First Aggregate (data/__init__.py)

app/data/__init__.py

@@ -3,19 +3,26 @@
 from ..services.location.jhu import JhuLocationService
 from ..services.location.nyt import NYTLocationService
 
-# Mapping of services to data-sources.
-DATA_SOURCES = {
-    "jhu": JhuLocationService(),
-    "csbs": CSBSLocationService(),
-    "nyt": NYTLocationService(),
-}
 
 
-def data_source(source):
+class Source:
+
+    def __init__(self, source):
+        # Mapping of services to data-sources.
+        self.__DATA_SOURCES_LIST = {
+            "jhu": JhuLocationService(),
+            "csbs": CSBSLocationService(),
+            "nyt": NYTLocationService(),
+        }
+
+    def all_data_source(self):
+        return self.__DATA_SOURCES_LIST
+
+    def single_data_source(self, source):
     """
     Retrieves the provided data-source service.
 
     :returns: The service.
     :rtype: LocationService
     """
-    return DATA_SOURCES.get(source.lower())
+    return self.__DATA_SOURCES_LIST.get(source.lower())

app/main.py

@@ -14,7 +14,7 @@
 from sentry_sdk.integrations.asgi import SentryAsgiMiddleware
 
 from .config import get_settings
-from .data import data_source
+from .data import Source
 from .routers import V1, V2
 from .utils.httputils import setup_client_session, teardown_client_session
 
@@ -46,6 +46,7 @@
 #######################
 
 # Scout APM
+
 if SETTINGS.scout_name:  # pragma: no cover
     LOGGER.info(f"Adding Scout APM middleware for `{SETTINGS.scout_name}`")
     APP.add_middleware(ScoutMiddleware)
@@ -67,14 +68,14 @@
 )
 APP.add_middleware(GZipMiddleware, minimum_size=1000)
 
-
+SOURCES = Source()
 @APP.middleware("http")
 async def add_datasource(request: Request, call_next):
     """
     Attach the data source to the request.state.
     """
     # Retrieve the datas ource from query param.
-    source = data_source(request.query_params.get("source", default="jhu"))
+    source = SOURCE.get_data_source(request.query_params.get("source", default="jhu"))
 
     # Abort with 404 if source cannot be found.
     if not source:

app/routers/v2.py

@@ -3,7 +3,7 @@
 
 from fastapi import APIRouter, HTTPException, Request
 
-from ..data import DATA_SOURCES
+from ..data import Source
 from ..models import LatestResponse, LocationResponse, LocationsResponse
 
 V2 = APIRouter()
@@ -101,10 +101,10 @@ async def get_location_by_id(
     location = await request.state.source.get(id)
     return {"location": location.serialize(timelines)}
 
-
+SOURCE = Source()
 @V2.get("/sources")
 async def sources():
     """
     Retrieves a list of data-sources that are availble to use.
     """
-    return {"sources": list(DATA_SOURCES.keys())}
+    return {"sources": list(SOURCE.all_data_source)}