// sendRPC sends one or more RPCs to replicas from the supplied
// storage.Replica slice. First, replicas which have gossipped
// addresses are corraled and then sent via rpc.Send, with requirement
// that one RPC to a server must succeed.
func (db *DistDB) sendRPC(replicas []storage.Replica, method string, args, replyChanI interface{}) error {
if len(replicas) == 0 {
return util.Errorf("%s: replicas set is empty", method)
}
// Build a map from replica address (if gossipped) to args struct
// with replica set in header.
argsMap := map[net.Addr]interface{}{}
for _, replica := range replicas {
addr, err := db.nodeIDToAddr(replica.NodeID)
if err != nil {
glog.V(1).Infof("node %d address is not gossipped", replica.NodeID)
continue
}
// Copy the args value and set the replica in the header.
argsVal := reflect.New(reflect.TypeOf(args).Elem())
reflect.Indirect(argsVal).Set(reflect.Indirect(reflect.ValueOf(args)))
reflect.Indirect(argsVal).FieldByName("Replica").Set(reflect.ValueOf(replica))
argsMap[addr] = argsVal.Interface()
}
if len(argsMap) == 0 {
return noNodeAddrsAvailErr{util.Errorf("%s: no replica node addresses available via gossip", method)}
}
rpcOpts := rpc.Options{
N: 1,
SendNextTimeout: defaultSendNextTimeout,
Timeout: defaultRPCTimeout,
}
return rpc.Send(argsMap, method, replyChanI, rpcOpts)
}
// sendRPC sends one or more RPCs to replicas from the supplied
// proto.Replica slice. First, replicas which have gossipped
// addresses are corraled and then sent via rpc.Send, with requirement
// that one RPC to a server must succeed.
func (kv *DistKV) sendRPC(desc *proto.RangeDescriptor, method string, args proto.Request, replyChan interface{}) error {
if len(desc.Replicas) == 0 {
return util.Errorf("%s: replicas set is empty", method)
}
// Build a map from replica address (if gossipped) to args struct
// with replica set in header.
argsMap := map[net.Addr]interface{}{}
for _, replica := range desc.Replicas {
addr, err := kv.nodeIDToAddr(replica.NodeID)
if err != nil {
log.V(1).Infof("node %d address is not gossipped", replica.NodeID)
continue
}
// Copy the args value and set the replica in the header.
argsVal := reflect.New(reflect.TypeOf(args).Elem())
reflect.Indirect(argsVal).Set(reflect.Indirect(reflect.ValueOf(args)))
reflect.Indirect(argsVal).FieldByName("Replica").Set(reflect.ValueOf(replica))
argsMap[addr] = argsVal.Interface()
}
if len(argsMap) == 0 {
return noNodeAddrsAvailError{}
}
rpcOpts := rpc.Options{
N: 1,
SendNextTimeout: defaultSendNextTimeout,
Timeout: defaultRPCTimeout,
}
return rpc.Send(argsMap, method, replyChan, rpcOpts, kv.gossip.TLSConfig())
}