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main.go
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package main
import (
"flag"
"fmt"
"net/http"
"os"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/prometheus/common/log"
)
const version string = "0.1"
var (
showVersion = flag.Bool("version", false, "Print version information.")
listenAddress = flag.String("listen-address", ":9423", "Address on which to expose metrics.")
metricsPath = flag.String("path", "/metrics", "Path under which to expose metrics.")
command = flag.String("cmd", "", "Command to use i.e. hpacucli/ssacli")
)
func init() {
flag.Usage = func() {
fmt.Println("Usage: hpsa_exporter [ ... ]\n\nParameters:")
fmt.Println()
flag.PrintDefaults()
}
}
func main() {
flag.Parse()
if *showVersion {
printVersion()
os.Exit(0)
}
startServer()
}
func printVersion() {
fmt.Println("hpsa_exporter")
fmt.Printf("Version: %s\n", version)
}
func startServer() {
log.Infof("Starting HPSA exporter (Version: %s)\n", version)
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(`<html>
<head><title>HPSA Exporter (Version ` + version + `)</title></head>
<body>
<h1>HPSA Exporter</h1>
<p><a href="` + *metricsPath + `">Metrics</a></p>
<h2>More information:</h2>
<p><a href="https://github.com/l3akage/hpsa_exporter">github.com/l3akage/hpsa_exporter</a></p>
</body>
</html>`))
})
http.HandleFunc(*metricsPath, handleMetricsRequest)
log.Infof("Listening for %s on %s\n", *metricsPath, *listenAddress)
log.Fatal(http.ListenAndServe(*listenAddress, nil))
}
func handleMetricsRequest(w http.ResponseWriter, r *http.Request) {
reg := prometheus.NewRegistry()
reg.MustRegister(&hpsaCollector{})
promhttp.HandlerFor(reg, promhttp.HandlerOpts{
ErrorLog: log.NewErrorLogger(),
ErrorHandling: promhttp.ContinueOnError}).ServeHTTP(w, r)
}