// BroadcastRPCRequest invokes serviceMethod at all members of the // destinationView with arg. It returns an error if it fails to receive // a response from a quorum of processes. func BroadcastRPCRequest(destinationView *view.View, serviceMethod string, arg interface{}) error { errorChan := make(chan error, destinationView.NumberOfMembers()) for _, process := range destinationView.GetMembers() { go func(process view.Process) { var discardResult struct{} errorChan <- SendRPCRequest(process, serviceMethod, arg, &discardResult) }(process) } failedTotal := 0 successTotal := 0 for { err := <-errorChan if err != nil { failedTotal++ if failedTotal > destinationView.NumberOfToleratedFaults() { log.Printf("WARN: BroadcastRPCRequest failed to send %v to a quorum\n", serviceMethod) return err } } else { successTotal++ if successTotal == destinationView.QuorumSize() { return nil } } } }