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main.go
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package main
import (
"net/http"
_ "net/http/pprof"
vault_api "github.com/hashicorp/vault/api"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/prometheus/common/log"
"github.com/prometheus/common/version"
kingpin "gopkg.in/alecthomas/kingpin.v2"
)
const (
namespace = "vault"
)
var (
up = prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "up"),
"Was the last query of Vault successful.",
nil, nil,
)
initialized = prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "initialized"),
"Is the Vault initialised (according to this node).",
nil, nil,
)
sealed = prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "sealed"),
"Is the Vault node sealed.",
nil, nil,
)
standby = prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "standby"),
"Is this Vault node in standby.",
nil, nil,
)
info = prometheus.NewDesc(
prometheus.BuildFQName(namespace, "", "info"),
"Version of this Vault node.",
[]string{"version", "cluster_name", "cluster_id"}, nil,
)
)
// Exporter collects Vault health from the given server and exports them using
// the Prometheus metrics package.
type Exporter struct {
client *vault_api.Client
}
// NewExporter returns an initialized Exporter.
func NewExporter(config vault_api.Config) (*Exporter, error) {
client, err := vault_api.NewClient(&config)
if err != nil {
return nil, err
}
return &Exporter{
client: client,
}, nil
}
// Describe describes all the metrics ever exported by the Vault exporter. It
// implements prometheus.Collector.
func (e *Exporter) Describe(ch chan<- *prometheus.Desc) {
ch <- up
ch <- initialized
ch <- sealed
ch <- standby
ch <- info
}
func bool2float(b bool) float64 {
if b {
return 1
}
return 0
}
// Collect fetches the stats from configured Vault and delivers them
// as Prometheus metrics. It implements prometheus.Collector.
func (e *Exporter) Collect(ch chan<- prometheus.Metric) {
health, err := e.client.Sys().Health()
if err != nil {
ch <- prometheus.MustNewConstMetric(
up, prometheus.GaugeValue, 0,
)
log.Errorf("Failted to collect health from Vault server: %v", err)
return
}
ch <- prometheus.MustNewConstMetric(
up, prometheus.GaugeValue, 1,
)
ch <- prometheus.MustNewConstMetric(
initialized, prometheus.GaugeValue, bool2float(health.Initialized),
)
ch <- prometheus.MustNewConstMetric(
sealed, prometheus.GaugeValue, bool2float(health.Sealed),
)
ch <- prometheus.MustNewConstMetric(
standby, prometheus.GaugeValue, bool2float(health.Standby),
)
ch <- prometheus.MustNewConstMetric(
info, prometheus.GaugeValue, 1, health.Version, health.ClusterName, health.ClusterID,
)
}
func init() {
prometheus.MustRegister(version.NewCollector("vault_exporter"))
}
func main() {
var (
listenAddress = kingpin.Flag("web.listen-address",
"Address to listen on for web interface and telemetry.").
Default(":9410").String()
metricsPath = kingpin.Flag("web.telemetry-path",
"Path under which to expose metrics.").
Default("/metrics").String()
vaultAddress = kingpin.Flag("cfg.vault-server",
"Vault server address").
Default("http://127.0.0.1:8200/").String()
)
kingpin.Version(version.Print("vault_exporter"))
kingpin.HelpFlag.Short('h')
kingpin.Parse()
log.Infoln("Starting vault_exporter", version.Info())
log.Infoln("Build context", version.BuildContext())
log.Infoln("Vault address", *vaultAddress)
exporter, err := NewExporter(vault_api.Config{ Address: *vaultAddress})
if err != nil {
log.Fatalln(err)
}
prometheus.MustRegister(exporter)
http.Handle(*metricsPath, promhttp.Handler())
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
_, err := w.Write([]byte(`<html>
<head><title>Vault Exporter</title></head>
<body>
<h1>Vault Exporter</h1>
<p><a href='` + *metricsPath + `'>Metrics</a></p>
<h2>Build</h2>
<pre>` + version.Info() + ` ` + version.BuildContext() + `</pre>
</body>
</html>`))
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
}
})
log.Infoln("Listening on", *listenAddress)
log.Fatal(http.ListenAndServe(*listenAddress, nil))
}