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cache_test.go
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cache_test.go
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package cache
import (
"fmt"
"sync"
"testing"
"time"
"github.com/stretchr/testify/assert"
)
func TestCacheNoPurge(t *testing.T) {
lc, err := NewCache()
assert.NoError(t, err)
lc.Set("key1", "val1", 0)
assert.Equal(t, 1, lc.Len())
v, ok := lc.Peek("key1")
assert.Equal(t, "val1", v)
assert.True(t, ok)
v, ok = lc.Peek("key2")
assert.Empty(t, v)
assert.False(t, ok)
assert.Equal(t, []string{"key1"}, lc.Keys())
}
func TestCacheWithDeleteExpired(t *testing.T) {
var evicted []string
lc, err := NewCache(
TTL(150*time.Millisecond),
OnEvicted(func(key string, value interface{}) { evicted = append(evicted, key, value.(string)) }),
)
assert.NoError(t, err)
lc.Set("key1", "val1", 0)
time.Sleep(100 * time.Millisecond) // not enough to expire
lc.DeleteExpired()
assert.Equal(t, 1, lc.Len())
v, ok := lc.Get("key1")
assert.Equal(t, "val1", v)
assert.True(t, ok)
time.Sleep(200 * time.Millisecond) // expire
lc.DeleteExpired()
v, ok = lc.Get("key1")
assert.False(t, ok)
assert.Nil(t, v)
assert.Equal(t, 0, lc.Len())
assert.Equal(t, []string{"key1", "val1"}, evicted)
// add new entry
lc.Set("key2", "val2", 0)
assert.Equal(t, 1, lc.Len())
// nothing deleted
lc.DeleteExpired()
assert.Equal(t, 1, lc.Len())
assert.Equal(t, []string{"key1", "val1"}, evicted)
// Purge, cache should be clean
lc.Purge()
assert.Equal(t, 0, lc.Len())
assert.Equal(t, []string{"key1", "val1", "key2", "val2"}, evicted)
}
func TestCacheWithPurgeEnforcedBySize(t *testing.T) {
lc, err := NewCache(MaxKeys(10), TTL(time.Hour))
assert.NoError(t, err)
for i := 0; i < 100; i++ {
i := i
lc.Set(fmt.Sprintf("key%d", i), fmt.Sprintf("val%d", i), 0)
v, ok := lc.Get(fmt.Sprintf("key%d", i))
assert.Equal(t, fmt.Sprintf("val%d", i), v)
assert.True(t, ok)
assert.True(t, lc.Len() < 20)
}
assert.Equal(t, 10, lc.Len())
}
func TestCacheConcurrency(t *testing.T) {
lc, err := NewCache()
assert.NoError(t, err)
wg := sync.WaitGroup{}
wg.Add(1000)
for i := 0; i < 1000; i++ {
go func(i int) {
lc.Set(fmt.Sprintf("key-%d", i/10), fmt.Sprintf("val-%d", i/10), 0)
wg.Done()
}(i)
}
wg.Wait()
assert.Equal(t, 100, lc.Len())
}
func TestCacheInvalidateAndEvict(t *testing.T) {
var evicted int
lc, err := NewCache(LRU(), OnEvicted(func(_ string, _ interface{}) { evicted++ }))
assert.NoError(t, err)
lc.Set("key1", "val1", 0)
lc.Set("key2", "val2", 0)
val, ok := lc.Get("key1")
assert.True(t, ok)
assert.Equal(t, "val1", val)
assert.Equal(t, 0, evicted)
lc.Invalidate("key1")
assert.Equal(t, 1, evicted)
val, ok = lc.Get("key1")
assert.Empty(t, val)
assert.False(t, ok)
val, ok = lc.Get("key2")
assert.True(t, ok)
assert.Equal(t, "val2", val)
lc.InvalidateFn(func(key string) bool {
return key == "key2"
})
assert.Equal(t, 2, evicted)
_, ok = lc.Get("key2")
assert.False(t, ok)
assert.Equal(t, 0, lc.Len())
}
func TestCacheBadOption(t *testing.T) {
lc, err := NewCache(func(lc *cacheImpl) error {
return fmt.Errorf("mock err")
})
assert.EqualError(t, err, "failed to set cache option: mock err")
assert.Nil(t, lc)
}
func TestCacheExpired(t *testing.T) {
lc, err := NewCache(TTL(time.Millisecond * 5))
assert.NoError(t, err)
lc.Set("key1", "val1", 0)
assert.Equal(t, 1, lc.Len())
v, ok := lc.Peek("key1")
assert.Equal(t, v, "val1")
assert.True(t, ok)
v, ok = lc.Get("key1")
assert.Equal(t, v, "val1")
assert.True(t, ok)
time.Sleep(time.Millisecond * 10) // wait for entry to expire
assert.Equal(t, 1, lc.Len()) // but not purged
v, ok = lc.Peek("key1")
assert.Empty(t, v)
assert.False(t, ok)
v, ok = lc.Get("key1")
assert.Empty(t, v)
assert.False(t, ok)
}
func TestCacheRemoveOldest(t *testing.T) {
lc, err := NewCache(LRU(), MaxKeys(2))
assert.NoError(t, err)
lc.Set("key1", "val1", 0)
assert.Equal(t, 1, lc.Len())
v, ok := lc.Get("key1")
assert.True(t, ok)
assert.Equal(t, "val1", v)
assert.Equal(t, []string{"key1"}, lc.Keys())
assert.Equal(t, 1, lc.Len())
lc.Set("key2", "val2", 0)
assert.Equal(t, []string{"key1", "key2"}, lc.Keys())
assert.Equal(t, 2, lc.Len())
lc.RemoveOldest()
assert.Equal(t, []string{"key2"}, lc.Keys())
assert.Equal(t, 1, lc.Len())
}
func ExampleCache() {
// make cache with short TTL and 3 max keys
cache, _ := NewCache(MaxKeys(3), TTL(time.Millisecond*10))
// set value under key1.
// with 0 ttl (last parameter) will use cache-wide setting instead (10ms).
cache.Set("key1", "val1", 0)
// get value under key1
r, ok := cache.Get("key1")
// check for OK value, because otherwise return would be nil and
// type conversion will panic
if ok {
rstr := r.(string) // convert cached value from interface{} to real type
fmt.Printf("value before expiration is found: %v, value: %v\n", ok, rstr)
}
time.Sleep(time.Millisecond * 11)
// get value under key1 after key expiration
r, ok = cache.Get("key1")
// don't convert to string as with ok == false value would be nil
fmt.Printf("value after expiration is found: %v, value: %v\n", ok, r)
// set value under key2, would evict old entry because it is already expired.
// ttl (last parameter) overrides cache-wide ttl.
cache.Set("key2", "val2", time.Minute*5)
fmt.Printf("%+v\n", cache)
// Output:
// value before expiration is found: true, value: val1
// value after expiration is found: false, value: <nil>
// Size: 1, Stats: {Hits:1 Misses:1 Added:2 Evicted:1} (50.0%)
}