import asyncio
import time


class RateLimiter:
    def __init__(self, max_per_second: float = 2):
        self.max_per_second = max_per_second
        self.min_interval = 1.0 / max_per_second
        self.last_request = 0
        self._lock = asyncio.Lock()

    async def acquire(self):
        async with self._lock:
            current = time.time()
            time_since_last = current - self.last_request

            if time_since_last < self.min_interval:
                wait_time = self.min_interval - time_since_last
                await asyncio.sleep(wait_time)

            self.last_request = time.time()