Example #1
0
// Start listening, all configuration and state is sent via messages
func Start(listener chan gotocol.Message) {
	// remember the channel to talk to microservices
	microservices := ribbon.MakeRouter()
	dependencies := make(map[string]time.Time)         // dependent services and time last updated
	var parent chan gotocol.Message                    // remember how to talk back to creator
	requestor := make(map[string]gotocol.Routetype)    // remember where requests came from when responding
	var name string                                    // remember my name
	eureka := make(map[string]chan gotocol.Message, 1) // service registry
	hist := collect.NewHist("")
	ep, _ := time.ParseDuration(archaius.Conf.EurekaPoll)
	eurekaTicker := time.NewTicker(ep)
	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.GetRequest:
				// route the request on to microservices
				handlers.GetRequest(msg, name, listener, &requestor, microservices)
			case gotocol.GetResponse:
				// return path from a request, send payload back up using saved span context - server send
				handlers.GetResponse(msg, name, listener, &requestor)
			case gotocol.Put:
				// route the request on to a random dependency
				handlers.Put(msg, name, listener, &requestor, microservices)
			case gotocol.Goodbye:
				for _, ch := range eureka { // tell name service I'm not going to be here
					ch <- gotocol.Message{gotocol.Delete, nil, time.Now(), gotocol.NilContext, name}
				}
				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}
				}
			}
		}
	}
}
Example #2
0
File: fsm.go Project: jgcsco/spigo
// Shutdown fsm and pirates
func shutdown() {
	var msg gotocol.Message
	hist := collect.NewHist("fsm")
	// wait until the delay has finished
	if archaius.Conf.RunDuration >= time.Millisecond {
		time.Sleep(archaius.Conf.RunDuration)
	}
	log.Println("fsm: Shutdown")
	for _, noodle := range noodles {
		gotocol.Message{gotocol.Goodbye, nil, time.Now(), gotocol.NilContext, "beer volcano"}.GoSend(noodle)
	}
	for len(noodles) > 0 {
		msg = <-listener
		collect.Measure(hist, time.Since(msg.Sent))
		if archaius.Conf.Msglog {
			log.Printf("fsm: %v\n", msg)
		}
		switch msg.Imposition {
		case gotocol.Goodbye:
			delete(noodles, msg.Intention)
			if archaius.Conf.Msglog {
				log.Printf("fsm: Pirate population: %v    \n", len(noodles))
			}
		}
	}
	collect.Save()
	log.Println("fsm: Exit")
}
Example #3
0
// Start the denominator, all configuration and state is sent via messages
func Start(listener chan gotocol.Message) {
	microservices := ribbon.MakeRouter()
	dependencies := make(map[string]time.Time)                                                          // dependent services and time last updated
	var parent chan gotocol.Message                                                                     // remember how to talk back to creator
	var name string                                                                                     // remember my name
	nethist := collect.NewHist("")                                                                      // don't know name yet - message network latency
	resphist := collect.NewHist("")                                                                     // response time history
	servhist := collect.NewHist("")                                                                     // service time history
	rthist := collect.NewHist("")                                                                       // round trip history
	eureka := make(map[string]chan gotocol.Message, len(archaius.Conf.ZoneNames)*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, nethist)
			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
					nethist = collect.NewHist(name + "_net")
					resphist = collect.NewHist(name + "_resp")
					servhist = collect.NewHist(name + "_serv")
					rthist = collect.NewHist(name + "_rt")
				}
			case gotocol.Inform:
				eureka[msg.Intention] = handlers.Inform(msg, name, listener)
