/
engine.go
355 lines (279 loc) · 7.91 KB
/
engine.go
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package engine
import (
"errors"
"fmt"
"os"
"os/signal"
"runtime/debug"
"syscall"
"github.com/TIBCOSoftware/flogo-lib/app"
"github.com/TIBCOSoftware/flogo-lib/config"
"github.com/TIBCOSoftware/flogo-lib/core/action"
"github.com/TIBCOSoftware/flogo-lib/core/data"
"github.com/TIBCOSoftware/flogo-lib/core/trigger"
"github.com/TIBCOSoftware/flogo-lib/engine/runner"
"github.com/TIBCOSoftware/flogo-lib/logger"
"github.com/TIBCOSoftware/flogo-lib/util"
"github.com/TIBCOSoftware/flogo-lib/util/managed"
"sync"
"github.com/TIBCOSoftware/flogo-lib/engine/channels"
)
var managedServices []managed.Managed
var lock = &sync.Mutex{}
// Interface for the engine behaviour
type Engine interface {
// Init initialize the engine
Init(directRunner bool) error
// Start starts the engine
Start() error
// Stop stop the engine
Stop() error
// TriggerInfos get info for the triggers
TriggerInfos() []*managed.Info
}
func LifeCycle(managedEntity managed.Managed) {
defer lock.Unlock()
lock.Lock()
managedServices = append(managedServices, managedEntity)
}
// engineImpl is the type for the Default Engine Implementation
type engineImpl struct {
app *app.Config
initialized bool
logLevel string
actionRunner action.Runner
serviceManager *util.ServiceManager
triggers map[string]trigger.Trigger
triggerInfos map[string]*managed.Info
}
// New creates a new Engine
func New(appCfg *app.Config) (Engine, error) {
// App is required
if appCfg == nil {
return nil, errors.New("no App configuration provided")
}
// Name is required
if len(appCfg.Name) == 0 {
return nil, errors.New("no App name provided")
}
// Version is required
if len(appCfg.Version) == 0 {
return nil, errors.New("no App version provided")
}
//fix up app configuration if it is older
//app.FixUpApp(appCfg)
logLevel := config.GetLogLevel()
return &engineImpl{app: appCfg, serviceManager: util.GetDefaultServiceManager(), logLevel: logLevel}, nil
}
func (e *engineImpl) Init(directRunner bool) error {
if !e.initialized {
e.initialized = true
if directRunner {
e.actionRunner = runner.NewDirect()
} else {
e.actionRunner = runner.NewPooled(NewPooledRunnerConfig())
}
propProvider := app.GetPropertyProvider()
// Initialize the properties
props, err := app.GetProperties(e.app.Properties)
if err != nil {
return err
}
propProvider.SetProperties(props)
data.SetPropertyProvider(propProvider)
actionFactories := action.Factories()
for _, factory := range actionFactories {
if initializable, ok := factory.(managed.Initializable); ok {
if err := initializable.Init(); err != nil {
return err
}
}
}
//add engine channels
channelDescriptors := e.app.Channels
if len(channelDescriptors) > 0 {
for _, descriptor := range channelDescriptors {
name, buffSize := channels.Decode(descriptor)
logger.Debugf("Creating Engine Channel '%s'", name)
channels.New(name, buffSize)
}
}
err = app.RegisterResources(e.app.Resources)
if err != nil {
return err
}
actions, err := app.CreateSharedActions(e.app.Actions)
if err != nil {
errorMsg := fmt.Sprintf("Error creating shared action instances - %s", err.Error())
logger.Error(errorMsg)
panic(errorMsg)
}
//todo add all actions to engine (will make cleanup easier)
triggers, err := app.CreateTriggers(e.app.Triggers, actions, e.actionRunner)
e.triggerInfos = make(map[string]*managed.Info)
if err != nil {
errorMsg := fmt.Sprintf("Error Creating trigger instances - %s", err.Error())
logger.Error(errorMsg)
panic(errorMsg)
}
e.triggers = triggers
}
return nil
}
//Start initializes and starts the Triggers and initializes the Actions
func (e *engineImpl) Start() error {
logger.SetDefaultLogger("engine")
logger.Infof("Starting app [ %s ] with version [ %s ]", e.app.Name, e.app.Version)
logger.Info("Engine Starting...")
