Load redis configuration from clowder when available

[avisiedo]

I have been playing to deploy it in the ephemeral environment (wip) and I suggest this ticket to read configurations provided by clowder operator.

When it is deployed with an openshift template using clowderapp resource, it injects into the pod a secret with several configurations; in this particular scenario, the redis configuration (host, port) are provided into a json file which is pointed out by ACG_CONFIG environment variable. Currently exists app-common-python to help to read this parameters.

at appservice/config.py it could be something like:

from app_common_python import LoadedConfig, isClowderEnabled

# https://github.com/RedHatInsights/app-common-python
if isClowderEnabled():
    REDIS_SERVICE_HOST = LoadedConfig.inMemoryDb.hostname
    REDIS_SERVICE_PORT = int(LoadedConfig.inMemoryDb.port)
else:
    REDIS_SERVICE_HOST = environ.get('REDIS_SERVICE_HOST', 'localhost')
    REDIS_SERVICE_PORT = int(environ.get('REDIS_SERVICE_PORT', '6379'))

and use it at appservice/multiplexor.py by addding the app-common-python package:

   REDIS = redis.asyncio.Redis(host=config.REDIS_SERVICE_HOST,
                               port=config.REDIS_SERVICE_PORT)

Finally at appservice/Containerfile I added the dependency.

RUN pip3 install redis starlette httpx websockets uvicorn app-common-python

Additional Information:

• I have tried to deploy with this: https://github.com/avisiedo/cockpit-ephemeral (wip)
• https://github.com/RedHatInsights/app-common-python
• https://pypi.org/project/app-common-python/