AWS Lambda + S3 Trigger 이미지 자동 생성 실습

AWS Lambda은 서버를 프로비저닝하거나 관리하지 않고도 코드를 실행할 수 있게 해주는 컴퓨팅 서비스입니다. Lambda는 고가용성 컴퓨팅 인프라에서 코드를 실행하고 서버와 운영 체제 유지 관리, 용량 프로비저닝 및 자동 조정, 코드 및 보안 패치 배포, 로깅 등 모든 컴퓨팅 리소스 관리를 수행합니다. Lambda를 사용하면 Lambda가 지원하는 언어 런타임 중 하나로 코드를 제공하기만 하면 됩니다. Lambda 함수에 코드를 구성합니다. Lambda 서비스는 필요할 때만 함수를 실행하고 자동으로 확장됩니다. 사용한 컴퓨팅 시간만큼만 비용을 지불하고, 코드가 실행되지 않을 때는 요금이 부과되지 않습니다.

{ "Version": "2012-10-17", "Statement": [ // CloudWatch LogGroup, LogStream 생성 권한과 Log를 생성하는 권한을 부여함 { "Effect": "Allow", "Action": [ "logs:PutLogEvents", "logs:CreateLogGroup", "logs:CreateLogStream" ], "Resource": "arn:aws:logs:*:*:*" }, // 원하는 Bucket, Bucket 디렉토리를 조회할 수 있는 권한을 부여함 { "Sid": "ListObjectsInBucket", "Effect": "Allow", "Action": [ "s3:ListBucket" ], "Resource": [ "arn:aws:s3:::[YOUR-BUCKET-NAME]/[BUCKET-PATH]/*", "arn:aws:s3:::my-lambda-resources/*" ] }, // 원하는 Bucket, Bucket 내의 모든 Object 제어 권한을 부여함 { "Sid": "AllObjectActions", "Effect": "Allow", "Action": "s3:*Object", "Resource": [ "arn:aws:s3:::[YOUR-BUCKET-NAME]/[BUCKET-PATH]/*", "arn:aws:s3:::my-lambda-resources/*" ] } ] }

. ├── NotoSansKR-Bold.ttf ├── NotoSansKR-Medium.ttf ├── NotoSansKR-Regular.ttf ├── give_me_more.png ├── pil_transparency_test.py └── result_give_me_more.png

from PIL import Image, ImageDraw, ImageFont def insert_text_center(image, message, font, font_color=(255, 255, 255)): # Noto Sans KR W, H = image.size draw = ImageDraw.Draw(image, "RGBA") x, y, w, h = draw.textbbox((0, 0), message, font=font) draw.text(((W-w)/2, (H-h)/2), message, font=font, fill=font_color) return image def insert_transparency_rectangle(image, color=(0, 0, 0), transparency=0.70): # Transparency : 70% opacity = int(255 * transparency) overlay = Image.new("RGBA", image.size, color + (0, )) draw = ImageDraw.Draw(overlay) draw.rectangle(((0, 0), image.size), fill=color + (opacity, )) image = image.convert('RGBA') image = Image.alpha_composite(image, overlay) return image filename = "give_me_more.png" target_image = Image.open(filename) target_text = "그렇게 꿀꿀이가 되고...." target_font = ImageFont.truetype("NotoSansKR-Bold.ttf", 80) target_image = insert_transparency_rectangle(image=target_image) target_image = insert_text_center(image=target_image, message=target_text, font=target_font) target_image.save(f"result_{filename}")

import os import io import json import boto3 import urllib.parse from PIL import Image, ImageDraw, ImageFont def insert_text_center(image, message, font, font_color=(255, 255, 255)): # Noto Sans KR W, H = image.size draw = ImageDraw.Draw(image, "RGBA") x, y, w, h = draw.textbbox((0, 0), message, font=font) draw.text(((W - w) / 2, (H - h) / 2), message, font=font, fill=font_color) return image def insert_transparency_rectangle(image, color=(0, 0, 0), transparency=0.70): # Transparency : 70% opacity = int(255 * transparency) overlay = Image.new("RGBA", image.size, color + (0,)) draw = ImageDraw.Draw(overlay) draw.rectangle(((0, 0), image.size), fill=color + (opacity,)) image = image.convert('RGBA') image = Image.alpha_composite(image, overlay) return image def lambda_handler(event, context): # Lambda resource bucket resource_bucket = "my-lambda-resources" # Actual handling bucket : [YOUR BUCKET] handle_bucket_name = event['Records'][0]['s3']['bucket']['name'] # handle_key : Filename and directory. handle_key = urllib.parse.unquote_plus(event['Records'][0]['s3']['object']['key'], encoding="utf-8") # Defense logic loop. if "result" in handle_key: return { 'statusCode': 400, 'body': json.dumps('File name has `result`.') } # Separate filename and directory. handle_filename = os.path.basename(handle_key) _, handle_extension = os.path.splitext(handle_filename) handle_directory = os.path.dirname(handle_key) # Set `S3` client s3 = boto3.resource( "s3", region_name="ap-northeast-2", aws_access_key_id="[ACCESS-KEY]", aws_secret_access_key="[SECRET-KEY]", ) # Set S3 bucket object. handle_bucket = s3.Bucket(handle_bucket_name) resource_bucket = s3.Bucket(resource_bucket) # Get file object from handling bucket. handle_object = handle_bucket.Object(handle_key).get()['Body'] # Get font file object from handling bucket. font_object = resource_bucket.Object("static/NotoSansKR-Bold.ttf").get()['Body'] # File control logic. target_image = Image.open(handle_object) target_text = "그렇게 꿀꿀이가 되고...." target_font = ImageFont.truetype(font=font_object, size=80) # Set image transparency and text. target_image = insert_transparency_rectangle(image=target_image) target_image = insert_text_center(image=target_image, message=target_text, font=target_font) target_image_buffer = io.BytesIO() # Save as `png` into Byte buffer. target_image.save(target_image_buffer, "png") # Set buffer pointer to the beginning. target_image_buffer.seek(0) # Upload into your handling bucket. handle_bucket.upload_fileobj( target_image_buffer, os.path.join(handle_directory, f"result_{handle_filename}") ) return { 'statusCode': 200, 'body': json.dumps('Hello from Lambda!') }