WebsocketEvent::getRegion is incompatible with custom domain names.

[Shkeats]

Description:

Bref\Event\ApiGateway\WebsocketEvent has a method getRegion() that should return the current AWS region e.g. eu-west-1

This is implemented by parsing it out of the domainName from the event requestContext.

This makes sense only in the case that default AWS provided API gateway domains are used. When you set up your own domain for the websocket API you end up getting a segment of that domain returned as your region.

For example if you have a domain configured of websocket.example.org the AWS region returned by this method would be org which isn't correct.

Hope that makes sense, it's a fairly straightforward one but happy to provide more context if needed. I'm not sure if it's a good solution but the current region is available in Lambda via an environment variable.

The below resolves it for me:

[Shkeats]

PR added with this change #1594

[mnapoli]

Thanks for the PR!