/
pcp_exporter.go
136 lines (118 loc) · 3.55 KB
/
pcp_exporter.go
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package main
import (
"flag"
"fmt"
"net/http"
"os"
"sync"
"time"
"github.com/HewlettPackard/pcp_exporter/sources"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/prometheus/common/log"
"github.com/prometheus/common/version"
)
var (
scrapeDurations = prometheus.NewSummaryVec(
prometheus.SummaryOpts{
Namespace: sources.Namespace,
Subsystem: "exporter",
Name: "scrape_duration_seconds",
Help: "pcp_exporter: Duration of a scrape job.",
},
[]string{"source", "result"},
)
)
//PcpSource is a list of all sources that the user would like to collect.
type PcpSource struct {
sourceList map[string]sources.PcpSource
}
//Describe implements the prometheus.Describe interface
func (p PcpSource) Describe(ch chan<- *prometheus.Desc) {
scrapeDurations.Describe(ch)
}
//Collect implements the prometheus.Collect interface
func (p PcpSource) Collect(ch chan<- prometheus.Metric) {
wg := sync.WaitGroup{}
wg.Add(len(p.sourceList))
for name, c := range p.sourceList {
go func(name string, c sources.PcpSource) {
collectFromSource(name, c, ch)
wg.Done()
}(name, c)
}
wg.Wait()
scrapeDurations.Collect(ch)
}
func collectFromSource(name string, s sources.PcpSource, ch chan<- prometheus.Metric) {
result := "success"
begin := time.Now()
err := s.Update(ch)
duration := time.Since(begin)
if err != nil {
log.Errorf("ERROR: %q source failed after %f seconds: %s", name, duration.Seconds(), err)
result = "error"
} else {
log.Debugf("OK: %q source succeeded after %f seconds: %s", name, duration.Seconds(), err)
}
scrapeDurations.WithLabelValues(name, result).Observe(duration.Seconds())
}
func loadSources(list []string) (map[string]sources.PcpSource, error) {
sourceList := map[string]sources.PcpSource{}
for _, name := range list {
fn, ok := sources.Factories[name]
if !ok {
return nil, fmt.Errorf("source %q not available", name)
}
c, err := fn()
if err != nil {
return nil, err
}
sourceList[name] = c
}
return sourceList, nil
}
func init() {
prometheus.MustRegister(version.NewCollector("pcp_exporter"))
}
func main() {
var (
showVersion = flag.Bool("version", false, "Print version information.")
listenAddress = flag.String("web.listen-address", ":9259", "Address to use to expose pcp metrics.")
metricsPath = flag.String("web.telemetry-path", "/metrics", "Path to use to expose pcp metrics.")
)
flag.Parse()
if *showVersion {
fmt.Fprintln(os.Stdout, version.Print("pcp_exporter"))
os.Exit(0)
}
log.Infoln("Starting pcp_exporter", version.Info())
log.Infoln("Build context", version.BuildContext())
//expand to include more sources eventually (CLI, other?)
enabledSources := []string{"pmwebapi"}
sourceList, err := loadSources(enabledSources)
if err != nil {
log.Fatalf("Couldn't load sources: %q", err)
}
log.Infof("Enabled sources:")
for s := range sourceList {
log.Infof(" - %s", s)
}
prometheus.MustRegister(PcpSource{sourceList: sourceList})
handler := promhttp.HandlerFor(prometheus.DefaultGatherer, promhttp.HandlerOpts{ErrorLog: log.NewErrorLogger()})
http.Handle(*metricsPath, prometheus.InstrumentHandler("prometheus", handler))
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(`<html>
<head><title>PCP Exporter</title></head>
<body>
<h1>PCP Exporter</h1>
<p><a href="` + *metricsPath + `">Metrics</a></p>
</body>
</html>`))
})
log.Infoln("Listening on", *listenAddress)
err = http.ListenAndServe(*listenAddress, nil)
if err != nil {
log.Fatal(err)
}
}