config: add reusable exporter config package

go.mod

@@ -31,6 +31,8 @@ require (
 	howett.net/plist v1.0.1
 )
 
+replace github.com/prometheus/exporter-toolkit => /Users/nicolastakashi/workspace/github.com/nicolastakashi/prometheus/exporter-toolkit
+
 require (
 	cyphar.com/go-pathrs v0.2.2 // indirect
 	github.com/alecthomas/units v0.0.0-20240927000941-0f3dac36c52b // indirect

go.sum

@@ -82,8 +82,6 @@ github.com/prometheus/client_model v0.6.2 h1:oBsgwpGs7iVziMvrGhE53c/GrLUsZdHnqNw
 github.com/prometheus/client_model v0.6.2/go.mod h1:y3m2F6Gdpfy6Ut/GBsUqTWZqCUvMVzSfMLjcu6wAwpE=
 github.com/prometheus/common v0.67.5 h1:pIgK94WWlQt1WLwAC5j2ynLaBRDiinoAb86HZHTUGI4=
 github.com/prometheus/common v0.67.5/go.mod h1:SjE/0MzDEEAyrdr5Gqc6G+sXI67maCxzaT3A2+HqjUw=
-github.com/prometheus/exporter-toolkit v0.16.0 h1:xT/j7L2XKF+VJd6B4fpUw6xWabHrSmsUf6mYmFqyu0s=
-github.com/prometheus/exporter-toolkit v0.16.0/go.mod h1:d1EL8Z9674xQe/iWhwP2wDyCEoBPbXVeqDbqAUsgJWY=
 github.com/prometheus/procfs v0.20.1 h1:XwbrGOIplXW/AU3YhIhLODXMJYyC1isLFfYCsTEycfc=
 github.com/prometheus/procfs v0.20.1/go.mod h1:o9EMBZGRyvDrSPH1RqdxhojkuXstoe4UlK79eF5TGGo=
 github.com/safchain/ethtool v0.7.0 h1:rlJzfDetsVvT61uz8x1YIcFn12akMfuPulHtZjtb7Is=

node_exporter.go

@@ -24,17 +24,12 @@ import (
 	"slices"
 	"sort"
 
-	"github.com/prometheus/common/promslog"
-	"github.com/prometheus/common/promslog/flag"
-
 	"github.com/alecthomas/kingpin/v2"
 	"github.com/prometheus/client_golang/prometheus"
 	promcollectors "github.com/prometheus/client_golang/prometheus/collectors"
 	versioncollector "github.com/prometheus/client_golang/prometheus/collectors/version"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
-	"github.com/prometheus/common/version"
-	"github.com/prometheus/exporter-toolkit/web"
-	"github.com/prometheus/exporter-toolkit/web/kingpinflag"
+	"github.com/prometheus/exporter-toolkit/bootstrap"
 
 	"github.com/prometheus/node_exporter/collector"
 )
@@ -181,71 +176,36 @@ func (h *handler) innerHandler(filters ...string) (http.Handler, error) {
 
 func main() {
 	var (
-		metricsPath = kingpin.Flag(
-			"web.telemetry-path",
-			"Path under which to expose metrics.",
-		).Default("/metrics").String()
-		disableExporterMetrics = kingpin.Flag(
-			"web.disable-exporter-metrics",
-			"Exclude metrics about the exporter itself (promhttp_*, process_*, go_*).",
-		).Bool()
-		maxRequests = kingpin.Flag(
-			"web.max-requests",
-			"Maximum number of parallel scrape requests. Use 0 to disable.",
-		).Default("40").Int()
 		disableDefaultCollectors = kingpin.Flag(
 			"collector.disable-defaults",
 			"Set all collectors to disabled by default.",
 		).Default("false").Bool()
 		maxProcs = kingpin.Flag(
 			"runtime.gomaxprocs", "The target number of CPUs Go will run on (GOMAXPROCS)",
 		).Envar("GOMAXPROCS").Default("1").Int()
-		toolkitFlags = kingpinflag.AddFlags(kingpin.CommandLine, ":9100")
 	)
 
-	promslogConfig := &promslog.Config{}
-	flag.AddFlags(kingpin.CommandLine, promslogConfig)
-	kingpin.Version(version.Print("node_exporter"))
 	kingpin.CommandLine.UsageWriter(os.Stdout)
-	kingpin.HelpFlag.Short('h')
-	kingpin.Parse()
-	logger := promslog.New(promslogConfig)
-
-	if *disableDefaultCollectors {
-		collector.DisableDefaultCollectors()
-	}
-	logger.Info("Starting node_exporter", "version", version.Info())
-	logger.Info("Build context", "build_context", version.BuildContext())
-	if user, err := user.Current(); err == nil && user.Uid == "0" {
-		logger.Warn("Node Exporter is running as root user. This exporter is designed to run as unprivileged user, root is not required.")
-	}
-	runtime.GOMAXPROCS(*maxProcs)
-	logger.Debug("Go MAXPROCS", "procs", runtime.GOMAXPROCS(0))
-
-	http.Handle(*metricsPath, newHandler(!*disableExporterMetrics, *maxRequests, logger))
-	if *metricsPath != "/" {
-		landingConfig := web.LandingConfig{
-			Name:        "Node Exporter",
-			Description: "Prometheus Node Exporter",
-			Version:     version.Info(),
-			Links: []web.LandingLinks{
-				{
-					Address: *metricsPath,
-					Text:    "Metrics",
-				},
-			},
-		}
-		landingPage, err := web.NewLandingPage(landingConfig)
-		if err != nil {
-			logger.Error(err.Error())
-			os.Exit(1)
-		}
-		http.Handle("/", landingPage)
-	}
-
-	server := &http.Server{}
-	if err := web.ListenAndServe(server, toolkitFlags, logger); err != nil {
-		logger.Error(err.Error())
+	runner := bootstrap.New(bootstrap.Config{
+		App:            kingpin.CommandLine,
+		Name:           "node_exporter",
+		Description:    "Prometheus Node Exporter",
+		DefaultAddress: ":9100",
+		MetricsHandlerFactory: func(b *bootstrap.Bootstrap) (http.Handler, error) {
+			if *disableDefaultCollectors {
+				collector.DisableDefaultCollectors()
+			}
+			if user, err := user.Current(); err == nil && user.Uid == "0" {
+				b.Logger.Warn("Node Exporter is running as root user. This exporter is designed to run as unprivileged user, root is not required.")
+			}
+			runtime.GOMAXPROCS(*maxProcs)
+			b.Logger.Debug("Go MAXPROCS", "procs", runtime.GOMAXPROCS(0))
+			return newHandler(!b.DisableExporterMetrics, b.MaxRequests, b.Logger), nil
+		},
+	})
+
+	if err := runner.Run(); err != nil {
+		fmt.Fprintln(os.Stderr, err)
 		os.Exit(1)
 	}
 }