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main.go
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main.go
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package main
import (
"flag"
"fmt"
"net/http"
"os"
"strconv"
"strings"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/rokett/citrix-netscaler-exporter/collector"
)
var (
app = "Citrix-NetScaler-Exporter"
version string
build string
username = flag.String("username", "", "Username with which to connect to the NetScaler API")
password = flag.String("password", "", "Password with which to connect to the NetScaler API")
bindPort = flag.Int("bind_port", 9280, "Port to bind the exporter endpoint to")
versionFlg = flag.Bool("version", false, "Display application version")
logger log.Logger
nsInstance string
)
func init() {
logger = log.NewLogfmtLogger(os.Stdout)
logger = log.With(logger, "ts", log.DefaultTimestampUTC, "caller", log.DefaultCaller, "app", app, "bind_port", *bindPort, "version", "v"+version, "build", build)
}
func main() {
flag.Parse()
if *versionFlg {
fmt.Printf("%s v%s build %s\n", app, version, build)
os.Exit(0)
}
if *username == "" || *password == "" {
flag.PrintDefaults()
os.Exit(1)
}
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(`<html>
<head><title>Citrix NetScaler Exporter</title></head>
<style>
label{
display:inline-block;
width:75px;
}
form label {
margin: 10px;
}
form input {
margin: 10px;
}
</style>
<body>
<h1>Citrix NetScaler Exporter</h1>
<form action="/netscaler">
<label>Target:</label> <input type="text" name="target" placeholder="https://netscaler.domain.tld"> <br>
<p>Ignore certificate check?</p>
<input type="radio" id="yes" name="ignore-cert" value="yes">
<label for="yes">Yes</label>
<input type="radio" id="no" name="ignore-cert" value="no" checked>
<label for="no">No</label>
<br>
<input type="submit" value="Submit">
</form>
</body>
</html>`))
})
http.HandleFunc("/netscaler", handler)
http.Handle("/metrics", promhttp.Handler())
listeningPort := ":" + strconv.Itoa(*bindPort)
level.Info(logger).Log("msg", "Listening on port "+listeningPort)
err := http.ListenAndServe(listeningPort, nil)
if err != nil {
level.Error(logger).Log("msg", err)
os.Exit(1)
}
}
func handler(w http.ResponseWriter, r *http.Request) {
target := r.URL.Query().Get("target")
if target == "" {
http.Error(w, "'target' parameter must be specified", 400)
return
}
ignoreCertCheck := false
if strings.ToLower(r.URL.Query().Get("ignore-cert")) == "yes" {
ignoreCertCheck = true
}
nsInstance = strings.TrimLeft(target, "https://")
nsInstance = strings.TrimLeft(nsInstance, "http://")
nsInstance = strings.Trim(nsInstance, " /")
level.Debug(logger).Log("msg", "scraping target", "target", target)
exporter, err := collector.NewExporter(target, *username, *password, ignoreCertCheck, logger, nsInstance)
if err != nil {
http.Error(w, "Error creating exporter"+err.Error(), 400)
level.Error(logger).Log("msg", err)
return
}
registry := prometheus.NewRegistry()
registry.MustRegister(exporter)
// Delegate http serving to Prometheus client library, which will call collector.Collect.
h := promhttp.HandlerFor(registry, promhttp.HandlerOpts{})
h.ServeHTTP(w, r)
}