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package catfile
import (
"fmt"
"testing"
"time"
"github.com/stretchr/testify/require"
)
func TestCacheAdd(t *testing.T) {
const maxLen = 3
bc := newCache(time.Hour, maxLen, defaultEvictionInterval)
key0 := testKey(0)
value0 := testValue()
bc.add(key0, value0)
requireCacheValid(t, bc)
key1 := testKey(1)
bc.add(key1, testValue())
requireCacheValid(t, bc)
key2 := testKey(2)
bc.add(key2, testValue())
requireCacheValid(t, bc)
// Because maxLen is 3, and key0 is oldest, we expect that adding key3
// will kick out key0.
key3 := testKey(3)
bc.add(key3, testValue())
requireCacheValid(t, bc)
require.Equal(t, maxLen, bc.len(), "length should be maxLen")
require.True(t, value0.isClosed(), "value0 should be closed")
require.Equal(t, []key{key1, key2, key3}, keys(bc))
}
func TestCacheAddTwice(t *testing.T) {
bc := newCache(time.Hour, 10, defaultEvictionInterval)
key0 := testKey(0)
value0 := testValue()
bc.add(key0, value0)
requireCacheValid(t, bc)
key1 := testKey(1)
bc.add(key1, testValue())
requireCacheValid(t, bc)
require.Equal(t, key0, bc.head().key, "key0 should be oldest key")
value2 := testValue()
bc.add(key0, value2)
requireCacheValid(t, bc)
require.Equal(t, key1, bc.head().key, "key1 should be oldest key")
require.Equal(t, value2, bc.head().value)
require.True(t, value0.isClosed(), "value0 should be closed")
}
func TestCacheCheckout(t *testing.T) {
bc := newCache(time.Hour, 10, defaultEvictionInterval)
key0 := testKey(0)
value0 := testValue()
bc.add(key0, value0)
v, ok := bc.checkout(key{sessionID: "foo"})
requireCacheValid(t, bc)
require.Nil(t, v, "expect nil value when key not found")
require.False(t, ok, "ok flag")
v, ok = bc.checkout(key0)
requireCacheValid(t, bc)
require.Equal(t, value0, v)
require.True(t, ok, "ok flag")
require.False(t, v.isClosed(), "value should not be closed after checkout")
v, ok = bc.checkout(key0)
require.False(t, ok, "ok flag after second checkout")
require.Nil(t, v, "value from second checkout")
}
func TestCacheEnforceTTL(t *testing.T) {
ttl := time.Hour
bc := newCache(ttl, 10, defaultEvictionInterval)
sleep := func() { time.Sleep(2 * time.Millisecond) }
key0 := testKey(0)
value0 := testValue()
bc.add(key0, value0)
sleep()
key1 := testKey(1)
value1 := testValue()
bc.add(key1, value1)
sleep()
cutoff := time.Now().Add(ttl)
sleep()
key2 := testKey(2)
bc.add(key2, testValue())
sleep()
key3 := testKey(3)
bc.add(key3, testValue())
sleep()
requireCacheValid(t, bc)
// We expect this cutoff to cause eviction of key0 and key1 but no other keys.
bc.enforceTTL(cutoff)
requireCacheValid(t, bc)
for i, v := range []*batch{value0, value1} {
require.True(t, v.isClosed(), "value %d %v should be closed", i, v)
}
require.Equal(t, []key{key2, key3}, keys(bc), "remaining keys after EnforceTTL")
bc.enforceTTL(cutoff)
requireCacheValid(t, bc)
require.Equal(t, []key{key2, key3}, keys(bc), "remaining keys after second EnforceTTL")
}
func TestAutoExpiry(t *testing.T) {
ttl := 5 * time.Millisecond
refresh := 1 * time.Millisecond
bc := newCache(ttl, 10, refresh)
key0 := testKey(0)
value0 := testValue()
bc.add(key0, value0)
requireCacheValid(t, bc)
require.Contains(t, keys(bc), key0, "key should still be in map")
require.False(t, value0.isClosed(), "value should not have been closed")
// Wait for the monitor goroutine to do its thing
for i := 0; i < 100; i++ {
if len(keys(bc)) == 0 {
break
}
time.Sleep(refresh)
}
require.Empty(t, keys(bc), "key should no longer be in map")
require.True(t, value0.isClosed(), "value should be closed after eviction")
}
func requireCacheValid(t *testing.T, bc *BatchCache) {
bc.Lock()
defer bc.Unlock()
for _, ent := range bc.entries {
v := ent.value
require.False(t, v.isClosed(), "values in cache should not be closed: %v %v", ent, v)
}
}
func testValue() *batch { return &batch{} }
func testKey(i int) key { return key{sessionID: fmt.Sprintf("key-%d", i)} }
func keys(bc *BatchCache) []key {
bc.Lock()
defer bc.Unlock()
var result []key
for _, ent := range bc.entries {
result = append(result, ent.key)
}
return result
}
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