device is used as the device name tag.
## The typical use case is for LVM volumes, to get the VG/LV name instead of
## the near-meaningless DM-0 name.
# name_templates = ["$ID_FS_LABEL","$DM_VG_NAME/$DM_LV_NAME"]
`
func (_ *DiskIOStats) SampleConfig() string {
return diskIoSampleConfig
}
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func (s *DiskIOStats) Gather(acc telegraf.Accumulator) error {
diskio, err := s.ps.DiskIO(s.Devices)
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if err != nil {
return fmt.Errorf("error getting disk io info: %s", err)
}
for _, io := range diskio {
tags := map[string]string{}
tags["name"] = s.diskName(io.Name)
for t, v := range s.diskTags(io.Name) {
tags[t] = v
}
if !s.SkipSerialNumber {
if len(io.SerialNumber) != 0 {
tags["serial"] = io.SerialNumber
} else {
tags["serial"] = "unknown"
}
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}
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fields := map[string]interface{}{
"reads": io.ReadCount,
"writes": io.WriteCount,
"read_bytes": io.ReadBytes,
"write_bytes": io.WriteBytes,
"read_time": io.ReadTime,
"write_time": io.WriteTime,
"io_time": io.IoTime,
"iops_in_progress": io.IopsInProgress,
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}
acc.AddCounter("diskio", fields, tags)
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}
return nil
}
var varRegex = regexp.MustCompile(`\$(?:\w+|\{\w+\})`)
func (s *DiskIOStats) diskName(devName string) string {
di, err := s.diskInfo(devName)
if err != nil {
// discard error :-(
// We can't return error because it's non-fatal to the Gather().
// And we have no logger, so we can't log it.
return devName
}
if di == nil {
return devName
}
for _, nt := range s.NameTemplates {
miss := false
name := varRegex.ReplaceAllStringFunc(nt, func(sub string) string {
sub = sub[1:] // strip leading '$'
if sub[0] == '{' {
sub = sub[1 : len(sub)-1] // strip leading & trailing '{' '}'
}
if v, ok := di[sub]; ok {
return v
}
miss = true
return ""
})
if !miss {
return name
}
}
return devName
}
func (s *DiskIOStats) diskTags(devName string) map[string]string {
di, err := s.diskInfo(devName)
if err != nil {
// discard error :-(
// We can't return error because it's non-fatal to the Gather().
// And we have no logger, so we can't log it.
return nil
}
if di == nil {
return nil
}
tags := map[string]string{}
for _, dt := range s.DeviceTags {
if v, ok := di[dt]; ok {
tags[dt] = v
}
}
return tags
}
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func init() {
inputs.Add("disk", func() telegraf.Input {
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return &DiskStats{ps: &systemPS{}}
})
inputs.Add("diskio", func() telegraf.Input {
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return &DiskIOStats{ps: &systemPS{}, SkipSerialNumber: true}
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})
}