event_sender_go/event_sender.go

package event_sender_go

import (
	"context"
	"google.golang.org/grpc"
	//"loafle.com/overflow/agent_api/observer/messages"
	pb "loafle.com/overflow/crawler_go/grpc"
	q "loafle.com/overflow/queue_go"
	"log"
	"reflect"
	"sync"
)

var (
	instance *EventSender
	once     sync.Once
)

const (
	CENTRAL_ADDR     = "192.168.1.105:50052"
	SENDER_ID        = "OVERFLOW_EVENT_SENDER"
	DEFAULT_INTERVAL = 1
)

type Data struct {
	AgentId    string
	SensorId   string
	Data       map[string]string
	StartedAt  uint64
	FinishedAt uint64
}

func GetInstance() *EventSender {
	once.Do(func() {
		instance = &EventSender{}
	})
	return instance
}

//func init() {
//	ch := make(chan interface{}, 0)
//	ch1 := make(chan interface{}, 0)
//	observer.Add(messages.CFG_LOADED, ch)
//	observer.Add(messages.SCF_STOPPED, ch1)
//	handleInit(ch, ch1)
//}
//
//func handleInit(ch chan interface{}, ch1 chan interface{}) {
//	es := GetInstance()
//	go func() {
//		data := <-ch
//		log.Println("handleInit", data)
//		//ds.gconf = data.(cm.ConfigManager).GetGlobalConfig()
//		es.start()
//		observer.Remove(messages.CFG_LOADED, ch)
//	}()
//
//	go func() {
//		data := <-ch1
//		observer.Notify(messages.QUEUE_EVENT, data)
//		time.Sleep(2 * time.Second)
//		es.Stop()
//	}()
//}


func Start(ch chan bool) (err error) {
	es := GetInstance()

	es.start()

	ch <- true
	return nil
}

func Stop() (err error) {
	es := GetInstance()
	es.stop()
	return nil
}
func AddEventData(event interface{})  {
	es := GetInstance()
	es.lq.PushItem(event)
}

type EventSender struct {
	once sync.Once
	lq   *q.LoafleQueue
	sc   chan interface{}
}

func (es *EventSender) start() {
	es.sc = make(chan interface{}, 0)

	es.lq = q.NewQueue(DEFAULT_INTERVAL, es.sc)

	go es.checkQueue()
}

func (es *EventSender) stop() {
	if es.sc != nil {
		es.lq.Close()
		close(es.sc)
		es.sc = nil
	}
}

func (es *EventSender) checkQueue() {

	result := make([]*Data, 0)

	for sc := range es.sc {
		items := reflect.ValueOf(sc)
		if items.Kind() != reflect.Slice {
			log.Println("ddddd")
		}

		for i := 0; i < items.Len(); i++ {
			item := items.Index(i).Elem().Interface()
			tempCollectedData := item.(q.Item)
			collectedData := tempCollectedData.Value.(*Data)
			collectedData.AgentId = agentIdentifier()
			result = append(result, collectedData)
			//log.Println("Result Len: ", len(result))
		}
		es.send(result)
		result = nil
	}

}

func (es *EventSender) send(data []*Data) {
	log.Println("Send Started")
	conn, err := grpc.Dial(CENTRAL_ADDR, grpc.WithInsecure())

	if err != nil {
		log.Fatal("Connection Error :", err.Error())
		return
	}
	defer conn.Close()

	client := pb.NewStatusClient(conn)
	out, err := client.Status(context.Background(), &pb.Empty{})

	if err != nil {
		log.Fatal("client Error:", err.Error())
		return
	}
	log.Print(out)
}

func agentIdentifier() string {
	return "agentID_000000001"
}