// Todo document RunnerType for engine configuration
runnerType := GetRunnerType()
err := e.Init(runnerType == "DIRECT")
if err != nil {
return err
}
logger.Info("Starting Services...")
actionRunner := e.actionRunner.(interface{})
if managedRunner, ok := actionRunner.(managed.Managed); ok {
managed.Start("ActionRunner Service", managedRunner)
}
err = e.serviceManager.Start()
if err != nil {
logger.Error("Error Starting Services - " + err.Error())
} else {
logger.Info("Started Services")
}
if len(managedServices) > 0 {
for _, mService := range managedServices {
err = mService.Start()
if err != nil {
logger.Error("Error Starting Services - " + err.Error())
//TODO Should we exit here?
}
}
}
// Start the triggers
logger.Info("Starting Triggers...")
var failed []string
for key, value := range e.triggers {
triggerInfo := &managed.Info{Name: key}
err := managed.Start(fmt.Sprintf("Trigger [ %s ]", key), value)
if err != nil {
logger.Infof("Trigger [%s] failed to start due to error [%s]", key, err.Error())
triggerInfo.Status = managed.StatusFailed
triggerInfo.Error = err
logger.Debugf("StackTrace: %s", debug.Stack())
if config.StopEngineOnError() {
logger.Debugf("{%s=true}. Stopping engine", config.ENV_STOP_ENGINE_ON_ERROR_KEY)
logger.Info("Stopped")
os.Exit(1)
}
failed = append(failed, key)
} else {
triggerInfo.Status = managed.StatusStarted
logger.Infof("Trigger [ %s ]: Started", key)
logger.Debugf("Trigger [ %s ] has ref [ %s ] and version [ %s ]", key, value.Metadata().ID, value.Metadata().Version)
}
e.triggerInfos[key] = triggerInfo
}
if len(failed) > 0 {
//remove failed trigger, we have no use for them
for _, triggerId := range failed {
delete(e.triggers, triggerId)
}
}
logger.Info("Triggers Started")
if channels.Count() > 0 {
logger.Info("Starting Engine Channels...")
channels.Start()
logger.Info("Engine Channels Started")
}
logger.Info("Engine Started")
return nil
}
func (e *engineImpl) Stop() error {
logger.Info("Engine Stopping...")
if channels.Count() > 0 {
logger.Info("Stopping Engine Channels...")
channels.Stop()
logger.Info("Engine Channels Stopped...")
}
logger.Info("Stopping Triggers...")
// Stop Triggers
for trgId, tgr := range e.triggers {
managed.Stop("Trigger [ "+trgId+" ]", tgr)
e.triggerInfos[trgId].Status = managed.StatusStopped
}
logger.Info("Triggers Stopped")
//TODO temporarily add services
logger.Info("Stopping Services...")
actionRunner := e.actionRunner.(interface{})
if managedRunner, ok := actionRunner.(managed.Managed); ok {
managed.Stop("ActionRunner", managedRunner)
}
err := e.serviceManager.Stop()
if err != nil {
logger.Error("Error Stopping Services - " + err.Error())
} else {
logger.Info("Stopped Services")
}
if len(managedServices) > 0 {
for _, mService := range managedServices {
err = mService.Stop()
if err != nil {
logger.Error("Error Stopping Services - " + err.Error())
}
}
}
logger.Info("Engine Stopped")
return nil
}
func (e *engineImpl) TriggerInfos() []*managed.Info {
infos := make([]*managed.Info, 0, len(e.triggerInfos))
for _, info := range e.triggerInfos {
infos = append(infos, info)
}
return infos
}
func RunEngine(e Engine) {
err := e.Start()
if err != nil {
fmt.Println("Error starting engine", err.Error())
os.Exit(1)
}
exitChan := setupSignalHandling()
code := <-exitChan
e.Stop()
os.Exit(code)
}
func setupSignalHandling() chan int {
signalChan := make(chan os.Signal, 1)
signal.Notify(signalChan,
syscall.SIGHUP,
syscall.SIGINT,
syscall.SIGTERM,
syscall.SIGQUIT)
exitChan := make(chan int)
go func() {
for {
s := <-signalChan
switch s {
// kill -SIGHUP
case syscall.SIGHUP:
exitChan <- 0
// kill -SIGINT/Ctrl+c
case syscall.SIGINT:
exitChan <- 0
// kill -SIGTERM
case syscall.SIGTERM:
exitChan <- 0
// kill -SIGQUIT
case syscall.SIGQUIT:
exitChan <- 0
default:
logger.Debug("Unknown signal.")
exitChan <- 1
}
}
}()
return exitChan
}