mirror of
https://github.com/k3s-io/kubernetes.git
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128 lines
2.8 KiB
Go
128 lines
2.8 KiB
Go
/*
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Copyright 2014 The Kubernetes Authors.
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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 flowcontrol
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import (
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"math"
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"sync"
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"testing"
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"time"
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)
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func TestBasicThrottle(t *testing.T) {
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r := NewTokenBucketRateLimiter(1, 3)
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for i := 0; i < 3; i++ {
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if !r.TryAccept() {
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t.Error("unexpected false accept")
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}
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}
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if r.TryAccept() {
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t.Error("unexpected true accept")
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}
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}
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func TestIncrementThrottle(t *testing.T) {
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r := NewTokenBucketRateLimiter(1, 1)
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if !r.TryAccept() {
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t.Error("unexpected false accept")
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}
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if r.TryAccept() {
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t.Error("unexpected true accept")
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}
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// Allow to refill
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time.Sleep(2 * time.Second)
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if !r.TryAccept() {
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t.Error("unexpected false accept")
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}
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}
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func TestThrottle(t *testing.T) {
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r := NewTokenBucketRateLimiter(10, 5)
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// Should consume 5 tokens immediately, then
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// the remaining 11 should take at least 1 second (0.1s each)
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expectedFinish := time.Now().Add(time.Second * 1)
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for i := 0; i < 16; i++ {
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r.Accept()
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}
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if time.Now().Before(expectedFinish) {
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t.Error("rate limit was not respected, finished too early")
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}
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}
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func TestRateLimiterSaturation(t *testing.T) {
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const e = 0.000001
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tests := []struct {
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capacity int
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take int
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expectedSaturation float64
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}{
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{1, 1, 1},
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{10, 3, 0.3},
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}
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for i, tt := range tests {
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rl := NewTokenBucketRateLimiter(1, tt.capacity)
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for i := 0; i < tt.take; i++ {
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rl.Accept()
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}
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if math.Abs(rl.Saturation()-tt.expectedSaturation) > e {
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t.Fatalf("#%d: Saturation rate difference isn't within tolerable range\n want=%f, get=%f",
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i, tt.expectedSaturation, rl.Saturation())
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}
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}
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}
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func TestAlwaysFake(t *testing.T) {
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rl := NewFakeAlwaysRateLimiter()
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if !rl.TryAccept() {
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t.Error("TryAccept in AlwaysFake should return true.")
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}
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// If this will block the test will timeout
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rl.Accept()
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}
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func TestNeverFake(t *testing.T) {
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rl := NewFakeNeverRateLimiter()
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if rl.TryAccept() {
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t.Error("TryAccept in NeverFake should return false.")
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}
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finished := false
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wg := sync.WaitGroup{}
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wg.Add(1)
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go func() {
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rl.Accept()
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finished = true
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wg.Done()
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}()
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// Wait some time to make sure it never finished.
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time.Sleep(time.Second)
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if finished {
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t.Error("Accept should block forever in NeverFake.")
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}
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rl.Stop()
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wg.Wait()
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if !finished {
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t.Error("Stop should make Accept unblock in NeverFake.")
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}
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}
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