Page 706 - Nodejs 교과서 개정2판

ۈ׮о प೯ೡ JOEFY KTܳ ੘ࢿ೤פ׮

aws-upload/index.js

const AWS = require('aws-sdk');
const sharp = require('sharp');

const s3 = new AWS.S3();
➊
exports.handler = async (event, context, callback) => {
➋

const Bucket = event.Records[0].s3.bucket.name;
const Key = decodeURIComponent(event.Records[0].s3.object.key);
const filename = Key.split('/')[Key.split('/').length - 1];
const ext = Key.split('.')[Key.split('.').length - 1].toLowerCase();
const requiredFormat = ext === 'jpg' ? 'jpeg' : ext; // sharp에서는 jpg 대신 jpeg를 사용합니다.
console.log('name', filename, 'ext', ext);
➌
try {
const s3Object = await s3.getObject({ Bucket, Key }).promise(); // 버퍼로 가져오기
console.log('original', s3Object.Body.length);
➍

const resizedImage = await sharp(s3Object.Body) // 리사이징
.resize(200, 200, { fit: 'inside' })
.toFormat(requiredFormat)
.toBuffer();
➎
await s3.putObject({ // thumb 폴더에 저장
Bucket,
Key: `thumb/${filename}`,
Body: resizedImage,
}).promise();
console.log('put', resizedImage.length);
return callback(null, `thumb/${filename}`);
} catch (error) {
console.error(error);
return callback(error);
}
};

➊ handler ೣࣻо ۈ׮ ഐ୹ द प೯غח ೣࣻੑפ׮ ݒѐ߸ࣻ۽ event৬ context DBMMCBDL੉ ઱য૘פ׮ e

ventח ഐ୹ ࢚ടী ؀ೠ ੿ࠁо ׸ѹ ੓Ҋ contextח प೯غח ೣࣻ ജ҃ী ؀ೠ ੿ࠁо ׸ѹ ੓णפ׮ ૒

੽ console.logೞৈ যځೠ ੿ࠁٜ੉ ٜয ੓ח૑ ഛੋ೧ࠁח Ѫ੉ જणפ׮ callback਷ ೣࣻо ৮ܐغ঻