580 lines
11 KiB
Go
580 lines
11 KiB
Go
package bigcache
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import (
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"fmt"
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"sync"
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"testing"
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"time"
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"github.com/stretchr/testify/assert"
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)
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var sink []byte
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func TestParallel(t *testing.T) {
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t.Parallel()
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// given
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cache, _ := NewBigCache(DefaultConfig(5 * time.Second))
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value := []byte("value")
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var wg sync.WaitGroup
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wg.Add(3)
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keys := 1337
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// when
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go func() {
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defer wg.Done()
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for i := 0; i < keys; i++ {
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cache.Set(fmt.Sprintf("key%d", i), value)
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}
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}()
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go func() {
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defer wg.Done()
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for i := 0; i < keys; i++ {
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sink, _ = cache.Get(fmt.Sprintf("key%d", i))
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}
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}()
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go func() {
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defer wg.Done()
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for i := 0; i < keys; i++ {
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cache.Delete(fmt.Sprintf("key%d", i))
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}
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}()
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// then
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wg.Wait()
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}
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func TestWriteAndGetOnCache(t *testing.T) {
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t.Parallel()
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// given
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cache, _ := NewBigCache(DefaultConfig(5 * time.Second))
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value := []byte("value")
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// when
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cache.Set("key", value)
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cachedValue, err := cache.Get("key")
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// then
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assert.NoError(t, err)
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assert.Equal(t, value, cachedValue)
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}
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func TestConstructCacheWithDefaultHasher(t *testing.T) {
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t.Parallel()
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// given
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cache, _ := NewBigCache(Config{
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Shards: 16,
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LifeWindow: 5 * time.Second,
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MaxEntriesInWindow: 10,
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MaxEntrySize: 256,
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})
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assert.IsType(t, fnv64a{}, cache.hash)
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}
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func TestWillReturnErrorOnInvalidNumberOfPartitions(t *testing.T) {
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t.Parallel()
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// given
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cache, error := NewBigCache(Config{
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Shards: 18,
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LifeWindow: 5 * time.Second,
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MaxEntriesInWindow: 10,
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MaxEntrySize: 256,
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})
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assert.Nil(t, cache)
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assert.Error(t, error, "Shards number must be power of two")
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}
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func TestEntryNotFound(t *testing.T) {
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t.Parallel()
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// given
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cache, _ := NewBigCache(Config{
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Shards: 16,
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LifeWindow: 5 * time.Second,
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MaxEntriesInWindow: 10,
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MaxEntrySize: 256,
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})
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// when
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_, err := cache.Get("nonExistingKey")
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// then
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assert.EqualError(t, err, "Entry \"nonExistingKey\" not found")
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}
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func TestTimingEviction(t *testing.T) {
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t.Parallel()
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// given
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clock := mockedClock{value: 0}
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cache, _ := newBigCache(Config{
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Shards: 1,
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LifeWindow: time.Second,
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MaxEntriesInWindow: 1,
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MaxEntrySize: 256,
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}, &clock)
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// when
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cache.Set("key", []byte("value"))
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clock.set(5)
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cache.Set("key2", []byte("value2"))
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_, err := cache.Get("key")
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// then
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assert.EqualError(t, err, "Entry \"key\" not found")
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}
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func TestTimingEvictionShouldEvictOnlyFromUpdatedShard(t *testing.T) {
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t.Parallel()
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// given
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clock := mockedClock{value: 0}
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cache, _ := newBigCache(Config{
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Shards: 4,
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LifeWindow: time.Second,
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MaxEntriesInWindow: 1,
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MaxEntrySize: 256,
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}, &clock)
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// when
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cache.Set("key", []byte("value"))
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clock.set(5)
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cache.Set("key2", []byte("value 2"))
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value, err := cache.Get("key")
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// then
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assert.NoError(t, err, "Entry \"key\" not found")
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assert.Equal(t, []byte("value"), value)
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}
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func TestCleanShouldEvictAll(t *testing.T) {
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t.Parallel()
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// given
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cache, _ := NewBigCache(Config{
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Shards: 4,
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LifeWindow: time.Second,
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CleanWindow: time.Second,
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MaxEntriesInWindow: 1,
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MaxEntrySize: 256,
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})
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// when
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cache.Set("key", []byte("value"))
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<-time.After(3 * time.Second)
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value, err := cache.Get("key")
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// then
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assert.EqualError(t, err, "Entry \"key\" not found")
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assert.Equal(t, value, []byte(nil))
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}
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func TestOnRemoveCallback(t *testing.T) {
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t.Parallel()
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// given
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clock := mockedClock{value: 0}
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onRemoveInvoked := false
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onRemove := func(key string, entry []byte) {
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onRemoveInvoked = true
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assert.Equal(t, "key", key)
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assert.Equal(t, []byte("value"), entry)
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}
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cache, _ := newBigCache(Config{
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Shards: 1,
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LifeWindow: time.Second,
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MaxEntriesInWindow: 1,
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MaxEntrySize: 256,
