Feature / Separate namespace support

[maxekman]

Description

BEWARE: After this PR repos/event stores are created with their FULL DB NAME and not prefix only, as it was before. To keep the old default DB name set it to prefix + "_default" when creating repos/event stores.

Moves all namespace support to a separate package namespace. The package contains an event store and repo with namespace support that uses any underlying event store and repo as storage. The factory function provided in the New...() methods is used to create event stores/repos the first time a namespace is used.

eventStore := NewEventStore(func(ns string) (eh.EventStore, error) {
	s, err := mongodb.NewEventStore("mongodb://", ns)
	if err != nil {
		return nil, err
	}
	return s, nil
})

Affected Components

• Event Store
• Repo
• Context
• Errors with previous namespace support

Related Issues

Solution and Design

Steps to test and verify

[coveralls]

Coverage increased (+0.6%) to 69.279% when pulling a23bbc7 on maxekman:feature/separate-namespace-support into f3b6276 on looplab:main.