categraf/inputs/disk/disk.go

package disk

import (
	"log"
	"strings"

	"flashcat.cloud/categraf/config"
	"flashcat.cloud/categraf/inputs"
	"flashcat.cloud/categraf/inputs/system"
	"flashcat.cloud/categraf/pkg/choice"
	"flashcat.cloud/categraf/types"
)

type DiskStats struct {
	ps system.PS

	config.PluginConfig
	MountPoints       []string `toml:"mount_points"`
	IgnoreFS          []string `toml:"ignore_fs"`
	IgnoreMountPoints []string `toml:"ignore_mount_points"`
}

func init() {
	ps := system.NewSystemPS()
	inputs.Add("disk", func() inputs.Input {
		return &DiskStats{
			ps: ps,
		}
	})
}

// just placeholder
func (s *DiskStats) GetInstances() []inputs.Instance {
	return nil
}

func (s *DiskStats) Init() error {
	return nil
}

func (s *DiskStats) Drop() {
}

func (s *DiskStats) Gather(slist *types.SampleList) {
	disks, partitions, err := s.ps.DiskUsage(s.MountPoints, s.IgnoreFS)
	if err != nil {
		log.Println("E! failed to get disk usage:", err)
		return
	}

	for i, du := range disks {
		if du.Total == 0 {
			// Skip dummy filesystem (procfs, cgroupfs, ...)
			continue
		}

		if len(s.IgnoreMountPoints) > 0 {
			if choice.Contains(du.Path, s.IgnoreMountPoints) {
				continue
			}
		}

		mountOpts := MountOptions(partitions[i].Opts)
		tags := map[string]string{
			"path":   du.Path,
			"device": strings.Replace(partitions[i].Device, "/dev/", "", -1),
			"fstype": du.Fstype,
			"mode":   mountOpts.Mode(),
		}
		var usedPercent float64
		if du.Used+du.Free > 0 {
			usedPercent = float64(du.Used) /
				(float64(du.Used) + float64(du.Free)) * 100
		}

		fields := map[string]interface{}{
			"total":        du.Total,
			"free":         du.Free,
			"used":         du.Used,
			"used_percent": usedPercent,
			"inodes_total": du.InodesTotal,
			"inodes_free":  du.InodesFree,
			"inodes_used":  du.InodesUsed,
		}

		slist.PushSamples("disk", fields, tags)
	}
}

type MountOptions []string

func (opts MountOptions) Mode() string {
	if opts.exists("rw") {
		return "rw"
	} else if opts.exists("ro") {
		return "ro"
	} else {
		return "unknown"
	}
}

func (opts MountOptions) exists(opt string) bool {
	for _, o := range opts {
		if o == opt {
			return true
		}
	}
	return false
}