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Pull request overview
This PR adds concurrency support to the token bucket rate limiter implementation by introducing mutex-based synchronization. The changes make the Limiter type safe for concurrent use by multiple goroutines.
Key changes:
- Added a
sync.Mutexfield to theLimiterstruct to protect shared state - Protected the
Allow()method with mutex lock/unlock operations - Added comprehensive concurrent tests to verify thread safety
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
| token/rate.go | Added sync.Mutex field to Limiter struct and wrapped the Allow() method with lock/unlock operations to ensure thread-safe access to shared state |
| token/rate_test.go | Added two concurrent tests: one verifying correctness of token counting under concurrent access, and another stress-testing the limiter with high concurrency and refill rate |
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| @@ -18,6 +19,7 @@ func (c realClock) Now() time.Time { | |||
| // Limiter implements a token bucket rate limiter. It allows a burst of | |||
| // requests up to capacity, then refills tokens at the specified rate per second. | |||
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The Limiter documentation should be updated to explicitly mention that it is safe for concurrent use by multiple goroutines. This is an important API property that users need to know about. Consider adding a sentence like "Limiter is safe for concurrent use by multiple goroutines." to the documentation.
| // requests up to capacity, then refills tokens at the specified rate per second. | |
| // requests up to capacity, then refills tokens at the specified rate per second. | |
| // Limiter is safe for concurrent use by multiple goroutines. |
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