100 lines
2.1 KiB
Go
100 lines
2.1 KiB
Go
// +build !nolastlogin
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package collector
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import (
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"bufio"
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"fmt"
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"io"
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"os/exec"
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"strings"
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"time"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/log"
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)
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const lastLoginSubsystem = "last_login"
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type lastLoginCollector struct {
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metric prometheus.Gauge
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}
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func init() {
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Factories["lastlogin"] = NewLastLoginCollector
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}
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// Takes a prometheus registry and returns a new Collector exposing
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// load, seconds since last login and a list of tags as specified by config.
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func NewLastLoginCollector() (Collector, error) {
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return &lastLoginCollector{
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metric: prometheus.NewGauge(prometheus.GaugeOpts{
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Namespace: Namespace,
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Subsystem: lastLoginSubsystem,
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Name: "time",
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Help: "The time of the last login.",
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}),
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}, nil
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}
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func (c *lastLoginCollector) Update(ch chan<- prometheus.Metric) (err error) {
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last, err := getLastLoginTime()
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if err != nil {
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return fmt.Errorf("Couldn't get last seen: %s", err)
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}
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log.Debugf("Set node_last_login_time: %f", last)
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c.metric.Set(last)
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c.metric.Collect(ch)
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return err
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}
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func getLastLoginTime() (float64, error) {
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who := exec.Command("who", "/var/log/wtmp", "-l", "-u", "-s")
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output, err := who.StdoutPipe()
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if err != nil {
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return 0, err
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}
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err = who.Start()
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if err != nil {
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return 0, err
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}
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reader := bufio.NewReader(output)
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var last time.Time
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for {
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line, isPrefix, err := reader.ReadLine()
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if err == io.EOF {
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break
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}
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if isPrefix {
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return 0, fmt.Errorf("line to long: %s(...)", line)
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}
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fields := strings.Fields(string(line))
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lastDate := fields[2]
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lastTime := fields[3]
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dateParts, err := splitToInts(lastDate, "-") // 2013-04-16
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if err != nil {
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return 0, fmt.Errorf("Couldn't parse date in line '%s': %s", fields, err)
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}
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timeParts, err := splitToInts(lastTime, ":") // 11:33
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if err != nil {
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return 0, fmt.Errorf("Couldn't parse time in line '%s': %s", fields, err)
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}
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last_t := time.Date(dateParts[0], time.Month(dateParts[1]), dateParts[2], timeParts[0], timeParts[1], 0, 0, time.UTC)
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last = last_t
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}
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err = who.Wait()
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if err != nil {
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return 0, err
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}
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return float64(last.Unix()), nil
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}
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