142 lines
3.1 KiB
Go
142 lines
3.1 KiB
Go
package bcache
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import (
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"errors"
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"io/ioutil"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"github.com/influxdata/telegraf/plugins/inputs"
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)
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type Bcache struct {
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BcachePath string
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BcacheDevs []string
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}
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var sampleConfig = `
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# Bcache sets path
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# If not specified, then default is:
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# bcachePath = "/sys/fs/bcache"
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#
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# By default, telegraf gather stats for all bcache devices
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# Setting devices will restrict the stats to the specified
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# bcache devices.
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# bcacheDevs = ["bcache0", ...]
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`
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func (b *Bcache) SampleConfig() string {
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return sampleConfig
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}
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func (b *Bcache) Description() string {
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return "Read metrics of bcache from stats_total and dirty_data"
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}
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func getTags(bdev string) map[string]string {
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backingDevFile, _ := os.Readlink(bdev)
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backingDevPath := strings.Split(backingDevFile, "/")
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backingDev := backingDevPath[len(backingDevPath)-2]
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bcacheDevFile, _ := os.Readlink(bdev + "/dev")
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bcacheDevPath := strings.Split(bcacheDevFile, "/")
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bcacheDev := bcacheDevPath[len(bcacheDevPath)-1]
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return map[string]string{"backing_dev": backingDev, "bcache_dev": bcacheDev}
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}
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func prettyToBytes(v string) uint64 {
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var factors = map[string]uint64{
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"k": 1 << 10,
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"M": 1 << 20,
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"G": 1 << 30,
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"T": 1 << 40,
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"P": 1 << 50,
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"E": 1 << 60,
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}
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var factor uint64
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factor = 1
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prefix := v[len(v)-1 : len(v)]
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if factors[prefix] != 0 {
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v = v[:len(v)-1]
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factor = factors[prefix]
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}
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result, _ := strconv.ParseFloat(v, 32)
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result = result * float64(factor)
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return uint64(result)
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}
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func (b *Bcache) gatherBcache(bdev string, acc inputs.Accumulator) error {
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tags := getTags(bdev)
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metrics, err := filepath.Glob(bdev + "/stats_total/*")
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if len(metrics) < 0 {
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return errors.New("Can't read any stats file")
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}
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file, err := ioutil.ReadFile(bdev + "/dirty_data")
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if err != nil {
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return err
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}
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rawValue := strings.TrimSpace(string(file))
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value := prettyToBytes(rawValue)
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fields := make(map[string]interface{})
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fields["dirty_data"] = value
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for _, path := range metrics {
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key := filepath.Base(path)
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file, err := ioutil.ReadFile(path)
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rawValue := strings.TrimSpace(string(file))
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if err != nil {
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return err
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}
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if key == "bypassed" {
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value := prettyToBytes(rawValue)
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fields[key] = value
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} else {
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value, _ := strconv.ParseUint(rawValue, 10, 64)
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fields[key] = value
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}
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}
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acc.AddFields("bcache", fields, tags)
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return nil
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}
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func (b *Bcache) Gather(acc inputs.Accumulator) error {
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bcacheDevsChecked := make(map[string]bool)
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var restrictDevs bool
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if len(b.BcacheDevs) != 0 {
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restrictDevs = true
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for _, bcacheDev := range b.BcacheDevs {
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bcacheDevsChecked[bcacheDev] = true
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}
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}
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bcachePath := b.BcachePath
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if len(bcachePath) == 0 {
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bcachePath = "/sys/fs/bcache"
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}
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bdevs, _ := filepath.Glob(bcachePath + "/*/bdev*")
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if len(bdevs) < 1 {
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return errors.New("Can't find any bcache device")
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}
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for _, bdev := range bdevs {
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if restrictDevs {
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bcacheDev := getTags(bdev)["bcache_dev"]
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if !bcacheDevsChecked[bcacheDev] {
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continue
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}
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}
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b.gatherBcache(bdev, acc)
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}
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return nil
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}
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func init() {
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inputs.Add("bcache", func() inputs.Input {
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return &Bcache{}
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})
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}
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