func newRatioController(tm timetools.TimeProvider, rampUp time.Duration) *ratioController {
return &ratioController{
duration: rampUp,
tm: tm,
start: tm.UtcNow(),
}
}
// newTokenBucket crates a `tokenBucket` instance for the specified `Rate`.
func newTokenBucket(rate *rate, clock timetools.TimeProvider) *tokenBucket {
return &tokenBucket{
period: rate.period,
timePerToken: time.Duration(int64(rate.period) / rate.average),
burst: rate.burst,
clock: clock,
lastRefresh: clock.UtcNow(),
availableTokens: rate.burst,
}
}