Database updates (#144)

* start moving some database stuff around

* continue moving db stuff around

* more fiddling

* more updates

* and some more

* and yet more

* i broke SOMETHING but what, it's a mystery

* tidy up

* vendor ttlcache

* use ttlcache

* fix up some tests

* rename some stuff

* little reminder

* some more updates

vendor/github.com/ReneKroon/ttlcache/item.go

@@ -0,0 +1,46 @@
+package ttlcache
+
+import (
+	"time"
+)
+
+const (
+	// ItemNotExpire Will avoid the item being expired by TTL, but can still be exired by callback etc.
+	ItemNotExpire time.Duration = -1
+	// ItemExpireWithGlobalTTL will use the global TTL when set.
+	ItemExpireWithGlobalTTL time.Duration = 0
+)
+
+func newItem(key string, data interface{}, ttl time.Duration) *item {
+	item := &item{
+		data: data,
+		ttl:  ttl,
+		key:  key,
+	}
+	// since nobody is aware yet of this item, it's safe to touch without lock here
+	item.touch()
+	return item
+}
+
+type item struct {
+	key        string
+	data       interface{}
+	ttl        time.Duration
+	expireAt   time.Time
+	queueIndex int
+}
+
+// Reset the item expiration time
+func (item *item) touch() {
+	if item.ttl > 0 {
+		item.expireAt = time.Now().Add(item.ttl)
+	}
+}
+
+// Verify if the item is expired
+func (item *item) expired() bool {
+	if item.ttl <= 0 {
+		return false
+	}
+	return item.expireAt.Before(time.Now())
+}