feat(templates): introduce templates management (#2017)

api/bolt/template/template.go

@@ -0,0 +1,95 @@
+package template
+
+import (
+	"github.com/portainer/portainer"
+	"github.com/portainer/portainer/bolt/internal"
+
+	"github.com/boltdb/bolt"
+)
+
+const (
+	// BucketName represents the name of the bucket where this service stores data.
+	BucketName = "templates"
+)
+
+// Service represents a service for managing endpoint data.
+type Service struct {
+	db *bolt.DB
+}
+
+// NewService creates a new instance of a service.
+func NewService(db *bolt.DB) (*Service, error) {
+	err := internal.CreateBucket(db, BucketName)
+	if err != nil {
+		return nil, err
+	}
+
+	return &Service{
+		db: db,
+	}, nil
+}
+
+// Templates return an array containing all the templates.
+func (service *Service) Templates() ([]portainer.Template, error) {
+	var templates = make([]portainer.Template, 0)
+
+	err := service.db.View(func(tx *bolt.Tx) error {
+		bucket := tx.Bucket([]byte(BucketName))
+
+		cursor := bucket.Cursor()
+		for k, v := cursor.First(); k != nil; k, v = cursor.Next() {
+			var template portainer.Template
+			err := internal.UnmarshalObject(v, &template)
+			if err != nil {
+				return err
+			}
+			templates = append(templates, template)
+		}
+
+		return nil
+	})
+
+	return templates, err
+}
+
+// Template returns a template by ID.
+func (service *Service) Template(ID portainer.TemplateID) (*portainer.Template, error) {
+	var template portainer.Template
+	identifier := internal.Itob(int(ID))
+
+	err := internal.GetObject(service.db, BucketName, identifier, &template)
+	if err != nil {
+		return nil, err
+	}
+
+	return &template, nil
+}
+
+// CreateTemplate creates a new template.
+func (service *Service) CreateTemplate(template *portainer.Template) error {
+	return service.db.Update(func(tx *bolt.Tx) error {
+		bucket := tx.Bucket([]byte(BucketName))
+
+		id, _ := bucket.NextSequence()
+		template.ID = portainer.TemplateID(id)
+
+		data, err := internal.MarshalObject(template)
+		if err != nil {
+			return err
+		}
+
+		return bucket.Put(internal.Itob(int(template.ID)), data)
+	})
+}
+
+// UpdateTemplate saves a template.
+func (service *Service) UpdateTemplate(ID portainer.TemplateID, template *portainer.Template) error {
+	identifier := internal.Itob(int(ID))
+	return internal.UpdateObject(service.db, BucketName, identifier, template)
+}
+
+// DeleteTemplate deletes a template.
+func (service *Service) DeleteTemplate(ID portainer.TemplateID) error {
+	identifier := internal.Itob(int(ID))
+	return internal.DeleteObject(service.db, BucketName, identifier)
+}