Invalidate Cloudfront

lambda_invalidate_cdn.py

from __future__ import print_function
 
import boto3
import time
 
def lambda_handler(event, context):
    path = "/" + event["Records"][0]["s3"]["object"]["key"]
    bucket_name = event["Records"][0]["s3"]["bucket"]["name"]
   
    client = boto3.client('s3')
    tags = client.get_bucket_tagging(Bucket=bucket_name)
    for tag in tags["TagSet"]:
        if tag["Key"] == "distribution_id":
            distribution_id = tag["Value"]
            break
   
    client = boto3.client('cloudfront')
    invalidation = client.create_invalidation(DistributionId=distribution_id,
        InvalidationBatch={
            'Paths': {
                'Quantity': 1,
                'Items': [path]
        },
        'CallerReference': str(time.time())
    })

thanks! came from your post: https://medium.com/@yagonobre/automatically-invalidate-cloudfront-cache-for-site-hosted-on-s3-3c7818099868

this works only for the files that have changed right? I mean, not the whole bucket in order to keep up with the free 1,000 invalidations per month limit.