omars44 / serviceregistry

Service Registry for python apps

serviceregistry

Service Registry for python apps

For instance during the lifecycle of the application you want 2 things:

1. store system variables
2. store service with certain initialization code and initialize them on boot of the application

let's look an example to understand this further..

installation

pip install serviceregistry

how to use

from serviceregistry.services import Container, Registry
import meerkat.configurations.app.settings

def create_container(app):
    container = Container()

    container.set(settings.Props.FALCON, app)
    return container


def boot(container):
    service_registry = Registry()

    for service in settings.services:
        service_registry.register(service)

    service_registry.boot(container)


container = create_container(create_app())
boot(container)

here we define the props enum as constants to a system vars

# settings.py
from serviceregistry.services import Props as BaseProps

services = [
    LoggingService(),
    EnvironmentService(),
]


class Props(BaseProps):
    DI_PROVIDER = 0
    FALCON = 1

    APP_URL = "APP_URL"

    MONGO_HOST = "MONGO_HOST"
    MONGO_PORT = "MONGO_PORT"
    MONGO_DB = "MONGO_DB"

and here is the environment service, which registers certain system variables from environment variables

import os

from serviceregistry.services import BootableService, Container


class EnvironmentService(BootableService):
    def boot(self, container: Container):
        from meerkat.configurations.app.settings import Props

        container.set(Props.APP_URL, os.environ.get(Props.APP_URL.value))

        container.set(Props.MONGO_HOST, os.environ.get(Props.MONGO_HOST.value))
        container.set(Props.MONGO_PORT, os.environ.get(Props.MONGO_PORT.value))
        container.set(Props.MONGO_DB, os.environ.get(Props.MONGO_DB.value))

Logging service

import logging as registry_logging

import sys
import serviceregistry.services


class LoggingService(serviceregistry.services.BootableService):
    def boot(self):
        registry_logging.basicConfig(
            format="%(asctime)s - %(name)s - %(levelname)s - %(message)s",
            level=registry_logging.DEBUG,
        )

        registry_logging.getLogger().addHandler(
            registry_logging.StreamHandler(sys.stdout)
        )