77 lines
1.8 KiB
Go
77 lines
1.8 KiB
Go
package main
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import (
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"context"
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"flag"
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"fmt"
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"log"
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"net/http"
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"os"
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"os/signal"
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"syscall"
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"time"
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)
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var configPath *string = flag.String("c", "config.json", "path to configuration file")
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var showVersion *bool = flag.Bool("v", false, "show version")
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var version string
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func main() {
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log.SetFlags(0)
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flag.Parse()
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if *showVersion {
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fmt.Println("httpprocprobed ver.", version, "Copyright (c) 2021-2023 Alexander \"Arav\" Andreev <me@arav.su>")
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os.Exit(0)
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}
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conf, err := LoadConfiguration(*configPath)
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if err != nil {
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log.Fatalf("Cannot load configuration file: %s\n", err)
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}
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router := http.NewServeMux()
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router.HandleFunc("/processes", AreProcessesUp(&conf.Processes))
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srv := &http.Server{
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Addr: conf.ListenAddress,
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Handler: router,
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ReadTimeout: 5 * time.Second,
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WriteTimeout: 5 * time.Second,
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IdleTimeout: 10 * time.Second,
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}
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go func() {
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if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
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log.Fatalf("ListenAndServe: %s\n", err)
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}
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}()
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syssignal := make(chan os.Signal, 1)
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signal.Notify(syssignal, os.Interrupt, syscall.SIGINT, syscall.SIGTERM, syscall.SIGHUP)
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log.Printf("httpprocprobed is running on \"%s\".", conf.ListenAddress)
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for {
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switch <-syssignal {
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case os.Interrupt:
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fallthrough
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case syscall.SIGINT | syscall.SIGTERM:
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srv.SetKeepAlivesEnabled(false)
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if err := srv.Shutdown(context.Background()); err != nil {
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log.Fatalf("%s\n", err)
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}
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log.Println("Server shutted down.")
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os.Exit(0)
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case syscall.SIGHUP:
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newconf, err := LoadConfiguration(*configPath)
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if err != nil {
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log.Fatalf("Failed to reload a list of processes from configuration: %s\n", err)
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}
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conf.Processes = newconf.Processes
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log.Println("Successfully reloaded a list of watched processes.")
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}
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}
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}
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