initial makefile

Makefile

@@ -0,0 +1,14 @@
+VERSION = 0.1
+
+build:
+	gox -os="linux darwin windows" -arch="amd64" -verbose \
+	    -ldflags "-X main.buildCommit=`git rev-parse --short HEAD` \
+	              -X main.buildDate=`date +%Y-%m-%d` \
+	              -X main.buildVersion=$(VERSION)" \
+	    ./...
+
+before_build:
+	go get github.com/mitchellh/gox
+
+lint:
+	golangci-lint run *.go

go.mod

@@ -48,6 +48,7 @@ require (
 	github.com/mattn/go-colorable v0.1.2 // indirect
 	github.com/mattn/go-runewidth v0.0.4 // indirect
 	github.com/mdempsky/gocode v0.0.0-20190203001940-7fb65232883f // indirect
+	github.com/mitchellh/gox v1.0.1 // indirect
 	github.com/nbutton23/zxcvbn-go v0.0.0-20180912185939-ae427f1e4c1d // indirect
 	github.com/onsi/ginkgo v1.8.0 // indirect
 	github.com/onsi/gomega v1.5.0 // indirect

go.sum

@@ -178,6 +178,8 @@ github.com/grpc-ecosystem/go-grpc-middleware v1.0.0/go.mod h1:FiyG127CGDf3tlThmg
 github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0/go.mod h1:8NvIoxWQoOIhqOTXgfV/d3M/q6VIi02HzZEHgUlZvzk=
 github.com/grpc-ecosystem/grpc-gateway v1.9.0/go.mod h1:vNeuVxBJEsws4ogUvrchl83t/GYV9WGTSLVdBhOQFDY=
 github.com/grpc-ecosystem/grpc-gateway v1.9.2/go.mod h1:vNeuVxBJEsws4ogUvrchl83t/GYV9WGTSLVdBhOQFDY=
+github.com/hashicorp/go-version v1.0.0 h1:21MVWPKDphxa7ineQQTrCU5brh7OuVVAzGOCnnCPtE8=
+github.com/hashicorp/go-version v1.0.0/go.mod h1:fltr4n8CU8Ke44wwGCBoEymUuxUHl09ZGVZPK5anwXA=
 github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
 github.com/hashicorp/golang-lru v0.5.1/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
 github.com/hashicorp/hcl v0.0.0-20180404174102-ef8a98b0bbce/go.mod h1:oZtUIOe8dh44I2q6ScRibXws4Ajl+d+nod3AaR9vL5w=
@@ -245,6 +247,10 @@ github.com/mitchellh/go-homedir v1.0.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrk
 github.com/mitchellh/go-homedir v1.1.0 h1:lukF9ziXFxDFPkA1vsr5zpc1XuPDn/wFntq5mG+4E0Y=
 github.com/mitchellh/go-homedir v1.1.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
 github.com/mitchellh/go-ps v0.0.0-20170309133038-4fdf99ab2936/go.mod h1:r1VsdOzOPt1ZSrGZWFoNhsAedKnEd6r9Np1+5blZCWk=
+github.com/mitchellh/gox v1.0.1 h1:x0jD3dcHk9a9xPSDN6YEL4xL6Qz0dvNYm8yZqui5chI=
+github.com/mitchellh/gox v1.0.1/go.mod h1:ED6BioOGXMswlXa2zxfh/xdd5QhwYliBFn9V18Ap4z4=
+github.com/mitchellh/iochan v1.0.0 h1:C+X3KsSTLFVBr/tK1eYN/vs4rJcvsiLU338UhYPJWeY=
+github.com/mitchellh/iochan v1.0.0/go.mod h1:JwYml1nuB7xOzsp52dPpHFffvOCDupsG0QubkSMEySY=
 github.com/mitchellh/mapstructure v0.0.0-20180220230111-00c29f56e238/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=
 github.com/mitchellh/mapstructure v1.1.2 h1:fmNYVwqnSfB9mZU6OS2O6GsXM+wcskZDuKQzvN1EDeE=
 github.com/mitchellh/mapstructure v1.1.2/go.mod h1:FVVH3fgwuzCH5S8UJGiWEs2h04kUh9fWfEaFds41c1Y=

main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"fmt"
 	"log"
 	"net/http"
 	"os"
@@ -11,17 +12,24 @@ import (
 )
 
 var opts struct {
-	Listen string `short:"l" long:"listen" description:"Listen address" value-name:"[HOST]:PORT" default:":8080"`
-	Period uint   `short:"p" long:"period" description:"Period in seconds, should match Prometheus scrape interval" value-name:"SECS" default:"60"`
-	Fping  string `short:"f" long:"fping"  description:"Fping binary path" value-name:"PATH" default:"/usr/bin/fping"`
-	Count  uint   `short:"c" long:"count"  description:"Number of pings to send at each period" value-name:"N" default:"20"`
+	Listen  string `short:"l" long:"listen" description:"Listen address" value-name:"[HOST]:PORT" default:":8080"`
+	Period  uint   `short:"p" long:"period" description:"Period in seconds, should match Prometheus scrape interval" value-name:"SECS" default:"60"`
+	Fping   string `short:"f" long:"fping"  description:"Fping binary path" value-name:"PATH" default:"/usr/bin/fping"`
+	Count   uint   `short:"c" long:"count"  description:"Number of pings to send at each period" value-name:"N" default:"20"`
+	Version bool   `long:"version" description:"Show version"`
 }
 
+var (
+	buildVersion = "dev"
+	buildCommit  = "none"
+	buildDate    = "unknown"
+)
+
 func probeHandler(w http.ResponseWriter, r *http.Request) {
 	targetParam := r.URL.Query().Get("target")
 	if targetParam == "" {
 		w.Header().Set("Content-Type", "text/html")
-		w.Write([]byte(`<html>
+		_, _ = w.Write([]byte(`<html>
 		    <head><title>Fping Exporter</title></head>
 			<body>
 			<b>ERROR: missing target parameter</b>
@@ -31,7 +39,7 @@ func probeHandler(w http.ResponseWriter, r *http.Request) {
 
 	target := GetTarget(
 		WorkerSpec{
-			period: time.Second * 60,
+			period: time.Second * time.Duration(opts.Period),
 		},
 		TargetSpec{
 			host: targetParam,
@@ -46,6 +54,10 @@ func main() {
 	if _, err := flags.Parse(&opts); err != nil {
 		os.Exit(0)
 	}
+	if opts.Version {
+		fmt.Printf("fping-exporter %v (commit %v, built %v)\n", buildVersion, buildCommit, buildDate)
+		os.Exit(0)
+	}
 	http.Handle("/metrics", promhttp.Handler())
 	http.HandleFunc("/probe", probeHandler)
 	log.Fatal(http.ListenAndServe(opts.Listen, nil))