982584 - Update middleware list of services to allow a default implementation

Status: RESOLVED INVALID

(Socorro Graveyard :: Middleware, defect)

Description

[[DEACTIVATED] Adrian Gaudebert]

We currently use the ``service_overrides`` option to set default implementations for our services. That feels wrong, and as Peter suggested, we should instead add a third element to our list of services to accept a default implementation value. 

The ``service_overrides`` option would be empty by default, and used only to override a service's implementation when needed (for example using elasticsearch for the Search service instead of the default postgres).

Comment 1

[Peter Bengtsson [:peterbe]]

Yay! 
It would basically be this:

# in middleware_app.py
for info in SERVICES_LIST:
    if len(info) == 3:
        path, class_, module = info
    else:
        path, class_ = info
        module = 'socorro.external.postgresql'

right?

Comment 2

[Peter Bengtsson [:peterbe]]

This is not a need any more. We've moved almost all services out of the middleware to direct implementation calls in the webapp.