mirror of
https://github.com/prometheus/node_exporter.git
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139 lines
3.4 KiB
Go
139 lines
3.4 KiB
Go
// +build !nofilesystem
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package collector
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import (
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"bufio"
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"flag"
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"fmt"
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"os"
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"regexp"
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"strings"
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"syscall"
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"github.com/golang/glog"
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"github.com/prometheus/client_golang/prometheus"
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)
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const (
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procMounts = "/proc/mounts"
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filesystemSubsystem = "filesystem"
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)
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var (
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ignoredMountPoints = flag.String("filesystemIgnoredMountPoints", "^/(sys|proc|dev)($|/)", "Regexp of mount points to ignore for filesystem collector.")
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)
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type filesystemCollector struct {
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config Config
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ignoredMountPointsPattern *regexp.Regexp
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size, free, avail, files, filesFree *prometheus.GaugeVec
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}
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func init() {
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Factories["filesystem"] = NewFilesystemCollector
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}
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// Takes a config struct and prometheus registry and returns a new Collector exposing
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// network device filesystems.
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func NewFilesystemCollector(config Config) (Collector, error) {
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var filesystemLabelNames = []string{"filesystem"}
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return &filesystemCollector{
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config: config,
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ignoredMountPointsPattern: regexp.MustCompile(*ignoredMountPoints),
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size: prometheus.NewGaugeVec(
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prometheus.GaugeOpts{
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Namespace: Namespace,
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Subsystem: filesystemSubsystem,
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Name: "size",
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Help: "Filesystem size in bytes.",
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},
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filesystemLabelNames,
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),
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free: prometheus.NewGaugeVec(
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prometheus.GaugeOpts{
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Namespace: Namespace,
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Subsystem: filesystemSubsystem,
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Name: "free",
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Help: "Filesystem free space in bytes.",
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},
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filesystemLabelNames,
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),
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avail: prometheus.NewGaugeVec(
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prometheus.GaugeOpts{
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Namespace: Namespace,
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Subsystem: filesystemSubsystem,
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Name: "avail",
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Help: "Filesystem space available to non-root users in bytes.",
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},
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filesystemLabelNames,
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),
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files: prometheus.NewGaugeVec(
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prometheus.GaugeOpts{
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Namespace: Namespace,
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Subsystem: filesystemSubsystem,
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Name: "files",
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Help: "Filesystem total file nodes.",
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},
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filesystemLabelNames,
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),
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filesFree: prometheus.NewGaugeVec(
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prometheus.GaugeOpts{
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Namespace: Namespace,
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Subsystem: filesystemSubsystem,
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Name: "files_free",
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Help: "Filesystem total free file nodes.",
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},
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filesystemLabelNames,
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),
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}, nil
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}
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// Expose filesystem fullness.
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func (c *filesystemCollector) Update(ch chan<- prometheus.Metric) (err error) {
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mps, err := mountPoints()
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if err != nil {
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return err
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}
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for _, mp := range mps {
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if c.ignoredMountPointsPattern.MatchString(mp) {
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glog.V(1).Infof("Ignoring mount point: %s", mp)
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continue
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}
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buf := new(syscall.Statfs_t)
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err := syscall.Statfs(mp, buf)
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if err != nil {
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return fmt.Errorf("Statfs on %s returned %s", mp, err)
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}
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c.size.WithLabelValues(mp).Set(float64(buf.Blocks) * float64(buf.Bsize))
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c.free.WithLabelValues(mp).Set(float64(buf.Bfree) * float64(buf.Bsize))
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c.avail.WithLabelValues(mp).Set(float64(buf.Bavail) * float64(buf.Bsize))
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c.files.WithLabelValues(mp).Set(float64(buf.Files))
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c.filesFree.WithLabelValues(mp).Set(float64(buf.Ffree))
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}
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c.size.Collect(ch)
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c.free.Collect(ch)
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c.avail.Collect(ch)
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c.files.Collect(ch)
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c.filesFree.Collect(ch)
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return err
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}
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func mountPoints() ([]string, error) {
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file, err := os.Open(procMounts)
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if err != nil {
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return nil, err
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}
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defer file.Close()
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mountPoints := []string{}
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scanner := bufio.NewScanner(file)
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for scanner.Scan() {
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parts := strings.Fields(scanner.Text())
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mountPoints = append(mountPoints, parts[1])
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}
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return mountPoints, nil
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}
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