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main.go
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package main
import (
"bytes"
"flag"
"fmt"
"io/ioutil"
"net/http"
"os"
"github.com/lwlcom/cisco_exporter/config"
"github.com/lwlcom/cisco_exporter/connector"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
log "github.com/sirupsen/logrus"
)
const version string = "0.2"
var (
showVersion = flag.Bool("version", false, "Print version information.")
listenAddress = flag.String("web.listen-address", ":9362", "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", "", "SSH Hosts to scrape")
sshUsername = flag.String("ssh.user", "cisco_exporter", "Username to use for SSH connection")
sshPassword = flag.String("ssh.password", "", "Password to use for SSH connection")
sshKeyFile = flag.String("ssh.keyfile", "", "Key file to use for SSH connection")
sshTimeout = flag.Int("ssh.timeout", 5, "Timeout to use for SSH connection")
sshBatchSize = flag.Int("ssh.batch-size", 10000, "The SSH response batch size")
debug = flag.Bool("debug", false, "Show verbose debug output in log")
legacyCiphers = flag.Bool("legacy.ciphers", false, "Allow legacy CBC ciphers")
bgpEnabled = flag.Bool("bgp.enabled", true, "Scrape bgp metrics")
environmentEnabled = flag.Bool("environment.enabled", true, "Scrape environment metrics")
factsEnabled = flag.Bool("facts.enabled", true, "Scrape system metrics")
interfacesEnabled = flag.Bool("interfaces.enabled", true, "Scrape interface metrics")
opticsEnabled = flag.Bool("optics.enabled", true, "Scrape optic metrics")
configFile = flag.String("config.file", "", "Path to config file")
devices []*connector.Device
cfg *config.Config
)
func init() {
flag.Usage = func() {
fmt.Println("Usage: cisco_exporter [ ... ]\n\nParameters:")
fmt.Println()
flag.PrintDefaults()
}
}
func main() {
flag.Parse()
if *showVersion {
printVersion()
os.Exit(0)
}
err := initialize()
if err != nil {
log.Fatalf("could not initialize exporter. %v", err)
}
startServer()
}
func loadConfig() (*config.Config, error) {
if len(*configFile) == 0 {
log.Infoln("Loading config flags")
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 initialize() error {
c, err := loadConfig()
if err != nil {
return err
}
devices, err = devicesForConfig(c)
if err != nil {
return err
}
cfg = c
return nil
}
func loadConfigFromFlags() *config.Config {
c := config.New()
c.Debug = *debug
c.LegacyCiphers = *legacyCiphers
c.Timeout = *sshTimeout
c.BatchSize = *sshBatchSize
c.Username = *sshUsername
c.Password = *sshPassword
c.KeyFile = *sshKeyFile
c.DevicesFromTargets(*sshHosts)
f := c.Features
f.BGP = bgpEnabled
f.Environment = environmentEnabled
f.Facts = factsEnabled
f.Interfaces = interfacesEnabled
f.Optics = opticsEnabled
return c
}
func printVersion() {
fmt.Println("cisco_exporter")
fmt.Printf("Version: %s\n", version)
fmt.Println("Author(s): Martin Poppen")
fmt.Println("Metric exporter for switches and routers running cisco IOS/NX-OS/IOS-XE")
}
func startServer() {
log.Infof("Starting Cisco exporter (Version: %s)\n", version)
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(`<html>
<head><title>Cisco Exporter (Version ` + version + `)</title></head>
<body>
<h1>Cisco Exporter</h1>
<p><a href="` + *metricsPath + `">Metrics</a></p>
<h2>More information:</h2>
<p><a href="https://github.com/lwlcom/cisco_exporter">github.com/lwlcom/cisco_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()
c := newCiscoCollector(devices)
reg.MustRegister(c)
l := log.New()
l.Level = log.ErrorLevel
promhttp.HandlerFor(reg, promhttp.HandlerOpts{
ErrorLog: l,
ErrorHandling: promhttp.ContinueOnError}).ServeHTTP(w, r)
}