// Start staash, all configuration and state is sent via messages
func Start(listener chan gotocol.Message) {
dunbar := archaius.Conf.Population // 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(map[int]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
requestor := make(map[gotocol.TraceContextType]chan gotocol.Message) // remember where requests came from
var name string // remember my name
eureka := make(map[string]chan gotocol.Message, 1) // service registry
var chatrate time.Duration
hist := collect.NewHist("")
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, µservices, msg, name, listener, eureka)
case gotocol.Forget:
// forget a buddy
gotocol.ForgetHandler(&dependencies, µservices, 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.GetRequest:
// route the request on to microservices
requestor[msg.Ctx.Trace] = msg.ResponseChan
// Intention body indicates which service to route to or which key to get
// need to lookup service by type rather than randomly call one day
if len(microservices) > 0 {
if len(microindex) != len(microservices) {
// rebuild index
i := 0
for _, ch := range microservices {
microindex[i] = ch
i++
}
}
m := rand.Intn(len(microservices))
span := msg.Ctx.NewSpan()
flow.Update(span, name)
// start a request to a random service
gotocol.Message{gotocol.GetRequest, listener, time.Now(), span, msg.Intention}.GoSend(microindex[m])
}
case gotocol.GetResponse:
// return path from a request, send payload back up
if requestor[msg.Ctx.Trace] != nil {
span := msg.Ctx.NewSpan()
flow.Update(span, name)
gotocol.Message{gotocol.GetResponse, listener, time.Now(), span, msg.Intention}.GoSend(requestor[msg.Ctx.Trace])
delete(requestor, msg.Ctx.Trace)
}
case gotocol.Put:
// route the request on to a random dependency
if len(microservices) > 0 {
if len(microindex) != len(microservices) {
// rebuild index
i := 0
for _, ch := range microservices {
microindex[i] = ch
i++
}
}
m := rand.Intn(len(microservices))
span := msg.Ctx.NewSpan()
flow.Update(span, name)
// pass on request to a random service
gotocol.Message{gotocol.Put, listener, time.Now(), span, msg.Intention}.GoSend(microindex[m])
}
case gotocol.Goodbye:
if archaius.Conf.Msglog {
log.Printf("%v: Going away\n", name)
}
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}
}
}
case <-chatTicker.C:
if len(microservices) > 0 {
if len(microservices) != len(microindex) {
// rebuild index
i := 0
for _, ch := range microservices {
microindex[i] = ch
i++
}
}
m := rand.Intn(len(microservices))
// start a request to a random member of this elb
gotocol.Message{gotocol.GetRequest, listener, time.Now(), gotocol.NewTrace(), name}.GoSend(microindex[m])
}
}
}
}
// Start priamCassandra, all configuration and state is sent via messages
func Start(listener chan gotocol.Message) {
dunbar := archaius.Conf.Population // starting point for how many nodes to remember
// remember the channel to talk to microservices
microservices := make(map[string]chan gotocol.Message, dunbar)
// track the hash values owned by each node in the ring
var ring ByToken
dependencies := make(map[string]time.Time, dunbar) // 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, 3*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:
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: // cross zone = true
gotocol.NameDropHandler(&dependencies, µservices, msg, name, listener, eureka, true)
case gotocol.Forget:
// forget a buddy
gotocol.ForgetHandler(&dependencies, µservices, 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))
span := msg.Ctx.NewSpan()
flow.Update(span, name)
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)
gotocol.Message{gotocol.GetResponse, listener, time.Now(), span, store[msg.Intention]}.GoSend(msg.ResponseChan)
} else {
// send the message to the right place, but don't change the ResponseChan
gotocol.Message{gotocol.GetRequest, msg.ResponseChan, time.Now(), span, msg.Intention}.GoSend(microservices[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
span := msg.Ctx.NewSpan()
flow.Update(span, name)
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 {
// send the message to the right place, but don't change the ResponseChan
gotocol.Message{gotocol.Put, msg.ResponseChan, time.Now(), span, msg.Intention}.GoSend(microservices[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, c := range microservices {
if names.Region(n) == names.Region(name) && names.Zone(n) == z {
gotocol.Message{gotocol.Replicate, listener, time.Now(), span, msg.Intention}.GoSend(c)
break // only need to send it to one node in each zone, no tokens yet
}
}
}
for _, r := range names.OtherRegions(name, archaius.Conf.RegionNames[0:archaius.Conf.Regions]) {
for n, c := range microservices {
if names.Region(n) == r {
gotocol.Message{gotocol.Replicate, listener, time.Now(), span, msg.Intention}.GoSend(c)
break // only need to send it to one node in each region, no tokens yet
}
}
}
}
case gotocol.Replicate:
// Replicate is only used between priamCassandra nodes
// end point for a request
var key, value string
span := msg.Ctx.NewSpan()
flow.Update(span, name)
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 {
// send the message to the right place, but don't change the ResponseChan
gotocol.Message{gotocol.Replicate, msg.ResponseChan, time.Now(), span, msg.Intention}.GoSend(microservices[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
for in, c := range microservices {
// find the name matching incoming request channel to see where its coming from
if c == msg.ResponseChan && 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, c := range microservices {
if names.Region(n) == myregion && names.Zone(n) == z {
gotocol.Message{gotocol.Replicate, listener, time.Now(), span, msg.Intention}.GoSend(c)
break // only need to send it to one node in each zone, no tokens yet
}
}
}
break
}
}
case gotocol.Goodbye:
if archaius.Conf.Msglog {
log.Printf("%v: Going away, zone: %v\n", name, store["zone"])
}
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}
}
}
}
}
}
// 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:
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, µservices, msg, name, listener, eureka)
case gotocol.Forget:
// forget a buddy
gotocol.ForgetHandler(&dependencies, µservices, 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.Update(msg.Ctx, name)
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.Update(ctx, name)
switch rand.Intn(3) {
case 0:
gotocol.Message{gotocol.GetRequest, listener, time.Now(), ctx, "why?"}.GoSend(microindex[m])
case 1:
q := rand.Intn(w) // pick a random key that has already been put
gotocol.Message{gotocol.GetRequest, listener, time.Now(), ctx, fmt.Sprintf("Why%v%v", q, q*q)}.GoSend(microindex[m])
case 2:
gotocol.Message{gotocol.Put, listener, time.Now(), ctx, fmt.Sprintf("Why%v%v me", w, w*w)}.GoSend(microindex[m])
w++ // put a new key each time
}
}
}
}
}