Merge pull request #104 from zwopir/feature/add_version_info

add version command line parameter and metric

Author: zwopir

main.go

@@ -13,10 +13,12 @@ import (
 	"github.com/go-kit/kit/log/level"
 	"github.com/justwatchcom/elasticsearch_exporter/collector"
 	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/common/version"
 )
 
 func main() {
 	var (
+		Name               = "elasticsearch_exporter"
 		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.")
 		esURI              = flag.String("es.uri", "http://localhost:9200", "HTTP API address of an Elasticsearch node.")
@@ -26,9 +28,15 @@ func main() {
 		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.")
+		showVersion        = flag.Bool("version", false, "Show version and exit")
 	)
 	flag.Parse()
 
+	if *showVersion {
+		fmt.Print(version.Print(Name))
+		os.Exit(0)
+	}
+
 	logger := log.NewLogfmtLogger(log.NewSyncWriter(os.Stdout))
 	logger = log.With(logger,
 		"ts", log.DefaultTimestampUTC,
@@ -54,6 +62,9 @@ func main() {
 		},
 	}
 
+	// version metric
+	versionMetric := version.NewCollector(Name)
+	prometheus.MustRegister(versionMetric)
 	prometheus.MustRegister(collector.NewClusterHealth(logger, httpClient, esURL))
 	prometheus.MustRegister(collector.NewNodes(logger, httpClient, esURL, *esAllNodes))
 	if *esExportIndices {

vendor/github.com/prometheus/common/version/info.go

@@ -80,6 +80,12 @@
 			"revision": "3233b24a36715a2fe36d162260457857a56d672d",
 			"revisionTime": "2017-06-15T07:20:16Z"
 		},
+		{
+			"checksumSHA1": "91KYK0SpvkaMJJA2+BcxbVnyRO0=",
+			"path": "github.com/prometheus/common/version",
+			"revision": "bc8b88226a1210b016e9993b1d75f858c9c8f778",
+			"revisionTime": "2017-08-30T19:05:55Z"
+		},
 		{
 			"checksumSHA1": "W218eJZPXJG783fUr/z6IaAZyes=",
 			"path": "github.com/prometheus/procfs",