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main.go
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package main
import (
"flag"
"io"
"log"
"net/http"
"os"
"os/signal"
"syscall"
"log/slog"
"github.com/flxpeters/redfish_exporter/collector"
kitlog "github.com/go-kit/log"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/prometheus/exporter-toolkit/web"
)
var (
webConfig = flag.String("web.config", "", "Path to web configuration file.")
configFile = flag.String("config.file", "config.yml", "Path to configuration file.")
listenAddress = flag.String(
"web.listen-address",
":9610",
"Address to listen on for web interface and telemetry.",
)
config = &SafeConfig{
Config: &Config{},
}
reloadCh chan chan error
)
func reloadHandler() http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if r.Method == "POST" || r.Method == "PUT" {
slog.Info("Triggered configuration reload from /-/reload HTTP endpoint")
err := config.ReloadConfig(*configFile)
if err != nil {
slog.Error("failed to reload config file", slog.Any("error", err))
http.Error(w, "failed to reload config file", http.StatusInternalServerError)
}
slog.Info("config file reloaded", slog.String("operation", "sc.ReloadConfig"))
w.WriteHeader(http.StatusOK)
_, err = io.WriteString(w, "Configuration reloaded successfully!")
if err != nil {
slog.Warn("failed to send configuration reload status message")
}
} else {
http.Error(w, "Only PUT and POST methods are allowed", http.StatusBadRequest)
}
}
}
// define new http handleer
func metricsHandler() http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
registry := prometheus.NewRegistry()
target := r.URL.Query().Get("target")
if target == "" {
http.Error(w, "'target' parameter must be specified", 400)
return
}
slog.Info("Scraping target host", slog.String("target", target))
var (
hostConfig *HostConfig
err error
ok bool
group []string
)
group, ok = r.URL.Query()["group"]
if ok && len(group[0]) >= 1 {
// Trying to get hostConfig from group.
if hostConfig, err = config.HostConfigForGroup(group[0]); err != nil {
slog.Error("error getting credentials", slog.Any("error", err))
return
}
}
// Always falling back to single host config when group config failed.
if hostConfig == nil {
if hostConfig, err = config.HostConfigForTarget(target); err != nil {
slog.Error("error getting credentials", slog.Any("error", err))
return
}
}
collector := collector.NewRedfishCollector(target, hostConfig.Username, hostConfig.Password)
registry.MustRegister(collector)
gatherers := prometheus.Gatherers{
prometheus.DefaultGatherer,
registry,
}
// Delegate http serving to Prometheus client library, which will call collector.Collect.
h := promhttp.HandlerFor(gatherers, promhttp.HandlerOpts{})
h.ServeHTTP(w, r)
}
}
// Parse the log leven from input
func parseLogLevel(level string) slog.Level {
ret := slog.LevelInfo
switch level {
case "debug":
ret = slog.LevelDebug
case "info":
ret = slog.LevelInfo
case "warn":
ret = slog.LevelWarn
case "error":
ret = slog.LevelError
default:
slog.Warn("Invalid loglevel provided. Fallback to default")
}
return ret
}
func main() {
slog.Info("Starting redfish_exporter")
flag.Parse()
kitlogger := kitlog.NewLogfmtLogger(os.Stderr)
// load config first time
if err := config.ReloadConfig(*configFile); err != nil {
slog.Error("Error parsing config file", slog.Any("error", err))
panic(err)
}
// Setup dinal logger from config
opts := &slog.HandlerOptions{
Level: parseLogLevel(config.Config.Loglevel),
}
logger := slog.New(slog.NewTextHandler(os.Stdout, opts))
slog.SetDefault(logger)
slog.Info("Config successfuly parsed", slog.String("loglevel", opts.Level.Level().String()))
// load config in background to watch for config changes
hup := make(chan os.Signal, 1)
reloadCh = make(chan chan error)
signal.Notify(hup, syscall.SIGHUP)
go func() {
for {
select {
case <-hup:
if err := config.ReloadConfig(*configFile); err != nil {
slog.Error("failed to reload config file", slog.Any("error", err))
break
}
slog.Info("config file reload", slog.String("operation", "sc.ReloadConfig"))
case rc := <-reloadCh:
if err := config.ReloadConfig(*configFile); err != nil {
slog.Error("failed to reload config file", slog.Any("error", err))
rc <- err
break
}
slog.Info("config file reloaded", slog.String("operation", "sc.ReloadConfig"))
rc <- nil
}
}
}()
http.Handle("/redfish", metricsHandler()) // Regular metrics endpoint for local Redfish metrics.
http.Handle("/-/reload", reloadHandler()) // HTTP endpoint for triggering configuration reload
http.Handle("/metrics", promhttp.Handler())
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
// nolint
w.Write([]byte(`<html>
<head>
<title>Redfish Exporter</title>
</head>
<body>
<h1>redfish Exporter</h1>
<form action="/redfish">
<label>Target:</label> <input type="text" name="target" placeholder="X.X.X.X" value="1.2.3.4"><br>
<label>Group:</label> <input type="text" name="group" placeholder="group (optional)" value=""><br>
<input type="submit" value="Submit">
</form>
<p><a href="/metrics">Local metrics</a></p>
</body>
</html>`))
})
slog.Info("Exporter started", slog.String("listenAddress", *listenAddress))
srv := &http.Server{Addr: *listenAddress}
err := web.ListenAndServe(srv, *webConfig, kitlogger)
if err != nil {
log.Fatal(err)
}
}