vuduongtp

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

vuduongtp

import (
	"crypto/sha256"
	"fmt"
)

// SHA256 hash message by SHA256
func SHA256(plaintext string) *string {
	data := []byte(plaintext)
	hash := sha256.Sum256(data)
	hashString := fmt.Sprintf("%x", hash[:])

vuduongtp

import (
	"regexp"
	"strings"
)

func ConvertAccented(text string) string {
	text = strings.ToLower(text)
	var RegexpA = `à|á|ạ|ã|ả|ă|ắ|ằ|ẳ|ẵ|ặ|â|ấ|ầ|ẩ|ẫ|ậ`
	var RegexpE = `è|ẻ|ẽ|é|ẹ|ê|ề|ể|ễ|ế|ệ`
	var RegexpI = `ì|ỉ|ĩ|í|ị`

vuduongtp

import (
	"crypto/md5"
	"encoding/hex"
)

func MD5Hash(text string) string {
	hash := md5.Sum([]byte(text))
	return hex.EncodeToString(hash[:])
}

vuduongtp

import (
	"encoding/json"
	"fmt"
	"reflect"
)

func PrettyPrint(i interface{}) {
	fmt.Printf("Type: %s\n", reflect.TypeOf(i))
	s, _ := json.MarshalIndent(i, "", "\t")
	fmt.Println(string(s))