Move WissKI Parts to new ingredients system

internal/wisski/ingredient/locker/lock.go

@@ -0,0 +1,44 @@
+package locker
+
+import (
+	"github.com/FAU-CDI/wisski-distillery/internal/models"
+	"github.com/FAU-CDI/wisski-distillery/internal/wisski/ingredient"
+	"github.com/tkw1536/goprogram/exit"
+)
+
+// Locker provides facitilites for locking this WissKI instance
+type Locker struct {
+	ingredient.Base
+}
+
+var Locked = exit.Error{
+	Message:  "WissKI Instance is locked for administrative operations",
+	ExitCode: exit.ExitGeneric,
+}
+
+// TryLock attemps to lock this WissKI and returns if it suceeded
+func (lock *Locker) TryLock() bool {
+	table, err := lock.Malt.SQL.QueryTable(true, models.LockTable)
+	if err != nil {
+		return false
+	}
+
+	result := table.FirstOrCreate(&models.Lock{}, models.Lock{Slug: lock.Slug})
+	return result.Error == nil && result.RowsAffected == 1
+}
+
+// TryUnlock attempts to unlock this WissKI and reports if it succeeded.
+// An unlock can only
+func (lock *Locker) TryUnlock() bool {
+	table, err := lock.Malt.SQL.QueryTable(true, models.LockTable)
+	if err != nil {
+		return false
+	}
+	result := table.Where("slug = ?", lock.Slug).Delete(&models.Lock{})
+	return result.Error == nil && result.RowsAffected == 1
+}
+
+// Unlock unlocks this WissKI, ignoring any error.
+func (lock *Locker) Unlock() {
+	lock.TryUnlock()
+}

internal/wisski/ingredient/locker/locked.go

@@ -0,0 +1,15 @@
+package locker
+
+import "github.com/FAU-CDI/wisski-distillery/internal/models"
+
+// Locked checks if this WissKI is currently locked.
+func (lock *Locker) Locked() (locked bool) {
+	table, err := lock.SQL.QueryTable(true, models.LockTable)
+	if err != nil {
+		return false
+	}
+
+	// check if this instance is locked
+	table.Select("count(*) > 0").Where("slug = ?", lock.Slug).Find(&locked)
+	return
+}