135 lines
3.5 KiB
Go
135 lines
3.5 KiB
Go
package main
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import (
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"flag"
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"fmt"
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"log"
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"os"
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"os/signal"
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"syscall"
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)
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func main() {
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var oConfigPath string
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var oShowVersion bool
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var oListProcesses bool
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var oAddProcess string
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var oRemoveProcess string
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log.SetFlags(0)
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flag.StringVar(&oConfigPath, "config", "config.conf", "path to configuration file")
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flag.StringVar(&oConfigPath, "c", "config.conf", "path to configuration file (shorthand)")
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flag.BoolVar(&oShowVersion, "version", false, "show version")
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flag.BoolVar(&oShowVersion, "v", false, "show version (shorthand)")
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flag.BoolVar(&oListProcesses, "list", false, "list watched processes")
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flag.BoolVar(&oListProcesses, "l", false, "list watched processes (shorthand)")
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flag.StringVar(&oAddProcess, "add", "", "add process to list")
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flag.StringVar(&oAddProcess, "a", "", "add process to list (shorthand)")
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flag.StringVar(&oRemoveProcess, "remove", "", "remove process from list")
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flag.StringVar(&oRemoveProcess, "r", "", "remove process from list (shorthand)")
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flag.Parse()
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if oShowVersion {
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version()
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os.Exit(0)
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}
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conf, err := LoadConfiguration(oConfigPath)
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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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if oListProcesses {
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printWatchedProcesses(&conf.Processes)
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os.Exit(0)
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}
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if oAddProcess != "" {
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err := conf.AddProcess(oAddProcess, oConfigPath)
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if err != nil {
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log.Fatalf("Cannot add process: %s\n", err)
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}
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}
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if oRemoveProcess != "" {
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err := conf.RemoveProcess(oRemoveProcess, oConfigPath)
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if err != nil {
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log.Fatalf("Cannot remove process: %s\n", err)
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}
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}
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// If we modified a list then let's look for a running program and
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// send SIGHUP to it to reload a list. Here we assume that there
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// is only one process running, so we just filter our PID.
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if oAddProcess != "" || oRemoveProcess != "" {
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if err := conf.StoreConfiguration(oConfigPath); err != nil {
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log.Fatalf("Cannot write configuration. Error: %s\n", err)
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}
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pids, _ := GetProcessPIDs("httpprocwatchd")
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if pids != nil && len(pids) > 1 {
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var trgt_pid int
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if pids[0] == os.Getpid() {
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trgt_pid = pids[1]
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} else {
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trgt_pid = pids[0]
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}
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if proc, err := os.FindProcess(trgt_pid); err == nil {
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proc.Signal(syscall.SIGHUP)
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}
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}
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os.Exit(0)
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}
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srv := CreateAndStartHTTPServer(conf)
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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("httpprocwatchd 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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log.Println("Shutting down... ")
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ShutdownHTTPServer(srv)
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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(oConfigPath)
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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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// printWatchedProcesses prints a list of processes being watched.
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func printWatchedProcesses(processes *[]string) {
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for _, v := range *processes {
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fmt.Printf("%s, ", v)
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}
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fmt.Println()
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}
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// version prints information about program.
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func version() {
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fmt.Println("httpprocwatchd ver. 1.3.2")
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fmt.Println("Copyright (c) 2021,2022 Alexander \"Arav\" Andreev <me@arav.top>")
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fmt.Println("This program is licensed under terms of MIT+NIGGER license a copy")
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fmt.Println("of wich is located in /usr/share/licenses/httpprocwatchd/LICENSE.")
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}
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