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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
// Copyright (c) 2021 The Jaeger Authors.
// Copyright (c) 2017 Uber Technologies, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package utils
import (
"testing"
"time"
"github.com/stretchr/testify/assert"
)
func TestRateLimiter(t *testing.T) {
rl := NewRateLimiter(2.0, 2.0)
// stop time
ts := time.Now()
rl.lastTick = ts
rl.timeNow = func() time.Time {
return ts
}
assert.True(t, rl.CheckCredit(1.0))
assert.True(t, rl.CheckCredit(1.0))
assert.False(t, rl.CheckCredit(1.0))
// move time 250ms forward, not enough credits to pay for 1.0 item
rl.timeNow = func() time.Time {
return ts.Add(time.Second / 4)
}
assert.False(t, rl.CheckCredit(1.0))
// move time 500ms forward, now enough credits to pay for 1.0 item
rl.timeNow = func() time.Time {
return ts.Add(time.Second/4 + time.Second/2)
}
assert.True(t, rl.CheckCredit(1.0))
assert.False(t, rl.CheckCredit(1.0))
// move time 5s forward, enough to accumulate credits for 10 messages, but it should still be capped at 2
rl.lastTick = ts
rl.timeNow = func() time.Time {
return ts.Add(5 * time.Second)
}
assert.True(t, rl.CheckCredit(1.0))
assert.True(t, rl.CheckCredit(1.0))
assert.False(t, rl.CheckCredit(1.0))
assert.False(t, rl.CheckCredit(1.0))
assert.False(t, rl.CheckCredit(1.0))
}
func TestRateLimiterMaxBalance(t *testing.T) {
rl := NewRateLimiter(0.1, 1.0)
// stop time
ts := time.Now()
rl.lastTick = ts
rl.timeNow = func() time.Time {
return ts
}
assert.True(t, rl.CheckCredit(1.0), "on initialization, should have enough credits for 1 message")
// move time 20s forward, enough to accumulate credits for 2 messages, but it should still be capped at 1
rl.timeNow = func() time.Time {
return ts.Add(time.Second * 20)
}
assert.True(t, rl.CheckCredit(1.0))
assert.False(t, rl.CheckCredit(1.0))
}
func TestRateLimiterReconfigure(t *testing.T) {
rl := NewRateLimiter(1, 1.0)
assertBalance := func(expected float64) {
const delta = 0.0000001 // just some precision for comparing floats
assert.InDelta(t, expected, rl.balance, delta)
}
// stop time
ts := time.Now()
rl.lastTick = ts
rl.timeNow = func() time.Time {
return ts
}
assert.True(t, rl.CheckCredit(1.0), "first message must succeed")
assert.False(t, rl.CheckCredit(1.0), "second message must be rejected")
assertBalance(0.0)
// move half-second forward
rl.timeNow = func() time.Time {
return ts.Add(time.Second / 2)
}
rl.updateBalance()
assertBalance(0.5) // 50% of max
rl.Update(2, 4)
assertBalance(2) // 50% of max
assert.EqualValues(t, 2, rl.creditsPerSecond)
assert.EqualValues(t, 4, rl.maxBalance)
}
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