handler.py

import json
import io
import boto3
import ast
from urllib.request import urlopen
import time
from boto3.dynamodb.conditions import Key, Attr
from PIL import Image

s3_client=boto3.client('s3')
s3_res = boto3.resource('s3')
def lambda_handler(event, context):
    client = boto3.resource("dynamodb")
    tnlBuck = s3_res.Bucket('aivuthumbnail')
    for record in event['Records']:
        bucket=record['s3']['bucket']['name']
        ikey = record['s3']['object']['key']
        params = {'Bucket': bucket, 'Key': ikey}
        proj = ikey.split('_')[0]
        outlet = ikey.split('_')[1]
        parameter = ikey.split('_')[2]
        dat = ikey.split('_')[3]
        table = client.Table("telescopeImageReceipt")
        table.put_item(Item={'image':ikey,'project':proj,'outlet':outlet,'parameter':parameter,'date':dat})
        url = s3_client.generate_presigned_url(ClientMethod='get_object', Params=params)
        with urlopen(url) as conn:
            image = Image.open(conn)
            MAX_SIZE = (100, 100) 
            image.thumbnail(MAX_SIZE)
            img_bytes = io.BytesIO()
            image.save(img_bytes, format='JPEG')
            img_bytes.seek(0)
            tnl_bucket.Object(ikey).put(Body=img_bytes.read())