mirror of
https://github.com/prometheus-community/windows_exporter
synced 2024-12-27 08:52:06 +00:00
258 lines
8.1 KiB
Go
258 lines
8.1 KiB
Go
//go:build windows
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package main
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import (
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"encoding/json"
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"fmt"
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"net/http"
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_ "net/http/pprof"
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"os"
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"os/user"
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"runtime"
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"sort"
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"strings"
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// Its important that we do these first so that we can register with the windows service control ASAP to avoid timeouts
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"github.com/prometheus-community/windows_exporter/pkg/initiate"
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winlog "github.com/prometheus-community/windows_exporter/pkg/log"
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"github.com/prometheus-community/windows_exporter/pkg/types"
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"github.com/prometheus-community/windows_exporter/pkg/utils"
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"github.com/prometheus-community/windows_exporter/pkg/wmi"
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"github.com/alecthomas/kingpin/v2"
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"github.com/go-kit/log/level"
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"github.com/prometheus-community/windows_exporter/pkg/collector"
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"github.com/prometheus-community/windows_exporter/pkg/config"
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"github.com/prometheus-community/windows_exporter/pkg/log/flag"
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"github.com/prometheus/common/version"
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"github.com/prometheus/exporter-toolkit/web"
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webflag "github.com/prometheus/exporter-toolkit/web/kingpinflag"
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)
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// Same struct prometheus uses for their /version endpoint.
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// Separate copy to avoid pulling all of prometheus as a dependency
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type prometheusVersion struct {
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Version string `json:"version"`
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Revision string `json:"revision"`
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Branch string `json:"branch"`
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BuildUser string `json:"buildUser"`
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BuildDate string `json:"buildDate"`
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GoVersion string `json:"goVersion"`
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}
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func main() {
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app := kingpin.New("windows_exporter", "A metrics collector for Windows.")
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var (
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configFile = app.Flag(
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"config.file",
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"YAML configuration file to use. Values set in this file will be overridden by CLI flags.",
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).String()
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insecure_skip_verify = app.Flag(
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"config.file.insecure-skip-verify",
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"Skip TLS verification in loading YAML configuration.",
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).Default("false").Bool()
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webConfig = webflag.AddFlags(app, ":9182")
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metricsPath = app.Flag(
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"telemetry.path",
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"URL path for surfacing collected metrics.",
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).Default("/metrics").String()
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disableExporterMetrics = app.Flag(
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"web.disable-exporter-metrics",
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"Exclude metrics about the exporter itself (promhttp_*, process_*, go_*).",
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).Bool()
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maxRequests = app.Flag(
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"telemetry.max-requests",
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"Maximum number of concurrent requests. 0 to disable.",
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).Default("5").Int()
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enabledCollectors = app.Flag(
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"collectors.enabled",
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"Comma-separated list of collectors to use. Use '[defaults]' as a placeholder for all the collectors enabled by default.").
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Default(types.DefaultCollectors).String()
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printCollectors = app.Flag(
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"collectors.print",
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"If true, print available collectors and exit.",
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).Bool()
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timeoutMargin = app.Flag(
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"scrape.timeout-margin",
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"Seconds to subtract from the timeout allowed by the client. Tune to allow for overhead or high loads.",
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).Default("0.5").Float64()
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)
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winlogConfig := &winlog.Config{}
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flag.AddFlags(app, winlogConfig)
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app.Version(version.Print("windows_exporter"))
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app.HelpFlag.Short('h')
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// Initialize collectors before loading and parsing CLI arguments
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collectors := collector.NewWithFlags(app)
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// Load values from configuration file(s). Executable flags must first be parsed, in order
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// to load the specified file(s).
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kingpin.MustParse(app.Parse(os.Args[1:]))
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logger, err := winlog.New(winlogConfig)
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if err != nil {
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_ = level.Error(logger).Log("err", err)
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os.Exit(1)
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}
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_ = level.Debug(logger).Log("msg", "Logging has Started")
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if *configFile != "" {
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resolver, err := config.NewResolver(*configFile, logger, *insecure_skip_verify)
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if err != nil {
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_ = level.Error(logger).Log("msg", "could not load config file", "err", err)
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os.Exit(1)
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}
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err = resolver.Bind(app, os.Args[1:])
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if err != nil {
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_ = level.Error(logger).Log("err", err)
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os.Exit(1)
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}
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// NOTE: This is temporary fix for issue #1092, calling kingpin.Parse
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// twice makes slices flags duplicate its value, this clean up
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// the first parse before the second call.
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*webConfig.WebListenAddresses = (*webConfig.WebListenAddresses)[1:]
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// Parse flags once more to include those discovered in configuration file(s).
