- uploads can be made directly to S3 to avoid load on your server (Using Presigned URL can provide temp access to users)
- Very high scalability
- Less dependencies installed on main server
template.yml is a CloudFormation template (SAM Template) which creates an S3 bucket and relevant Lambda Function and and permissions.
Actual resizing is performed via Python code and Pillow Library. PIP packages will need to be prepared, since Pillow packages has binaries, this should be performed on an Lambda compatible instance. see Lambda compiler Repo
When uploading images to the created S3 bucket, simply prefix the object key with _/.
Resizing options can be set in settings.yml
lamdba_contents: the contents of the actual lambda function
sam_build: AWS SAM needs to generate a temp template with AWS references substituted
Follow lambda logs
awslogs get /aws/lambda/s3-transform-2-TransformFunction-16CL269YV02MF --profile sam --watch
Upload image to S3
aws s3 cp ./wollongong.jpg s3://my-unique-bucket-name-298043/_/wollongong1.jpg --profile sam
Building PIP packages
ssh -i builder-instance.pem ec2-user@18.196.34.175
/usr/bin/pip-3.6 install --target=./pip-packages
tar -zcvf pip-packages.tar.gz pip-packages
scp -i builder-instance.pem ec2-user@18.196.34.175:/home/ec2-user/pip-packages.tar.gz .