func (master *Master) Go(cookie string, userServiceMethod string, args interface{}, reply interface{}, done chan *rpc.Call) *rpc.Call {
serviceMethod := "User." + userServiceMethod
if slave, err := master.getStartedSlave(cookie); err != nil {
call := new(rpc.Call)
call.ServiceMethod = serviceMethod
call.Args = args
call.Reply = reply
if done == nil {
done = make(chan *rpc.Call, 10) // buffered.
} else {
// If caller passes done != nil, it must arrange that
// done has enough buffer for the number of simultaneous
// RPCs that will be using that channel. If the channel
// is totally unbuffered, it's best not to run at all.
if cap(done) == 0 {
log.Panic("rpc: done channel is unbuffered")
}
}
call.Done = done
call.Error = err
call.Done <- call
return call
} else {
return slave.conn.Go(serviceMethod, args, reply, done)
}
}
