digitized_image_trigger

Invokes AWS Elastic Container Service (ECS) tasks when objects are created in S3 buckets.

Getting Started

With git installed, pull down the source code and move into the newly created directory:

git clone https://github.com/RockefellerArchiveCenter/digitized_image_trigger.git
cd digitized_image_trigger

Usage

This repository is intended to be deployed as a Lambda script in AWS infrastructure.

Expected Message Format

The script is designed to consume messages from an AWS S3 Bucket or an AWS Simple Notifications Service (SNS) queue.

SNS messages are expected have the following attributes:

• format - the format of the package (audio or video)
• refid - the ArchivesSpace refid associated with the package
• service - the service which produced the message
• outcome - the outcome of the service (usually SUCCESS or FAILURE, but may also be COMPLETE)
• message - - a detailed message about the service outcome (optional)
• rights_ids - rights IDs associated with the package (optional)

Configured Actions

The script takes the following actions:

• S3 events:
  • PutObject events trigger the digitized_image_validation ECS task.
• SNS events:
  • from validation service:
    • messages with outcome SUCCESS scale up digitized_image_qc ECS service if necessary.
  • from qc service:
    • messages with outcome SUCCESS trigger the digitized_image_packaging ECS task.
    • messages with outcome COMPLETE scale down digitized_image_qc ECS service.

License

This code is released under the MIT License.

Contributing

This is an open source project and we welcome contributions! If you want to fix a bug, or have an idea of how to enhance the application, the process looks like this:

1. File an issue in this repository. This will provide a location to discuss proposed implementations of fixes or enhancements, and can then be tied to a subsequent pull request.
2. If you have an idea of how to fix the bug (or make the improvements), fork the repository and work in your own branch. When you are done, push the branch back to this repository and set up a pull request. Automated unit tests are run on all pull requests. Any new code should have unit test coverage, documentation (if necessary), and should conform to the Python PEP8 style guidelines.
3. After some back and forth between you and core committers (or individuals who have privileges to commit to the base branch of this repository), your code will probably be merged, perhaps with some minor changes.

This repository contains a configuration file for git pre-commit hooks which help ensure that code is linted before it is checked into version control. It is strongly recommended that you install these hooks locally by installing pre-commit and running pre-commit install.

Tests

New code should have unit tests. Tests can be run using tox.