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69 lines
2.0 KiB
Go
69 lines
2.0 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors All rights reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package util
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import "github.com/juju/ratelimit"
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type RateLimiter interface {
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// CanAccept returns true if the rate is below the limit, false otherwise
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CanAccept() bool
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// Accept returns once a token becomes available.
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Accept()
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// Stop stops the rate limiter, subsequent calls to CanAccept will return false
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Stop()
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}
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type tickRateLimiter struct {
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limiter *ratelimit.Bucket
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}
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// NewTokenBucketRateLimiter creates a rate limiter which implements a token bucket approach.
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// The rate limiter allows bursts of up to 'burst' to exceed the QPS, while still maintaining a
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// smoothed qps rate of 'qps'.
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// The bucket is initially filled with 'burst' tokens, and refills at a rate of 'qps'.
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// The maximum number of tokens in the bucket is capped at 'burst'.
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func NewTokenBucketRateLimiter(qps float32, burst int) RateLimiter {
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limiter := ratelimit.NewBucketWithRate(float64(qps), int64(burst))
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return &tickRateLimiter{limiter}
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}
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type fakeRateLimiter struct{}
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func NewFakeRateLimiter() RateLimiter {
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return &fakeRateLimiter{}
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}
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func (t *tickRateLimiter) CanAccept() bool {
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return t.limiter.TakeAvailable(1) == 1
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}
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// Accept will block until a token becomes available
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func (t *tickRateLimiter) Accept() {
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t.limiter.Wait(1)
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}
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func (t *tickRateLimiter) Stop() {
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}
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func (t *fakeRateLimiter) CanAccept() bool {
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return true
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}
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func (t *fakeRateLimiter) Stop() {}
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func (t *fakeRateLimiter) Accept() {}
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