func main() {
log.AddFilter("stderr", l4g.DEBUG,
l4g.NewFormatLogWriter(os.Stderr, "[%d %t] [%L] %M"))
defer log.Close()
ParseArgs()
// var rootDb *mymysql.MySQL
// var leafDb *mymysql.MySQL
// verify database connectability
// if *rootHost != "" {
// rootAddr := fmt.Sprintf("%v:%v", *rootHost, *rootPort)
// rootDb = mymysql.New("tcp", "", rootAddr, *rootUser, *rootPass)
// rootDb.Register("set names utf8")
// rows, _, err := rootDb.QueryAC("SELECT * FROM mysql.user")
// if err != nil {
// log.Error(err)
// return
// }
// // defer log.Info(rootDb)
// // defer rootDb.Close()
// // defer log.Info(rootDb)
// log.Info(len(rows))
// for i, _ := range rows {
// log.Info("%v\n", i)
// }
// log.Close()
// }
}
func main() {
// parse command line flags
parseFlags()
// init logger
log.AddFilter(*logFilename, logLevel,
l4g.NewFormatLogWriter(logFile, "[%d %t] [%L] %M"))
defer log.Close()
sqlog.AddFilter(*sqlogFilename, sqlogLevel,
l4g.NewFormatLogWriter(sqlogFile, "[%d %t] %M"))
defer sqlog.Close()
// global error catching
defer func() {
exit(recover())
}()
createPidfile()
// spawn os signal handler
go func() {
for {
switch sig := (<-signal.Incoming).(os.UnixSignal); sig {
case os.SIGINT, os.SIGHUP, os.SIGQUIT, os.SIGTERM, os.SIGKILL:
{
exit(fmt.Sprintf("%v received", sig))
}
}
}
}()
// query slave status from MySQL instance
db := mysql.New("tcp", "",
server.Host+":"+strconv.Itoa(server.Port), server.User, server.Pass)
defer db.Close()
db.Debug = false
log.Info("starting %v...", cmdname)
if *batchMode {
err := db.Connect()
if err != nil {
panic(fmt.Sprintf("can't connect to %v on port %v: %v",
server.Host, server.Port, err))
}
processRplStatus(db)
} else {
for {
if !db.IsConnected() {
log.Info("connecting to %v port %v", server.Host, server.Port)
err := db.Connect()
if err != nil {
log.Warn("can't connect to %v on port %v: %v",
server.Host, server.Port, err)
log.Warn("retry in %v seconds...", *retryInterval)
// sleep for timeInterval minute(s)
time.Sleep(int64(*retryInterval) * 1e9)
continue
}
log.Info("connection established. start monitoring.")
}
slave, reconnect := processRplStatus(db)
if !slave {
// target server is not eligible to be monitored
break
}
if reconnect {
log.Warn("retry in %v seconds...", *retryInterval)
db.Close()
time.Sleep(int64(*retryInterval) * 1e9)
} else {
time.Sleep(int64(*interval) * 1e9)
}
}
}
exit(nil)
}