// The newserver is the actual server where the paxos node runs and also keeps
// information on clients
func NewServer(myhostPort, coordinatorHostPort string, numPaxos, srvId int, hostMap map[int]string) (Server, error) {
if numPaxos < 1 {
return nil, errors.New("numPaxos should be more than 0")
}
s := &server{
hostMap: make(map[int]string),
clients: make(map[int]*client),
clientMutex: sync.Mutex{},
numClients: 0,
srvId: srvId,
bidChan: make(chan string),
}
c, err := rpc.DialHTTP("tcp", coordinatorHostPort)
if err != nil {
fmt.Println(err)
return nil, err
}
args := &coordinatorrpc.RegisterPaxosServerArgs{srvId}
var reply coordinatorrpc.RegisterPaxosServerReply
reply.Status = coordinatorrpc.NotReady
for reply.Status != coordinatorrpc.OK {
err := c.Call("Coordinator.RegisterPaxosServer", args, &reply)
if err != nil {
fmt.Println(err)
return nil, err
}
time.Sleep(time.Duration(rand.Int()%100) * time.Millisecond)
}
pn, err := paxos.NewPaxosNode(myhostPort, hostMap, numPaxos, srvId, numRetries, false)
if err != nil {
fmt.Println("Error starting paxos", err)
return nil, err
}
s.pn = pn
for nodeID, hostPort := range hostMap {
s.hostMap[nodeID] = hostPort
}
// go s.clientHandler()
http.HandleFunc("/bid/", s.bidHandler)
http.HandleFunc("/view/", s.viewHandler)
go http.ListenAndServe(myhostPort, nil)
go s.broadcast()
return s, nil
}
// RegisterPaxosServer is called by paxos nodes to register to the central coordinator
func (c *coordinator) RegisterPaxosServer(args *coordinatorrpc.RegisterPaxosServerArgs, reply *coordinatorrpc.RegisterPaxosServerReply) error {
c.serversMutex.Lock()
nodeID := args.NodeID
_, exists := c.serversMap[nodeID]
if exists == false {
c.serversMap[nodeID] = c.hostMap[nodeID]
}
if len(c.serversMap) >= c.numPaxos {
reply.Status = coordinatorrpc.OK
} else {
reply.Status = coordinatorrpc.NotReady
}
c.serversMutex.Unlock()
return nil
}