68 lines
1.4 KiB
Go
68 lines
1.4 KiB
Go
// +build !noloadavg
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package collector
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import (
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"fmt"
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"io/ioutil"
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"strconv"
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"strings"
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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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procLoad = "/proc/loadavg"
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)
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type loadavgCollector struct {
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config Config
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metric prometheus.Gauge
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}
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func init() {
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Factories["loadavg"] = NewLoadavgCollector
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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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// load, seconds since last login and a list of tags as specified by config.
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func NewLoadavgCollector(config Config) (Collector, error) {
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return &loadavgCollector{
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config: config,
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metric: prometheus.NewGauge(prometheus.GaugeOpts{
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Namespace: Namespace,
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Name: "load1",
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Help: "1m load average.",
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}),
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}, nil
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}
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func (c *loadavgCollector) Update(ch chan<- prometheus.Metric) (err error) {
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load, err := getLoad1()
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if err != nil {
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return fmt.Errorf("Couldn't get load: %s", err)
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}
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glog.V(1).Infof("Set node_load: %f", load)
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c.metric.Set(load)
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c.metric.Collect(ch)
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return err
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}
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func getLoad1() (float64, error) {
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data, err := ioutil.ReadFile(procLoad)
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if err != nil {
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return 0, err
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}
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return parseLoad(string(data))
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}
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func parseLoad(data string) (float64, error) {
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parts := strings.Fields(data)
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load, err := strconv.ParseFloat(parts[0], 64)
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if err != nil {
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return 0, fmt.Errorf("Could not parse load '%s': %s", parts[0], err)
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}
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return load, nil
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}
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