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🔥Token Bucket Rate Limiter (API Gateway)Medium
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MediumSystem Design•Acceptance: 54.2%

Token Bucket Rate Limiter (API Gateway)

Targeted in FAANG & Tech OA:UberSwiggyAmazonGoogle
Real-World Engineering Context
Deployed in Cloudflare WAF and Stripe API Gateways to prevent DDoS and API quota exhaustion.
Simulate an API Gateway Token Bucket rate limiter. Given `capacity`, `refillRate` (tokens per second), and an ascending list of arrival timestamps `timestamps` (seconds), return an array of booleans indicating if each request was accepted (`true`) or throttled (`false`). Bucket starts at full capacity.

Sample Test Cases

Input: [2,1,[0,0.1,0.2,1.5]]
Expected: [true,true,false,true]
Input: [1,0.5,[0,0.05]]
Expected: [true,false]

Constraints

  • 1 <= capacity <= 1000
  • 0.1 <= refillRate <= 100.0
  • timestamps are in non-decreasing order.
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