Exemplo n.º 1
0
// Start the denominator, all configuration and state is sent via messages
func Start(listener chan gotocol.Message) {
	dunbar := 6 // starting point for how many nodes to remember
	// remember the channel to talk to microservices
	microservices := make(map[string]chan gotocol.Message, dunbar)
	microindex := make([]chan gotocol.Message, dunbar)
	dependencies := make(map[string]time.Time, dunbar)                       // dependent services and time last updated
	var parent chan gotocol.Message                                          // remember how to talk back to creator
	var name string                                                          // remember my name
	hist := collect.NewHist("")                                              // don't know name yet
	eureka := make(map[string]chan gotocol.Message, 3*archaius.Conf.Regions) // service registry per zone and region
	var chatrate time.Duration
	ep, _ := time.ParseDuration(archaius.Conf.EurekaPoll)
	eurekaTicker := time.NewTicker(ep)
	chatTicker := time.NewTicker(time.Hour)
	chatTicker.Stop()
	for {
		select {
		case msg := <-listener:
			collect.Measure(hist, time.Since(msg.Sent))
			if archaius.Conf.Msglog {
				log.Printf("%v: %v\n", name, msg)
			}
			switch msg.Imposition {
			case gotocol.Hello:
				if name == "" {
					// if I don't have a name yet remember what I've been named
					parent = msg.ResponseChan // remember how to talk to my namer
					name = msg.Intention      // message body is my name
					hist = collect.NewHist(name)
				}
			case gotocol.Inform:
				eureka[msg.Intention] = gotocol.InformHandler(msg, name, listener)
			case gotocol.NameDrop:
				gotocol.NameDropHandler(&dependencies, &microservices, msg, name, listener, eureka)
			case gotocol.Forget:
				// forget a buddy
				gotocol.ForgetHandler(&dependencies, &microservices, msg)
			case gotocol.Chat:
				// setup the ticker to run at the specified rate
				d, e := time.ParseDuration(msg.Intention)
				if e == nil && d >= time.Millisecond && d <= time.Hour {
					chatrate = d
					chatTicker = time.NewTicker(chatrate)
				}
			case gotocol.GetResponse:
				// return path from a request, terminate and log
				flow.End(msg.Ctx)
			case gotocol.Goodbye:
				if archaius.Conf.Msglog {
					log.Printf("%v: Going away, was chatting every %v\n", name, chatrate)
				}
				gotocol.Message{gotocol.Goodbye, nil, time.Now(), gotocol.NilContext, name}.GoSend(parent)
				return
			}
		case <-eurekaTicker.C: // check to see if any new dependencies have appeared
			for dep, _ := range dependencies {
				for _, ch := range eureka {
					ch <- gotocol.Message{gotocol.GetRequest, listener, time.Now(), gotocol.NilContext, dep}
				}
			}
		case <-chatTicker.C:
			if len(microservices) > 0 {
				// build index if needed
				if len(microindex) != len(microservices) {
					i := 0
					for _, ch := range microservices {
						microindex[i] = ch
						i++
					}
				}
				m := rand.Intn(len(microservices))
				// start a request to a random member of this denominator
				ctx := gotocol.NewTrace()
				flow.Begin(ctx, name)
				if rand.Intn(2) == 0 {
					gotocol.Message{gotocol.GetRequest, listener, time.Now(), ctx, "why?"}.GoSend(microindex[m])
				} else {
					gotocol.Message{gotocol.Put, listener, time.Now(), ctx, "remember me"}.GoSend(microindex[m])
				}
			}
		}
	}
}
Exemplo n.º 2
0
// Start the denominator, all configuration and state is sent via messages
func Start(listener chan gotocol.Message) {
	dunbar := 6 // starting point for how many nodes to remember
	// remember the channel to talk to microservices
	microservices := make(map[string]chan gotocol.Message, dunbar)
	microindex := make([]chan gotocol.Message, dunbar)
	dependencies := make(map[string]time.Time, dunbar)                       // dependent services and time last updated
	var parent chan gotocol.Message                                          // remember how to talk back to creator
	var name string                                                          // remember my name
	hist := collect.NewHist("")                                              // don't know name yet
	eureka := make(map[string]chan gotocol.Message, 3*archaius.Conf.Regions) // service registry per zone and region
	var chatrate time.Duration
	ep, _ := time.ParseDuration(archaius.Conf.EurekaPoll)
	eurekaTicker := time.NewTicker(ep)
	chatTicker := time.NewTicker(time.Hour)
	chatTicker.Stop()
	w := 1 // counter for random messages
	for {
		select {
		case msg := <-listener:
			flow.Instrument(msg, name, hist)
			switch msg.Imposition {
			case gotocol.Hello:
				if name == "" {
					// if I don't have a name yet remember what I've been named
					parent = msg.ResponseChan // remember how to talk to my namer
					name = msg.Intention      // message body is my name
					hist = collect.NewHist(name)
				}
			case gotocol.Inform:
				eureka[msg.Intention] = handlers.Inform(msg, name, listener)
			case gotocol.NameDrop:
				handlers.NameDrop(&dependencies, &microservices, msg, name, listener, eureka)
			case gotocol.Forget:
				// forget a buddy
				handlers.Forget(&dependencies, &microservices, msg)
			case gotocol.Chat:
				// setup the ticker to run at the specified rate
				d, e := time.ParseDuration(msg.Intention)
				if e == nil && d >= time.Millisecond && d <= time.Hour {
					chatrate = d
					chatTicker = time.NewTicker(chatrate)
				}
			case gotocol.GetResponse:
				// return path from a request, terminate and log
				flow.End(msg.Ctx)
			case gotocol.Goodbye:
				if archaius.Conf.Msglog {
					log.Printf("%v: Going away, was chatting every %v\n", name, chatrate)
				}
				gotocol.Message{gotocol.Goodbye, nil, time.Now(), gotocol.NilContext, name}.GoSend(parent)
				return
			}
		case <-eurekaTicker.C: // check to see if any new dependencies have appeared
			for dep, _ := range dependencies {
				for _, ch := range eureka {
					ch <- gotocol.Message{gotocol.GetRequest, listener, time.Now(), gotocol.NilContext, dep}
				}
			}
		case <-chatTicker.C:
			if len(microservices) > 0 {
				// build index if needed
				if len(microindex) != len(microservices) {
					i := 0
					for _, ch := range microservices {
						microindex[i] = ch
						i++
					}
				}
				m := rand.Intn(len(microservices))
				// start a request to a random member of this denominator
				ctx := gotocol.NewTrace()
				now := time.Now()
				var sm gotocol.Message
				switch rand.Intn(3) {
				case 0:
					sm = gotocol.Message{gotocol.GetRequest, listener, now, ctx, "why?"}
				case 1:
					q := rand.Intn(w) // pick a random key that has already been put
					sm = gotocol.Message{gotocol.GetRequest, listener, now, ctx, fmt.Sprintf("Why%v%v", q, q*q)}
				case 2:
					sm = gotocol.Message{gotocol.Put, listener, now, ctx, fmt.Sprintf("Why%v%v me", w, w*w)}
					w++ // put a new key each time
				}
				flow.AnnotateSend(sm, name) // service send logs creation time for this flow
				sm.GoSend(microindex[m])
			}
		}
	}
}