85 lines
1.9 KiB
Go
85 lines
1.9 KiB
Go
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package uptime
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import (
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"context"
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"fmt"
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"os"
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"strconv"
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"strings"
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"time"
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"git.faercol.me/monitoring/sys-exporter/registry"
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"github.com/prometheus/client_golang/prometheus"
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)
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const procUptimeLocation = "/proc/uptime"
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type UptimeCollector struct {
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ctx context.Context
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procFileLocation string
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uptimeFreq time.Duration
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uptime time.Duration
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uptimeProm prometheus.Gauge
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}
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func (c *UptimeCollector) Collect() interface{} {
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return c.uptime
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}
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func (c *UptimeCollector) update() error {
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fileContent, err := os.ReadFile(c.procFileLocation)
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if err != nil {
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return fmt.Errorf("failed to read uptime file: %w", err)
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}
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uptimeVals := strings.Split(string(fileContent), " ")
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if len(uptimeVals) != 2 {
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return fmt.Errorf("invalid format for /proc/uptime: %q", string(fileContent))
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}
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uptimeFloat, err := strconv.ParseFloat(uptimeVals[0], 64)
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if err != nil {
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return fmt.Errorf("invalid uptime format for float %s: %w", uptimeVals[0], err)
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}
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c.uptime = time.Duration(int(uptimeFloat)) * time.Second
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c.uptimeProm.Set(uptimeFloat)
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return nil
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}
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func (c *UptimeCollector) PromCollector() prometheus.Collector {
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return c.uptimeProm
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}
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func (c *UptimeCollector) Run(ctx context.Context) {
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if err := c.update(); err != nil {
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fmt.Printf("Failed to init collector: %s\n", err)
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}
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for {
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select {
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case <-ctx.Done():
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return
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case <-time.After(c.uptimeFreq):
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if err := c.update(); err != nil {
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fmt.Printf("Failed to update collector: %s\n", err)
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}
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}
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}
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}
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func New() *UptimeCollector {
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return &UptimeCollector{
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ctx: context.TODO(),
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procFileLocation: procUptimeLocation,
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uptimeFreq: 1 * time.Second,
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uptime: 0,
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uptimeProm: prometheus.NewGauge(prometheus.GaugeOpts{Namespace: "system", Name: "uptime_nanosec", Help: "System uptime in nanoseconds"}),
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}
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}
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func init() {
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registry.R.MustRegisterCollector("system.uptime", New())
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}
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