DB Migrations (#67)

pkg/db/db.go

@@ -0,0 +1,78 @@
+//  Vikunja is a todo-list application to facilitate your life.
+//  Copyright 2019 Vikunja and contributors. All rights reserved.
+//
+//  This program 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.
+//
+//  This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package db
+
+import (
+	"code.vikunja.io/api/pkg/config"
+	"code.vikunja.io/api/pkg/log"
+	"fmt"
+	"github.com/go-xorm/core"
+	"github.com/go-xorm/xorm"
+	"github.com/spf13/viper"
+
+	_ "github.com/go-sql-driver/mysql" // Because.
+	_ "github.com/mattn/go-sqlite3"    // Because.
+)
+
+// CreateDBEngine initializes a db engine from the config
+func CreateDBEngine() (engine *xorm.Engine, err error) {
+	// If the database type is not set, this likely means we need to initialize the config first
+	if viper.GetString("database.type") == "" {
+		config.InitConfig()
+	}
+
+	// Use Mysql if set
+	if viper.GetString("database.type") == "mysql" {
+		engine, err = initMysqlEngine()
+		if err != nil {
+			return
+		}
+	} else {
+		// Otherwise use sqlite
+		engine, err = initSqliteEngine()
+		if err != nil {
+			return
+		}
+	}
+
+	engine.SetMapper(core.GonicMapper{})
+	engine.ShowSQL(viper.GetString("log.database") != "off")
+	engine.SetLogger(xorm.NewSimpleLogger(log.GetLogWriter("database")))
+
+	return
+}
+
+func initMysqlEngine() (engine *xorm.Engine, err error) {
+	connStr := fmt.Sprintf(
+		"%s:%s@tcp(%s)/%s?charset=utf8&parseTime=true",
+		viper.GetString("database.user"),
+		viper.GetString("database.password"),
+		viper.GetString("database.host"),
+		viper.GetString("database.database"))
+	engine, err = xorm.NewEngine("mysql", connStr)
+	engine.SetMaxOpenConns(viper.GetInt("database.openconnections"))
+	return
+}
+
+func initSqliteEngine() (engine *xorm.Engine, err error) {
+	path := viper.GetString("database.path")
+	if path == "" {
+		path = "./db.db"
+	}
+
+	return xorm.NewEngine("sqlite3", path)
+}