void ClusterMembership::decodePacket(const char *buf, int len, const IpAddress & src)
{
// Check length acceptable
if (len < 20) return;
// Check magic number
unsigned int magic = ntohl(* (unsigned int *) buf);
if (magic != MagicNumber) return;
CommandType cmd = (CommandType) ntohl(* (unsigned int *) (buf + 12));
// See if it's a "set weight" packet
if (cmd == CommandSetWeight) {
handleSetWeight(buf, len, src);
return;
}
// Otherwise, it's a normal multicast pkt.
// Check cluster IP
IpAddress decode_clusteraddr;
decode_clusteraddr.copyFromInAddr((struct in_addr *) (buf+4));
if (decode_clusteraddr != clusteraddr) return;
// Get source addr in packet, ensure it's the same as
// the sender.
IpAddress decode_src;
decode_src.copyFromInAddr((struct in_addr *) (buf+8));
if (decode_src != src) return;
unsigned int weight = ntohl(*(int *) (buf + 16));
// Ignore messages from my own node.
if (src == localaddr) return;
switch (cmd) {
case CommandStatus:
case CommandMaster:
// ok;
break;
default:
// unknown cmd
return;
}
// std::cout << "From " << src << " Command:" << cmd << " node weight:" << weight << std::endl;
// Check if it's already in nodemap.
if (nodes.find(src) == nodes.end())
{
nodes[src] = NodeInfo();
}
// Update weight and timestamp.
nodes[src].weight = weight;
if (! nodes[src].isup) {
nodes[src].isup = true;
std::cout << "Node up:" << src << std::endl;
}
// Timestamp
gettimeofday(& (nodes[src].lastheard), 0);
if (cmd == CommandMaster) {
decodeMasterPacket(buf,len,src);
}
}
// Handle messages for this resource.
UtlBoolean MprMixer::handleMessage(MpFlowGraphMsg& rMsg)
{
UtlBoolean boolRes;
int msgType;
int* weights;
msgType = rMsg.getMsg();
switch (msgType)
{
case SET_WEIGHT:
return handleSetWeight(rMsg.getInt1(), rMsg.getInt2());
break;
case SET_WEIGHTS:
weights = (int*) rMsg.getPtr1();
boolRes = handleSetWeights(weights, rMsg.getInt1());
delete[] weights; // delete storage allocated in the setWeights() method
return boolRes;
break;
default:
return MpResource::handleMessage(rMsg);
break;
}
}
