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Making RateLimiter and FixedLimiter, so they can both work with LimitWriter

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This commit is contained in:
Philipp Heckel 2022-01-12 17:03:28 -05:00
parent f6b9ebb693
commit c76e55a1c8
7 changed files with 127 additions and 67 deletions

98
util/limit_test.go
View file

@ -2,34 +2,51 @@ package util
import (
"bytes"
"github.com/stretchr/testify/require"
"testing"
"time"
)
func TestLimiter_Add(t *testing.T) {
l := NewLimiter(10)
if err := l.Add(5); err != nil {
func TestFixedLimiter_Add(t *testing.T) {
l := NewFixedLimiter(10)
if err := l.Allow(5); err != nil {
t.Fatal(err)
}
if err := l.Add(5); err != nil {
if err := l.Allow(5); err != nil {
t.Fatal(err)
}
if err := l.Add(5); err != ErrLimitReached {
if err := l.Allow(5); err != ErrLimitReached {
t.Fatalf("expected ErrLimitReached, got %#v", err)
}
}
func TestLimiter_AddSet(t *testing.T) {
l := NewLimiter(10)
l.Add(5)
if l.Value() != 5 {
t.Fatalf("expected value to be %d, got %d", 5, l.Value())
func TestFixedLimiter_AddSub(t *testing.T) {
l := NewFixedLimiter(10)
l.Allow(5)
if l.value != 5 {
t.Fatalf("expected value to be %d, got %d", 5, l.value)
}
l.Set(7)
if l.Value() != 7 {
t.Fatalf("expected value to be %d, got %d", 7, l.Value())
l.Allow(-2)
if l.value != 3 {
t.Fatalf("expected value to be %d, got %d", 7, l.value)
}
}
func TestBytesLimiter_Add_Simple(t *testing.T) {
l := NewBytesLimiter(250*1024*1024, 24*time.Hour) // 250 MB per 24h
require.Nil(t, l.Allow(100*1024*1024))
require.Nil(t, l.Allow(100*1024*1024))
require.Equal(t, ErrLimitReached, l.Allow(300*1024*1024))
}
func TestBytesLimiter_Add_Wait(t *testing.T) {
l := NewBytesLimiter(250*1024*1024, 24*time.Hour) // 250 MB per 24h (~ 303 bytes per 100ms)
require.Nil(t, l.Allow(250*1024*1024))
require.Equal(t, ErrLimitReached, l.Allow(400))
time.Sleep(200 * time.Millisecond)
require.Nil(t, l.Allow(400))
}
func TestLimitWriter_WriteNoLimiter(t *testing.T) {
var buf bytes.Buffer
lw := NewLimitWriter(&buf)
@ -46,7 +63,7 @@ func TestLimitWriter_WriteNoLimiter(t *testing.T) {
func TestLimitWriter_WriteOneLimiter(t *testing.T) {
var buf bytes.Buffer
l := NewLimiter(10)
l := NewFixedLimiter(10)
lw := NewLimitWriter(&buf, l)
if _, err := lw.Write(make([]byte, 10)); err != nil {
t.Fatal(err)
@ -57,15 +74,15 @@ func TestLimitWriter_WriteOneLimiter(t *testing.T) {
if buf.Len() != 10 {
t.Fatalf("expected buffer length to be %d, got %d", 10, buf.Len())
}
if l.Value() != 10 {
t.Fatalf("expected limiter value to be %d, got %d", 10, l.Value())
if l.value != 10 {
t.Fatalf("expected limiter value to be %d, got %d", 10, l.value)
}
}
func TestLimitWriter_WriteTwoLimiters(t *testing.T) {
var buf bytes.Buffer
l1 := NewLimiter(11)
l2 := NewLimiter(9)
l1 := NewFixedLimiter(11)
l2 := NewFixedLimiter(9)
lw := NewLimitWriter(&buf, l1, l2)
if _, err := lw.Write(make([]byte, 8)); err != nil {
t.Fatal(err)
@ -76,10 +93,47 @@ func TestLimitWriter_WriteTwoLimiters(t *testing.T) {
if buf.Len() != 8 {
t.Fatalf("expected buffer length to be %d, got %d", 8, buf.Len())
}
if l1.Value() != 8 {
t.Fatalf("expected limiter 1 value to be %d, got %d", 8, l1.Value())
if l1.value != 8 {
t.Fatalf("expected limiter 1 value to be %d, got %d", 8, l1.value)
}
if l2.Value() != 8 {
t.Fatalf("expected limiter 2 value to be %d, got %d", 8, l2.Value())
if l2.value != 8 {
t.Fatalf("expected limiter 2 value to be %d, got %d", 8, l2.value)
}
}
func TestLimitWriter_WriteTwoDifferentLimiters(t *testing.T) {
var buf bytes.Buffer
l1 := NewFixedLimiter(32)
l2 := NewBytesLimiter(8, 200*time.Millisecond)
lw := NewLimitWriter(&buf, l1, l2)
_, err := lw.Write(make([]byte, 8))
require.Nil(t, err)
_, err = lw.Write(make([]byte, 4))
require.Equal(t, ErrLimitReached, err)
}
func TestLimitWriter_WriteTwoDifferentLimiters_Wait(t *testing.T) {
var buf bytes.Buffer
l1 := NewFixedLimiter(32)
l2 := NewBytesLimiter(8, 200*time.Millisecond)
lw := NewLimitWriter(&buf, l1, l2)
_, err := lw.Write(make([]byte, 8))
require.Nil(t, err)
time.Sleep(250 * time.Millisecond)
_, err = lw.Write(make([]byte, 8))
require.Nil(t, err)
_, err = lw.Write(make([]byte, 4))
require.Equal(t, ErrLimitReached, err)
}
func TestLimitWriter_WriteTwoDifferentLimiters_Wait_FixedLimiterFail(t *testing.T) {
var buf bytes.Buffer
l1 := NewFixedLimiter(11) // <<< This fails below
l2 := NewBytesLimiter(8, 200*time.Millisecond)
lw := NewLimitWriter(&buf, l1, l2)
_, err := lw.Write(make([]byte, 8))
require.Nil(t, err)
time.Sleep(250 * time.Millisecond)
_, err = lw.Write(make([]byte, 8)) // <<< FixedLimiter fails
require.Equal(t, ErrLimitReached, err)
}