77 lines
2.2 KiB
Go
77 lines
2.2 KiB
Go
package main
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import (
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"flag"
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"log"
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"net/http"
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"sync"
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"github.com/martinlindhe/wmi_exporter/collectors"
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"github.com/prometheus/client_golang/prometheus"
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)
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// WmiExporter wraps all the WMI collectors and provides a single global
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// exporter to extracts metrics out of. It also ensures that the collection
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// is done in a thread-safe manner, the necessary requirement stated by
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// prometheus. It also implements a prometheus.Collector interface in order
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// to register it correctly.
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type WmiExporter struct {
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mu sync.Mutex
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collectors []prometheus.Collector
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}
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// Verify that the WmiExporter implements the prometheus.Collector interface.
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var _ prometheus.Collector = &WmiExporter{}
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// NewWmiExporter creates an instance to WmiExporter and returns a reference
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// to it. We can choose to enable a collector to extract stats out of by adding
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// it to the list of collectors.
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func NewWmiExporter() *WmiExporter {
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return &WmiExporter{
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collectors: []prometheus.Collector{
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collectors.NewOSCollector(),
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collectors.NewPerfCollector(),
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},
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}
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}
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// Describe sends all the descriptors of the collectors included to
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// the provided channel.
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func (c *WmiExporter) Describe(ch chan<- *prometheus.Desc) {
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for _, cc := range c.collectors {
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cc.Describe(ch)
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}
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}
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// Collect sends the collected metrics from each of the collectors to
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// prometheus. Collect could be called several times concurrently
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// and thus its run is protected by a single mutex.
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func (c *WmiExporter) Collect(ch chan<- prometheus.Metric) {
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c.mu.Lock()
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defer c.mu.Unlock()
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for _, cc := range c.collectors {
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cc.Collect(ch)
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}
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}
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func main() {
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var (
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addr = flag.String("telemetry.addr", ":9129", "host:port for WMI exporter")
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metricsPath = flag.String("telemetry.path", "/metrics", "URL path for surfacing collected metrics")
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)
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flag.Parse()
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prometheus.MustRegister(NewWmiExporter())
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http.Handle(*metricsPath, prometheus.Handler())
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http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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http.Redirect(w, r, *metricsPath, http.StatusMovedPermanently)
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})
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log.Printf("Starting WMI exporter on %q", *addr)
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if err := http.ListenAndServe(*addr, nil); err != nil {
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log.Fatalf("cannot start WMI exporter: %s", err)
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}
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}
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