feat(fetcher): add data fetcher

app/dependencies/fetcher.py

@@ -0,0 +1,29 @@
+from __future__ import annotations
+
+from app.config import settings
+from app.dependencies.database import get_redis
+from app.fetcher import Fetcher
+
+fetcher: Fetcher | None = None
+
+
+def get_fetcher() -> Fetcher:
+    global fetcher
+    if fetcher is None:
+        fetcher = Fetcher(
+            settings.FETCHER_CLIENT_ID,
+            settings.FETCHER_CLIENT_SECRET,
+            settings.FETCHER_SCOPES,
+            settings.FETCHER_CALLBACK_URL,
+        )
+        redis = get_redis()
+        if redis:
+            access_token = redis.get(f"fetcher:access_token:{fetcher.client_id}")
+            if access_token:
+                fetcher.access_token = str(access_token)
+            refresh_token = redis.get(f"fetcher:refresh_token:{fetcher.client_id}")
+            if refresh_token:
+                fetcher.refresh_token = str(refresh_token)
+            if not fetcher.access_token or not fetcher.refresh_token:
+                print("Login to initialize fetcher:", fetcher.authorize_url)
+    return fetcher