move cache to sync package

rollback indexer map
use sync.pool for cache entries
add tests for cache
remove main locks from nrwmutex and use sync.map and sync.pool instead
bump dockerfile go version

ocis-pkg/sync/cache_test.go

@@ -0,0 +1,54 @@
+package sync
+
+import (
+	"github.com/stretchr/testify/assert"
+	"strconv"
+	"testing"
+	"time"
+)
+
+func TestCache_Get(t *testing.T) {
+	size := 1024
+	c := NewCache(size)
+
+	for i := 0; i < size; i++ {
+		c.Set(strconv.Itoa(i), i, time.Now().Add(10*time.Second))
+	}
+
+	for i := 0; i < size; i++ {
+		assert.Equal(t, i, c.Get(strconv.Itoa(i)).V, "entry value is the same")
+	}
+
+	assert.Nil(t, c.Get("unknown"), "entry is nil if unknown")
+
+	wait := 10 * time.Millisecond
+	c.Set("expired", size, time.Now().Add(wait))
+	time.Sleep(wait + 1)
+	assert.Nil(t, c.Get(strconv.Itoa(size)), "entry is nil if it's expired")
+}
+
+func TestCache_Set(t *testing.T) {
+	c := NewCache(1)
+
+	c.Set("new", "new", time.Now().Add(10*time.Millisecond))
+	assert.Equal(t, "new", c.Get("new").V, "new entries can be added")
+	assert.Equal(t, 1, c.length, "adding new entries will increase the cache size")
+
+	replacedExpiration := time.Now().Add(10 * time.Millisecond)
+	c.Set("new", "updated", replacedExpiration)
+	assert.Equal(t, "updated", c.Get("new").V, "entry values can be updated")
+	assert.Equal(t, replacedExpiration, c.Get("new").expiration, "entry expiration can be updated")
+
+	time.Sleep(11 * time.Millisecond)
+	c.Set("eviction", "eviction", time.Now())
+	assert.Equal(t, 1, c.length, "expired entries get removed")
+}
+
+func TestCache_Unset(t *testing.T) {
+	c := NewCache(1)
+
+	c.Set("new", "new", time.Now().Add(10*time.Millisecond))
+	c.Unset("new")
+	assert.Nil(t, c.Get("new"), "entries can be removed")
+	assert.Equal(t, 0, c.length, "removing a entry decreases the cache size")
+}