//func composeEventHub(cfg *config.Config, serfAgent *agent.Agent) (*EventHub, error) {
func composeEventHub(cfg *config.Config, serfAgent *agent.Agent) (agent.EventHandler, error) {
log.Info("composing new sentinel %#v", cfg)
log.Info("setting up sentinel adapter: %s", cfg.Adapter.Plugin)
adapterCreator, ok := adapters.Plugins[cfg.Adapter.Plugin]
if !ok {
return nil, fmt.Errorf("invalid adapter: %s", cfg.Adapter.Plugin)
}
adapter_, err := adapterCreator(cfg.Adapter.Opts)
if err != nil {
return nil, err
}
// setting up common actuator
log.Info("setting up sentinel actuator: %s", cfg.Actuator.Plugin)
actuatorCreator, ok := actuators.Plugins[cfg.Actuator.Plugin]
if !ok {
return nil, fmt.Errorf("invalid actuator: %s", cfg.Actuator.Plugin)
}
actuator_, err := actuatorCreator(adapter_, cfg.Actuator.Opts)
if err != nil {
return nil, err
}
return EventHub{
Actuator: actuator_,
Self: serfAgent.Serf().LocalMember(),
Filters: cfg.Heartbeat.Filters,
}, nil
}
// TODO remove serfConif
func onAgentReady(serfAgent *agent.Agent, serfConfig *agent.Config, shutdownCh <-chan struct{}) {
// search for the path in environment, fallback to default
cfgPath, err := config.Path()
if err != nil {
log.Error("error searching configuration file: %v", err)
return
}
cfg, err := config.Load(cfgPath)
if err != nil {
log.Error("failed to load configuration: %v", err)
return
}
hub, err := composeEventHub(cfg, serfAgent)
if err != nil {
log.Error("failed to compose sentinel event hub: %s", err)
return
}
if cfg.Heartbeat.Plugin == "event" {
log.Info("registering new event handler")
serfAgent.RegisterEventHandler(hub)
} else {
// setting up heartbeat
heartbeatCreator, ok := heartbeats.Plugins[cfg.Heartbeat.Plugin]
if !ok {
log.Error("invalid heartbeat: %s", cfg.Heartbeat.Plugin)
return
}
heartbeat_, err := heartbeatCreator(cfg.Heartbeat.Opts)
if err != nil {
log.Error("failed to initialize heartbeat: %s", err)
return
}
defer heartbeat_.Stop()
log.Info("scheduling new sentinel actuator")
heartbeat_.Schedule(cfg.Name, hub)
}
handleSignals(serfAgent, shutdownCh)
return
}
func handleSignals(serfAgent *agent.Agent, shutdownCh <-chan struct{}) {
signalCh := make(chan os.Signal, 4)
signal.Notify(signalCh, os.Interrupt, syscall.SIGTERM, syscall.SIGHUP)
// Wait for signal
// FIXME serf shutdowns too damn fast !
WAIT:
select {
case sig := <-signalCh:
log.Info("caught signal: %v\n", sig)
if sig == syscall.SIGHUP {
// serf catches this signal to reload its configuration
// NOTE reload sentinel conf ?
goto WAIT
} else {
return
}
case <-shutdownCh:
return
case <-serfAgent.ShutdownCh():
// Agent is already shutdown!
return
}
}