			case gotocol.NameDrop:
				handlers.NameDrop(&dependencies, microservices, msg, name, listener, eureka, true)
			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 response time in histograms
				flow.End(msg, resphist, servhist, rthist)
			case gotocol.Goodbye:
				if archaius.Conf.Msglog {
					log.Printf("%v: Going away, was chatting every %v\n", name, chatrate)
				}
				collect.SaveHist(nethist, name, "_net")
				collect.SaveHist(resphist, name, "_resp")
				collect.SaveHist(servhist, name, "_serv")
				collect.SaveHist(rthist, name, "_rt")
				collect.SaveAllGuesses(name)
				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:
			c := microservices.Random()
			if c != nil {
				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(c)
			}
		}
	}
}
Example #4
0
// Start eureka discovery service and set name directly
func Start(listener chan gotocol.Message, name string) {
	// use a waitgroup so whoever starts eureka can tell it's ready and when stopping that the logs have been flushed
	Wg.Add(1)
	defer Wg.Done()
	var msg gotocol.Message
	var ok bool
	hist := collect.NewHist(name)
	microservices := make(map[string]chan gotocol.Message, archaius.Conf.Dunbar)
	eurekaservices := make(map[string]chan gotocol.Message, 2)
	metadata := make(map[string]meta, archaius.Conf.Dunbar)
	lastrequest := make(map[callback]time.Time) // remember time of last request for a service from this requestor
	log.Println(name + ": starting")
	for {
		msg, ok = <-listener
		collect.Measure(hist, time.Since(msg.Sent))
		if !ok {
			break // channel was closed
		}
		//commented out because name service traffic is too much noise in the log
		//if archaius.Conf.Msglog {
		//	log.Printf("%v(backlog %v): %v\n", name, len(listener), msg)
		//}
		switch msg.Imposition {
		// used to wire up connections to other eureka nodes only
		case gotocol.NameDrop:
			if msg.Intention != name { // don't talk to myself
				eurekaservices[msg.Intention] = msg.ResponseChan
			}
		// for new nodes record the data, replicate and maybe pass on to be logged
		case gotocol.Put:
			if microservices[msg.Intention] == nil { // ignore duplicate requests
				microservices[msg.Intention] = msg.ResponseChan
				metadata[msg.Intention] = meta{true, msg.Sent}
				// replicate request, everyone ends up with the same timestamp for state change of this service
				for _, c := range eurekaservices {
					gotocol.Message{gotocol.Replicate, msg.ResponseChan, msg.Sent, gotocol.NilContext, msg.Intention}.GoSend(c)
				}
				if edda.Logchan != nil {
					edda.Logchan <- msg
				}
			}
		case gotocol.Replicate:
			if microservices[msg.Intention] == nil { // ignore multiple requests
				microservices[msg.Intention] = msg.ResponseChan
				metadata[msg.Intention] = meta{true, msg.Sent}
			}
		case gotocol.Inform:
			// don't store edges in discovery but do log them
			if edda.Logchan != nil {
				edda.Logchan <- msg
			}
		case gotocol.GetRequest:
			if msg.Intention == "" {
				log.Fatal(name + ": empty GetRequest")
			}
			if microservices[msg.Intention] != nil { // matched a unique full name
				gotocol.Message{gotocol.NameDrop, microservices[msg.Intention], time.Now(), gotocol.NilContext, msg.Intention}.GoSend(msg.ResponseChan)
				break
			}
			for n, ch := range microservices { // respond with all the online names that match the service component
				if names.Service(n) == msg.Intention {
					// if there was an update for the looked up service since last check
					// log.Printf("%v: matching %v with %v, last: %v metadata: %v\n", name, n, msg.Intention, lastrequest[callback{n, msg.ResponseChan}], metadata[n].registered)
					if metadata[n].registered.After(lastrequest[callback{n, msg.ResponseChan}]) {
						if metadata[n].online {
							gotocol.Message{gotocol.NameDrop, ch, time.Now(), gotocol.NilContext, n}.GoSend(msg.ResponseChan)
						} else {
							//log.Printf("%v:Forget %v\n", name, n)
