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rate_test.go
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package redis_rate_test
import (
"context"
"testing"
"time"
"github.com/go-redis/redis/v8"
"github.com/stretchr/testify/require"
"github.com/go-redis/redis_rate/v9"
)
func rateLimiter() *redis_rate.Limiter {
ring := redis.NewRing(&redis.RingOptions{
Addrs: map[string]string{"server0": ":6379"},
})
if err := ring.FlushDB(context.TODO()).Err(); err != nil {
panic(err)
}
return redis_rate.NewLimiter(ring)
}
func TestAllow(t *testing.T) {
ctx := context.Background()
l := rateLimiter()
limit := redis_rate.PerSecond(10)
require.Equal(t, limit.String(), "10 req/s (burst 10)")
require.False(t, limit.IsZero())
res, err := l.Allow(ctx, "test_id", limit)
require.Nil(t, err)
require.Equal(t, res.Allowed, 1)
require.Equal(t, res.Remaining, 9)
require.Equal(t, res.RetryAfter, time.Duration(-1))
require.InDelta(t, res.ResetAfter, 100*time.Millisecond, float64(10*time.Millisecond))
err = l.Reset(ctx, "test_id")
require.Nil(t, err)
res, err = l.Allow(ctx, "test_id", limit)
require.Nil(t, err)
require.Equal(t, res.Allowed, 1)
require.Equal(t, res.Remaining, 9)
require.Equal(t, res.RetryAfter, time.Duration(-1))
require.InDelta(t, res.ResetAfter, 100*time.Millisecond, float64(10*time.Millisecond))
res, err = l.AllowN(ctx, "test_id", limit, 2)
require.Nil(t, err)
require.Equal(t, res.Allowed, 2)
require.Equal(t, res.Remaining, 7)
require.Equal(t, res.RetryAfter, time.Duration(-1))
require.InDelta(t, res.ResetAfter, 300*time.Millisecond, float64(10*time.Millisecond))
res, err = l.AllowN(ctx, "test_id", limit, 7)
require.Nil(t, err)
require.Equal(t, res.Allowed, 7)
require.Equal(t, res.Remaining, 0)
require.Equal(t, res.RetryAfter, time.Duration(-1))
require.InDelta(t, res.ResetAfter, 999*time.Millisecond, float64(10*time.Millisecond))
res, err = l.AllowN(ctx, "test_id", limit, 1000)
require.Nil(t, err)
require.Equal(t, res.Allowed, 0)
require.Equal(t, res.Remaining, 0)
require.InDelta(t, res.RetryAfter, 99*time.Second, float64(time.Second))
require.InDelta(t, res.ResetAfter, 999*time.Millisecond, float64(10*time.Millisecond))
}
func TestAllowN_IncrementZero(t *testing.T) {
ctx := context.Background()
l := rateLimiter()
limit := redis_rate.PerSecond(10)
// Check for a row that's not there
res, err := l.AllowN(ctx, "test_id", limit, 0)
require.Nil(t, err)
require.Equal(t, res.Allowed, 0)
require.Equal(t, res.Remaining, 10)
require.Equal(t, res.RetryAfter, time.Duration(-1))
require.Equal(t, res.ResetAfter, time.Duration(0))
// Now increment it
res, err = l.Allow(ctx, "test_id", limit)
require.Nil(t, err)
require.Equal(t, res.Allowed, 1)
require.Equal(t, res.Remaining, 9)
require.Equal(t, res.RetryAfter, time.Duration(-1))
require.InDelta(t, res.ResetAfter, 100*time.Millisecond, float64(10*time.Millisecond))
// Peek again
res, err = l.AllowN(ctx, "test_id", limit, 0)
require.Nil(t, err)
require.Equal(t, res.Allowed, 0)
require.Equal(t, res.Remaining, 9)
require.Equal(t, res.RetryAfter, time.Duration(-1))
require.InDelta(t, res.ResetAfter, 100*time.Millisecond, float64(10*time.Millisecond))
}
func TestRetryAfter(t *testing.T) {
limit := redis_rate.Limit{
Rate: 1,
Period: time.Millisecond,
Burst: 1,
}
ctx := context.Background()
l := rateLimiter()
for i := 0; i < 1000; i++ {
res, err := l.Allow(ctx, "test_id", limit)
require.Nil(t, err)
if res.Allowed > 0 {
continue
}
require.LessOrEqual(t, int64(res.RetryAfter), int64(time.Millisecond))
}
}
func TestAllowAtMost(t *testing.T) {
ctx := context.Background()
l := rateLimiter()
limit := redis_rate.PerSecond(10)
