Switch to locking package

The locking logic was added to its own package as it may need to be used
by other parts of the code.

Signed-off-by: Gabriel Adrian Samfira <gsamfira@cloudbasesolutions.com>

locking/locking.go

@@ -0,0 +1,46 @@
+package locking
+
+import (
+	"fmt"
+	"sync"
+)
+
+var locker Locker
+var lockerMux = sync.Mutex{}
+
+func TryLock(key string) (bool, error) {
+	if locker == nil {
+		return false, fmt.Errorf("no locker is registered")
+	}
+
+	return locker.TryLock(key), nil
+}
+func Unlock(key string, remove bool) error {
+	if locker == nil {
+		return fmt.Errorf("no locker is registered")
+	}
+
+	locker.Unlock(key, remove)
+	return nil
+}
+
+func Delete(key string) error {
+	if locker == nil {
+		return fmt.Errorf("no locker is registered")
+	}
+
+	locker.Delete(key)
+	return nil
+}
+
+func RegisterLocker(lock Locker) error {
+	lockerMux.Lock()
+	defer lockerMux.Unlock()
+
+	if locker != nil {
+		return fmt.Errorf("locker already registered")
+	}
+
+	locker = lock
+	return nil
+}