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// Copyright 2015 The Vanadium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
// Fortune implements fortune.FortuneServerMethods.
type impl struct {
fortunes []string
random *rand.Rand
mutex sync.RWMutex
// newImpl returns a Fortune implementation that can be used to create a service.
func newImpl() fortune.FortuneServerMethods {
return &impl{
fortunes: []string{
"You will reach the heights of success.",
"Conquer your fears or they will conquer you.",
"Today is your lucky day!",
random: rand.New(rand.NewSource(99)),
// Get retrieves a random fortune from the fortunes array.
func (f *impl) Get(_ *context.T, _ rpc.ServerCall) (fortune string, err error) {
defer f.mutex.RUnlock()
length := len(f.fortunes)
index := f.random.Intn(length)
return f.fortunes[index], nil
// Add inserts a new fortune into the fortunes array.
func (f *impl) Add(_ *context.T, _ rpc.ServerCall, fortune string) error {
defer f.mutex.Unlock()
f.fortunes = append(f.fortunes, fortune)
return nil
// Has returns a boolean that states wether a fortune exists in the fortunes array.
func (f *impl) Has(_ *context.T, _ rpc.ServerCall, fortune string) (bool, error) {
defer f.mutex.RUnlock()
exists := contains(f.fortunes, fortune)
return exists, nil
func contains(fortunes []string, fortune string) bool {
for _, item := range fortunes {
if item == fortune {
return true
return false