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main.go
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main.go
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package main
import (
"flag"
"fmt"
"log"
"net/http"
_ "net/http/pprof"
"time"
"crypto/tls"
"crypto/x509"
"io/ioutil"
"github.com/prometheus/client_golang/prometheus"
)
const (
namespace = "elasticsearch"
indexHTML = `
<html>
<head>
<title>Elasticsearch Exporter</title>
</head>
<body>
<h1>Elasticsearch Exporter</h1>
<p>
<a href='%s'>Metrics</a>
</p>
</body>
</html>`
)
func main() {
var (
listenAddress = flag.String("web.listen-address", ":9108", "Address to listen on for web interface and telemetry.")
metricsPath = flag.String("web.telemetry-path", "/metrics", "Path under which to expose metrics.")
esHostname = flag.String("es.hostname", "localhost", "hostname of an Elasticsearch node, where client http is enabled.")
esProtocol = flag.String("es.protocol", "http", "http/https protocol of an Elasticsearch node")
esPort = flag.String("es.port", "9200", "Port of an Elasticsearch node 9200 or 443")
esUser = flag.String("es.user", "", "HTTP username for basic auth of an Elasticsearch node.")
esPassword = flag.String("es.password", "", "HTTP password for basic auth of an Elasticsearch node.")
esTimeout = flag.Duration("es.timeout", 5*time.Second, "Timeout for trying to get stats from Elasticsearch.")
esAllNodes = flag.Bool("es.all", false, "Export stats for all nodes in the cluster.")
esCA = flag.String("es.ca", "", "Path to PEM file that conains trusted CAs for the Elasticsearch connection.")
esClientPrivateKey = flag.String("es.client-private-key", "", "Path to PEM file that conains the private key for client auth when connecting to Elasticsearch.")
esClientCert = flag.String("es.client-cert", "", "Path to PEM file that conains the corresponding cert for the private key to connect to Elasticsearch.")
)
flag.Parse()
var authString string
if *esUser != "" && *esPassword != "" {
authString = *esUser + ":" + *esPassword + "@"
} else {
authString = ""
}
nodesStatsURI := *esProtocol + ":https://" + authString + *esHostname + ":" + *esPort + "/_nodes/_local/stats"
if *esAllNodes {
nodesStatsURI = *esProtocol + ":https://" + authString + *esHostname + ":" + *esPort + "/_nodes/stats"
}
clusterHealthURI := *esProtocol + ":https://" + *esHostname + ":" + *esPort + "/_cluster/health"
exporter := NewExporter(nodesStatsURI, clusterHealthURI, *esTimeout, *esAllNodes, createElasticSearchTLSConfig(*esCA, *esClientCert, *esClientPrivateKey))
prometheus.MustRegister(exporter)
log.Println("Starting Server:", *listenAddress)
http.Handle(*metricsPath, prometheus.Handler())
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
w.Write([]byte(fmt.Sprintf(indexHTML, *metricsPath)))
})
log.Fatal(http.ListenAndServe(*listenAddress, nil))
}
func createElasticSearchTLSConfig(pemFile, pemCertFile, pemPrivateKeyFile string) *tls.Config {
if len(pemFile) <= 0 {
return nil
}
rootCerts, err := loadCertificatesFrom(pemFile)
if err != nil {
log.Fatalf("Couldn't load root certificate from %s. Got %s.", pemFile, err)
}
if len(pemCertFile) > 0 && len(pemPrivateKeyFile) > 0 {
clientPrivateKey, err := loadPrivateKeyFrom(pemCertFile, pemPrivateKeyFile)
if err != nil {
log.Fatalf("Couldn't setup client authentication. Got %s.", err)
}
return &tls.Config{
RootCAs: rootCerts,
Certificates: []tls.Certificate{*clientPrivateKey},
}
}
return &tls.Config{
RootCAs: rootCerts,
}
}
func loadCertificatesFrom(pemFile string) (*x509.CertPool, error) {
caCert, err := ioutil.ReadFile(pemFile)
if err != nil {
return nil, err
}
certificates := x509.NewCertPool()
certificates.AppendCertsFromPEM(caCert)
return certificates, nil
}
func loadPrivateKeyFrom(pemCertFile, pemPrivateKeyFile string) (*tls.Certificate, error) {
privateKey, err := tls.LoadX509KeyPair(pemCertFile, pemPrivateKeyFile)
if err != nil {
return nil, err
}
return &privateKey, nil
}