							gotocol.Message{gotocol.Forget, ch, time.Now(), gotocol.NilContext, n}.GoSend(msg.ResponseChan)
						}
					}
					// remember for next time
					lastrequest[callback{n, msg.ResponseChan}] = msg.Sent
				}
			}
		case gotocol.Delete: // remove a node
			if microservices[msg.Intention] != nil { // matched a unique full name
				metadata[msg.Intention] = meta{false, time.Now()}
				// replicate request
				for _, c := range eurekaservices {
					gotocol.Message{gotocol.Replicate, nil, time.Now(), gotocol.NilContext, msg.Intention}.GoSend(c)
				}
				if edda.Logchan != nil {
					edda.Logchan <- msg
				}
			}
		case gotocol.Goodbye:
			gotocol.Message{gotocol.Goodbye, nil, time.Now(), gotocol.NilContext, name}.GoSend(msg.ResponseChan)
			log.Println(name + ": closing")
			return
		}
	}
}
Example #5
0
// Start staash, all configuration and state is sent via messages
func Start(listener chan gotocol.Message) {
	microservices := ribbon.MakeRouter()                     // outbound routes
	var caches, stores, volumes, cass, staash *ribbon.Router // subsets of the router
	dependencies := make(map[string]time.Time)               // dependent service names and time last updated
	var parent chan gotocol.Message                          // remember how to talk back to creator
	requestor := make(map[string]gotocol.Routetype)          // remember where requests came from when responding
	var name string                                          // remember my name
	eureka := make(map[string]chan gotocol.Message, 1)       // service registry
	hist := collect.NewHist("")
	ep, _ := time.ParseDuration(archaius.Conf.EurekaPoll)
	eurekaTicker := time.NewTicker(ep)
	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, true) // true to setup cross zone routing
				caches = microservices.All(CachePkg)
				volumes = microservices.All(VolumePkg)
				stores = microservices.All(StorePkg)
				cass = microservices.All(PriamCassandraPkg)
				staash = microservices.All(StaashPkg)
			case gotocol.Forget:
				// forget a buddy
				handlers.Forget(&dependencies, microservices, msg)
				caches = microservices.All(CachePkg)
				volumes = microservices.All(VolumePkg)
				stores = microservices.All(StorePkg)
				cass = microservices.All(PriamCassandraPkg)
				staash = microservices.All(StaashPkg)
			case gotocol.GetRequest:
				// route the request on to a cache first if configured
				r := gotocol.PickRoute(requestor, msg)
				if caches.Len() > 0 {
					handlers.GetRequest(msg, name, listener, &requestor, caches)
					r.State = cacheLookup
				} else {
					// route to any volumes if configured
					if volumes.Len() > 0 {
						handlers.GetRequest(msg, name, listener, &requestor, volumes)
						r.State = volumeLookup
					} else {
						// route to any cassandra if configured
						if cass.Len() > 0 {
							handlers.GetRequest(msg, name, listener, &requestor, cass)
							r.State = cassandraLookup
						} else {
							// route to stores if configured
							if stores.Len() > 0 {
								handlers.GetRequest(msg, name, listener, &requestor, stores)
								r.State = storeLookup
							} else {
								// route to more staash layers if configured
								if staash.Len() > 0 {
									handlers.GetRequest(msg, name, listener, &requestor, staash)
									r.State = staashLookup
								}
							}
						}
					}
				}
				//log.Printf("%v: %v route: %v", name, msg.Context, r)
			case gotocol.GetResponse:
				// return path from a request, resend or send payload back up using saved span context - server send
				r := gotocol.PickRoute(requestor, msg)
				if msg.Intention != "" { // we got a value, so pass it back up
					handlers.GetResponse(msg, name, listener, &requestor)
				} else {
					switch r.State {
					case cacheLookup:
						if volumes.Len() > 0 {
							handlers.GetRequest(msg, name, listener, &requestor, volumes)
							r.State = volumeLookup
							break
						}
						fallthrough // no volumes so look for cassandra
					case volumeLookup:
