func init() {
dns.SetLookupHostFunction(dns.LookupHostCache)
}
func main() {
println("Starting monlite...")
// Configuration
var opts options
_, err := flags.Parse(&opts)
if err != nil {
log.Fatal("can't parse the command line options:", err)
}
cfg, err := ini.Load(opts.Conf)
if err != nil {
log.Fatal("Error reading configuratio file:", opts.Conf)
}
// Log stuff
println("Log...")
name := appname
pid := os.Getpid()
pidstr := strconv.FormatInt(int64(pid), 10)
name = name + " (" + pidstr + ")"
fnull, err := os.OpenFile("/dev/null", os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0660)
if err != nil {
log.Fatal("open log file failed:", err)
}
defer fnull.Close()
stderrBack := log.NewWriter(fnull).F(log.DefFormatter)
if opts.Level != "" && opts.Level != "nolog" {
level, err := log.ParseLevel(opts.Level)
if err != nil {
log.Fatal("Invalid log level.")
}
stderrBack = log.Filter(
log.NewWriter(os.Stderr).F(log.DefFormatter),
log.Op(log.Ge, "level", level),
)
}
logfile := cfg.Section("log").Key("file").MustString("/var/log/monlite.log")
if opts.Log != "" {
logfile = opts.Log
}
loglevel := cfg.Section("log").Key("level").MustString("debug")
level, err := log.ParseLevel(loglevel)
if err != nil {
log.Fatal("Invalid log level.")
}
var fileBack log.LogBackend
if logfile != "" {
f, err := os.OpenFile(logfile, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0660)
if err != nil {
log.Fatalf("open log file %v failed: %v", logfile, err)
}
defer f.Close()
fileBack = log.Filter(
log.NewWriter(f).F(log.DefFormatter),
log.Op(log.Ge, "level", level),
)
}
log.Log = log.New(stderrBack, true).Domain(name).InfoLevel()
if fileBack != nil {
log.Log = log.New(
log.NewMulti(
stderrBack,
log.DefFormatter,
fileBack,
log.DefFormatter,
),
true,
).Domain(name).InfoLevel()
}
log.Println("Log Ok!")
dns.SetLookupHostFunction(net.LookupHost)
log.Println("Configuration...")
cfgMail := cfg.Section("mail")
smtpTimeout, err := cfgMail.Key("timeout").Int()
if err != nil {
log.Fatal("invalid smtp timeout")
}
server := cfgMail.Key("smtp").String()
s := strings.Split(server, ":")
if len(s) > 0 {
server = s[0]
}
auth := smtp.PlainAuth(
"",
cfgMail.Key("account").String(),
cfgMail.Key("password").String(),
server,
)
hostname := "your system"
if hn, err := os.Hostname(); err == nil {
hostname = hn
}
mons := make([]*monlite.Monitor, 0)
for _, sec := range cfg.Sections() {
if !strings.HasPrefix(sec.Name(), "service.") {
continue
}
name := strings.TrimPrefix(sec.Name(), "service.")
log.DebugLevel().Printf("Adding monitor %v for url: %v", name, sec.Key("url").String())
to, err := sec.Key("timeout").Int()
if err != nil {
log.Fatalf("invalid value in timeout for %v", name)
}
p, err := sec.Key("periode").Int()
if err != nil {
log.Fatalf("invalid value in timeout for %v", name)
}
sleep, err := sec.Key("sleep").Int()
if err != nil {
log.Fatalf("invalid value in sleep for %v", name)
}
fails, err := sec.Key("fails").Int()
if err != nil {
log.Fatalf("invalid value in fails for %v", name)
}
mons = append(mons, &monlite.Monitor{
Name: name,
Url: sec.Key("url").String(),
Timeout: time.Duration(to) * time.Second,
Periode: time.Duration(p) * time.Second,
Sleep: time.Duration(sleep) * time.Second,
Fails: fails,
OnFail: func(m *monlite.Monitor) error {
body := "Mime-Version: 1.0\n"
body += "Content-Type: text/plain; charset=utf-8\n"
body += "From:" + cfgMail.Key("from").String() + "\n"
body += "To:" + cfgMail.Key("to").String() + "\n"
body += "Subject: [" + hostname + "] " + "Monitor fail for " + m.Name + "\n"
body += "Hi! This is " + hostname + ".\n\n"
body += "Monitor fail for " + m.Name + " " + m.Url + "\n\n"
body += "Tank you, our lazy boy.\n"
body += time.Now().Format(time.RFC1123Z)
err := mysmtp.SendMail(
cfgMail.Key("smtp").String(),
auth,
cfgMail.Key("from").String(),
[]string{cfgMail.Key("to").String()},
cfgMail.Key("helo").String(),
[]byte(body),
time.Duration(smtpTimeout)*time.Second,
false,
)
if err != nil {
return e.Forward(err)
}
return nil
},
OnUnFail: func(m *monlite.Monitor) error {
body := "Mime-Version: 1.0\n"
body += "Content-Type: text/plain; charset=utf-8\n"
body += "From:" + cfgMail.Key("from").String() + "\n"
body += "To:" + cfgMail.Key("to").String() + "\n"
body += "Subject: [" + hostname + "] " + "Monitor ok for " + m.Name + "\n"
body += "Hi! This is " + hostname + ".\n\n"
body += "Monitor ok for " + m.Name + " " + m.Url + "\n\n"
body += "Tank you, our lazy boy.\n"
body += time.Now().Format(time.RFC1123Z)
err := mysmtp.SendMail(
cfgMail.Key("smtp").String(),
auth,
cfgMail.Key("from").String(),
[]string{cfgMail.Key("to").String()},
cfgMail.Key("helo").String(),
[]byte(body),
time.Duration(smtpTimeout)*time.Second,
false,
)
if err != nil {
return e.Forward(err)
}
return nil
},
})
}
log.Println("Starting monitors...")
for _, m := range mons {
err := m.Start()
if err != nil {
log.Fatalf("Failed to start monitor for %v. Error: %v", m.Name, err)
}
}
log.Println("Monitors ok!")
sig := make(chan os.Signal)
signal.Notify(sig, syscall.SIGINT, syscall.SIGKILL, syscall.SIGTERM)
<-sig
log.Println("Stop monitors...")
for _, m := range mons {
log.DebugLevel().Printf("Stop monitor %v", m.Name)
err := m.Stop()
if err != nil {
log.Errorf("Failed to start monitor for %v. Error: %v", m.Name, err)
}
}
log.Println("End.")
}