telegraf/plugins/inputs/zfs/zfs_freebsd.go

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// +build freebsd
package zfs
import (
"bytes"
"fmt"
"os/exec"
"strconv"
"strings"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/plugins/inputs"
)
func (z *Zfs) gatherPoolStats(acc telegraf.Accumulator) (string, error) {
lines, err := z.zpool()
if err != nil {
return "", err
}
pools := []string{}
for _, line := range lines {
col := strings.Split(line, "\t")
pools = append(pools, col[0])
}
if z.PoolMetrics {
for _, line := range lines {
col := strings.Split(line, "\t")
tags := map[string]string{"pool": col[0], "health": col[8]}
fields := map[string]interface{}{}
if tags["health"] == "UNAVAIL" {
fields["size"] = int64(0)
} else {
size, err := strconv.ParseInt(col[1], 10, 64)
if err != nil {
return "", fmt.Errorf("Error parsing size: %s", err)
}
fields["size"] = size
alloc, err := strconv.ParseInt(col[2], 10, 64)
if err != nil {
return "", fmt.Errorf("Error parsing allocation: %s", err)
}
fields["allocated"] = alloc
free, err := strconv.ParseInt(col[3], 10, 64)
if err != nil {
return "", fmt.Errorf("Error parsing free: %s", err)
}
fields["free"] = free
frag, err := strconv.ParseInt(strings.TrimSuffix(col[5], "%"), 10, 0)
if err != nil { // This might be - for RO devs
frag = 0
}
fields["fragmentation"] = frag
capval, err := strconv.ParseInt(col[6], 10, 0)
if err != nil {
return "", fmt.Errorf("Error parsing capacity: %s", err)
}
fields["capacity"] = capval
dedup, err := strconv.ParseFloat(strings.TrimSuffix(col[7], "x"), 32)
if err != nil {
return "", fmt.Errorf("Error parsing dedupratio: %s", err)
}
fields["dedupratio"] = dedup
}
acc.AddFields("zfs_pool", fields, tags)
}
}
return strings.Join(pools, "::"), nil
}
func (z *Zfs) Gather(acc telegraf.Accumulator) error {
kstatMetrics := z.KstatMetrics
if len(kstatMetrics) == 0 {
kstatMetrics = []string{"arcstats", "zfetchstats", "vdev_cache_stats"}
}
tags := map[string]string{}
poolNames, err := z.gatherPoolStats(acc)
if err != nil {
return err
}
tags["pools"] = poolNames
fields := make(map[string]interface{})
for _, metric := range kstatMetrics {
stdout, err := z.sysctl(metric)
if err != nil {
return err
}
for _, line := range stdout {
rawData := strings.Split(line, ": ")
key := metric + "_" + strings.Split(rawData[0], ".")[4]
value, _ := strconv.ParseInt(rawData[1], 10, 64)
fields[key] = value
}
}
acc.AddFields("zfs", fields, tags)
return nil
}
func run(command string, args ...string) ([]string, error) {
cmd := exec.Command(command, args...)
var outbuf, errbuf bytes.Buffer
cmd.Stdout = &outbuf
cmd.Stderr = &errbuf
err := cmd.Run()
stdout := strings.TrimSpace(outbuf.String())
stderr := strings.TrimSpace(errbuf.String())
if _, ok := err.(*exec.ExitError); ok {
return nil, fmt.Errorf("%s error: %s", command, stderr)
}
return strings.Split(stdout, "\n"), nil
}
func zpool() ([]string, error) {
return run("zpool", []string{"list", "-Hp"}...)
}
func sysctl(metric string) ([]string, error) {
return run("sysctl", []string{"-q", fmt.Sprintf("kstat.zfs.misc.%s", metric)}...)
}
func init() {
inputs.Add("zfs", func() telegraf.Input {
return &Zfs{
sysctl: sysctl,
zpool: zpool,
}
})
}