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cumulus-publish-cnm

This is the python code for the lambda cumulus-publish-cmn. It takes in a list of cnm's (Cloud Notification Mechanism) and publishes each one to the specified ingestion SNS (provider-input-sns)

Required input

This function is intended to be used as a cumulus task and this requires sns_endpoint from the task_config

"task_config": {
    "sns_endpoint": "{$.meta.ingest_workflow_sns}"
}

Build (as a zip to load to AWS Lambda)

This page contains some good info on the overall "building a zip with poetry that's compatible with AWS Lambda".

Auto build script

TL;DR

chmod u+x build.sh;
./build.sh;
chmod u-x build.sh;

to run the following commands in order and build the artifact.zip

Manual build

This command creates the dist/ folder:

poetry build

This command downloads the dependency files from the just created .whl file, along with the lambda_handler function in cumulus_publish_cnm/cumulus_publish_cnm.py, and places them in the package folder:

poetry run pip install --upgrade -t package dist/*.whl

Note that boto3 and moto are not being pulled in. I've specifically excluded them via having them as tool.poetry.dev-dependencies only (via the pyproject.toml file)

The last command used is:

cd package ; zip -r ../artifact.zip . -x '*.pyc'

Which zips and creates the artifact.zip file, containing all files found in package/ excluding .pyc files

Then upload artifact.zip to any location you plan to use it

  • Upload directly as a lambda with aws lambda update-function-code
  • Upload to your AWS S3 lambdas/ folder so that your Cumulus Terraform Build can use it

Testing

Run the poetry run pytest tests command; you should see a similar output:

platform darwin -- Python 3.8.9, pytest-7.0.1, pluggy-1.0.0
rootdir: /Users/hryeung/PycharmProjects/jpl/cumulus_publish_cnm
collected 3 items

tests/test_cumulus_publish_cnm.py ... [100%]

====== 3 passed in 0.99s ======