feat: add config module

internal/app/config/main.go

@@ -0,0 +1,49 @@
+package config
+
+import (
+	"os"
+
+	"github.com/joho/godotenv"
+	log "github.com/sirupsen/logrus"
+)
+
+type dbConfig struct {
+	Url string
+}
+
+type appConfig struct {
+	FromDb dbConfig
+	ToDb   dbConfig
+}
+
+func loadEnv() {
+	err := godotenv.Load()
+	if err != nil {
+		log.Warn("Warning: could not load .env file")
+	}
+}
+
+func getAppConfig() appConfig {
+	loadEnv()
+
+	fromDbUrl := os.Getenv("PG_FROM_DB_URL")
+	if fromDbUrl == "" {
+		log.Fatal("PG_FROM_DB_URL environment variable not set")
+	}
+
+	toDbUrl := os.Getenv("PG_TO_DB_URL")
+	if toDbUrl == "" {
+		log.Fatal("PG_TO_DB_URL environment variable not set")
+	}
+
+	return appConfig{
+		FromDb: dbConfig{
+			Url: fromDbUrl,
+		},
+		ToDb: dbConfig{
+			Url: toDbUrl,
+		},
+	}
+}
+
+var App appConfig = getAppConfig()