						if cass.Len() > 0 {
							handlers.GetRequest(msg, name, listener, &requestor, cass)
							r.State = cassandraLookup
							break
						}
						fallthrough // no cassandra so look for stores
					case cassandraLookup:
						if stores.Len() > 0 {
							handlers.GetRequest(msg, name, listener, &requestor, stores)
							r.State = storeLookup
							break
						}
						fallthrough // no stores
					case storeLookup:
						if staash.Len() > 0 {
							handlers.GetRequest(msg, name, listener, &requestor, staash)
							r.State = staashLookup
							break
						}
						fallthrough // no staash
					case staashLookup:
						// ran out of options to find anything so pass empty response back up
						handlers.GetResponse(msg, name, listener, &requestor)
					case newRequest:
					default:
					}
				}
			case gotocol.Put:
				// duplicate the request to any cache, volumes, stores, and cassandra but only to one of each type
				// storage class packages sideways Replicate if configured
				// to get a lossy write, configure multiple stores that don't cross replicate
				handlers.Put(msg, name, listener, &requestor, caches)
				handlers.Put(msg, name, listener, &requestor, cass)
				handlers.Put(msg, name, listener, &requestor, staash)
				handlers.Put(msg, name, listener, &requestor, stores)
				msg.Intention = names.Instance(name) + "/" + msg.Intention // store to an instance specific volume namespace
				handlers.Put(msg, name, listener, &requestor, volumes)
			case gotocol.Goodbye:
				for _, ch := range eureka { // tell name service I'm not going to be here
					ch <- gotocol.Message{gotocol.Delete, nil, time.Now(), gotocol.NilContext, name}
				}
				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}
				}
			}
		}
	}
}
Example #6
0
// Start the pirate, all configuration and state is sent via messages
func Start(listener chan gotocol.Message) {
	dunbar := 10 // starting point for how many buddies to remember
	// remember the channel to talk to named buddies
	buddies := make(map[string]chan gotocol.Message, dunbar)
	// remember who sent GoldCoin and how much, to buy favors
	benefactors := make(map[string]int, dunbar)
	var booty int                   // current GoldCoin balance
	var fsm chan gotocol.Message    // remember how to talk back to creator
	var name string                 // remember my name
	var logger chan gotocol.Message // if set, send updates
	var chatrate time.Duration
	hist := collect.NewHist("")
	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
					fsm = msg.ResponseChan // remember how to talk to my namer
					name = msg.Intention   // message body is my name
					hist = collect.NewHist(name)
				}
			case gotocol.Inform:
				// remember where to send updates
				logger = handlers.Inform(msg, name, listener)
			case gotocol.NameDrop:
				// don't remember too many buddies and don't talk to myself
				buddy := msg.Intention // message body is buddy name
				if len(buddies) < dunbar && buddy != name {
					// remember how to talk to this buddy
					buddies[buddy] = msg.ResponseChan // message channel is buddy's listener
					if logger != nil {
						// if it's setup, tell the logger I have a new buddy to talk to
						logger <- gotocol.Message{gotocol.Inform, listener, time.Now(), gotocol.NilContext, name + " " + buddy}
					}
				}
			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)
					// assume we got paid before we started chatting
					rand.Seed(int64(booty))
				}
			case gotocol.GoldCoin:
				var coin int
				_, e := fmt.Sscanf(msg.Intention, "%d", &coin)
				if e == nil && coin > 0 {
					booty += coin
					for name, ch := range buddies {
						if ch == msg.ResponseChan {
							benefactors[name] += coin
						}
					}
				}
			case gotocol.Goodbye:
				if archaius.Conf.Msglog {
					log.Printf("%v: Going away with %v gold coins, chatting every %v\n", name, booty, chatrate)
				}
				gotocol.Message{gotocol.Goodbye, nil, time.Now(), gotocol.NilContext, name}.GoSend(fsm)