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OnRemove: onRemove,
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}, &clock)
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// when
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cache.Set("key", []byte("value"))
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clock.set(5)
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cache.Set("key2", []byte("value2"))
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// then
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assert.True(t, onRemoveInvoked)
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}
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func TestCacheLen(t *testing.T) {
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t.Parallel()
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// given
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cache, _ := NewBigCache(Config{
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Shards: 8,
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LifeWindow: time.Second,
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MaxEntriesInWindow: 1,
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MaxEntrySize: 256,
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})
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keys := 1337
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// when
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for i := 0; i < keys; i++ {
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cache.Set(fmt.Sprintf("key%d", i), []byte("value"))
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}
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// then
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assert.Equal(t, keys, cache.Len())
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}
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func TestCacheStats(t *testing.T) {
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t.Parallel()
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// given
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cache, _ := NewBigCache(Config{
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Shards: 8,
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LifeWindow: time.Second,
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MaxEntriesInWindow: 1,
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MaxEntrySize: 256,
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})
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// when
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for i := 0; i < 100; i++ {
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cache.Set(fmt.Sprintf("key%d", i), []byte("value"))
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}
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for i := 0; i < 10; i++ {
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value, err := cache.Get(fmt.Sprintf("key%d", i))
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assert.Nil(t, err)
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assert.Equal(t, string(value), "value")
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}
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for i := 100; i < 110; i++ {
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_, err := cache.Get(fmt.Sprintf("key%d", i))
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assert.Error(t, err)
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}
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for i := 10; i < 20; i++ {
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err := cache.Delete(fmt.Sprintf("key%d", i))
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assert.Nil(t, err)
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}
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for i := 110; i < 120; i++ {
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err := cache.Delete(fmt.Sprintf("key%d", i))
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assert.Error(t, err)
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}
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// then
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stats := cache.Stats()
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assert.Equal(t, stats.Hits, int64(10))
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assert.Equal(t, stats.Misses, int64(10))
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assert.Equal(t, stats.DelHits, int64(10))
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assert.Equal(t, stats.DelMisses, int64(10))
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}
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func TestCacheDel(t *testing.T) {
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t.Parallel()
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// given
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cache, _ := NewBigCache(DefaultConfig(time.Second))
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// when
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err := cache.Delete("nonExistingKey")
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// then
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assert.Equal(t, err.Error(), "Entry \"nonExistingKey\" not found")
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// and when
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cache.Set("existingKey", nil)
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err = cache.Delete("existingKey")
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cachedValue, _ := cache.Get("existingKey")
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// then
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assert.Nil(t, err)
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assert.Len(t, cachedValue, 0)
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}
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func TestCacheReset(t *testing.T) {
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t.Parallel()
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// given
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cache, _ := NewBigCache(Config{
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Shards: 8,
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LifeWindow: time.Second,
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MaxEntriesInWindow: 1,
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MaxEntrySize: 256,
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})
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keys := 1337
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// when
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for i := 0; i < keys; i++ {
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cache.Set(fmt.Sprintf("key%d", i), []byte("value"))
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}
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// then
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assert.Equal(t, keys, cache.Len())
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// and when
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cache.Reset()
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// then
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assert.Equal(t, 0, cache.Len())
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// and when
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for i := 0; i < keys; i++ {
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cache.Set(fmt.Sprintf("key%d", i), []byte("value"))
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}
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// then
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assert.Equal(t, keys, cache.Len())
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}
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func TestIterateOnResetCache(t *testing.T) {
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t.Parallel()
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// given
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cache, _ := NewBigCache(Config{
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Shards: 8,
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LifeWindow: time.Second,
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MaxEntriesInWindow: 1,
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MaxEntrySize: 256,
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})
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keys := 1337
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// when
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for i := 0; i < keys; i++ {
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cache.Set(fmt.Sprintf("key%d", i), []byte("value"))
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}
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cache.Reset()
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// then
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iterator := cache.Iterator()
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assert.Equal(t, false, iterator.SetNext())
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}
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func TestGetOnResetCache(t *testing.T) {
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t.Parallel()
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// given
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cache, _ := NewBigCache(Config{
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Shards: 8,
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LifeWindow: time.Second,
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MaxEntriesInWindow: 1,
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MaxEntrySize: 256,
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})
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keys := 1337
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// when
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for i := 0; i < keys; i++ {
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cache.Set(fmt.Sprintf("key%d", i), []byte("value"))
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}
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cache.Reset()
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// then
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value, err := cache.Get("key1")
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assert.Equal(t, err.Error(), "Entry \"key1\" not found")
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assert.Equal(t, value, []byte(nil))
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}
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func TestEntryUpdate(t *testing.T) {
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t.Parallel()
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// given
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clock := mockedClock{value: 0}
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cache, _ := newBigCache(Config{
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Shards: 1,
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LifeWindow: 6 * time.Second,
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MaxEntriesInWindow: 1,
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MaxEntrySize: 256,
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}, &clock)
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// when
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cache.Set("key", []byte("value"))
