TokenBucket

AirLibrary::Downloader

Struct TokenBucket 

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struct TokenBucket {
    tokens: f64,
    capacity: f64,
    refill_rate: f64,
    last_refill: Instant,
}
Expand description

Token bucket for rate limiting

Implements the token bucket algorithm for bandwidth throttling:

  • Tokens represent bytes that can be downloaded
  • Tokens are replenished at a constant rate (bytes per second)
  • Downloads consume tokens from the bucket
  • If bucket is empty, download is throttled until tokens available

Fields§

§tokens: f64

Current number of tokens available (bytes)

§capacity: f64

Maximum capacity of the bucket (burst allowance)

§refill_rate: f64

Token refill rate (bytes per second)

§last_refill: Instant

Last time tokens were refilled

Implementations§

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impl TokenBucket

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fn new(bytes_per_sec: u64, capacity_factor: f64) -> Self

Create a new token bucket with specified capacity and refill rate

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fn refill(&mut self)

Refill tokens based on elapsed time

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fn try_consume(&mut self, bytes: u64) -> u64

Try to consume the specified number of tokens (bytes) Returns number of tokens actually consumed

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async fn consume(&mut self, bytes: u64) -> Result<()>

Wait until enough tokens are available, then consume them

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fn set_rate(&mut self, bytes_per_sec: u64)

Update the refill rate (bandwidth limit)

Trait Implementations§

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impl Debug for TokenBucket

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

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