agreg-server/server/app/dependencies.py

import os
from functools import lru_cache

from adapters.postgres import connect, PgDeviceRepository, PgReadingRepository
from adapters.postgres_query import PgReadingQueryRepository
from adapters.mqtt import PahoMqttBroker
from services.uplink_service import UplinkService
from services.consumption_service import ConsumptionService

MQTT_HOST = os.getenv("MQTT_HOST", "mosquitto")
MQTT_PORT = int(os.getenv("MQTT_PORT", 1883))
MQTT_TOPIC = os.getenv("MQTT_TOPIC", "application/+/device/+/event/up")
DB_URI = os.getenv("DATABASE_URI", "postgresql://simugaz:simugaz@db/simugaz")

@lru_cache
def get_conn():
    return connect(DB_URI)

## Repositories
def get_device_repo() -> PgDeviceRepository:
    return PgDeviceRepository(get_conn())

def get_reading_repo() -> PgReadingRepository:
    return PgReadingRepository(get_conn())

def get_query_repo() -> PgReadingQueryRepository:
    return PgReadingQueryRepository(get_conn())


## Services
def get_uplink_service() -> UplinkService:
    return UplinkService(get_device_repo(), get_reading_repo())

def get_consumption_service() -> ConsumptionService:
    return ConsumptionService(get_query_repo())


## Adapters
def get_mqtt_broker() -> PahoMqttBroker:
    return PahoMqttBroker(MQTT_HOST, MQTT_PORT, MQTT_TOPIC)