				return
			}
		case <-chatTicker.C:
			if rand.Intn(100) < 50 { // 50% of the time
				// use Namedrop to tell the last buddy about the first
				var firstBuddyName string
				var firstBuddyChan, lastBuddyChan chan gotocol.Message
				if len(buddies) >= 2 {
					for name, ch := range buddies {
						if firstBuddyName == "" {
							firstBuddyName = name
							firstBuddyChan = ch
						} else {
							lastBuddyChan = ch
						}
						gotocol.Message{gotocol.NameDrop, firstBuddyChan, time.Now(), gotocol.NewTrace(), firstBuddyName}.GoSend(lastBuddyChan)
					}
				}
			} else {
				// send a buddy some money
				if booty > 0 {
					donation := rand.Intn(booty)
					luckyNumber := rand.Intn(len(buddies))
					if donation > 0 {
						for _, ch := range buddies {
							if luckyNumber == 0 {
								gotocol.Message{gotocol.GoldCoin, listener, time.Now(), gotocol.NewTrace(), fmt.Sprintf("%d", donation)}.GoSend(ch)
								booty -= donation
								break
							} else {
								luckyNumber--
							}
						}
					}
				}
			}
		}
	}
}
Example #7
0
File: edda.go Project: jgcsco/spigo
// Start edda, to listen for logging data from services
func Start(name string) {
	// use a waitgroup so whoever starts edda can tell the logs have been flushed
	Wg.Add(1)
	defer Wg.Done()
	if Logchan == nil {
		return
	}
	var msg gotocol.Message
	microservices := make(map[string]bool, archaius.Conf.Dunbar)
	edges := make(map[string]bool, archaius.Conf.Dunbar)
	var ok bool
	hist := collect.NewHist(name)
	log.Println(name + ": starting")
	if archaius.Conf.GraphmlFile != "" {
		graphml.Setup(archaius.Conf.GraphmlFile)
	}
	if archaius.Conf.GraphjsonFile != "" {
		graphjson.Setup(archaius.Conf.GraphjsonFile)
	}
	if archaius.Conf.Neo4jURL != "" {
		graphneo4j.Setup(archaius.Conf.Neo4jURL)
	}
	for {
		msg, ok = <-Logchan
		collect.Measure(hist, time.Since(msg.Sent))
		if !ok {
			break // channel was closed
		}
		if archaius.Conf.Msglog {
			log.Printf("%v(backlog %v): %v\n", name, len(Logchan), msg)
		}
		switch msg.Imposition {
		case gotocol.Inform:
			edge := names.FilterEdge(msg.Intention)
			if edges[edge] == false { // only log an edge once
				edges[edge] = true
				graphml.WriteEdge(edge)
				graphjson.WriteEdge(edge, msg.Sent)
				graphneo4j.WriteEdge(strings.Replace(msg.Intention, "-", "_", -1), msg.Sent)
			}
		case gotocol.Put:
			node := names.FilterNode(msg.Intention)
			if microservices[node] == false { // only log a node once
				microservices[node] = true
				graphml.WriteNode(node + " " + names.Package(msg.Intention))
				graphjson.WriteNode(node+" "+names.Package(msg.Intention), msg.Sent)
				graphneo4j.WriteNode(strings.Replace(msg.Intention, "-", "_", -1)+" "+names.Package(msg.Intention), msg.Sent)
			}
		case gotocol.Forget: // forget the edge
			// problem here in that edges may be reported multiple times from several sources
			// however after filtering all matching edges are reported as forgotten when the first is
			// need to maintain the full model and a filtered model with counts
			edge := names.FilterEdge(msg.Intention)
			if edges[edge] == true { // only remove an edge once
				edges[edge] = false
				graphjson.WriteForget(edge, msg.Sent)
			}
		case gotocol.Delete: // remove the node
			node := names.FilterNode(msg.Intention)
			if microservices[node] == true { // only remove nodes that exist, and only log it once
				microservices[node] = false
				graphjson.WriteDone(node, msg.Sent)
			}
		}
	}
	log.Println(name + ": closing")
	graphml.Close()
	graphjson.Close()
	graphneo4j.Close()
}
Example #8
0
// Start store, all configuration and state is sent via messages
func Start(listener chan gotocol.Message) {
	// remember the channel to talk to microservices
	microservices := ribbon.MakeRouter()
	dependencies := make(map[string]time.Time) // dependent services and time last updated
	store := make(map[string]string, 4)        // key value store
	store["why?"] = "because..."
