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caretakerd.go
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caretakerd.go
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package caretakerd
import (
"github.com/echocat/caretakerd/control"
"github.com/echocat/caretakerd/errors"
"github.com/echocat/caretakerd/keyStore"
"github.com/echocat/caretakerd/logger"
"github.com/echocat/caretakerd/panics"
"github.com/echocat/caretakerd/rpc"
"github.com/echocat/caretakerd/service"
usync "github.com/echocat/caretakerd/sync"
"github.com/echocat/caretakerd/values"
"os"
osignal "os/signal"
"runtime"
"sync"
"syscall"
)
// Caretakerd instance structure
type Caretakerd struct {
config Config
logger *logger.Logger
control *control.Control
services *service.Services
lock *sync.Mutex
syncGroup *usync.Group
execution *Execution
signalChannel chan os.Signal
open bool
keyStore *keyStore.KeyStore
}
func finalize(what *Caretakerd) {
what.Close()
}
// NewCaretakerd create a new Caretakerd instance from given config
func NewCaretakerd(conf Config, syncGroup *usync.Group) (*Caretakerd, error) {
err := conf.Validate()
if err != nil {
return nil, err
}
log, err := logger.NewLogger(conf.Logger, "caretakerd", syncGroup)
if err != nil {
return nil, errors.New("Could not create logger for caretakerd.").CausedBy(err)
}
ks, err := keyStore.NewKeyStore(bool(conf.RPC.Enabled), conf.KeyStore)
if err != nil {
return nil, err
}
ctl, err := control.NewControl(conf.Control, ks)
if err != nil {
return nil, err
}
services, err := service.NewServices(conf.Services, syncGroup, ks)
if err != nil {
return nil, err
}
result := Caretakerd{
open: true,
config: conf,
logger: log,
control: ctl,
keyStore: ks,
services: services,
lock: new(sync.Mutex),
syncGroup: syncGroup,
signalChannel: nil,
}
runtime.SetFinalizer(&result, finalize)
return &result, nil
}
// IsOpen return true if caretakerd is still open. This should be false after Close() was called.
func (instance Caretakerd) IsOpen() bool {
return instance.open
}
// Close close the caretakerd instance and free resoruces.
// After call of this method it is not longer possible to use this instance.
func (instance *Caretakerd) Close() {
defer func() {
instance.open = false
}()
instance.Stop()
instance.services.Close()
instance.logger.Close()
}
// Logger return instantiated logger that belongs to this instance.
func (instance Caretakerd) Logger() *logger.Logger {
return instance.logger
}
// Control return instantiated control that belongs to this instance.
func (instance *Caretakerd) Control() *control.Control {
return instance.control
}
// Services return instantiated services that belongs to this instance.
func (instance *Caretakerd) Services() *service.Services {
return instance.services
}
// KeyStore return instantiated keyStore that belongs to this instance.
func (instance *Caretakerd) KeyStore() *keyStore.KeyStore {
return instance.keyStore
}
// ConfigObject return config this instances was created with.
func (instance *Caretakerd) ConfigObject() interface{} {
return instance.config
}
// Run starts every services and requird resources of caretakerd.
// This method is blocking.
func (instance *Caretakerd) Run() (values.ExitCode, error) {
var r *rpc.RPC
defer func() {
instance.uninstallTerminationNotificationHandler()
if r != nil {
r.Stop()
}
}()
execution := NewExecution(instance)
if instance.config.RPC.Enabled == values.Boolean(true) {
r = rpc.NewRPC(instance.config.RPC, execution, instance, instance.logger)
r.Start()
}
instance.installTerminationNotificationHandler()
instance.execution = execution
return execution.Run()
}
// Stop stops this instance (if running).
// This method is blocking until every service and resource is stopped.
func (instance *Caretakerd) Stop() {
defer func() {
instance.execution = nil
}()
execution := instance.execution
if execution != nil {
execution.StopAll()
}
instance.syncGroup.Interrupt()
}
func (instance *Caretakerd) installTerminationNotificationHandler() {
instance.lock.Lock()
defer func() {
instance.lock.Unlock()
}()
if instance.signalChannel == nil {
instance.signalChannel = make(chan os.Signal, 1)
osignal.Notify(instance.signalChannel, syscall.SIGINT, syscall.SIGTERM)
go instance.terminationNotificationHandler()
}
}
func (instance *Caretakerd) terminationNotificationHandler() {
defer panics.DefaultPanicHandler()
for {
osSignal, channelReady := <-instance.signalChannel
if channelReady {
signal := values.Signal(osSignal.(syscall.Signal))
instance.Logger().Log(logger.Debug, "Received shudown signal: %v", signal)
instance.Stop()
} else {
break
}
}
}
func (instance *Caretakerd) uninstallTerminationNotificationHandler() {
instance.lock.Lock()
defer func() {
instance.signalChannel = nil
instance.lock.Unlock()
}()
if instance.signalChannel != nil {
osignal.Stop(instance.signalChannel)
}
}