📝 Add docstrings to codex/refactor-_process-to-use-own-sqlalchemy-session

Docstrings generation was requested by @shayancoin.

* #90 (comment)

The following files were modified:

* `backend/api/routes_sync.py`
* `backend/api/security.py`
* `backend/tests/test_sync_routes_metrics.py`

Author: coderabbitai[bot]

backend/api/routes_sync.py

@@ -69,12 +69,17 @@ async def hygraph_webhook(
     db: Session = Depends(get_db),
 ) -> Dict[str, Any]:
     """
-    Webhook receiver:
-    - HMAC validated (dependency)
-    - Single size guard (2MB) already enforced by dependency; body/raw set on request.state
-    - DB dedup via SyncEvent(event_id, body_sha256 unique)
-    - 202 fast-ack with background processing (pull_all)
-    - Structured JSON log line and Prometheus counters
+    Handle a Hygraph webhook by recording the event, deduplicating, and scheduling a background full sync.
+    
+    Attempts to create a SyncEvent to deduplicate incoming webhooks; if the event is already recorded, returns a 200 response with {"ok": True, "dedup": True}. Parses the request body as JSON and, on success, enqueues a background task that runs a full pull (HygraphService.pull_all) using a dedicated DB session; the background task updates Prometheus counters and logs results. On enqueueing, returns a 202 response with {"ok": True, "accepted": True}.
+    
+    Returns:
+    	A JSONResponse indicating one of:
+    		- {"ok": True, "dedup": True} with status 200 when the event is a duplicate.
+    		- {"ok": True, "accepted": True} with status 202 when the event was accepted and background processing was scheduled.
+    
+    Raises:
+    	HTTPException: Raised with a BAD_REQUEST error envelope when the request body is not valid JSON.
     """
     start = time.perf_counter()
     raw = getattr(request.state, "raw_body", b"")
@@ -109,6 +114,13 @@ async def hygraph_webhook(
         raise HTTPException(status_code=400, detail=_error_envelope("BAD_REQUEST", "Invalid JSON payload"))
 
     async def _process(event_id_local: Optional[str], body_sha_local: str) -> None:
+        """
+        Perform the background Hygraph sync: pull all content, update Prometheus metrics, and log success or failure.
+        
+        Parameters:
+            event_id_local (Optional[str]): Optional sync event identifier used for logging and correlation.
+            body_sha_local (str): SHA-256 of the webhook body used for correlation in logs and metrics.
+        """
         t0 = time.perf_counter()
         session = SessionLocal()
         try:

backend/api/security.py

@@ -14,7 +14,15 @@
 
 
 def _load_expected_write_token(settings: Settings) -> str:
-    """Resolve the configured API write token from settings or environment."""
+    """
+    Resolve the API write token from the provided settings or the API_WRITE_TOKEN environment variable.
+    
+    Parameters:
+        settings (Settings): Configuration object that may contain an `api_write_token` attribute.
+    
+    Returns:
+        str: The resolved token with surrounding whitespace removed; an empty string if no token is configured.
+    """
 
     token = getattr(settings, "api_write_token", None)
     if isinstance(token, str) and token.strip():
@@ -113,4 +121,4 @@ async def validate_hygraph_request(
         raise HTTPException(status_code=HTTP_401_UNAUTHORIZED, detail="Invalid signature")
     request.state.raw_body = body
     request.state.body_sha256 = hashlib.sha256(body).hexdigest()
-    return True
+    return True

backend/tests/test_sync_routes_metrics.py

@@ -15,11 +15,23 @@
 
 def _sig(secret: str, body: bytes) -> str:
     # x-hygraph-signature uses sha256=<hex>
+    """
+    Compute an HMAC-SHA256 signature for a request body using the given secret.
+    
+    Returns:
+        A string in the form "sha256=<hex digest>" containing the lowercase hexadecimal HMAC-SHA256 of the body (the secret is encoded as UTF-8).
+    """
     return "sha256=" + hmac.new(secret.encode("utf-8"), body, hashlib.sha256).hexdigest()
 
 
 @pytest.fixture()
 def client():
+    """
+    Provide a TestClient configured for the application's FastAPI app for use in tests.
+    
+    Returns:
+        TestClient: A TestClient instance bound to the FastAPI app.
+    """
     return TestClient(app)
 
 
@@ -64,6 +76,16 @@ def test_webhook_background_uses_new_session(client, caplog, monkeypatch):
     calls: list[bool] = []
 
     async def fake_pull_all(db, page_size=None):
+        """
+        Simulate a Hygraph `pull_all` call for tests and record whether the provided DB session is active.
+        
+        Parameters:
+            db: Database session or connection; its `is_active` attribute is appended to the test `calls` list.
+            page_size (optional): Ignored; accepted for API compatibility.
+        
+        Returns:
+            dict: Counts for pulled entities with keys `materials`, `modules`, and `systems`, each set to 0.
+        """
         db.execute(text("SELECT 1"))
         calls.append(db.is_active)
         return {"materials": 0, "modules": 0, "systems": 0}
@@ -99,4 +121,4 @@ async def fake_pull_modules(db, page_size=None):
     )
     assert r.status_code == 200
     assert r.json()["ok"] is True
-    assert r.json()["data"]["processed"] == 5
+    assert r.json()["data"]["processed"] == 5