	var netflixoss chan gotocol.Message                                           // remember creator and how to talk back to incoming requests
	var name string                                                               // remember my name
	eureka := make(map[string]chan gotocol.Message, len(archaius.Conf.ZoneNames)) // service registry per zone
	hist := collect.NewHist("")
	ep, _ := time.ParseDuration(archaius.Conf.EurekaPoll)
	eurekaTicker := time.NewTicker(ep)
	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
					netflixoss = 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: // cross zone = true
				handlers.NameDrop(&dependencies, microservices, msg, name, listener, eureka, true)
			case gotocol.Forget:
				// forget a buddy
				handlers.Forget(&dependencies, microservices, msg)
			case gotocol.GetRequest:
				// return any stored value for this key
				outmsg := gotocol.Message{gotocol.GetResponse, listener, time.Now(), msg.Ctx, store[msg.Intention]}
				flow.AnnotateSend(outmsg, name)
				outmsg.GoSend(msg.ResponseChan)
			case gotocol.GetResponse:
				// return path from a request, send payload back up (not currently used)
			case gotocol.Put:
				// set a key value pair and replicate to other stores
				var key, value string
				fmt.Sscanf(msg.Intention, "%s%s", &key, &value)
				if key != "" && value != "" {
					store[key] = value
					// duplicate the request on to all connected store nodes with the same package name as this one
					for _, n := range microservices.All(names.Package(name)).Names() {
						outmsg := gotocol.Message{gotocol.Replicate, listener, time.Now(), msg.Ctx.NewParent(), msg.Intention}
						flow.AnnotateSend(outmsg, name)
						outmsg.GoSend(microservices.Named(n))
					}
				}
			case gotocol.Replicate:
				// Replicate is used between store nodes
				// end point for a request
				var key, value string
				fmt.Sscanf(msg.Intention, "%s%s", &key, &value)
				// log.Printf("store: %v:%v", key, value)
				if key != "" && value != "" {
					store[key] = value
				}
			case gotocol.Goodbye:
				gotocol.Message{gotocol.Goodbye, nil, time.Now(), gotocol.NilContext, name}.GoSend(netflixoss)
				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}
				}
			}
		}
	}
}
Example #9
0
// Start priamCassandra, all configuration and state is sent via messages
func Start(listener chan gotocol.Message) {
	// remember the channel to talk to microservices
	microservices := ribbon.MakeRouter()
	// track the hash values owned by each node in the ring
	var ring ByToken
	dependencies := make(map[string]time.Time) // dependent services and time last updated
	store := make(map[string]string, 4)        // key value store
	store["why?"] = "because..."
	var parent chan gotocol.Message                                                                     // remember how to talk back to creator
	var name string                                                                                     // remember my name
	eureka := make(map[string]chan gotocol.Message, len(archaius.Conf.ZoneNames)*archaius.Conf.Regions) // service registry per zone and region
	hist := collect.NewHist("")
	ep, _ := time.ParseDuration(archaius.Conf.EurekaPoll)
	eurekaTicker := time.NewTicker(ep)
	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: // cross zone = true
				handlers.NameDrop(&dependencies, microservices, msg, name, listener, eureka, true)
			case gotocol.Forget:
				// forget a buddy
				handlers.Forget(&dependencies, microservices, msg)
			case gotocol.Chat:
				// Gossip setup notification of hash values for nodes, cass1:123,cass2:456
				ring = RingConfig(msg.Intention)
			case gotocol.GetRequest:
				// see if the data is stored on this node
				i := ring.Find(ringHash(msg.Intention))
				//log.Printf("%v: %v %v\n", name, i, ringHash(msg.Intention))
				if len(ring) == 0 || ring[i].name == name { // ring is setup so only respond if this is the right place
					// return any stored value for this key (Cassandra READ.ONE behavior)
					outmsg := gotocol.Message{gotocol.GetResponse, listener, time.Now(), msg.Ctx, store[msg.Intention]}
