token_bucket_algorithm

This Dart package provides rate limiting by using an implementation of the token bucket algorithm.

Simple usage

final bucket = TokenBucket(
  size: 15,
  refillInterval: const Duration(seconds: 1),
  refillAmount: 10,
  storage: MemoryTokenBucketStorage(), // optionally change the way the state of the bucket is stored
);

if(bucket.consume()) {
  // Consumed 1 token successfully
}

if(bucket.consume(2)) {
  // Consumed 2 tokens successfully
}

If you want to store the tokens asynchronously in a custom storage, you can also use the AsyncTokenBucket.

final bucket = AsyncTokenBucket(
  size: 15,
  refillInterval: const Duration(seconds: 1),
  refillAmount: 10,
  storage: MyCustomAsyncTokenBucketStorage(),
);

if(await bucket.consume()) {
  // Consumed 1 token successfully
}