added adding and editing of availabilities

backend/pkg/db/db.go

@@ -1,11 +1,13 @@
 package db
 
 import (
-	"time"
+	"database/sql"
+	"fmt"
+	"os"
 
-	"github.com/go-sql-driver/mysql"
 	"github.com/jmoiron/sqlx"
 	_config "github.com/johannesbuehl/golunteer/backend/pkg/config"
+	_ "modernc.org/sqlite" // SQLite driver
 )
 
 var config = _config.Config
@@ -14,20 +16,31 @@ var config = _config.Config
 var DB *sqlx.DB
 
 func init() {
-	// setup the database-connection
-	sqlConfig := mysql.Config{
-		AllowNativePasswords: true,
-		Net:                  "tcp",
-		User:                 config.Database.User,
-		Passwd:               config.Database.Password,
-		Addr:                 config.Database.Host,
-		DBName:               config.Database.Database,
-	}
-
 	// connect to the database
-	DB = sqlx.MustOpen("mysql", sqlConfig.FormatDSN())
-	DB.SetMaxIdleConns(10)
-	DB.SetMaxIdleConns(100)
-	DB.SetConnMaxLifetime(time.Minute)
+	DB = sqlx.MustOpen("sqlite", config.Database)
 
+	// create the tables if they don't exist
+	if dbSetupInstructions, err := os.ReadFile("setup.sql"); err != nil {
+		panic("can't read database-setup")
+	} else {
+		DB.MustExec(string(dbSetupInstructions))
+
+		// take wether the admin-user is present as an indicator to a new instance
+		var admin struct {
+			Admin bool `db:"admin"`
+		}
+		if err := DB.QueryRowx("SELECT admin FROM USERS WHERE name = 'admin'").StructScan(&admin); err != nil {
+			// if the error isn't because there was no result, it's a real one
+			if err != sql.ErrNoRows {
+				panic(fmt.Errorf("can't query for the admin-user: %v", err))
+			} else {
+				// setup everything
+				setup()
+				fmt.Println("setup completed")
+
+				// reload the config
+				_config.LoadConfig()
+			}
+		}
+	}
 }