Add memory implementation for keyvalue store

Signed-off-by: kolaente <k@knt.li>

pkg/modules/keyvalue/keyvalue.go

@@ -0,0 +1,24 @@
+// Copyright 2020 Vikunja and contriubtors. All rights reserved.
+//
+// This file is part of Vikunja.
+//
+// Vikunja is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Vikunja is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Vikunja.  If not, see <https://www.gnu.org/licenses/>.
+
+package keyvalue
+
+type Storage interface {
+	Put(key string, value interface{}) (err error)
+	Get(key string) (value interface{}, err error)
+	Del(key string) (err error)
+}

pkg/modules/keyvalue/memory/memory.go

@@ -0,0 +1,45 @@
+// Copyright 2020 Vikunja and contriubtors. All rights reserved.
+//
+// This file is part of Vikunja.
+//
+// Vikunja is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// Vikunja is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with Vikunja.  If not, see <https://www.gnu.org/licenses/>.
+
+package memory
+
+import "sync"
+
+type Storage struct {
+	store map[string]interface{}
+	mutex sync.Mutex
+}
+
+func (s *Storage) Put(key string, value interface{}) (err error) {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+	s.store[key] = value
+	return nil
+}
+
+func (s *Storage) Get(key string) (value interface{}, err error) {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+	return s.store[key], nil
+}
+
+func (s *Storage) Del(key string) (err error) {
+	s.mutex.Lock()
+	defer s.mutex.Unlock()
+	delete(s.store, key)
+	return nil
+}