// Create a tier and specify any dependencies, return the full name of the last node created
func Create(servicename, packagename string, regions, count int, dependencies ...string) string {
var name string
arch := archaius.Conf.Arch
rnames := archaius.Conf.RegionNames
znames := archaius.Conf.ZoneNames
if regions == 0 { // for dns that isn't in a region or zone
//log.Printf("Create cross region: " + servicename)
name = names.Make(arch, "*", "*", servicename, packagename, 0)
StartNode(name, dependencies...)
}
for r := 0; r < regions; r++ {
if count == 0 { // for AWS services that are cross zone like elb and S3
//log.Printf("Create cross zone: " + servicename)
name = names.Make(arch, rnames[r], "*", servicename, packagename, 0)
StartNode(name, dependencies...)
} else {
//log.Printf("Create service: " + servicename)
cass := make(map[string]mapchan) // for token distribution
for i := r * count; i < (r+1)*count; i++ {
name = names.Make(arch, rnames[r], znames[i%len(archaius.Conf.ZoneNames)], servicename, packagename, i)
//log.Println(dependencies)
StartNode(name, dependencies...)
if packagename == "priamCassandra" {
rz := names.RegionZone(name)
if cass[rz] == nil {
cass[rz] = make(mapchan)
}
cass[rz][name] = noodles[name] // remember the nodes
}
}
if packagename == "priamCassandra" {
// split by zone
for _, v := range cass {
priamCassandra.Distribute(v) // returns a string if it needs logging
}
}
}
}
return name
}
// Start a node using the named package, and connect it to any dependencies
func StartNode(name string, dependencies ...string) {
if names.Package(name) == EurekaPkg {
eurekachan[name] = make(chan gotocol.Message, archaius.Conf.Population/len(archaius.Conf.ZoneNames)) // buffer sized to a zone
go eureka.Start(eurekachan[name], name)
return
} else {
noodles[name] = make(chan gotocol.Message)
}
// start the service and tell it it's name
switch names.Package(name) {
case PiratePkg:
go pirate.Start(noodles[name])
case ElbPkg:
go elb.Start(noodles[name])
case DenominatorPkg:
go denominator.Start(noodles[name])
case ZuulPkg:
go zuul.Start(noodles[name])
case KaryonPkg:
go karyon.Start(noodles[name])
case MonolithPkg:
go monolith.Start(noodles[name])
case StaashPkg:
go staash.Start(noodles[name])
case RiakPkg:
fallthrough // fake Riak using priamCassandra
case PriamCassandraPkg:
go priamCassandra.Start(noodles[name])
case CachePkg:
fallthrough // fake memcache using store
case VolumePkg:
fallthrough // fake disk volume using store
case StorePkg:
go store.Start(noodles[name])
default:
log.Fatal("asgard: unknown package: " + names.Package(name))
}
noodles[name] <- gotocol.Message{gotocol.Hello, listener, time.Now(), gotocol.NilContext, name}
// there is a eureka service registry in each zone, so in-zone services just get to talk to their local registry
// elb are cross zone, so need to see all registries in a region
// denominator are cross region so need to see all registries globally
// priamCassandra depends explicitly on eureka for cross region clusters
crossregion := false
for _, d := range dependencies {
if d == "eureka" {
crossregion = true
}
}
for n, ch := range eurekachan {
if names.Region(name) == "*" || crossregion {
// need to know every eureka in all zones and regions
gotocol.Send(noodles[name], gotocol.Message{gotocol.Inform, ch, time.Now(), gotocol.NilContext, n})
} else {
if names.Zone(name) == "*" && names.Region(name) == names.Region(n) {
// need every eureka in my region
gotocol.Send(noodles[name], gotocol.Message{gotocol.Inform, ch, time.Now(), gotocol.NilContext, n})
} else {
if names.RegionZone(name) == names.RegionZone(n) {
// just the eureka in this specific zone
gotocol.Send(noodles[name], gotocol.Message{gotocol.Inform, ch, time.Now(), gotocol.NilContext, n})
}
}
}
}
//log.Println(dependencies)
// pass on symbolic dependencies without channels that will be looked up in Eureka later
for _, dep := range dependencies {
if dep != "" && dep != "eureka" { // ignore special case of eureka in dependency list
//log.Println(name + " depends on " + dep)
gotocol.Send(noodles[name], gotocol.Message{gotocol.NameDrop, nil, time.Now(), gotocol.NilContext, dep})
}
}
}