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main.go
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main.go
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package main
import (
"bytes"
"flag"
"fmt"
"io/ioutil"
"net/http"
"os"
"strings"
"github.com/czerwonk/junos_exporter/config"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/prometheus/common/log"
)
const version string = "0.7.1"
var (
showVersion = flag.Bool("version", false, "Print version information.")
listenAddress = flag.String("web.listen-address", ":9326", "Address on which to expose metrics and web interface.")
metricsPath = flag.String("web.telemetry-path", "/metrics", "Path under which to expose metrics.")
sshHosts = flag.String("ssh.targets", "", "Hosts to scrape")
sshUsername = flag.String("ssh.user", "junos_exporter", "Username to use when connecting to junos devices using ssh")
sshKeyFile = flag.String("ssh.keyfile", "junos_exporter", "Public key file to use when connecting to junos devices using ssh")
debug = flag.Bool("debug", false, "Show verbose debug output in log")
bgpEnabled = flag.Bool("bgp.enabled", true, "Scrape BGP metrics")
ospfEnabled = flag.Bool("ospf.enabled", true, "Scrape OSPFv3 metrics")
isisEnabled = flag.Bool("isis.enabled", false, "Scrape ISIS metrics")
l2circuitEnabled = flag.Bool("l2circuit.enabled", false, "Scrape l2circuit metrics")
routingEngineEnabled = flag.Bool("routingengine.enabled", true, "Scrape Routing Engine metrics")
routesEnabled = flag.Bool("routes.enabled", true, "Scrape routing table metrics")
environmentEnabled = flag.Bool("environment.enabled", true, "Scrape environment metrics")
interfacesEnabled = flag.Bool("interfaces.enabled", true, "Scrape interface metrics")
interfaceDiagnosticsEnabled = flag.Bool("ifdiag.enabled", true, "Scrape optical interface diagnostic metrics")
alarmFilter = flag.String("alarms.filter", "", "Regex to filter for alerts to ignore")
configFile = flag.String("config.file", "", "Path to config file")
cfg *config.Config
)
func init() {
flag.Usage = func() {
fmt.Println("Usage: junos_exporter [ ... ]\n\nParameters:")
fmt.Println()
flag.PrintDefaults()
}
}
func main() {
flag.Parse()
if *showVersion {
printVersion()
os.Exit(0)
}
c, err := loadConfig()
if err != nil {
log.Fatalf("could not load config file. %v", err)
}
cfg = c
startServer()
}
func printVersion() {
fmt.Println("junos_exporter")
fmt.Printf("Version: %s\n", version)
fmt.Println("Author(s): Daniel Czerwonk")
fmt.Println("Metric exporter for switches and routers running JunOS")
}
func loadConfig() (*config.Config, error) {
if len(*configFile) == 0 {
return loadConfigFromFlags(), nil
}
log.Infoln("Loading config from", *configFile)
b, err := ioutil.ReadFile(*configFile)
if err != nil {
return nil, err
}
return config.Load(bytes.NewReader(b))
}
func loadConfigFromFlags() *config.Config {
c := config.New()
c.Targets = strings.Split(*sshHosts, ",")
f := &c.Features
f.BGP = *bgpEnabled
f.Environment = *environmentEnabled
f.Interfaces = *interfacesEnabled
f.InterfaceDiagnostic = *interfaceDiagnosticsEnabled
f.ISIS = *isisEnabled
f.OSPF = *ospfEnabled
f.L2Circuit = *l2circuitEnabled
f.Routes = *routesEnabled
f.RoutingEngine = *routingEngineEnabled
return c
}
func startServer() {
log.Infof("Starting JunOS exporter (Version: %s)\n", version)
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(`<html>
<head><title>JunOS Exporter (Version ` + version + `)</title></head>
<body>
<h1>JunOS Exporter</h1>
<p><a href="` + *metricsPath + `">Metrics</a></p>
<h2>More information:</h2>
<p><a href="https://github.com/czerwonk/junos_exporter">github.com/czerwonk/junos_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()
targets, err := targetsForRequest(r)
if err != nil {
http.Error(w, err.Error(), 400)
return
}
c := newJunosCollector(targets)
reg.MustRegister(c)
promhttp.HandlerFor(reg, promhttp.HandlerOpts{
ErrorLog: log.NewErrorLogger(),
ErrorHandling: promhttp.ContinueOnError}).ServeHTTP(w, r)
}
func targetsForRequest(r *http.Request) ([]string, error) {
reqTarget := r.URL.Query().Get("target")
if reqTarget == "" {
return cfg.Targets, nil
}
for _, t := range cfg.Targets {
if t == reqTarget {
return []string{t}, nil
}
}
return nil, fmt.Errorf("the target '%s' is not defined in the configuration file", reqTarget)
}