Supress stdout output from adapter

Author: lars-petter-hauge

backend/src/acidwatch_api/routes/models.py

@@ -1,8 +1,11 @@
 from __future__ import annotations
 
 import logging
+import os
+import sys
 from collections import defaultdict
-from typing import Annotated
+from contextlib import contextmanager
+from typing import Annotated, Generator
 from uuid import UUID, uuid4
 
 from fastapi import APIRouter, BackgroundTasks, HTTPException, Request
@@ -211,11 +214,26 @@ async def run_adapters(
         )
 
 
+@contextmanager
+def _suppress_stdout() -> Generator[None, None, None]:
+    sys.stdout.flush()
+    saved_fd = os.dup(1)
+    devnull = os.open(os.devnull, os.O_WRONLY)
+    try:
+        os.dup2(devnull, 1)
+        yield
+    finally:
+        os.dup2(saved_fd, 1)
+        os.close(saved_fd)
+        os.close(devnull)
+
+
 async def _run_adapter(
     sessionmaker: SessionMaker, adapter: BaseAdapter, model_input_id: UUID
 ) -> dict[str, int | float]:
     try:
-        result = await adapter.run()
+        with _suppress_stdout():
+            result = await adapter.run()
 
         phases: list[Phase]
         panels: list[AnyPanel] = []