github.com/m3db/m3@v1.5.0/src/aggregator/rate/limiter_test.go (about)

     1  // Copyright (c) 2017 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
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     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package rate
    22  
    23  import (
    24  	"math"
    25  	"testing"
    26  	"time"
    27  
    28  	"github.com/stretchr/testify/require"
    29  
    30  	xtime "github.com/m3db/m3/src/x/time"
    31  )
    32  
    33  func xnow() xtime.UnixNano {
    34  	return xtime.ToUnixNano(time.Now().Truncate(time.Second))
    35  }
    36  
    37  func BenchmarkLimiter(b *testing.B) {
    38  	var (
    39  		allowedPerSecond int64 = 100
    40  		now                    = xnow()
    41  		limiter                = NewLimiter(allowedPerSecond)
    42  	)
    43  
    44  	b.RunParallel(func(pb *testing.PB) {
    45  		for pb.Next() {
    46  			var allowed bool
    47  			for i := int64(0); i <= allowedPerSecond+1; i++ {
    48  				allowed = limiter.IsAllowed(1, now)
    49  			}
    50  
    51  			if allowed {
    52  				b.Fatalf("expected limit to be hit")
    53  			}
    54  		}
    55  	})
    56  	require.Equal(b, allowedPerSecond, limiter.Limit())
    57  }
    58  
    59  func TestLimiterLimit(t *testing.T) {
    60  	var allowedPerSecond int64 = 10
    61  
    62  	limiter := NewLimiter(allowedPerSecond)
    63  	require.Equal(t, allowedPerSecond, limiter.Limit())
    64  }
    65  
    66  func TestLimiterIsAllowed(t *testing.T) {
    67  	var (
    68  		allowedPerSecond int64 = 10
    69  		now                    = xnow()
    70  	)
    71  
    72  	limiter := NewLimiter(allowedPerSecond)
    73  	require.True(t, limiter.IsAllowed(5, now))
    74  	for i := 0; i < 5; i++ {
    75  		now += xtime.UnixNano(100 * time.Millisecond)
    76  		require.True(t, limiter.IsAllowed(1, now))
    77  	}
    78  	require.False(t, limiter.IsAllowed(1, now))
    79  
    80  	// Advance time to the next second and confirm the quota is reset.
    81  	now += xtime.UnixNano(time.Second)
    82  	require.True(t, limiter.IsAllowed(5, now))
    83  }
    84  
    85  func TestLimiterUnlimited(t *testing.T) {
    86  	var (
    87  		unlimitedLimit int64 = 0
    88  		now                  = xnow()
    89  	)
    90  
    91  	limiter := NewLimiter(unlimitedLimit)
    92  	require.True(t, limiter.IsAllowed(math.MaxInt64, now))
    93  
    94  	limiter.Reset(1)
    95  	require.False(t, limiter.IsAllowed(2, now))
    96  }
    97  
    98  func TestLimiterReset(t *testing.T) {
    99  	var (
   100  		allowedPerSecond int64 = 10
   101  		now                    = xnow()
   102  	)
   103  
   104  	limiter := NewLimiter(allowedPerSecond)
   105  	require.False(t, limiter.IsAllowed(20, now))
   106  
   107  	// Resetting to a higher limit and confirm all requests are allowed.
   108  	limiter.Reset(20)
   109  	require.True(t, limiter.IsAllowed(20, now))
   110  }