Move wisski instance code to separate package

internal/wisski/wisski.go

@@ -0,0 +1,60 @@
+// Package wisski provides WissKI
+package wisski
+
+import (
+	"github.com/FAU-CDI/wisski-distillery/internal/component"
+	"github.com/FAU-CDI/wisski-distillery/internal/component/meta"
+	"github.com/FAU-CDI/wisski-distillery/internal/component/snapshotslog"
+	"github.com/FAU-CDI/wisski-distillery/internal/component/sql"
+	"github.com/FAU-CDI/wisski-distillery/internal/component/triplestore"
+	"github.com/FAU-CDI/wisski-distillery/internal/models"
+)
+
+// WissKI represents a single WissKI Instance
+type WissKI struct {
+	models.Instance // whatever is stored inside the underlying instance
+
+	// Drupal credentials - not stored in the database
+	DrupalUsername string
+	DrupalPassword string
+
+	// references to components!
+	Core component.Core
+	Meta *meta.Meta
+	TS   *triplestore.Triplestore
+	SQL  *sql.SQL
+
+	SnapshotsLog *snapshotslog.SnapshotsLog
+}
+
+// Save saves this instance in the bookkeeping table
+func (wisski *WissKI) Save() error {
+	db, err := wisski.SQL.QueryTable(false, models.InstanceTable)
+	if err != nil {
+		return err
+	}
+
+	// it has never been created => we need to create it in the database
+	if wisski.Instance.Created.IsZero() {
+		return db.Create(&wisski.Instance).Error
+	}
+
+	// Update based on the primary key!
+	return db.Where("pk = ?", wisski.Instance.Pk).Updates(&wisski.Instance).Error
+}
+
+// Delete deletes this instance from the bookkeeping table
+func (wisski *WissKI) Delete() error {
+	db, err := wisski.SQL.QueryTable(false, models.InstanceTable)
+	if err != nil {
+		return err
+	}
+
+	// doesn't exist => nothing to delete
+	if wisski.Instance.Created.IsZero() {
+		return nil
+	}
+
+	// delete it directly
+	return db.Delete(&wisski.Instance).Error
+}