func (pn *paxosNode) DoAccept(args *paxosrpc.AcceptArgs, reply *paxosrpc.AcceptReply) error {
LOGV.Printf("node %d DoAccept:%d %s %d\n", pn.nodeID, args.SlotIdx, args.V.ToString(), args.N)
replychan := make(chan *paxosrpc.AcceptReply, len(pn.peers))
for i, n := range pn.peers {
go func(idx int, peernode Node) {
r := new(paxosrpc.AcceptReply)
if peernode.HostPort == pn.addrport {
pn.Accept(args, r)
replychan <- r
} else {
peer, err := rpcwrapper.DialHTTP("tcp", peernode.HostPort)
if err != nil {
LOGE.Printf("node %d Cannot reach peer %d:%s\n", pn.nodeID, idx, peernode.HostPort)
r.Status = paxosrpc.Reject
replychan <- r
return
}
prepareCall := peer.Go("PaxosNode.Accept", args, r, nil)
select {
case _, _ = <-prepareCall.Done:
replychan <- r
case _ = <-time.After(time.Second):
r.Status = paxosrpc.Reject
replychan <- r
}
peer.Close()
}
}(i, n)
}
numOK := 0
numRej := 0
for num := 0; num < pn.numNodes; num++ {
r, _ := <-replychan
if r.Status != paxosrpc.Reject {
numOK++
} else {
numRej++
}
}
LOGV.Printf("node %d DoAccept %d result: [%dOK %dRej]\n", pn.nodeID, args.SlotIdx, numOK, numRej)
if numOK > len(pn.peers)/2 {
reply.Status = paxosrpc.OK
return nil
} else {
reply.Status = paxosrpc.Reject
return nil
}
}
func (pn *paxosNode) Accept(args *paxosrpc.AcceptArgs, reply *paxosrpc.AcceptReply) error {
LOGV.Printf("node %d OnAccept:%d %s %d\n", pn.nodeID, args.SlotIdx, args.V.ToString(), args.N)
LOGV2.Printf("node %d get lock in Accept()\n", pn.nodeID)
pn.cmdMutex.Lock()
v, ok := pn.tempSlots[args.SlotIdx]
if ok && args.N >= v.Nh {
/*if v.isAccepted || v.isCommited { //accepted or commited state
v.Nh = args.N
reply.Status = paxosrpc.OK
return nil
} else { //prepare state*/
v.isAccepted = true
v.Na = args.N
v.Nh = args.N
v.V = args.V
pn.tempSlots[args.SlotIdx] = v
reply.Status = paxosrpc.OK
//return nil
// }
} else if !ok {
ic := IndexCommand{}
ic.Index = args.SlotIdx
ic.Na = args.N
ic.Nh = args.N
ic.V = args.V
ic.isAccepted = true
ic.isCommited = false
pn.tempSlots[args.SlotIdx] = ic
reply.Status = paxosrpc.OK
} else {
reply.Status = paxosrpc.Reject
}
LOGV2.Printf("node %d release lock in Accept()\n", pn.nodeID)
pn.cmdMutex.Unlock()
LOGV.Printf("node %d leaving OnAccept(%d %s %d)\t[%d]\n", pn.nodeID, args.SlotIdx, args.V.ToString(), args.N, reply.Status)
return nil
}