func start(me, other *mock_state.MockState, test *testing.T) *performer {
// i need to create a tmp folder
// start a action
// then have it transition to different states.
// overwrite the builtin config options
config.Conf = config.Config{
PGPort: 4567,
DataDir: os.TempDir() + "/postgres/",
StatusDir: os.TempDir() + "/postgres/",
SyncCommand: "true",
SystemUser: config.SystemUser(),
}
perform := NewPerformer(me, other, config.Conf)
// ignore all errors that come across this way
go func() {
<-perform.err
}()
err := perform.Initialize()
if err != nil {
test.Log(err)
test.FailNow()
}
if err := config.ConfigureHBAConf("127.0.0.1"); err != nil {
test.Log(err)
test.FailNow()
}
if err := config.ConfigurePGConf("127.0.0.1", config.Conf.PGPort); err != nil {
test.Log(err)
test.FailNow()
}
err = perform.Start()
if err != nil {
test.Log(err)
test.FailNow()
}
return perform
}
func main() {
if len(os.Args) != 2 {
fmt.Println("Missing required config file!")
fmt.Println("Please, run yoke with configuration file as argument (e.g. $ yoke /etc/yoke/yoke.ini)")
os.Exit(1)
}
config.Init(os.Args[1])
config.ConfigurePGConf("0.0.0.0", config.Conf.PGPort)
store, err := scribble.New(config.Conf.StatusDir, config.Log)
if err != nil {
config.Log.Fatal("Scribble did not setup correctly: %v", err)
os.Exit(1)
}
location := fmt.Sprintf("%v:%d", config.Conf.AdvertiseIp, config.Conf.AdvertisePort)
me, err := state.NewLocalState(config.Conf.Role, location, config.Conf.DataDir, store)
if err != nil {
config.Log.Fatal("Failed to set local state: %v", err)
os.Exit(1)
}
me.ExposeRPCEndpoint("tcp", location)
var other state.State
var host string
switch config.Conf.Role {
case "primary":
location := config.Conf.Secondary
other = state.NewRemoteState("tcp", location, time.Second)
host, _, err = net.SplitHostPort(location)
if err != nil {
config.Log.Fatal("Failed to split host:port for primary node: %v", err)
os.Exit(1)
}
case "secondary":
location := config.Conf.Primary
other = state.NewRemoteState("tcp", location, time.Second)
host, _, err = net.SplitHostPort(location)
if err != nil {
config.Log.Fatal("Failed to split host:port for secondary node: %v", err)
os.Exit(1)
}
default:
// nothing as the monitor does not need to monitor anything
// the monitor just acts as a secondary mode of communication in network
// splits
}
mon := state.NewRemoteState("tcp", config.Conf.Monitor, time.Second)
var perform monitor.Performer
finished := make(chan error)
if other != nil {
perform = monitor.NewPerformer(me, other, config.Conf)
if err := perform.Initialize(); err != nil {
config.Log.Fatal("Failed to initialize database: %v", err)
os.Exit(1)
}
if err := config.ConfigureHBAConf(host); err != nil {
config.Log.Fatal("Failed to configure pg_hba.conf file: %v", err)
os.Exit(1)
}
if err := config.ConfigurePGConf("0.0.0.0", config.Conf.PGPort); err != nil {
config.Log.Fatal("Failed to configure postgresql.conf file: %v", err)
os.Exit(1)
}
if err := perform.Start(); err != nil {
config.Log.Fatal("Failed to start postgres: %v", err)
os.Exit(1)
}
go func() {
decide := monitor.NewDecider(me, other, mon, perform)
decide.Loop(time.Second * 2)
}()
go func() {
err := perform.Loop()
if err != nil {
finished <- err
}
// how do I stop the decide loop?
close(finished)
}()
}
// signal Handle
signals := make(chan os.Signal, 1)
signal.Notify(signals, syscall.SIGINT, syscall.SIGTERM, os.Kill, syscall.SIGQUIT, syscall.SIGALRM)
// Block until a signal is received.
for {
select {
case err := <-finished:
if err != nil {
config.Log.Fatal("The performer is finished, something triggered a stop: %v", err)
os.Exit(1)
}
config.Log.Info("the database was shut down")
return
case signal := <-signals:
switch signal {
case syscall.SIGINT, os.Kill, syscall.SIGQUIT, syscall.SIGTERM:
config.Log.Info("shutting down")
if perform != nil {
// stop the database, then wait for it to be stopped
config.Log.Info("shutting down the database")
perform.Stop()
perform = nil
config.Log.Info("waiting for the database")
} else {
return
}
case syscall.SIGALRM:
config.Log.Info("Printing Stack Trace")
stacktrace := make([]byte, 8192)
length := runtime.Stack(stacktrace, true)
fmt.Println(string(stacktrace[:length]))
}
}
}
}
