feature(utils): a hopefully reusable waitloop

selfprivacy_api/utils/waitloop.py

@@ -0,0 +1,15 @@
+from time import sleep
+from typing import Callable
+from typing import Optional
+
+def wait_until_true(readiness_checker: Callable[[],bool],*,interval: float =0.1, timeout_sec: Optional[float] = None):
+    elapsed = 0.0
+    if timeout_sec is None:
+        timeout_sec = 10e16
+    while not readiness_checker or elapsed > timeout_sec:
+        sleep(interval)
+        elapsed += interval
+    if elapsed > timeout_sec:
+        raise TimeoutError()
+
+