Restructure DB connecting a bit

.env.example

@@ -1,2 +1,6 @@
 BOT_TOKEN=123456789:abcdefghijklmnopqrstuvxwyz
-MYSQL_URL=user:password@tcp(127.0.0.1:3306)/database_name?charset=utf8mb4&parseTime=True&loc=Local
+MYSQL_HOST=127.0.0.1
+MYSQL_PORT=3306
+MYSQL_USER=myuser
+MYSQL_PASSWORD=mypassword
+MYSQL_DB=mydb

handler/funcs.go

@@ -1,9 +1,10 @@
 package handler
 
 import (
-	"gopkg.in/telebot.v3"
 	"log"
 	"os"
+
+	"gopkg.in/telebot.v3"
 )
 
 var defaultSendOptions = &telebot.SendOptions{
@@ -13,7 +14,7 @@ var defaultSendOptions = &telebot.SendOptions{
 }
 
 func isDebugMode() bool {
-	_, exists := os.LookupEnv("TAGESSCHAU_EILBOT_DEBUG")
+	_, exists := os.LookupEnv("DEBUG")
 	return exists
 }
 

main.go

@@ -1,28 +1,25 @@
 package main
 
 import (
-	"github.com/Brawl345/tagesschau-eilbot/handler"
-	"github.com/Brawl345/tagesschau-eilbot/storage"
-	_ "github.com/joho/godotenv/autoload"
 	"log"
 	"os"
 	"os/signal"
 	"syscall"
 	"time"
 
+	"github.com/Brawl345/tagesschau-eilbot/handler"
+	"github.com/Brawl345/tagesschau-eilbot/storage"
+	_ "github.com/joho/godotenv/autoload"
+
 	"gopkg.in/telebot.v3"
 )
 
 func main() {
-	db, err := storage.Open(os.Getenv("TAGESSCHAU_EILBOT_MYSQL_URL"))
+	db, err := storage.Connect()
 	if err != nil {
 		log.Fatal(err)
 	}
 
-	if err := db.Ping(); err != nil {
-		log.Fatal(err)
-	}
-
 	log.Println("Database connection established")
 
 	n, err := db.Migrate()
@@ -34,7 +31,7 @@ func main() {
 	}
 
 	pref := telebot.Settings{
-		Token:  os.Getenv("TAGESSCHAU_EILBOT_TOKEN"),
+		Token:  os.Getenv("BOT_TOKEN"),
 		Poller: &telebot.LongPoller{Timeout: 10 * time.Second},
 	}
 

storage/storage.go

@@ -2,10 +2,14 @@ package storage
 
 import (
 	"embed"
+	"fmt"
+	"os"
+	"strings"
+	"time"
+
 	_ "github.com/go-sql-driver/mysql"
 	"github.com/jmoiron/sqlx"
 	migrate "github.com/rubenv/sql-migrate"
-	"time"
 )
 
 //go:embed migrations/*
@@ -17,20 +21,35 @@ type DB struct {
 	System      SystemStorage
 }
 
-func Open(url string) (*DB, error) {
-	db, err := sqlx.Open("mysql", url)
+func Connect() (*DB, error) {
+	host := strings.TrimSpace(os.Getenv("MYSQL_HOST"))
+	port := strings.TrimSpace(os.Getenv("MYSQL_PORT"))
+	user := strings.TrimSpace(os.Getenv("MYSQL_USER"))
+	password := strings.TrimSpace(os.Getenv("MYSQL_PASSWORD"))
+	db := strings.TrimSpace(os.Getenv("MYSQL_DB"))
+
+	connectionString := fmt.Sprintf(
+		"%s:%s@tcp(%s:%s)/%s?charset=utf8mb4&parseTime=True&loc=Local",
+		user,
+		password,
+		host,
+		port,
+		db,
+	)
+
+	conn, err := sqlx.Connect("mysql", connectionString)
 	if err != nil {
 		return nil, err
 	}
 
-	db.SetMaxIdleConns(100)
-	db.SetMaxOpenConns(100)
-	db.SetConnMaxIdleTime(3 * time.Minute)
+	conn.SetMaxIdleConns(100)
+	conn.SetMaxOpenConns(100)
+	conn.SetConnMaxIdleTime(3 * time.Minute)
 
 	return &DB{
-		DB:          db,
-		Subscribers: &Subscribers{db},
-		System:      &System{db},
+		DB:          conn,
+		Subscribers: &Subscribers{DB: conn},
+		System:      &System{DB: conn},
 	}, nil
 }