Version 2.0

[dzimine]

To keep up with new AWS Greengrass features, Greengo needs a better, more modular structure, and ~80% unit test coverage. Some smaller refactoring ideas piled up, too. Now it's time to do it. I am breaking it to modules, adding unit tests, while trying to make it simple.

Refactor goals:

1. Major: reduce code duplication, modularize for testability. Write tests at ~80% coverage.
2. Minor: introduce simple dependency management.

This PR/branch will stay until it reaches feature-parity with master.

Notes on new design:

• Entity is a base class for Greengrass entities - Group, Subscriptions, Lambdas, etc. It contains shared logic for pre- and post- create and remove. Soon it will implement basic dependency management, something like this:

  1. On create: if dependencies (parents) are not yet created, notify and exit.
  2. On remove: if dependent entities (children) are not yet removed, remove them first, then remove the entity (chop the whole branch). May be give an option of auto-remove.

• Concrete entities, like Group or Subscriptions, implement do_create and do_remove methods, as well as declare their upstream and downstream dependencies.

• state is responsible for managing the state.

• greengrass module implements CLI commands. Support 1) create/remove the whole shebang; 2) create/remove individual entities 3) go beyond Greengrass for convinient dev flow, like create/remove Lambda functions of topic rules.

[dzimine]

Match v1 checklist

Main functions:

• greengo create
  greengo create-group-version
• greengo create-lambdas
• greengo remove-lambdas
• greengo create-loggers
• greengo remove-loggers
• greengo create-resources
• greengo remove-resources
• greengo create-subscriptions
• greengo remove-subscriptions
• greengo deploy
• greengo group
• greengo remove
• greengo state
• greengo update-lambda

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Below the cutting line, aka lost & found (things I am not motivated to hold the release of V2 for...)

• greengo create-root-key
• greengo update
• greengo create-connectors
• greengo remove-connectors