func initCmd(subFlags *flag.FlagSet, args []string) error {
waitTime := subFlags.Duration("wait_time", 5*time.Minute, "how long to wait for startup")
initDBSQLFile := subFlags.String("init_db_sql_file", "", "path to .sql file to run after mysql_install_db")
subFlags.Parse(args)
// Generate my.cnf from scratch and use it to find mysqld.
mysqld, err := mysqlctl.CreateMysqld(uint32(*tabletUID), *mysqlSocket, int32(*mysqlPort), dbconfigFlags)
if err != nil {
return fmt.Errorf("failed to initialize mysql config: %v", err)
}
defer mysqld.Close()
ctx, cancel := context.WithTimeout(context.Background(), *waitTime)
defer cancel()
if err := mysqld.Init(ctx, *initDBSQLFile); err != nil {
return fmt.Errorf("failed init mysql: %v", err)
}
return nil
}
func main() {
defer exit.Recover()
defer logutil.Flush()
dbconfigFlags := dbconfigs.AppConfig | dbconfigs.DbaConfig |
dbconfigs.FilteredConfig | dbconfigs.ReplConfig
dbconfigs.RegisterFlags(dbconfigFlags)
flag.Parse()
// We'll register this OnTerm handler before mysqld starts, so we get notified
// if mysqld dies on its own without us (or our RPC client) telling it to.
mysqldTerminated := make(chan struct{})
onTermFunc := func() {
close(mysqldTerminated)
}
// Start or Init mysqld as needed.
ctx, cancel := context.WithTimeout(context.Background(), *waitTime)
tabletDir := mysqlctl.TabletDir(uint32(*tabletUID))
if _, statErr := os.Stat(tabletDir); os.IsNotExist(statErr) {
// Generate my.cnf from scratch and use it to find mysqld.
log.Infof("tablet dir (%s) doesn't exist, initializing", tabletDir)
var err error
mysqld, err = mysqlctl.CreateMysqld(uint32(*tabletUID), *mysqlSocket, int32(*mysqlPort), dbconfigFlags)
if err != nil {
log.Errorf("failed to initialize mysql config: %v", err)
exit.Return(1)
}
mysqld.OnTerm(onTermFunc)
if err := mysqld.Init(ctx, *initDBSQLFile); err != nil {
log.Errorf("failed to initialize mysql data dir and start mysqld: %v", err)
exit.Return(1)
}
} else {
// There ought to be an existing my.cnf, so use it to find mysqld.
log.Infof("tablet dir (%s) already exists, starting without init", tabletDir)
var err error
mysqld, err = mysqlctl.OpenMysqld(uint32(*tabletUID), dbconfigFlags)
if err != nil {
log.Errorf("failed to find mysql config: %v", err)
exit.Return(1)
}
mysqld.OnTerm(onTermFunc)
if err := mysqld.Start(ctx); err != nil {
log.Errorf("failed to start mysqld: %v", err)
exit.Return(1)
}
}
cancel()
servenv.Init()
defer servenv.Close()
// Take mysqld down with us on SIGTERM before entering lame duck.
servenv.OnTerm(func() {
log.Infof("mysqlctl received SIGTERM, shutting down mysqld first")
ctx := context.Background()
mysqld.Shutdown(ctx, false)
})
// Start RPC server and wait for SIGTERM.
mysqlctldTerminated := make(chan struct{})
go func() {
servenv.RunDefault()
close(mysqlctldTerminated)
}()
select {
case <-mysqldTerminated:
log.Infof("mysqld shut down on its own, exiting mysqlctld")
case <-mysqlctldTerminated:
log.Infof("mysqlctld shut down gracefully")
}
}