156 lines
3.1 KiB
Go
156 lines
3.1 KiB
Go
package zfs
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import (
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"fmt"
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"path/filepath"
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"strconv"
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"strings"
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"github.com/influxdata/telegraf/internal"
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"github.com/influxdata/telegraf/plugins/inputs"
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)
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type Zfs struct {
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KstatPath string
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KstatMetrics []string
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PoolMetrics bool
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}
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type poolInfo struct {
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name string
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ioFilename string
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}
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var sampleConfig = `
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# ZFS kstat path
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# If not specified, then default is:
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# kstatPath = "/proc/spl/kstat/zfs"
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#
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# By default, telegraf gather all zfs stats
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# If not specified, then default is:
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# kstatMetrics = ["arcstats", "zfetchstats", "vdev_cache_stats"]
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#
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# By default, don't gather zpool stats
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# poolMetrics = false
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`
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func (z *Zfs) SampleConfig() string {
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return sampleConfig
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}
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func (z *Zfs) Description() string {
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return "Read metrics of ZFS from arcstats, zfetchstats and vdev_cache_stats"
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}
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func getPools(kstatPath string) []poolInfo {
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pools := make([]poolInfo, 0)
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poolsDirs, _ := filepath.Glob(kstatPath + "/*/io")
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for _, poolDir := range poolsDirs {
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poolDirSplit := strings.Split(poolDir, "/")
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pool := poolDirSplit[len(poolDirSplit)-2]
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pools = append(pools, poolInfo{name: pool, ioFilename: poolDir})
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}
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return pools
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}
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func getTags(pools []poolInfo) map[string]string {
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var poolNames string
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for _, pool := range pools {
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if len(poolNames) != 0 {
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poolNames += "::"
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}
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poolNames += pool.name
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}
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return map[string]string{"pools": poolNames}
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}
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func gatherPoolStats(pool poolInfo, acc inputs.Accumulator) error {
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lines, err := internal.ReadLines(pool.ioFilename)
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if err != nil {
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return err
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}
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if len(lines) != 3 {
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return err
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}
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keys := strings.Fields(lines[1])
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values := strings.Fields(lines[2])
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keyCount := len(keys)
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if keyCount != len(values) {
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return fmt.Errorf("Key and value count don't match Keys:%v Values:%v", keys, values)
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}
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tag := map[string]string{"pool": pool.name}
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fields := make(map[string]interface{})
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for i := 0; i < keyCount; i++ {
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value, err := strconv.ParseInt(values[i], 10, 64)
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if err != nil {
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return err
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}
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fields[keys[i]] = value
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}
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acc.AddFields("zfs_pool", fields, tag)
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return nil
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}
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func (z *Zfs) Gather(acc inputs.Accumulator) error {
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kstatMetrics := z.KstatMetrics
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if len(kstatMetrics) == 0 {
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kstatMetrics = []string{"arcstats", "zfetchstats", "vdev_cache_stats"}
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}
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kstatPath := z.KstatPath
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if len(kstatPath) == 0 {
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kstatPath = "/proc/spl/kstat/zfs"
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}
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pools := getPools(kstatPath)
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tags := getTags(pools)
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if z.PoolMetrics {
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for _, pool := range pools {
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err := gatherPoolStats(pool, acc)
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if err != nil {
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return err
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}
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}
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}
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fields := make(map[string]interface{})
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for _, metric := range kstatMetrics {
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lines, err := internal.ReadLines(kstatPath + "/" + metric)
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if err != nil {
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return err
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}
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for i, line := range lines {
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if i == 0 || i == 1 {
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continue
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}
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if len(line) < 1 {
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continue
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}
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rawData := strings.Split(line, " ")
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key := metric + "_" + rawData[0]
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rawValue := rawData[len(rawData)-1]
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value, _ := strconv.ParseInt(rawValue, 10, 64)
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fields[key] = value
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}
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}
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acc.AddFields("zfs", fields, tags)
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return nil
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}
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func init() {
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inputs.Add("zfs", func() inputs.Input {
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return &Zfs{}
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})
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}
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