add hemtt support, major refactor

- no longer supports server events
- can now more easily build using hemtt
- extension vastly improved in both structure and functionality
- tested on listen server
- includes schema change

extension/AttendanceTracker/internal/db/db.go

@@ -0,0 +1,62 @@
+package db
+
+import (
+	"fmt"
+
+	"github.com/indig0fox/a3go/a3interface"
+	"gorm.io/driver/mysql"
+	"gorm.io/gorm"
+)
+
+var db *gorm.DB
+var config ConfigStruct
+
+type ConfigStruct struct {
+	MySQLHost     string `json:"mysqlHost"`
+	MySQLPort     int    `json:"mysqlPort"`
+	MySQLUser     string `json:"mysqlUser"`
+	MySQLPassword string `json:"mysqlPassword"`
+	MySQLDatabase string `json:"mysqlDatabase"`
+}
+
+func SetConfig(c ConfigStruct) {
+	config = c
+}
+
+func Client() *gorm.DB {
+	return db
+}
+
+func Connect() error {
+
+	// connect to database
+	var err error
+	dsn := fmt.Sprintf(
+		"%s:%s@tcp(%s:%d)/%s?charset=utf8mb4&parseTime=True",
+		config.MySQLUser,
+		config.MySQLPassword,
+		config.MySQLHost,
+		config.MySQLPort,
+		config.MySQLDatabase,
+	)
+
+	db, err = gorm.Open(mysql.Open(dsn), &gorm.Config{})
+	if err != nil {
+		return err
+	}
+
+	// try ping
+	sqlDB, err := db.DB()
+	if err != nil {
+		return err
+	}
+	err = sqlDB.Ping()
+	if err != nil {
+		return err
+	}
+
+	a3interface.WriteArmaCallback("connectDB", `["Database connected", "INFO"]`)
+	a3interface.WriteArmaCallback("connectDB", `["SUCCESS", "INFO"]`)
+
+	return nil
+}