func main() {
mlvl := metafora.LogLevelInfo
hostname, _ := os.Hostname()
peers := flag.String("etcd", "http://127.0.0.1:2379", "comma delimited etcd peer list")
namespace := flag.String("namespace", "koalemos", "metafora namespace")
name := flag.String("name", hostname, "node name or empty for automatic")
loglvl := flag.String("log", mlvl.String(), "set log level: [debug], info, warn, error")
flag.Parse()
hosts := strings.Split(*peers, ",")
etcdc := etcd.NewClient(hosts)
switch strings.ToLower(*loglvl) {
case "debug":
mlvl = metafora.LogLevelDebug
case "info":
mlvl = metafora.LogLevelInfo
case "warn":
mlvl = metafora.LogLevelWarn
case "error":
mlvl = metafora.LogLevelError
default:
metafora.Warnf("Invalid log level %q - using %s", *loglvl, mlvl)
}
metafora.SetLogLevel(mlvl)
conf := m_etcd.NewConfig(*name, *namespace, hosts)
// Replace NewTask func with one that returns a *koalemos.Task
conf.NewTaskFunc = func(id, value string) metafora.Task {
t := koalemos.NewTask(id)
if value == "" {
return t
}
if err := json.Unmarshal([]byte(value), t); err != nil {
metafora.Errorf("Unable to unmarshal task %s: %v", t.ID(), err)
return nil
}
return t
}
hfunc := makeHandlerFunc(etcdc)
ec, err := m_etcd.NewEtcdCoordinator(conf)
if err != nil {
metafora.Errorf("Error creating etcd coordinator: %v", err)
}
bal := m_etcd.NewFairBalancer(conf)
c, err := metafora.NewConsumer(ec, hfunc, bal)
if err != nil {
metafora.Errorf("Error creating consumer: %v", err)
os.Exit(2)
}
metafora.Infof(
"Starting koalsmosd with etcd=%s; namespace=%s; name=%s; loglvl=%s",
*peers, conf.Namespace, conf.Name, mlvl)
consumerRunning := make(chan struct{})
go func() {
defer close(consumerRunning)
c.Run()
}()
sigC := make(chan os.Signal, 1)
signal.Notify(sigC, os.Interrupt, os.Kill, syscall.SIGTERM)
select {
case s := <-sigC:
metafora.Infof("Received signal %s, shutting down", s)
case <-consumerRunning:
metafora.Warn("Consumer exited. Shutting down.")
}
c.Shutdown()
metafora.Info("Shutdown")
}
// Start the grid. Actors that were stopped from a previous exit
// of the grid but returned a "done" status of false will start
// to be scheduled. New actors can be scheduled with StartActor.
func (g *grid) Start() (<-chan bool, error) {
g.mu.Lock()
defer g.mu.Unlock()
// Start only once.
if g.started {
return g.exit, nil
}
// Use the hostname as the node identifier.
hostname, err := os.Hostname()
if err != nil {
return nil, err
}
nodeid := fmt.Sprintf("%s-%s", hostname, g.name)
// Define the metafora new task function and config.
conf := m_etcd.NewConfig(nodeid, g.name, g.etcdservers)
conf.NewTaskFunc = func(id, value string) metafora.Task {
def := NewActorDef(id)
err := json.Unmarshal([]byte(value), def)
if err != nil {
log.Printf("error: failed to schedule actor: %v, error: %v", id, err)
return nil
}
a, err := g.maker.MakeActor(def)
if err != nil {
log.Printf("error: failed to schedule actor: %v, error: %v", id, err)
return nil
}
return newHandler(g.fork(), a)
}
// Create the metafora etcd coordinator.
ec, err := m_etcd.NewEtcdCoordinator(conf)
if err != nil {
return nil, err
}
// Create the metafora consumer.
c, err := metafora.NewConsumer(ec, handler(etcd.NewClient(g.etcdservers)), m_etcd.NewFairBalancer(conf))
if err != nil {
return nil, err
}
g.metaconsumer = c
g.metaclient = m_etcd.NewClient(g.name, g.etcdservers)
g.stopped = false
g.started = true
// Close the exit channel when metafora thinks
// an exit is needed.
go func() {
defer close(g.exit)
g.metaconsumer.Run()
}()
for i := 0; i < 2*runtime.NumCPU(); i++ {
natsconn, err := g.newNatsConn()
if err != nil {
return nil, err
}
g.natsconnpool[i] = natsconn
if i == 0 {
g.natsconn = g.natsconnpool[0]
}
}
return g.exit, nil
}