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clock.set(5)
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cache.Set("key", []byte("value2"))
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clock.set(7)
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cache.Set("key2", []byte("value3"))
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cachedValue, _ := cache.Get("key")
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// then
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assert.Equal(t, []byte("value2"), cachedValue)
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}
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func TestOldestEntryDeletionWhenMaxCacheSizeIsReached(t *testing.T) {
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t.Parallel()
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// given
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cache, _ := NewBigCache(Config{
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Shards: 1,
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LifeWindow: 5 * time.Second,
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MaxEntriesInWindow: 1,
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MaxEntrySize: 1,
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HardMaxCacheSize: 1,
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})
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// when
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cache.Set("key1", blob('a', 1024*400))
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cache.Set("key2", blob('b', 1024*400))
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cache.Set("key3", blob('c', 1024*800))
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_, key1Err := cache.Get("key1")
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_, key2Err := cache.Get("key2")
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entry3, _ := cache.Get("key3")
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// then
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assert.EqualError(t, key1Err, "Entry \"key1\" not found")
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assert.EqualError(t, key2Err, "Entry \"key2\" not found")
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assert.Equal(t, blob('c', 1024*800), entry3)
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}
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func TestRetrievingEntryShouldCopy(t *testing.T) {
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t.Parallel()
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// given
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cache, _ := NewBigCache(Config{
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Shards: 1,
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LifeWindow: 5 * time.Second,
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MaxEntriesInWindow: 1,
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MaxEntrySize: 1,
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HardMaxCacheSize: 1,
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})
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cache.Set("key1", blob('a', 1024*400))
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value, key1Err := cache.Get("key1")
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// when
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// override queue
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cache.Set("key2", blob('b', 1024*400))
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cache.Set("key3", blob('c', 1024*400))
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cache.Set("key4", blob('d', 1024*400))
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cache.Set("key5", blob('d', 1024*400))
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// then
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assert.Nil(t, key1Err)
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assert.Equal(t, blob('a', 1024*400), value)
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}
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func TestEntryBiggerThanMaxShardSizeError(t *testing.T) {
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t.Parallel()
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// given
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cache, _ := NewBigCache(Config{
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Shards: 1,
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LifeWindow: 5 * time.Second,
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MaxEntriesInWindow: 1,
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MaxEntrySize: 1,
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HardMaxCacheSize: 1,
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})
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// when
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err := cache.Set("key1", blob('a', 1024*1025))
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// then
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assert.EqualError(t, err, "entry is bigger than max shard size")
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}
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func TestHashCollision(t *testing.T) {
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t.Parallel()
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ml := &mockedLogger{}
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// given
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cache, _ := NewBigCache(Config{
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Shards: 16,
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LifeWindow: 5 * time.Second,
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MaxEntriesInWindow: 10,
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MaxEntrySize: 256,
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Verbose: true,
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Hasher: hashStub(5),
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Logger: ml,
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})
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// when
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cache.Set("liquid", []byte("value"))
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cachedValue, err := cache.Get("liquid")
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// then
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assert.NoError(t, err)
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assert.Equal(t, []byte("value"), cachedValue)
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// when
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cache.Set("costarring", []byte("value 2"))
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cachedValue, err = cache.Get("costarring")
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// then
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assert.NoError(t, err)
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assert.Equal(t, []byte("value 2"), cachedValue)
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// when
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cachedValue, err = cache.Get("liquid")
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// then
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assert.Error(t, err)
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assert.Nil(t, cachedValue)
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assert.NotEqual(t, "", ml.lastFormat)
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assert.Equal(t, cache.Stats().Collisions, int64(1))
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}
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func TestNilValueCaching(t *testing.T) {
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t.Parallel()
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// given
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cache, _ := NewBigCache(Config{
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Shards: 1,
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LifeWindow: 5 * time.Second,
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MaxEntriesInWindow: 1,
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MaxEntrySize: 1,
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HardMaxCacheSize: 1,
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})
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// when
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cache.Set("Kierkegaard", []byte{})
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cachedValue, err := cache.Get("Kierkegaard")
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// then
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assert.NoError(t, err)
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assert.Equal(t, []byte{}, cachedValue)
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// when
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cache.Set("Sartre", nil)
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cachedValue, err = cache.Get("Sartre")
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// then
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assert.NoError(t, err)
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assert.Equal(t, []byte{}, cachedValue)
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// when
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cache.Set("Nietzsche", []byte(nil))
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cachedValue, err = cache.Get("Nietzsche")
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// then
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assert.NoError(t, err)
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assert.Equal(t, []byte{}, cachedValue)
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}
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type mockedLogger struct {
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lastFormat string
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lastArgs []interface{}
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}
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func (ml *mockedLogger) Printf(format string, v ...interface{}) {
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ml.lastFormat = format
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ml.lastArgs = v
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}
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type mockedClock struct {
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value int64
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}
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func (mc *mockedClock) epoch() int64 {
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return mc.value
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}
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func (mc *mockedClock) set(value int64) {
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mc.value = value
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}
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func blob(char byte, len int) []byte {
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b := make([]byte, len)
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for index := range b {
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b[index] = char
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}
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return b
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}
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