Move wisski instance code to separate package

internal/component/instances/wisski_lock.go

@@ -1,47 +0,0 @@
-package instances
-
-import (
-	"errors"
-
-	"github.com/FAU-CDI/wisski-distillery/internal/models"
-)
-
-var ErrLocked = errors.New("instance is locked")
-
-// TryLock attemps to lock this WissKI
-// If this is not possible, returns ErrLocked
-func (wisski WissKI) TryLock() error {
-	table, err := wisski.instances.SQL.QueryTable(true, models.LockTable)
-	if err != nil {
-		return ErrLocked
-	}
-
-	result := table.FirstOrCreate(&models.Lock{}, models.Lock{Slug: wisski.Slug})
-	locked := result.Error == nil && result.RowsAffected == 1
-
-	if !locked {
-		return ErrLocked
-	}
-	return nil
-}
-
-func (wisski WissKI) IsLocked() (locked bool) {
-	table, err := wisski.instances.SQL.QueryTable(true, models.LockTable)
-	if err != nil {
-		return false
-	}
-
-	// check if this instance is locked
-	table.Select("count(*) > 0").Where("slug = ?", wisski.Slug).Find(&locked)
-	return
-}
-
-// Unlock unlocks this WissKI instance and returns if it succeeded
-func (wisski WissKI) Unlock() bool {
-	table, err := wisski.instances.SQL.QueryTable(true, models.LockTable)
-	if err != nil {
-		return false
-	}
-	result := table.Where("slug = ?", wisski.Slug).Delete(&models.Lock{})
-	return result.Error == nil && result.RowsAffected == 1
-}