res, err := l.Allow(ctx, "test_id", limit)
require.Nil(t, err)
require.Equal(t, res.Allowed, 1)
require.Equal(t, res.Remaining, 9)
require.Equal(t, res.RetryAfter, time.Duration(-1))
require.InDelta(t, res.ResetAfter, 100*time.Millisecond, float64(10*time.Millisecond))
res, err = l.AllowAtMost(ctx, "test_id", limit, 2)
require.Nil(t, err)
require.Equal(t, res.Allowed, 2)
require.Equal(t, res.Remaining, 7)
require.Equal(t, res.RetryAfter, time.Duration(-1))
require.InDelta(t, res.ResetAfter, 300*time.Millisecond, float64(10*time.Millisecond))
res, err = l.AllowN(ctx, "test_id", limit, 0)
require.Nil(t, err)
require.Equal(t, res.Allowed, 0)
require.Equal(t, res.Remaining, 7)
require.Equal(t, res.RetryAfter, time.Duration(-1))
require.InDelta(t, res.ResetAfter, 300*time.Millisecond, float64(10*time.Millisecond))
res, err = l.AllowAtMost(ctx, "test_id", limit, 10)
require.Nil(t, err)
require.Equal(t, res.Allowed, 7)
require.Equal(t, res.Remaining, 0)
require.Equal(t, res.RetryAfter, time.Duration(-1))
require.InDelta(t, res.ResetAfter, 999*time.Millisecond, float64(10*time.Millisecond))
res, err = l.AllowN(ctx, "test_id", limit, 0)
require.Nil(t, err)
require.Equal(t, res.Allowed, 0)
require.Equal(t, res.Remaining, 0)
require.Equal(t, res.RetryAfter, time.Duration(-1))
require.InDelta(t, res.ResetAfter, 999*time.Millisecond, float64(10*time.Millisecond))
res, err = l.AllowAtMost(ctx, "test_id", limit, 1000)
require.Nil(t, err)
require.Equal(t, res.Allowed, 0)
require.Equal(t, res.Remaining, 0)
require.InDelta(t, res.RetryAfter, 99*time.Millisecond, float64(10*time.Millisecond))
require.InDelta(t, res.ResetAfter, 999*time.Millisecond, float64(10*time.Millisecond))
res, err = l.AllowN(ctx, "test_id", limit, 1000)
require.Nil(t, err)
require.Equal(t, res.Allowed, 0)
require.Equal(t, res.Remaining, 0)
require.InDelta(t, res.RetryAfter, 99*time.Second, float64(time.Second))
require.InDelta(t, res.ResetAfter, 999*time.Millisecond, float64(10*time.Millisecond))
}
func TestAllowAtMost_IncrementZero(t *testing.T) {
ctx := context.Background()
l := rateLimiter()
limit := redis_rate.PerSecond(10)
// Check for a row that isn't there
res, err := l.AllowAtMost(ctx, "test_id", limit, 0)
require.Nil(t, err)
require.Equal(t, res.Allowed, 0)
require.Equal(t, res.Remaining, 10)
require.Equal(t, res.RetryAfter, time.Duration(-1))
require.Equal(t, res.ResetAfter, time.Duration(0))
// Now increment it
res, err = l.Allow(ctx, "test_id", limit)
require.Nil(t, err)
require.Equal(t, res.Allowed, 1)
require.Equal(t, res.Remaining, 9)
require.Equal(t, res.RetryAfter, time.Duration(-1))
require.InDelta(t, res.ResetAfter, 100*time.Millisecond, float64(10*time.Millisecond))
// Peek again
res, err = l.AllowAtMost(ctx, "test_id", limit, 0)
require.Nil(t, err)
require.Equal(t, res.Allowed, 0)
require.Equal(t, res.Remaining, 9)
require.Equal(t, res.RetryAfter, time.Duration(-1))
require.InDelta(t, res.ResetAfter, 100*time.Millisecond, float64(10*time.Millisecond))
}
func BenchmarkAllow(b *testing.B) {
ctx := context.Background()
l := rateLimiter()
limit := redis_rate.PerSecond(1e6)
b.ResetTimer()
b.RunParallel(func(pb *testing.PB) {
for pb.Next() {
res, err := l.Allow(ctx, "foo", limit)
if err != nil {
b.Fatal(err)
}
if res.Allowed == 0 {
panic("not reached")
}
}
})
}
func BenchmarkAllowAtMost(b *testing.B) {
ctx := context.Background()
l := rateLimiter()
limit := redis_rate.PerSecond(1e6)
b.ResetTimer()
b.RunParallel(func(pb *testing.PB) {
for pb.Next() {
res, err := l.AllowAtMost(ctx, "foo", limit, 1)
if err != nil {
b.Fatal(err)
}
if res.Allowed == 0 {
panic("not reached")
}
}
})
}