ALPHA Release - v7 - Complete refactoring

[ccoeurderoy]

Release v7 - Alpha

Do not merge this on the master branch. Create an alpha git branch so it can create a pre-release

Description

This alpha release contains huge breaking changes!

BREAKING CHANGES

• The PubSubFactory.create method options have changed and do not rely on Google types
• listen and emit methods have been replaced by publish and subscribe
• Every option does not depend on Google
• @google/pubsub package is now an optional peer dependency. It needs to be installed manually.

Other changes:

• Change the test framework from avajs to jest.

Motivation and Context

The @algoan/pubsub has been created to be cloud agnostic. This factory's goal is to switch from one cloud to another with a simple parameter change.

However, this library became more and more specific to Google Cloud Pub/Sub, and it is now difficult to add more transports. Thus, I wanted to rewrite the lib, even though it is highly inspired by @google-cloud/pubsub package,. I also want it easy to use.

This alpha release is not finished. There are still missing features that I want to tackle:

• Dynamic types: if I choose Google Pub/Sub as transport, I want the getNativeClient() or the getOriginalMessage() methods to return Google types
• Add the Push and Pull methods to handle every subscription cases
• Add more tests to the exactly-once delivery
• Create a playground application letting us play with options

I've changed the test framework because the latest version of ava does not force exit child processes, and tests couldn't end properly. Thanks to the detectOpenHandles option of jest, I've discovered that this was due to the subscription connection with the emulator. Indeed, HTTP2 connections were still open, I just needed to close server connections.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

[g-ongenae]

Do not merge this on the master branch. Create an alpha git branch so it can create a pre-release

I created the branch alpha. You may change the base ref of your PR.