func (cs *centralServer) RegisterGameServer(args *centralrpc.RegisterGameServerArgs, reply *centralrpc.RegisterGameServerReply) error {
cs.gameServersLock.Lock()
var id uint32
if gs, exists := cs.hostPortToGameServer[args.HostPort]; !exists {
// Check if we hit the limit
if len(cs.gameServers) >= cs.numGameServers {
LOGE.Println("Received request to register game server when ring is FULL")
reply.Status = centralrpc.Full
cs.gameServersLock.Unlock()
return nil
}
// Get a new ID
id = cs.nextGameServerID
cs.nextGameServerID++
// Get host:port
hostport := args.HostPort
// Add new server object to map
gs = &gameServer{paxosrpc.Node{id, hostport}, 0}
cs.gameServers[id] = gs
cs.hostPortToGameServer[hostport] = gs
} else {
id = gs.info.ID
}
// Check if all the game servers in the ring have registered. If they
// haven't, then reply with not ready. Otherwise, reply with OK, send back
// to the unique ID, and the list of all game servers.
if len(cs.gameServers) < cs.numGameServers {
reply.Status = centralrpc.NotReady
} else {
reply.Status = centralrpc.OK
reply.GameServerID = id
// Check if the game servers sliced has been cached. If it hasn't, make it.
if cs.gameServersSlice == nil {
cs.gameServersSlice = make([]paxosrpc.Node, len(cs.gameServers))
i := 0
for _, node := range cs.gameServers {
cs.gameServersSlice[i] = node.info
i++
}
}
reply.Servers = cs.gameServersSlice
}
LOGV.Printf("Received registration request from %d, reply was %d\n", id, reply.Status)
cs.gameServersLock.Unlock()
return nil
}
