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01Your Code

Code input

import time
from collections import defaultdict

class RateLimiter:
    """Token bucket rate limiter for API endpoints."""

def __init__(self, max_tokens: int, refill_rate: float):
        self.max_tokens = max_tokens
        self.refill_rate = refill_rate  # tokens per second
        self.buckets: dict[str, float] = defaultdict(lambda: max_tokens)
        self.last_refill: dict[str, float] = {}

def _refill(self, client_id: str) -> None:
        now = time.monotonic()
        last = self.last_refill.get(client_id, now)
        elapsed = now - last
        tokens_to_add = elapsed * self.refill_rate
        self.buckets[client_id] = min(
            self.max_tokens, self.buckets[client_id] + tokens_to_add
        )
        self.last_refill[client_id] = now

def allow_request(self, client_id: str) -> bool:
        self._refill(client_id)
        # Bug: should be >= 1, not > 0. This allows requests
        # when tokens are between 0 and 1, granting one extra.
        if self.buckets[client_id] > 0:
            self.buckets[client_id] -= 1
            return True
        return False

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Explain Your Code

01Your Code

How to Get the Most Out of ExplainThisCode

Include complete functions

Choose the right mode

Use keyboard shortcuts

Try the Refactor tab

Quick Start Guide

01Your Code

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GitHub Repository

How to Get the Most Out of ExplainThisCode

Include complete functions

Choose the right mode

Use keyboard shortcuts

Try the Refactor tab

Quick Start Guide

Upload Code File

GitHub Repository