🌤 BE TIL Day 6 0321

⬇️ Main Note
https://docs.google.com/document/d/19xINO8jcj_vMobces2Yf5BpyP-HbKUjjccS7BwBSUU0/edit

☁️ Async/Await

Two computers are requesting and responsing to each other to deliver the data.
But sometimes, the request isn't sent properly.
--> This is because the user requested to fetch the information even before the data is fully uploaded to the data base.
To solve this problem, here, we use async/await.

Asynchronization

• Operated while the other functions are getting executed
• It's like us using kakao-talk while downloading the game
  --> we don't wait for the game to download successfully.
  Synchronization
  
• The functions are executed one by one.
• After one function is being executed, then the user is now available to send and receive the request successfully.

Javascript is in async way.
--> Source code is executed line by line.
--> After a line of code is executed, the next code is being executed.

// ========== 동기형식 ==========
const data = axios.get(“https://koreanjson.comp/posts/1”)
console.log(data)	//promise

// ========== 비동기를 동기로 바꾸기 ==========
async function createBoard(){
	const data = await axios.get(“https://koreanjson.comp/posts/1”)

☁️ Deploy

.env --> file
process.env.변수명 --> how to import
Since .env files are for important data, we rarely git push to git hub with the source code.

// ========== API Create ==========
app.post('/tokens/phone', (req, res) => {
  // facade pattern makes the efficiency go higher
  const phone = req.body.phoneNumber

  const isValid = getPhoneNumber(phone)
    if (isValid){
        const myToken = getToken()
        sendTokenToSMS(phone, myToken)
        res.send("인증완료 " + myToken)
    }
})

// ========== API Structure ==========
export async function sendTokenToSMS (fff, ggg){
    // console.log(fff + " 번호로 인증번호 " + ggg + "를 전송합니다")

    const appKey = process.env.SMS_APP_KEY
    const XSecretKey = process.env.SMS.X_SECRET_KEY
    const sender = process.env.SNS_SENDER

    const result = await axios.post( `https://api-sms.cloud.toast.com/sms/v3.0/${appKey}/WNgOBwLIMMiRMbfw/sender/sms`,{  //endpoint
        // data
        body: `ㅎㅇㅎㅇ, 인증번호는 [${ggg}]임`,
        sendNo: sender,  // 보내는 사람
        recipientList:[
            // 받는 사람 (동시에 여러명에게 보낼 수 있기에 대괄호 안에 객체 형태로 넣어줌)
            {internationalRecipientNo: fff}
        ]
    },{
        headers: {
            //config - 설정파일
            "Content-Type": "application/json;charset-URF-8",
            "X-Secret-Key": XSecretKey
        }
    })
    console.log(result)
    console.log("전송 끝")
}