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kingpin.MustParse(app.Parse(os.Args[1:]))
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logger, err = winlog.New(winlogConfig)
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if err != nil {
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_ = level.Error(logger).Log("err", err)
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os.Exit(1)
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}
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}
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if *printCollectors {
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collectorNames := collector.Available()
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sort.Strings(collectorNames)
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fmt.Printf("Available collectors:\n")
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for _, n := range collectorNames {
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fmt.Printf(" - %s\n", n)
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}
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return
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}
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if err = wmi.InitWbem(logger); err != nil {
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_ = level.Error(logger).Log("err", err)
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os.Exit(1)
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}
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enabledCollectorList := utils.ExpandEnabledCollectors(*enabledCollectors)
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collectors.Enable(enabledCollectorList)
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collectors.SetLogger(logger)
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// Initialize collectors before loading
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err = collectors.Build()
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if err != nil {
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_ = level.Error(logger).Log("msg", "Couldn't load collectors", "err", err)
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os.Exit(1)
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}
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if u, err := user.Current(); err != nil {
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_ = level.Warn(logger).Log("msg", "Unable to determine which user is running this exporter. More info: https://github.com/golang/go/issues/37348")
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} else {
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_ = level.Info(logger).Log("msg", fmt.Sprintf("Running as %v", u.Username))
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if strings.Contains(u.Username, "ContainerAdministrator") || strings.Contains(u.Username, "ContainerUser") {
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_ = level.Warn(logger).Log("msg", "Running as a preconfigured Windows Container user. This may mean you do not have Windows HostProcess containers configured correctly and some functionality will not work as expected.")
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}
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}
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_ = level.Info(logger).Log("msg", fmt.Sprintf("Enabled collectors: %v", strings.Join(enabledCollectorList, ", ")))
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http.HandleFunc(*metricsPath, withConcurrencyLimit(*maxRequests, collectors.BuildServeHTTP(*disableExporterMetrics, *timeoutMargin)))
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http.HandleFunc("/health", func(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", "application/json")
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_, err := fmt.Fprintln(w, `{"status":"ok"}`)
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if err != nil {
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_ = level.Debug(logger).Log("Failed to write to stream", "err", err)
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}
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})
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http.HandleFunc("/version", func(w http.ResponseWriter, r *http.Request) {
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// we can't use "version" directly as it is a package, and not an object that
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// can be serialized.
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err := json.NewEncoder(w).Encode(prometheusVersion{
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Version: version.Version,
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Revision: version.Revision,
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Branch: version.Branch,
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BuildUser: version.BuildUser,
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BuildDate: version.BuildDate,
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GoVersion: version.GoVersion,
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})
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if err != nil {
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http.Error(w, fmt.Sprintf("error encoding JSON: %s", err), http.StatusInternalServerError)
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}
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})
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if *metricsPath != "/" && *metricsPath != "" {
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landingConfig := web.LandingConfig{
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Name: "Windows Exporter",
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Description: "Prometheus Exporter for Windows servers",
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Version: version.Info(),
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Links: []web.LandingLinks{
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{
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Address: *metricsPath,
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Text: "Metrics",
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},
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{
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Address: "/health",
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Text: "Health Check",
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},
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{
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Address: "/version",
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Text: "Version Info",
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},
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},
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}
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landingPage, err := web.NewLandingPage(landingConfig)
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if err != nil {
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_ = level.Error(logger).Log("msg", "failed to generate landing page", "err", err)
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os.Exit(1)
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}
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http.Handle("/", landingPage)
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}
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_ = level.Info(logger).Log("msg", "Starting windows_exporter", "version", version.Info())
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_ = level.Info(logger).Log("msg", "Build context", "build_context", version.BuildContext())
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_ = level.Debug(logger).Log("msg", "Go MAXPROCS", "procs", runtime.GOMAXPROCS(0))
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go func() {
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server := &http.Server{}
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if err := web.ListenAndServe(server, webConfig, logger); err != nil {
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_ = level.Error(logger).Log("msg", "cannot start windows_exporter", "err", err)
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os.Exit(1)
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}
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}()
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for {
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if <-initiate.StopCh {
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_ = level.Info(logger).Log("msg", "Shutting down windows_exporter")
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break
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}
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}
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}
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func withConcurrencyLimit(n int, next http.HandlerFunc) http.HandlerFunc {
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if n <= 0 {
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return next
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}
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sem := make(chan struct{}, n)
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return func(w http.ResponseWriter, r *http.Request) {
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select {
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case sem <- struct{}{}:
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defer func() { <-sem }()
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default:
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w.WriteHeader(http.StatusServiceUnavailable)
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_, _ = w.Write([]byte("Too many concurrent requests"))
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return
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}
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next(w, r)
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}
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}
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