87 lines
2.2 KiB
Go
87 lines
2.2 KiB
Go
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package loadavg
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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 loadAvgFileLocation = "/proc/loadavg"
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type LoadAvgCollector struct {
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loadAvgFileLocation string
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promExporter *prometheus.SummaryVec
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updateFreq time.Duration
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}
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func (c *LoadAvgCollector) Collect() interface{} {
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return nil
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}
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func (c *LoadAvgCollector) update() error {
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fileContent, err := os.ReadFile(c.loadAvgFileLocation)
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if err != nil {
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return fmt.Errorf("failed to read loadavg file: %w", err)
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}
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vals := strings.Split(string(fileContent), " ")
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if len(vals) != 5 {
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return fmt.Errorf("invalid format %q for loadavg file", string(fileContent))
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}
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var load1Min, load5Min, load15Min float64
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if load1Min, err = strconv.ParseFloat(vals[0], 64); err != nil {
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return fmt.Errorf("invalid value %q for load 1min: %w", vals[0], err)
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}
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if load5Min, err = strconv.ParseFloat(vals[1], 64); err != nil {
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return fmt.Errorf("invalid value %q for load 5mins: %w", vals[1], err)
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}
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if load15Min, err = strconv.ParseFloat(vals[2], 64); err != nil {
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return fmt.Errorf("invalid value %q for load 15min: %w", vals[2], err)
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}
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c.promExporter.WithLabelValues("1min").Observe(load1Min)
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c.promExporter.WithLabelValues("5mins").Observe(load5Min)
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c.promExporter.WithLabelValues("15mins").Observe(load15Min)
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return nil
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}
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func (c *LoadAvgCollector) Run(ctx context.Context) {
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if err := c.update(); err != nil {
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fmt.Printf("Failed to init loadavg 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.updateFreq):
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if err := c.update(); err != nil {
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fmt.Printf("Failed to update loadavg 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 (c *LoadAvgCollector) PromCollector() prometheus.Collector {
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return c.promExporter
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}
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func New() *LoadAvgCollector {
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return &LoadAvgCollector{
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updateFreq: 1 * time.Second,
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loadAvgFileLocation: loadAvgFileLocation,
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promExporter: prometheus.NewSummaryVec(prometheus.SummaryOpts{Namespace: "system", Name: "loadavg", Help: "Load average of the system"}, []string{"period"}),
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}
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}
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func init() {
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registry.R.MustRegisterCollector("system.loadavg", New())
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}
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