first commit

app/core/rate_limiter.py

@@ -0,0 +1,25 @@
+from __future__ import annotations
+
+import asyncio
+import time
+from collections import deque
+
+
+class RateLimiter:
+    def __init__(self, requests_per_second: float = 1.0) -> None:
+        self._min_interval = 1.0 / requests_per_second
+        self._timestamps: deque[float] = deque()
+        self._lock = asyncio.Lock()
+
+    async def acquire(self) -> None:
+        async with self._lock:
+            now = time.monotonic()
+            while self._timestamps and self._timestamps[0] <= now - self._min_interval:
+                self._timestamps.popleft()
+
+            if self._timestamps:
+                wait_time = self._timestamps[0] + self._min_interval - now
+                if wait_time > 0:
+                    await asyncio.sleep(wait_time)
+
+            self._timestamps.append(time.monotonic())