					flow.AnnotateSend(outmsg, name)
					outmsg.GoSend(msg.ResponseChan)
				} else {
					// forward the message to the right place, but don't change the ResponseChan or span
					outmsg := gotocol.Message{gotocol.GetRequest, msg.ResponseChan, time.Now(), msg.Ctx.AddSpan(), msg.Intention}
					flow.AnnotateSend(outmsg, name)
					outmsg.GoSend(microservices.Named(ring[i].name))
				}
			case gotocol.GetResponse:
				// return path from a request, send payload back up, not used by priamCassandra currently
			case gotocol.Put:
				// set a key value pair and replicate globally
				var key, value string
				fmt.Sscanf(msg.Intention, "%s%s", &key, &value)
				if key != "" && value != "" {
					i := ring.Find(ringHash(key))
					if len(ring) == 0 || ring[i].name == name { // ring is setup so only store if this is the right place
						store[key] = value
					} else {
						// forward the message to the right place, but don't change the ResponseChan or context parent
						outmsg := gotocol.Message{gotocol.Put, msg.ResponseChan, time.Now(), msg.Ctx.AddSpan(), msg.Intention}
						flow.AnnotateSend(outmsg, name)
						outmsg.GoSend(microservices.Named(ring[i].name))
					}
					// duplicate the request on to priamCassandra nodes in each zone and one in each region
					for _, z := range names.OtherZones(name, archaius.Conf.ZoneNames) {
						// replicate request
						for _, n := range microservices.Names() {
							if names.Region(n) == names.Region(name) && names.Zone(n) == z {
								outmsg := gotocol.Message{gotocol.Replicate, listener, time.Now(), msg.Ctx.NewParent(), msg.Intention}
								flow.AnnotateSend(outmsg, name)
								outmsg.GoSend(microservices.Named(n))
								break // only need to send it to one node in each zone
							}
						}
					}
					for _, r := range names.OtherRegions(name, archaius.Conf.RegionNames[0:archaius.Conf.Regions]) {
						for _, n := range microservices.Names() {
							if names.Region(n) == r {
								outmsg := gotocol.Message{gotocol.Replicate, listener, time.Now(), msg.Ctx.NewParent(), msg.Intention}
								flow.AnnotateSend(outmsg, name)
								outmsg.GoSend(microservices.Named(n))
								break // only need to send it to one node in each region
							}
						}
					}
				}
			case gotocol.Replicate:
				// Replicate is only used between priamCassandra nodes
				// end point for a request
				var key, value string
				fmt.Sscanf(msg.Intention, "%s%s", &key, &value)
				// log.Printf("priamCassandra: %v:%v", key, value)
				if key != "" && value != "" {
					i := ring.Find(ringHash(key))
					if len(ring) == 0 || ring[i].name == name { // ring is setup so only store if this is the right place
						store[key] = value
					} else {
						// forward the message to the right place, but don't change the ResponseChan
						outmsg := gotocol.Message{gotocol.Replicate, msg.ResponseChan, time.Now(), msg.Ctx, msg.Intention}
						flow.AnnotateSend(outmsg, name)
						outmsg.GoSend(microservices.Named(ring[i].name))
					}
				}
				// name looks like: netflixoss.us-east-1.zoneC.cassTurtle.priamCassandra.cassTurtle11
				myregion := names.Region(name)
				//log.Printf("%v: %v\n", name, myregion)
				// find if this was a cross region Replicate
				// find the name matching incoming request channel to see where its coming from
				in := microservices.NameChan(msg.ResponseChan)
				if in != "" && myregion != names.Region(in) {
					// Replicate from out of region needs to be Replicated once only to other zones in this Region
					for _, z := range names.OtherZones(name, archaius.Conf.ZoneNames) {
						// replicate request
						for _, n := range microservices.Names() {
							if names.Region(n) == myregion && names.Zone(n) == z {
								outmsg := gotocol.Message{gotocol.Replicate, listener, time.Now(), msg.Ctx.NewParent(), msg.Intention}
								flow.AnnotateSend(outmsg, name)
								outmsg.GoSend(microservices.Named(n))
								break // only need to send it to one node in each zone
							}
						}
					}
					break
				}
			case gotocol.Goodbye:
				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}
				}
			}
		}
	}
}