import boto3
import os

def lambda_handler(event, context):

    host = os.environ['LOCALSTACK_HOSTNAME']

    s3 = boto3.resource('s3', endpoint_url=f'http://{host}:9000', region_name='us-east-1',
                        aws_secret_access_key='minio123', aws_access_key_id='minio')

    src_bucket_name = 'src-bucket'
    dest_bucket_name = 'dest-bucket'

    src_bucket = s3.create_bucket(Bucket=src_bucket_name)
    s3.create_bucket(Bucket=dest_bucket_name)

    s3.Object(src_bucket_name, 'file0.txt').put(Body='test data')

    for obj in src_bucket.objects.all():
        dest_key = obj.key
        s3.Object(dest_bucket_name, dest_key).copy_from(CopySource={'Bucket': obj.bucket_name,
                                                                    'Key': obj.key})
        print('copied: ' + dest_key)

    return {"statusCode": 200, "headers": {}}