func runSlave(masterAddr string, httpAddr string) {
var sr *ServiceRegistry.ServiceRegistry
sru1 := make(chan *ServiceRegistry.ServiceRegistry)
go replication.StartSlave(masterAddr, sru1)
log.Println("[Main] Master is", masterAddr)
h := http.NewBalancer()
finished, requestUpdate, sru2 := h.RunHTTP(httpAddr)
for {
select {
case <-finished:
log.Println("[Main] HTTP server has exited, so I might as well quit")
return
case <-requestUpdate:
log.Println("[Main] Ignoring request for an update")
case sr = <-sru1:
log.Println("[Main] Got updated service registry")
sru2 <- *sr
}
}
}
// The Master is the thing which allows slaves to connect and get updates
func runMaster(httpAddr string, httpUpdateAddr string) {
var sr *ServiceRegistry.ServiceRegistry
// The Persistor is the thing which saves any updates to Redis
// Also the initial ServiceRegistry is loaded from it
p := persistor.NewPersistor()
sru1 := p.Listen()
sr = p.LoadServiceRegistry("FirstRegistry")
rep := replication.NewMaster()
sru2 := rep.StartListener()
h := http.NewBalancer()
finished1, requestUpdate, sru3 := h.RunHTTP(httpAddr)
u := update.NewUpdater()
finished2 := u.RunHTTP(httpUpdateAddr, sr)
sr.RegisterUpdateChannel(sru1)
sr.RegisterUpdateChannel(sru2)
sr.RegisterUpdateChannel(sru3)
for {
select {
case <-finished1:
return
case <-finished2:
return
case <-requestUpdate:
log.Println("[Main] Someone has requested an update")
sr.SendRegistryUpdate()
case <-time.After(30 * time.Second):
sru1 <- *sr
}
}
}